Thread: 400 engine combo what will it do?

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It sounds like a nicely matched combination for a street/strip car, but the cam and heads are a little big for my liking, especially if you have high gears in the rear. I think you would be happier with AFR's 195 heads which would give you better acceleration at lower rpms, and I would consider changing to a hydraulic cam around 230 degrees duration, something like a Magnum 280. But without knowing what type of pistons and the cc of the head chamber, it is hard to make a suggestion. Can you provide these details?

HI thanks for the reply yes the heads are a 65cc as for the pistons i dont know im afraid as just bought the engine complete and assembled.
the cam specs suggested it be run at 9.5 or higher so i assumed it is 9.5.
dont want to change the heads but if need be bfore the motor goes in i would consider a cam cahnge (more money )

hi thanks for the reply it has 65cc heads but i dont know the pistons in the cam specs it called for a ratio of 9.5 -1 so i ve assumed thats what it has
cheers

64cc head pistons 9.5 -1 did try to reply several times keeps dissapearing with some moderators message
cheers

64cc heads and 9.5:1 would mean dished pistons. You could switch out the cam to the one I run--a CompCams Magnum 280--which has an rpm range of 1800-6000 rpm. My 383 idles at 800 rpm and runs fine at lower rpms cruising around town. I use a 2500 stall converter which is a lot more street friendly than a 3000 stall converter. You should be able to sell the 210 heads fairly easily and I would recommend purchasing a set of AFR's new 195's which produce gobs of hp and torque. I had my engine dynoed, and it produced 450 hp an 468 ft. lbs. of torque. Those kind of numbers would make your Firebird a real street monster. With the 195 heads, you should be up closer to 475 hp and 500 ft. lbs of torque.