Gzig, 30 cfm from a set of these types of heads isn’t what I’d call “Not far behind.” Also a lot will be combination dependent as well as the engines CID. In the laymen’s EZ math, it could be a 60hp difference. Nevermind when your going to push it a little hard.
Well, compared to my stock 2.02 J-heads they aren't far behind. My build is going to to be street and road course oriented so I think I'll have to go about it differently from someone that is focused on quarter mile games and that 30 cfm may not manifest itself as much. The biggest flowing head my not be in my best interest, though it should ultimately make more peak power. I still need to decide if I stay with the stock crank or go with a 4" arm.
Hello.... .020 over and not straight to .030 as well.
Until the port takes over (upper rpm range) it’ll be close to the same down low. (From the start of the power point in the curve until somewhere around the 5252 rpm mark. Depends on the combo.
I do the same out here in the west, in a Miata. Completely stock drivetrain, good brakes, coil overs, and good tires. At COTA on the back straight it seems like you could eat lunch after shifting to 5th before you see a brake marker. We ran up to about 127mph there. In the Porsche coming into the braking zone we saw 151.
