2 bbl head selection

[ford396]

The 14* heads do not require an offset lifter. I am running them on a flat tappet engine.

My 358 flat top engine with RHS 14* is at 488 at the rear tires with a flat tappet cam and a gauge legal 4412. I know that dynos vary, but I have an almost identical engine, difference being heads, and on the same dyno it is down about 45hp to this one. It has conventional 23* heads.

[Necrosis]

If you can't breathe it, squeeze it.I'd place importance on a very small chamber with darn near flat-tops, to get you in the 14.5:1 region, and use alky for sure. Don't get stuck having a huge dome to impede flame propogation.14° Rhs are great, if you're sure the rules won't change, or if you will only run one track. If you plan or forsee crossing over to a 23° class, with a 4412 rule, then I'd go raised runner or Dart 215. We've built a 362 4412 gauge legal engine with those heads that made 608hp on an honest dyno. However, it was a high-dollar build with a decent amount of R&D. Just showing it is possible. Also, don't think in terms of runner CC, but CSA, specific velocities, tapers, coefficient of discharge, etc. We don't even look at the CFM #'s on the flow bench, because if you get the other parameters correct, the engine WILL run it's a$s off.

[7uptruckracer]

Not to highjack this but I'll assume this is for a aluminum head what would you use if you had all these other rules BUT had to run a Steel Head on a 4412. No CI limit.

[nguyenvinh2]

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