Head & bore size relation?
Thread Starter
CF Senior Moments Member
Joined: Jan 2004
Posts: 1,329
Likes: 1
From: Oklahoma City Oklahoma
Head & bore size relation?
What are the guidelines for matching heads to a 402 blocks/bore size.
If my block bore size is 4.0005 how big should the head size be -
Pistons are Diamond 14cc
I see different descriptions for AFR 225 heads - large bore / small bore?
I guess the Head combustion chamber size opening (and cc size) ?
to maintain compression ratio of around 10 (+ or - .5)
with S/C what would I need - 72cc -65cc -62cc etc?
Would something like this work?
AFR part # 1660 Small 3.910" Bore
Thank you
If my block bore size is 4.0005 how big should the head size be -
Pistons are Diamond 14cc
I see different descriptions for AFR 225 heads - large bore / small bore?
I guess the Head combustion chamber size opening (and cc size) ?
to maintain compression ratio of around 10 (+ or - .5)
with S/C what would I need - 72cc -65cc -62cc etc?
Would something like this work?
AFR part # 1660 Small 3.910" Bore
Thank you
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 290
From: Pasco WA
Lots of guys use 3.9" heads on larger bore, but you give up clearance to use larger valves, and unshroud the flow area as well. IOW, it'll work, but not optimal. The chambers may be too small as well,raising your compression too high. Ask TM, if you want AFR heads, he's the master. I would ask TEA about TFS heads myself.
Thanks to all responders - much appreciated
