Which Heads?

IMO the GT-40X heads are a pile of junk even on a 302...not even in the same catagory as AFR 165s, let alone VicJR's. I'd consider AFR 205s, VicJR's, and some variations of Trickflows.

Actually, those trickflows in the classifieds look pretty tempting for a 408, but the flow numbers kinda scare me, I'd question the port job, were they chasing flow numbers and top end HP or is there some mid-range flow left? More often than not, ported-all-to-hell-and-gone heads can make for a lazy street engine because they've been set up to work at .700" lift and 7000rpm and nowhere else.

The reason AFRs put a beating on everyone else is their mid-range flow That and port velocity is what creates torque and top end HP..best of both worlds

The AFR 205's seem to be what most magizine write up go with. I do not think you can go wrong with vic jr's either.

id go with a set of the cnc raceported tfs highports

TFS HP's 210cc race heads

here my ad:

AFR 225cc or similar cylinder head for a 408.

I like their lightweight valvetrain, compared to the competition.

I dislike small base circle camshafts.

wouldn't you want the arf 225's over the 205's for a mostly track car?

Blown Spring GT said:

The 225cc heads need lots of rpm to make power. My combo will not see any rpm over 6500. The cam profile is good for 2500-6800rpm. I am looking for gobs of tq and a healthy amount of hp. The 205cc heads are a happy medium. That gives me great power for the track and some limited steet time.

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Is that cam powerband for a 302 or a 408?

Blown Spring GT said:

The 225cc heads need lots of rpm to make power. My combo will not see any rpm over 6500. The cam profile is good for 2500-6800rpm. I am looking for gobs of tq and a healthy amount of hp. The 205cc heads are a happy medium. That gives me great power for the track and some limited steet time.

Click to expand...

Incorrect.

Only reason to choose 205's over 225's in this case is if you don't want to buy custom headers. You're building a 408, not a 289.

Do not post links to classified adds. Send the person a pm with the link.
Thanks

Just for clarification, an AFR 205 is not beneficial at all on a 289, unless you are spinning it upwards of 9-9,500+ RPM.