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.
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 400 HO engine Dyno Test
This was a Dyno Run on
my Pontiac Firebird 400 HO engine build and tested by Terry Walter
Pontiac 400 block +.030
Pontiac #16 Heads 2.11/1.77
Forged Piston dished to bring CR down to 9.2
comp XE262H Cam
Cast Iron Intake
Pontiac Long Branch Headers
Pontiac 400 break in
Number matching engine. Pontiac 400 cid. Break in of camshaft.
Formula 1973 with non stock color ( it supposed to be Burma Brown)
Proformance Unlimited's Pontiac 400...Live engine run
Pontiac 400 built by Proformance Unlimited Live Run
You can view this engine package at the following link:
Pontiac 400 with 450 HP engine package with Edelbrock aluminum heads can be
custom designed to your specific needs. All engines can be custom painted
to match your vehicle at your request. We can outfit your engine with the
exclusive March Performance serpentine belt system. We can also assist you
in choosing the proper transmission and stall speed converter combination
for your vehicle and have it shipped directly to you as your performance
crate engine is being built.
1971 camaro with pontiac 400
1971 Camaro with
pontiac 400 engine. Comp roller cam, roller, lifters and scorpion roller
rockers. 5C heads ported and polished. TH400 with reverse manual valve
body. Holley 800cfm double pumper with aluminum intake. This is my newer
project that i recently redid the interior on. Leave comments or questions
Engine detail work
getting the motor all cleaned and freshened up before I get the car
primed/painted. I used the VHT 3000 degree header paint on the heads so it
won't cook off like the 500 degree pontiac blue. Once again, its just a
pontiac 350 studded 2 bolt mains, bored .060 over, forged KB pistons,
I-beam rods, Edelbrock performer cam. (.480/.480) 290 degree duration.
Q-Jet 800 cfm carb, 6X-4 heads, W-72 intake from a 400, all ARP bolts
holding it together internally.
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.
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