Max Compression for Pump Gas
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Laughing Gas
Joined: Jul 2002
Posts: 769
Likes: 12
From: Moneta, VA
Max Compression for Pump Gas
I'm planning on putting '66 289 heads on my current '82 302. Sure they don't flow as well as aftermarkets, but their as good as E7TE's. Besides, I got them in my garage already, so that means nno additional costs. They are a vast improvment over my current D8AE's with 69cc combustion chambers and 8.4:1 compression smogged to heck.
Only problem is that with the 289's 54.5 combustion chambers, that'll bring my compression up to about 10:1.
Do you think 10:1 is too much for 93 Octane pump gas. The heads will be stock and I'll be running a Summit cam (PN SUM-K3600, 204/214 Duration @ 0.050 and .448/.472 Lift)
Only problem is that with the 289's 54.5 combustion chambers, that'll bring my compression up to about 10:1.
Do you think 10:1 is too much for 93 Octane pump gas. The heads will be stock and I'll be running a Summit cam (PN SUM-K3600, 204/214 Duration @ 0.050 and .448/.472 Lift)
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I run my 68 Merc's 390 on 89 and it's got 10.25 to 1. Cam is a Crane 272 degree Energizer. You may be pushing it with that Summit cam. It's more of an RV type grind for lower compression engines.
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