Pontiac 400 timing specs. Feb 20, 2015 · Pontiac’s rocker contained a 1.

Pontiac 400 timing specs. Either position has no effect on camshaft timing and positions the camshaft in same relation to the crankshaft. Here are the specs I've gathered for the 3 pontiac 400/4brl engine available in a man trans car in 1970, GTO or Firebird. 045" to keep the ignition parts alive longer. 1 day ago · PONTIAC TORQUE/ENGINE SPECIFICATIONS. I don´t know what you guys have in your fuel, but i have found my 462 w/1971 #96 heads and 744 cam works best with the 1970 455 timing curve, 9-10 Feb 14, 2016 · I put together the specs on the factory-installed GTO camshafts for the 389/400/455. Let the engine idle then check the initial timing. The recommended engine oil for this engine is a high-quality, multi-viscosity oil with a viscosity rating of 10W-30. However, the camshaft gear timing dot can be installed at 6 or 12 o’clock. Block is code X7 and has 6X heads. May 27, 2019 · Compression, aluminum heads vs cast iron, weight of the car, rear gearing, auto vs stick, amount of fueling all factors that will determine the timing curve. If you scribe or make a mark 2 1/8” around from Zero on the balancer that will be 36 degrees. 400-inch valve lift when combined with a lobe lift that’s slightly greater than . 5-7 10 @ 13-14 VC1842 AS4 1976 350 Olds Cutlass 5-7 12 @ 13-15 VC1844 AR16 3-5 12 @ 13. 2 cui, advertised power: 253. It is right on at 6 degrees BTDC. May 11, 2019 · Cam at 6:00 and crank at 12:00, dots close together is TDC #1 overlap/ TDC #6 firing. Just above the oil pan and to the left of the timing cover. 5 kW / 340 hp / 345 PS ( SAE ), torque: 590 Nm / 435 lb-ft, more data: 1968 Pontiac Firebird Sport Coupe 400 HO Ram Air II Turbo Hydra-Matic (aut. Total maximum spark lead in a naturally aspirated Pontiac V-8 is generally between 30 and 40 degrees, and that can vary with combustion chamber type, compression ratio, and fuel octane. Mar 18, 2024 · 1972 Pontiac 400 Engine Specs. If you rotate crankshaft 1 rotation to put crank dot at 12:00 or cam dot also at 12:00, then that would be TDC #1 Firing/TDC #6 Overlap. Apr 29, 2021 · Here is what the shop said after I told them Pontiac's generally like 36 degrees of total timing at 2800ish RPM: "Ryan, the car is at 11 degree advance at idle, and 28 degrees at 2,200 RPM with no vacuum advance. engine, these engineers knew that the Pontiac 400-cid engine would also soon be phased out. The 1974 Pontiac 400 engine was a V8 engine that belonged to the Pontiac V8 family. For engine manufactures from 1955 to early 1967. and there are separate specs for vacuum advance Feb 24, 2011 · I have a Pontiac 400 bored . Hello All: A funny thing happened to my GTO. 1:1. The Pontiac Firebird 400 weighs a quoted 1543 kg at the kerb. 270 inch. Sales and the new engine’s performance failed miserably and the 301 was no longer offered by Pontiac after Nov 24, 2017 · I checked the timing per factory instructions, I. Feb 12, 2008 · 1976 350/400/455 Pontiac 4-bbl VC1839 AR13 4-6 12 @ 11-13 VC1840 AR14 1975-76 350/400/455 Pontiac Firebird 6-8 10 @ 9-12 VC1841 AS3 1975-76 500 Cadillac Calif. Actual compression ratio was measured at 7. 6 liters (400 cubic inches) and was widely used in various Pontiac models during that era. They go from mild to radical with the "068" often suggested as a good solid performance street cam in a 389/400 that doesn't get into street/strip territory. This power is supplied to the wheels through a 3 speed manual gearbox. Mar 24, 2008 · more timing, allows the the engine to run with less throttle blade opening. Aug 13, 2023 · In addition, even within Pontiac, the 455 had some serious competition. Cam was a Pontiac 066 and measured in at 197/206 - 112, as specs call for. Mar 19, 2024 · 6. Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. 060" gap. One of the key elements that made this car so legendary was its powerful 400 cubic inch V8 engine. Full specs Mar 18, 2024 · 1975 Pontiac 400 Engine Specs Engine Configuration. Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am. disconnect vacuum and 500 RPM. This is strange????? It was at 185 degrees with base timing at 13 degrees. Any gasoline engine runs better with as much advance as it can handle, within the constraints of fuel quality, and ease of starting, (which isn't an issue with vacuum advance). Oct 25, 2012 · I have read up on the topic of engine vacuum and idle speed on several Pontiac forums and have a few questions regarding timing and engine vacuum on a 67 400 with an aftermarket cam: Comp Cams 51-224-4 Extreme Energy - Hydraulic Flat Tappet - 1,800-6,000 rpm range - 230/236 duration @ . Mar 18, 2024 · 1973 Pontiac 400 Engine Specs. Aug 12, 2008 · There were numbers for different flavors of Pontiac ignitions, but. Even though production of the 400 had ceased, 1979 Pontiac models still featured the 400 engine due to large stockpiles left over from the previous year. Running 93 octane fuel. Edelbrock Victor 850 base with Sep 30, 2011 · Personally, I always loved "vacuum" (not ported) advance on a street driven car. Jun 14, 2016 · Pontiac 400 Engine Build - Pump Gas Pounder Timing Chain. It develops 330 bhp (335 PS/246 kW) of power at 4800 rpm, and maximum torque of 583 N·m (430 lb·ft/59. 6L V8 Camshaft; Pontiac 400 Long Tube Headers 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. They are often referenced by their last part number digits, ie "066," "067," "068," etc. I took the distribuotr out ot replace the o-ring gasket and got the timing screwed up. The only way to get it to start is if I set the timing at roughly 35 degrees what I believe is before top dead center timing mark on crank is under timing marks on engine. Mar 19, 2024 · 1976 Pontiac 400 Engine Specs Engine Configuration. Significantly increasing the compression ratio, such as that required for competition engines, raises the amount of cylinder pressure the starter must work against when attempting to fire the engine. Pontiac Firing Order Pontiac V8. Does that seem like an accurate reading or am I doing something wrong? Mar 18, 2024 · 1974 Pontiac 400 Engine Specs Engine Configuration. I dont know the cam specs, but it i know it a fairly big hydraulic. Mar 23, 2018 · An original Pontiac HEI can have anything between 10° to 26° total centrifugal advance at about 4000 give or take 400 rpm´s. The 1973 Pontiac 400 engine is a legendary powerhouse that was known for its impressive performance and durability. 060" gap was later lowered to . The 1975 Pontiac 400 engine was a V8 engine that belonged to the Pontiac V8 family. IGNITION . Like all PONTIAC engines since 1955, the firing order sets is: 1-8-4-3-6-5-7-2, all by turning it counterclockwise. put distributor in at this point with the rotor pointed at #6 post on the cap. Car does not have power steering or power brakes. I guess that would be the Initial Timing. typically a cam that size in a 455 will need 20 degree initial timing and 40 total. 2437" Fuel Pump to Timing Cover 20/25 20/25 converter to flywheel Turbo 400 35 35 dry Mar 17, 2024 · 1968 Pontiac GTO 400 Engine Specs. Home » ; Resources » ; The Pontiac Engine; The Pontiac Engine. In this article, we will delve into the engine specifications, configuration, and oil service intervals of this iconic engine. Some of the most common questions regard cooling the Pontiac engines and water pumps. . After the 1976 model year, the 400-cid engines would be produced only two more model years Beginning with the 1977 model year, Pontiac offered a new high-performance engine option for the 400-cid engines called T/A 6. The ignition is a mallory. its a Pontiac 400 6x4 heads and I believe a summit 2801 cam. The Ram Air III 400 pumped out 366 horsepower and the Ram Air IV 400 made 370 horsepower — the same as the 455. It was up like 15 degrees. Mar 17, 2024 · Regular maintenance and adherence to the manufacturer’s recommendations will help ensure the longevity and performance of the 1967 Pontiac 400 engine. 5-1 compression ratio, Edelbrock 650 performer carburetor, Edelbrock performer series intake, Edelbrock performer RPM camshaft, Edelbrock valve spings, Edelbrock timing chain, Comp Cams roller tip rockers. To ensure optimal performance and longevity of the 1978 Pontiac 400 engine, it is crucial to use the correct engine oil. 6 L). Engines idle smoother, get better fuel economy, and better throttle response, and under WOT, the vacuum advance all goes away. The engine had a cast-iron block and cylinder heads, providing durability and strength. There is still a timing anomoly that I don't understand. Dec 6, 2007 · I know the subject of ignition timing has been discussed endlessly around here, so here's another: The 400 in my TA runs 9:1 CR and has always required 93 octane pump gas in order avoid pinging. The sequence works on all V8's with the Pontiac firing order--Firing Order The firing order on all Pontiac motors is 1-8-4-3-6-5-7-2. when i bought it it had a performer rpm and a holley dual feed with no choke. _____ Mar 16, 2010 · The 400 automatics perform well with the 068 and 1. Has this motor ever had its timing chain replaced? Feb 26, 2018 · On Pontiacs, the #1 cylinder is on the driver’s side, which is furthest from the timing marks on the damper. The 1976 Pontiac 400 engine was a V8 engine that was part of Pontiac’s long-standing tradition of producing powerful and reliable engines. Warning!!! If you are using ARP fasteners, you must use ARP specs and specified lube. 48:1 on average. I reconnect the vacuum hose and the timing jumps immediately to around 22 - 24 BTDC at idle (estimate based on progression around pulley from timing marks). A common mistake is to use the #2 cylinder on the passenger side because it is on the same side as the timing marks. Let’s dive into the engine specifications of the 1968 Pontiac GTO 400. 75in stroke, 67cc 1969 ram air heads, 10. 400 with stock cam and HEI. May 10, 2020 · Optimize timing curve Pontiac - Street. 8:1. Its specifications and configuration made it a popular choice Apr 20, 2010 · If it has an HEI distributor disconnect the vacuum advance, hook up your timing light, watch the timing marks while you increase the rpm, until the timing stops advancing. Feb 20, 2015 · As piston speed increases, spark timing must occur earlier in the rotation cycle and a mechanical assembly within the distributor increases spark timing. My new HEI distributor is here and I am stupid enough to try to swap them out. I graphed them all in Excel (timing° vs. In 1980, Pontiac decided to use the Pontiac 301, 4. Jul 20, 2016 · I picked out about 8 of the best Pontiac engines like the '71-'72 455HO, '73-'74 SD455, '69 - '70 RAIV, and some hot D-port engines like the RAIII (HO) 400 of the late 60's, some older 421 stuff, and a D -port 455HO from 1970 put in GTO's. Nov 26, 2005 · The car has 400 with 3000 stall. Jun 12, 2015 · need a little help with tuning a 400 in my daughters trans am. the msd with no vacuum advance was changed to a summit hei with adjustable advance. The . 5 kgm) at 3300 rpm. 035: 0. The 1972 Pontiac 400 engine is a classic powerhouse that was known for its performance and durability. Totally depends on the factory application-# what´s inside yours. 5-15. the carb was rebuilt. 9 V8 engine to replace the 400. of vaccum. Sep 25, 2010 · It's a pontiac 400, with a cam (unknown specs). 491 exhaust Feb 21, 2015 · A stock Pontiac starter is designed to turn over a production-type Pontiac V-8 that operates on pump gas and uses original equipment. Here are our recommended Pontiac 6. Just finished assembling the engine. RPM for mechanical, and timing° vs. Timing Belt Replacement: The 1977 Pontiac 400 engine does not have a timing belt. 050" lift (274/286 advertised) - 0. The VIN is 6 a digit number equaling the last 6 digits of the vehicle’s VIN. Mar 21, 2024 · The Pontiac 400 engine is a legendary powerhouse that requires proper torque specifications and regular maintenance to perform at its best. i changed the intake to a 72 cast iron intake and a quadrajet. May 21, 2011 · Engine timing, 1979, 400, manual. i also had to use stock We recently disassembled an excellent bone stock 1975 Pontiac 400 from a Trans-Am. 265, 301, 307*, 326, 350, 389, 400, 421, 428, 455 Mar 28, 2019 · Always position the TDC timing dot on the crankshaft gear at the 12-o’clock position during timing set installation. BTW, 6X heads were used on Trans Ams along with any other Pontiac car of the period equipped with a 350 or 400 engine. 6L V8 engine upgrades: Pontiac 400 Edelbrock Performer RPM Intake; Increased Pontiac 400 Cylinder Bore ; More aggressive 6. Rollmaster double-roller. 65 roller rockers, edelbrock 800 cfm carb, and hei distributor. This engine was widely used in various Pontiac models during the 1970s, including the Firebird, Grand Prix, and GTO. It does, however, affect ignition timing. Jun 9, 2018 · Though there were many iterations of the Pontiac 400 V8 found in many different Pontiac cars from 1967 to 1979, the 1969-1970 Ram Air III 400 was one of Pontiac’s best high performance V8s. It featured a displacement of 400 cubic inches, which is equivalent to 6. Jun 22, 2006 · On a stock 400 set the initial at 12 degrees. 040 over with a 3. No. I’ve got a ‘77 trans am with a pontiac 400 motor with such low compression i have 44degree’s of total timing and it could probably take a little more. 12 inches by 3. Sales and the new engine’s performance failed miserably and the 301 was no longer offered by Pontiac after May 4, 2023 · For the high-performance Pontiac 400 V8 variants, an upgraded carburetor, and more aggressive cam would likely yield the best results. Make sure you are using the #1 cylinder to time your 400. 6. Jul 12, 2009 · I have read a few old posts regarding ignition timing, is the correct timing 12 deg BTDC, with the vacuum advance hose plugged? 1970 Pontiac 400, automatic, aftermarket HEI distributor. The Pontiac 400 V8, which they had introduced back in 1967 inside the GTO, was still around and made almost the same power. plus your q-jet will need to be re-calibrated for a lower idle vacuum. 5:1 rockers. 6 liters. 97 square. Feb 20, 2015 · Pontiac’s rocker contained a 1. Carb. Connect the vacuum advance to manifold vacuum and see how much the timing Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. Let’s take a closer look at its specifications and what made it such a popular choice among car enthusiasts. I am not sure why it was set so high, but with vacuum advance disconnected, I suspect that it was to compensate for that. Final torque ratings may vary and need to be determined based on application and parts used. I will dig out an issue of High Performance Pontiac that I got a few months ago as they had a great article on cuting marks in the balancer for figuring total timing. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400 cu in (6. Apr 19, 2018 · An important point to remember in adjusting valve lash is that the adjustment must be performed while the lifter is sitting on the base circle of the cam lobe you will adjust. so once the ignition is turned off there will be no extra fuel in the cylinders to burn. Let’s take a closer look at its specifications and configuration. gasoline (petrol) engine with displacement: 6558 cm3 / 400. It featured a displacement of 6. 1050 Holley Dominator. Pontiac Timing Cover Identification How to identify Pontiac Timing Covers from 1964-65, 1966-67, 1968, and 1969 and up Pontiac Water pumps Here at Butler Performance, we get a lot of tech questions. The book states the timing to be 18 degrees BTDC, which seems quite a bit to me. May 18, 2018 · 1968 GTO intial, and Total timing. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0. Pontiac Engine Torque Specs These are general guidelines. Below is the technique I use. Both the 400 and 455 respond well to valve lifts of up to about . Even with the original stretched timing chain, cam was found positioned at a 107 degree intake lobe centerline, also as specs call for. I set it back to 15 degrees base, and it now runs at 170 degrees going 40 mph. Oct 15, 2023 · This is the timing from a late 60s high compression 4 bbl 400 motor. It had a displacement of 400 cubic inches or 6. Detailed Engine Specifications Sep 10, 2008 · OK, that would make a little more sense. 60 over ported and polished 6x-4 heads, edelbrock performer rpm intake and cam, 1. Instead, it utilizes a timing chain, which does not require regular replacement unless there is a specific issue or damage. The engine had a bore and stroke of 4. 75 inches View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. 2. vacuum for vacuum advance). This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421, 428, 455 cu in. Pontiac Deck Height = 10. Jets. The initial timing is at the crank and the advance timing is in the distributor which doubled to match crank rotations. Induction. Mar 20, 2012 · Factory specs were 18 degrees BTDC and . With an idle at about 800-820rpm, and using a timing light at the zero mark, I'm getting a reading of 39. 5 VC1845 AS5 1978-79 425 Cadillac w/F. Mar 24, 2012 · We just finished up the dyno testing of a mildly-built Pontiac 400, and the results follow… The engine was a 1976 Firebird 400 – the mighty 185-horse with an actual compression ratio of 7. By following the recommended torque specs and service intervals, you can ensure the longevity and optimal performance of your Pontiac 400 engine. 016: 30: 6° Oct 22, 2017 · Timing a Pontiac 400 on a 1978 Trans Am. The 1968 Pontiac GTO is an iconic muscle car that left a lasting impression on automotive enthusiasts. May 25, 2011 · OK, so I bought a timing light and was able to check the timing, pretty much confirming that the timing at idle is about 30 degrees or so. Intake Manifold. Jun 7, 2016 · Engine specs: 67 Pontiac 400 bored . 460″. You may end up with 36 to 40 degrees total timing before you have timing where the engine likes it best. 488 intake/0. Hold that rpm and set the timing at 35* BTDC. PONTIAC 1965-75Tune-up Specifications May 12, 2012 · The 1964-1974 Pontiac Tempest, Lemans & GTO Need input on setting the timing. 5:1 ratio, which allowed slightly more than . they should all be within a degree or two of timing and an inch or two. 34° seems to be where we are ending up for the new Edelbrock D-port heads from the only two we've played with in the car club - and not because higher compression engines like slower curves but because the specific combustion chamber design and available fuel demand it. In conclusion, the 1967 Pontiac 400 engine was a formidable V8 powerplant that provided impressive performance and reliability. The Pontiac specifications for both duration and lobe placement should be used as the starting point for cam selections in both street and street/strip cars. Unfortunately for the Ram Air III, it played second fiddle to the 1969-1970 Ram Air IV 400 which got most of the limelight and press attention during the Mar 19, 2024 · 1979 Pontiac 400 Engine Specs Engine Configuration. 4-6 14 @ 14-16 1977 425 Cadillac Sep 23, 2006 · Torque Specs Application: Method: Torque: Increment: Lubrication: Cylinder Head to Block (with Grease Under Head of Bolt) Bolt: 95 lb/ft *NOTE 1 25 lb/ft: Oil: Main Caps 1-4 to Block Mar 19, 2024 · Engine Oil Specs. I have carefully measured several well-used originals and even an NOS unit and found the actual ratio closer to 1. The 1979 Pontiac 400 engine was a powerful V8 engine that was widely used in various Pontiac models during that era. Note that the cylinder number 1 is the next driver in front of the engine (the same location on all V-engines) or just the first behind the power steering pump. I changed the base timing back to 13 degrees, and the Engine got hotter. I. 3) Horsepower/Torque Curve Even though production of the 400 had ceased, 1979 Pontiac models still featured the 400 engine due to large stockpiles left over from the previous year. E. nvvmsh aimzhv lgrbp owcv pttncqt bwh stzolh gpnob xrlqsil muupw