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Old 07-09-2014, 03:35 PM   #23
FireSale
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Default Re: Choosing a Manifold:SBF

Quote:
Originally Posted by SSDiv6 View Post
Let me clarify a lot of confusion as regards to your interpretation of the rule book and the engine specifications.

The Ford Racing Boss 302 is a Windsor replacement block that can be used in any 260, 289 or 302 applications. It replaces the old Ford Motorsports R 302 block.

Although the AFR cylinder head comes with larger valves, you still have to meet the valve size specs and combustion chamber size as the original OEM cylinder head as shown in the NHRA spec just as Jim Caughlin has stated.

Your pistons also have to meet the dome configuration and dish/dome/valve relief sizes as shown in the engine spec.

NHRA Stock and Super Stock engines are no longer an off-the-shelf engine you can build. They have become high tech engines that require a lot of more work and finese that other engines.
68 Cougar 302/230 stock heads
Intake: 1783
Exhaust: 1457
Head cc: 49.5
Rocker Ratio: 1.6

AFR 1399
Intake: 1900
Exhaust: 1600
Head cc: 58
Rocker Ratio: 1.6

Edelbrock 60217 heads (stamped NHRA Accepted)
Intake: 1900
Exhaust: 1600
Head cc: 60
Rocker Ratio: 1.6

If valves have to match stock +.005 like the rule book states, then neither of these heads listed as SS replacement heads in the Stock Car Classification Guide can be used without basically remanufacturing them down to factory specs. Why would NHRA approve heads that come either supplied or ready for valves that are too big?

Some posters on this forum make building for stock or super stock way too complicated. I refuse to be deterred.

Dale

Chris1529 I have so much money under my hood I can't fit my engine.
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