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 Motor Dyno Test
Engine package specs:
A seasoned 400 Pontiac block
Bored And Honed With Deck Plate
Mains Have Been Align Honed
Block Has Been Decked
Dura Bond Cam Bearings Installed
Brass Freeze Plug And Oil Galley Kit Installed
Block painted with 3 coats of high temp ceramic engine paint customers choice of color (have your engine custom painted to match your vehicle for an additional $300)
A Precision Ground Micro Polished Cast Iron Crankshaft
Clevite P Series Rod And Main Bearing
Eagle I-beam Connecting Rods w/ARP rod bolts
High Performance Pistons (Speed-Pro, Keith Black, SRP, Or Mahle)
Performance Rings Hand Filed To Match Application
New three piece true double roller timing set
Comp Cams Custom Ground High Performance Street Camshaft With A Muscle Car Chop
Set Of Tie-Bar Hydraulic Roller Lifters
Edelbrock Performance Aluminum Cylinder Heads
A Set Of High Performance Valve Springs And Retainers (To Match Camshaft)
7/16 Screw In Studs And Hardened Guide Plates
ARP Head Bolts
Manley Chrome Moly push rods
Scorpion aluminum roller rockers
Engine will be assembled with all new bolts
High volume oil pump and screen
Chrome oil pan
Chrome dip stick and tube
A new valley pan
Professional Products performance balancer
Fel-pro performance gaskets
The complete rotating assembly will be balanced
Edelbrock Performer RPM intake manifold
New chrome thermostat housing
Edelbrock carburetor w/ electric choke
New chrome air cleaner
MSD Pro-Billet distributor
MSD Blaster II coil and bracket
MSD 6AL Ignition Control Box
Auto-Lite spark plugs
Custom fit Taylor 8mm ignition wires (color of choice black, red, blue, yellow, green, orange no extra charge)
High flow water pump
Chrome valve covers
New chrome breather
Fel-Pro Performance Gaskets
Flex plate (for auto transmission)
Engines are photo documented during the building process so you can see the quality of parts and workmanship that goes into your engine
Each engine is tested, timing set and carburetor adjusted for optimum performance
We video tape your live run engine and send you a copy
389 Pontiac On Simtester
Watch John Edwards as he describes the Simtesting of a 389 Pontiac GTO engine at Costa Mesa R&D Automotive Machine. (949) 631-6376 Be sure to 'Click' and SUBSCRIBE.
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)
GTO First Start Up
Having a conversation with Darrel Arvizo, AKA "Slo-Moe", about his sweet GTO build and NOT getting a straight answer out of him on anything. I'm sure that engine puts out over 1000 horse power, who's he tryin to kid... LOL. Anyway, this is what I do know.... The chassis was built by Rob Lindsay at R.J. Fabrication, engine build by Rock & Roll Engineering and NHRA Super Stock Indy winner Bruce Fulper, body work done by Tony "Cricket Fingers" Griffin, C&R Radiator, APS-Racing carb spacer, CCP control arms, MSD Ignition and a lot of hard work by Slo Moe. Hurry up and Git-R-Done!
'68 Pontiac Firebird ...Pontiac 400...Built by Proformance Unlimited
http://www.customcrateengines.com/ Live run of a Pontiac 400 engine built by Proformance Unlimited...engine will be run in a '68 Pontiac Firebird
You can view this engine package along with available upgrades at the following link: http://www.proformanceunlimited.com/specs/pontiac_400_375tk.html
Our staff is available Monday-Friday 8am-5pm to answer any of your engine questions.
Pontiac 400 engine after rebuild
This is engine for my new 1977 Trans Am "Racer". Specs: '73 block with stock type crank (.010), pistons (.030) and rods,'69 heads No. 46 with no mods, stock '69 intake manifold, Summit headers, CompCam 268 HE complete camshaft with stronger valve springs and 1.6 roller rockers.
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