Cylinder Heads 101

Scarecrow,
I have put 2.02s in the 318 heads but this doesn't leave much left in the head for reinforcement. That head flowed in the 245 range but would scare me to run on the street. The 587s and the 915 heads are very similar in design, and if you will look back that the port runner volume was with in 2 ccs or so. Also if you look back and look at the low lift flow #s that the 2.02 is considerably less than that of the 1.88 done the same way.
The problem with putting the bigger valves in the heads is the chamber shrouding and the cylinder shrouding, and that the valves may actually hit the cylinder walls at lift depending.


BJR Racing