Quote:
Originally Posted by 69Goat1
Edelbrock...
If you are staying with the 400 combo the 72cc is the head for you to remain pump gas friendly. If you are going to stroke it the 87cc head is the one that is still pump gas friendly. They make the round port versions and the D-port version. The round ports will not work with the headers you currently have as they won't bolt up. The D-ports will work fine with the headers you have as far as bolting up to them.
If your iron heads are a true 260 cfm at .500 lift I would stick with them but if you are guessing they are 260 without a flowbench sheet then you might be surprised what they flow... An iron head that flows an honest 260 is a pretty decent head...
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I'd be wary of a local head shop porting your head to "260" cfm. Standard street port jobs are closer to 240cfm. If I "had" to have 260+ out of a set of iron heads I'd only trust one of the pontiac shops (Butler, KRE, Spotts in Hatfield, PA, Dude, etc.). As 69Goat said - 260 cfm from an iron port is a significant port job.
My recc - I'd opt for the KRE dports either let them do it or SD. Both have CNC machines and KRE got the 310cfm port job to me in less than a month. If money is a bit tight, then just by KRE dports stock from them - 1850 for 65cc heads and 1900 for 74cc heads. They are probably 2-300 bucks cheaper than the ehead dports. You don't need to change headers. Definately , when you swap heads - check your cams degree. ALL cams should be degree'd.