01-03-2007, 11:11 PM
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CC Member
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Join Date: Feb 2006
Location: Columbus,
OH
Cobra Make, Engine: Shell Valley- 390 FE, 4 speed toploader, 3.50's
Posts: 249
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Thanks for the replies. So it seems that especially with aluminum heads, 9.5:1 is somewhat conservative. Thinking back, my Mustang Mach 1 (351C) had TRW forged pistons- supposedly between 10.5 and 10.7:1, but leaded gas was still available then.  It has been 15 years since I sold it, but I don't recall any detonation or pinging problems. I religiously ran Sunoco 94 Ultra.
I am still having trouble finding pistons, which is what motivated this post. I guess I knew going into it that FE parts are still scarce, but theres still less available that I had thought. Diamond quoted me $685.00 (41002's), Probe said 800-900, Egge machine said 300.00 for KB's, and Summit tried to talk me into 9.5:1 TRW's for 295.00...but nothing seems to work out CR wise.
I am still looking, but based on your advice and info, I would'nt be afraid to consider something 10.5:1 or so. Theres also more variables than I had realized which makes this thread even more interesting.
Greg |
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