02-18-2015, 02:44 PM

billkinney billkinney is offline

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Join Date: Jan 2006

Location: Okeechobee Fl

Posts: 59

6x-8 heads

I found a set of 6x-8 heads. The only other casting marks are GM2 and a146. What will these heads add to my Basic stock 67 400 if they are polished and matched to a performer intake ? 8.5 to 1 pistons , rv cam, turbo 400 and 3.90 posi. with 3" pypes. Are these large chamber? Currently I have 4x heads. Not looking for wheel stands, just a little something special.
Thanks for your help.

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