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Pontiac 400 idling on dyno right after break in session

A Pontiac 400 bored .030" over so now a 406 with comp cams extreme energy hydraulic cam and lifters, roller timing chain and roller rockers. Lightened and balanced Scat crank. Ignition upgraded to MSD HEI with Accel 8.8 mm sprial core wires. 6X-4 heads ported and port matched to ported factory dual plane intake manifold. Factory 750 CFM Quadrajet reworked by Cliff Ruggles performance.


 


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Pontiac Engine Break Down 301 to 455
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Sehr Performance Machine / Randi's 400 Pontiac
Randi came to us with a 400 Pontiac project for his 1968 Firebird. He didn't want to go crazy on the build but he wanted something that would give him performance that is better than original. With that goal in mind Scott did some custom porting on his heads, upgraded his valve train and went with a Custom COMP cam and lifters and aluminum roller rockers. We maintained his complete original rotating assembly but had to re-balance his crankshaft, it had been poorly balanced sometime in the past and was out by 127 grams on one end and 181 grams on the other. A single plane intake with a 780 Quick Fuel carb got it breathing and the fire is lit with a Flamethrower ignition package. Custom cut and fitted 8mm plug wires are standard equipment here at Sehr. Headman custom coated headers will be added at installation time. The results were a satisfying 543.5 Hp @ 5500rpm and torque reading of 519.8 @ 5400rpm. Corrected to sea level the numbers are 577 Hp and 551 Tq with nearly 400 lb of torque at 3500rpm.





Pontiac Banshee A Longer Look
The Banshee was a vision for what the Firebird could become. Of course, this concept car could never be built exactly, too low on the road and it wouldn't pass the safety and crash tests, but it was exciting. It demonstrated that the problem with GM cars didn't sit on the designers' shoulders. They were more than capable of dreaming up engaging and fun vehicles that would set imaginations on fire.





1970 Pontiac Grand Prix 400 Model J Engine Bog
My 1970 Pontiac Grand Prix runs, but hesitates (bogs) on quick acceleration. When accelerating slowly this problem does not occur, only when doing so quickly. It has new high quality Bosch spark plugs, and a replacement carburetor (Rochester 4 barrel quadrajet), everything else is stock. It is running on premium fuel with lead substitute. If anyone knows what I can do to fix the bog, please comment or message me, thanks.





1967 Tempest new camshaft Ultra Dyne 220/226 @ .050 in Pontiac 400
Traded my friend Robert for this camshaft. Came already broken in with a matched set of lifters. I swapped it out over the last month or so. I still have to install the temp gauge in the car, so I am not running it that long yet. Put around 2 miles on it. PULLS!!!! Hard!!! I have to find the coil bind on the springs. might have just increased redline!!!





Pontiac 400/461 Stroker Dyno Run
Pontiac 400/461 Stroker Dyno Run with Spintech X-Pipe and Spintech Sportsman Street Mufflers. 370 HP & 510 Ft Lbs of Torque





pontiac 400 .060 over
Built to the hilt 400





First start after rebuild of my pontiac 400 engine
pontiac 400 engine rebuild , first start after a lot of work ( v8 domination tholen ) with D-Port Ram Air Style Factory Headers and 2.5" Goerlich Xcelerator mufflers from Ram Air Restoration





Pontiac 400 first start up
First start up of my bored out 400 from 1979 trans am. Now a 406 with comp cams extreme energy hydraulic cam and lifters, roller timing chain and roller rockers. Lightened and balanced Scat crank. Ignition upgraded to MSD HEI with Accel 8.8 mm sprial core wires. 6X-4 heads ported and port matched to ported factory dual plane intake manifold. Factory 750 CFM Quadrajet reworked by Cliff Ruggles performance. Dyno pull to follow





Pontiac 400 Dyno Run
Pontiac 400 Dyno Run, Built by Flash Auto & Speed Shop, 400 Pontiac





1956 Pontiac Star Chief Low Mileage Survivor 317 V8 - Gateway Classic Cars
I thought you'd like a look at this very original 1956 Pontiac Star Chief. This amazing survivor has only 74,xxx original miles on the odometer. It's powered by the factory 317 V8, backed by an automatic trans. It has all original interior and even the factory Air Conditioning. You won't find too many out there like this anymore. It has a cool patina to it, that can only be built up over decades of use. If it were me, I would leave this car as it is and just have fun cruising it. I hope you find it interesting....thanks for watching! Filmed at Gateway Classic Cars near St Louis, MO www.GatewayClassicCars.com The first background track used in this video was Open Road by Jason Shaw. Available under the Creative Commons Attribution 3.0 Unported license. Download: http://audionautix.audionautixcom.netdna-cdn.com/Music/OpenRoad.mp3 The background music track is Whiskey on the Mississippi by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link:http://music.incompetech.com/royaltyfree2/Whiskey%20on%20the%20Mississ ippi.mp3 MacLeod's description: Genre: Blues Length: 3:15 Instruments: Guitar, Bass, Kit, Organ, EP Tempo: 90 With a jumping bass and off-beat syncopation, this is straight from Memphis' Beale Street. The Hammond organ and electric guitar play together as longtime friends, while the melody changes hands from guitar to organ to electric piano. 011 ISRC: US-UAN-11-00709 Bouncy, Grooving 2010





1968 GTO Startup
First startup since engine rebuild Pontiac 400 Bored 90 over KB pistons RAM AIR III cam Edlebrock performer RPM heads Edlebrock highrise intake Edlebrock carb Dougs Headers





Pontiac Power pure and simple
Roller cam valve train in my 1968 lemans with shaker. Big Mutha Thumpr custom ground by Delta Cams Tacoma WA. Edelbrock heads ported with ferrea 6000 series stainless steel valves, comp cams 995-16 springs. Rocker stud girdles. Stainless steel rocker arms.





PONTIAC - stock Pontiac Super Duty 421v8/405hp vs stock Chevy 409v8/409hp on DYNO
WATCH THE VID TO SEE HOW CLOSE THEY Dyno TO THEIR FACTORY 405hp/409hp ratings. Growing up.....Pontiac/Oldsmobile old timers/EXPERTS who taught me most of what I know, often told me Chevy rated their horsepower in a more optimistic way than say Oldsmobile or Pontiac. I've even heard Pontiac rated/tested their engines in a 100 degree room, compared to Chevy in a 60 degree room. These Dyno results seem to reflect that some of what I heard was true. Both of these engines are great, but the results do seem to show that Pontiac was not rating their horsepower worrying if it would cause "songs to be written" about their engines .... like the great song "She's real fine my 409"--(Chevy).





New quadrajet set up
New air-gap manifold and custom/rebuilt q-jet. Sounds good but I still need to set the timing on the distributor and the carb is tuned already. Hope you like, nothing to fancy just a few revs and walk around...the Exhaust is true dual no x/h pipe and it has cherry bomb glasspacks(3 inch)




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