89 360

I agree, But I would leave the small valves as this will give more torque and low end power, and will be much more drivable. The bigger valves will kill the bottom end. The small valves are good to 6500rpms anyway, and this isn't really a street engine any more at these rpms. But I would gasket match and bowl blend them, then decide on which cam that you are going to use. Most cams that are streetable aren't going to be over .525 lift anyway, so putting the bigger valves in is a waste of time for low lifts as the bigger valves are ment for higher lifts. Smaller valves will out flow bigger valves at low lifts and be some what even in higher lifts. Also by keeping the smaller valves the efficentcy will be higher in the heads and make more power, fuel useage will be less too.
The exhaust flow should be in the 80-85% range from the factory so this shouldn't be a problem.


BJR Racing