308 or RHS on a 408

rumblefish360 said

I never heard of the 308 "Prone" to cracking. Any head will if it can not be cooled, I just remember the 308 being any different than any other head. OE Magnums seem to have this issue.

I just priced a set of J heads to go from NYC to Washington state. Approx. $63 per head.

Loco, do you remember the port cc amount of the Indy head?

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Intakes are advertised at 179cc and exhausts at 67cc.
The intake numbers are 17-21 cc more than the OEM 340 and 360 heads as listed in the NHRA specs. But I haven't actually cc'ed any heads myself to confirm the actual as-cast numbers, so I am curious to know how close they are. I believe Brian said the chambers are somewhere around 65cc as cast even though they are advertised at 62cc. I wonder if he has measured any ports as cast.

http://www.autopressreleases.com/_uploads/docs/RHS Indy 360 X Heads.pdf