You’ve got questions. We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re helping a reader dial back the performance of his 454 for street use.

A.K. Moberly, MO

Q: I have a 1979 Camaro Z28 with a 1976 454 bored .030 inches over. The car has the following parts:

I am going to rebuild the engine and would like your opinion on any changes that would make the car more streetable. I know the current combo is not very streetable. I will not change the rear axle gears.

A: The least expensive way to detune your engine for the street is to use the 781 casting heads with TRW-L2399F domed pistons. This combination will give you around 9.3:1 compression. You should also go to a cam with a 235 duration @ .050-inch lift and get a torque converter that stalls around 2,500 rpm. These changes will make the Camaro more driveable and allow the use of pump gas.