C80E-F heads

10304 Views 25 Replies 7 Participants Last post by A/S65, Mar 9, 2013

A/S65

Discussion Starter · Feb 18, 2013

I aquired a set of 68 4v F heads over the weekend, they've been ported, 7/16 screw in studs and guide plates. They still have the factory valves though. I'm wanting to put bigger valves in them but am curious if with the 53.5 cc chambers, that I'm going to run into a valve shrouding problem with 1.94s. Or would I best be served with going with a 1.87 or 1.90 on the intake.

These are going on a 306, that I'm building to meet vintage rules mandating factory cast head. So please no ditch the iron and get some aluminum heads replies.

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A/S65

Discussion Starter · #21 · Feb 20, 2013 (Edited)

D0ZF said:
Are you looking at the SVRA rules
http://www.svra.com/wp-content/uploads/2013/02/Ford-Mustang_Sedans_64-70.pdf

From what I seen these rules serve as some kind of guideline but when you go check out the cars running these events its quite clear most are far from those rules.

No I'm building according to HVR and Corinthian rules which parralel eachother with a few exceptions.

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turbo2256b

· #22 · Feb 20, 2013

Notice the ruls allow for b production 351W heads
Rules for trans am dont say anything about W heads
Both list pre 73 stuff only exception boss heads 69 builds and beyound.

Shelby drop allowed? I drop all my mustangs to more than the 1" but what was used in the race cars. How about other suspension mods done in TA racing?

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D0ZF

· #23 · Feb 20, 2013

A/S65 said:
No I'm building according to HVR and Corinthian rules which parralel eachother with a few exceptions.

I see you, gotta run original type heads.
Looks like these clubs have pretty much the same standards my club also requires to run original heads. 69 351W heads are probably my best guess for max power potential but I also believe C8OE-F can offer a decent potential.

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turbo2256b

· #24 · Feb 20, 2013

Almost all SBF heads with the small ports flow about the same. Once ported properly same story. The larger port 351Ws 40s and Ps have about the same potential ported. I am not a big fan of the P heads though.

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A/S65

Discussion Starter · #25 · Feb 20, 2013

turbo2256b said:
Notice the ruls allow for b production 351W heads
Rules for trans am dont say anything about W heads
Both list pre 73 stuff only exception boss heads 69 builds and beyound.

Shelby drop allowed? I drop all my mustangs to more than the 1" but what was used in the race cars. How about other suspension mods done in TA racing?

The drop yes, factory control arms can be strengthend.

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A/S65

Discussion Starter · #26 · Mar 9, 2013

turbo2256b said:
68 4v head specs
Chamber CCs 52 to 55 cc
Valve sizes 1.78 / 1.45... my size reommendation 1.84 / 1.54 (351W 69 to 71)
Port size W x H 1.04 x 1.94..... 1.16 x 1.94 (351W 69 to 71)
Thermactor emmision control.

What rules as to cam intake, carb

Heres a bit more info on my heads

Intake vlv 1.87
exhaust 1.55

intake port 2.05x1.18
exh 1.48x1.24 d port

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