Streetmaster to Airgap

lead69 said
So take a fully engineered race engine designed to be legal in a certain class and put mediocre stock heads on it in a fully engineered race car and make enough power to go high 11s. Take the same engine and put on some ootb speedmaster heads on it and drop a half second at least. Why use the stock heads?, only if you have to for class racing.
Poor flowing heads will make SOME power on a race engine, good flowing heads will make GOOD power on ANY engine.

Would you say that the engine and car you talk about in this post is a fully engineered race car and those heads where $2K-$5K?

lead69 said
Very cool thread,nice to see you document this for everyone.I ported a set of 318 heads for a street 360 build with awesome results.I ended up raising the legnth of the roof to the stock 360 port size and reworking the short turn and opening up the bowl to 90% of the intake.Also did the same as you on the exhaust side,original 1.78/1.5 but they did have a serdi valve job.The heads went on a stock 360 shortblock with an actual 8.6 compression,ported performer intake (360 size runners/mild plenum work) 600 holley ,cheap headers and an xe274 and was a screamer,upper 12's all daylong with 3.23s in a 70 dart!.

And yet the performance is impressive in my view. Lets see if they attack you now for doing the same thing.