Best OEM Cylinder Heads...no SVO heads allowed
I'm in the process of trying to figure out what heads to use on a motor for a drit oval track modified. It will be a 351W based build, and the rules require that the heads be OEM heads, no aluminum, and no SVO heads.
We are not allowed to port the heads. We can increase valve size, angle mill, etc, but no porting.
Should also note that we can run gas or alcohol, but that we have to run flat top pistons, and none of the piston can be out of the hole at TDC. And we're not supposed to have anything smaller than 60cc combustion chambers.
That said I'm not sure they'll go as far as CC'ing the heads and such, but it isn't very hard for them to check for flat tops, whether any piston is out of the hole at TDC, and any obvious porting.
What are my best choices for heads for this application in your opinions?
I'm guessing GT40's, but maybe there is something else that I'd be better suited to track down.
Thanks for the space!