6.770" Chromoly Heat-Treated 5/16" 0.080" Wall DNA® One-Piece Pushrods Although the GM heads are

Although the GM heads are good pieces

and these cast aluminum pans have a beautiful polished finish for great looks

They feature lightweight construction with a thick rail for gasket support

the IAC valves adjust the airflow to improve motor idling

or another that's set up the same

6.770" Chromoly Heat-Treated 5/16" 0.080" Wall DNA® One-Piece Pushrods Although the GM heads areGet all of the performance that your engine can produce with these durable pushrods designed especially for high lift cams. Speedmaster pushrods are available in both 5 16 in. and 3 8 in. diameters. They feature . 080 in. wall thickness and are formed from 4130 chromoly steel. These one piece Speedmaster pushrods are heat treated for use with guideplates. They have a minimum wall thickness of . 080 in. to handle higher rpm, plus a black oxide finish.