Simple EFI & compression question
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Senior User
Joined: Aug 2003
Posts: 239
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Simple EFI & compression question
Howdy all,
Was wondering what compression a stock '89 351W has?
I have an idea (ohhhh *****!), I wanna rebuild the stock e7 heads with 1.94/1.60 valves, mill them .001 under, and rebuild motor with 9.5:1 compression (or somewhere in the area).
What are the side effects to this? Is this a feasable idea?
Motor is in a half ton pickup. Any suggestions on cam theories or ideas?
Main question: will the speed density system accept the heads and higher compression? I know the cam will need to have special attention paid to, but I'll worry 'bout that another day!
Thanks for all the help!
Was wondering what compression a stock '89 351W has?
I have an idea (ohhhh *****!), I wanna rebuild the stock e7 heads with 1.94/1.60 valves, mill them .001 under, and rebuild motor with 9.5:1 compression (or somewhere in the area).
What are the side effects to this? Is this a feasable idea?
Motor is in a half ton pickup. Any suggestions on cam theories or ideas?
Main question: will the speed density system accept the heads and higher compression? I know the cam will need to have special attention paid to, but I'll worry 'bout that another day!
Thanks for all the help!
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Speed Density should not care about compression ratio. It is the ignition timing that may be if the knock sensor goes off. Higher octane gas may be required. Different cams and bigger valves may upset SD, but not compression.
Jim
Jim
