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Picking a B20 head for my 145 140-160

uid 32173's pic
posted by  Gary L on  Mon Mar 14 07:49 CST 2011
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last visit: Wed Oct 22 10:26 CST 2014
[RELATED]

To expand upon what George has already said...

- The "E" and "F" heads have the same size valves... 35mm exhaust, 44mm intake.

- I could be wrong, but I was under the impression that all "F" heads had hardened valve seats from the factory. Maybe it was just the later ones though (73'ish & up). This is based simply on the fact that my '73 ES owner manual clearly states that low-lead gas may be used.

- In bone stock configuration, I believe the "E" head flows a bit better than the "F", and for sure it carries much higher compression... 10.5:1 vs 8.7:1. Bottom line was about 10 (SAE net) hp difference between the two, assuming d-jet injection on both.

- The difference in compression ratio between the thinnest gasket (about .030") and the thickest (IPD's low c/r .068") is going to be approximately 1 full point... e.g. 10.5:1 vs 9.5:1.
--

Gary L - 142E ITB race car, 73 1800ES
BlueBrick Racing Website
YouTube Racing Videos






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