I have some 1968 #15 heads. These came off of a big car and are the smaller valves. (1.96/1.66). 92cc chambers. I'd like to have valves worked to be the 2.11/1.77. Will the 92cc chamber be a hinderence?

My #16 heads I am running now are 2.11/1.77 72cc chambers.

Could someone explain, I just ready Jim Hands book on pontiacs....he lost me in the cam area! Way over my head...

Lets say we have the exact same engine for comparison, what difference would you see if nothing else on the engine changed but the chamber size.

I think I am litterly going to copy one of the sample engines in the back for my build, but want to save money and use the #15 heads that came with the engine.

And on a side note, what is the difference between #16 HO, #31 Ram Air I, and R96A Ram Air II? The specs are the same except the RA heads are round port, and the others are D-port....is it other engine componants?

Here are the specs of them all

• 1968-69......16.......400/428 Ram Air & HO........D-PORT........2.11/1.77...72 CC
  
• 1968.........31........400/428 Ram Air...............D-PORT........2.11/1.77...72 CC
  
• 1968 1/2....R96A.....400 Ram Air II..............Round Port........2.11/1.77...72 CC