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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.


 


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Numbers: 550 torque @ 5800rpm 535hp @ 4000rpm For those of you paying attention and noticed the numbers aren't the same on the screenshot, its because we made another few runs, but didn't tape them. We'll upload a pic soon. QMP Racing is located in Chatsworth, CA Check out our website: www.qmpracing.com Like us: facebook.com/qmpracing Tags: qmp racing quarter mile race car engine motor custom high performance chatsworth California hp horse power torque trq Dyno rpm turbo drag Exhaust run Boost psi dragster raceway nitro Nitrous super Supercharger muscle burnout idle motorsports Mustang cam Ford hydraulic Street pontiac Cars Supra "Drag Racing" Pontiac Shelby Dodge Twin Stock Mazda Ls1 Motorcycle Bike





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My Pontiac 455 fresh build. Pro Gram Billet 4 bolt mains, Eagle H Beam Rods, 6095 Lunati Voodoo Cam Valve Lift .527 INT 548 EXH; Duration 284 INT 292 EXH., Pro Form 950 CFM Carb, 1971 Super Duty Round Port HO "197" castings #481768; Fully Ported; 2.11/1.77 valves; Milled .055; 103 cc's; Lazer Valve Springs H-O Racing Enterprises) 1.770-1.785 installed height; 7/16 screw in studs; 11/32 pushrods; Pushrod Guide plate holes elongated for clearance; 1.65 Harlan Sharp Roller Rockers; ARP head Stud Kit., Doug Nash Warrior Intake port matched, JE forged pistons, 10.3:1 compression. 500HP 500 Ft pounds of torque. Built by Blackshear Racing, Brookfield, Oh. Dynoed at Tubs, Austintown, Oh.





Pontiac 400/461 Stroker Cam Break-In
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