ebay click supposely 64cc (seems awful small)

and 475 a pair.

ebay click

supposely 67cc (seems even less likely)


flow numbers

edit guess I was away for a while..

 

https://www.thirdgen.org/techbb2/sho...ight=superflow

 

Unless you have a makita die grinder, and lots of patience, I'd stay away.

Tom bolted those on his 406.. (blower, cam, etc) and got like some crazy low HP figure. like 2xx. He says its the cam.. I"m thinking the heads.

-- Joe

 

Looking down the intake port, I have to say, there is not much more room between the common port wall and the valve guide boss then stock heads. My world s/r heads almost look better. If you ever look at AFRs, Trickflows, etc. this area is rather large because thats where all the air flows.

I agree with ^ -unless you plan on 20-40hrs of porting, I wouldn't invest in these heads for top performance. If the flow #s are correct, however(and you can get the seller to gurantee them), they would be a step up from stock heads. But don't think your getting AFRs, TrickFlows, Brodixs type preformers for half the price.