Motion firebird

[RichSchmidt]

10.49 in good air,high 10.50's all the time. My friend raced Pro Stock and Modified production back in the early 70's and I learned a lot about how his old cars ran. It is a 2 bolt main 427 bored to 439,stock GM crank,manley .250" longer rods,JE 43cc dome pistons(11.2:1 actual compression) the GM L88 replacement heads are out of the box with a bowl blend,and have 2.19/1.88 3/8" stem valves,the cam is actually an old GM #282 grind. Back in the late 60's GM designed a cam for circle track racing 396's that had rectangluar port heads. They took the intake lobe off the L88 cam and put it on both the intake and exhaust with a 106 lobe seperation angle and 106 intake centerline. It put a lot of mid range power into the small engines with the big heads. My friend used a few different versions of the GM cams in his old cars and we decided to try this one in my car after I wiped out a .630" lift race cam. The 1150 Dominator actually started life as an old 6214 IR carb from an old pro stock engine too.
The rest of the combo is a 2 speed powerglide with a super hard hitting 5000 stall convertor,and 4.88 gears with 30" tall tires. Simple as pie and reliable to a fault. I had the exact same combination except for a .600" lift cam in my car for about 700 runs with nothing but oil changes. I even shot it with nitrous and ran well into the 9's a few times. I did nothing to it but changed the oil and when the rods came out the side I just built a new shortblock,even reusing 6 of the pistons. This one only has about 150 runs on it,so it's hardly broken in. Its the right tool for a 7500 rpm job.

One of the coolest things is that when I drop the pipes and drive it to the line,you are actually hearing exactly what a 1970 Pro Stock car sounded like back in the day,7000 rpm burnouts and all.