These heads are an open chamber design. Not like the 67 heads that are of a closed chamber design. Now in your case this is to your benefit. More open area equals less compression. Not much but every little bit helps.
Title: These heads are an open chamber design. Not like the 67 heads that are of a closed chamber design. Now in your case this is to your benefit. More open area equals less compression. Not much but every little bit helps.
