Dave1647545494 Posted June 25, 2007 Report Share Posted June 25, 2007 aluminum cylinder head with a good quench area N/A 351w efi stock timing middle of the road street cam (under .600 lift under 300 deg of duration) 11.5:1 going to be too much for 94 octane I ran that compression( or higher ) on my iron head buicks, but with much bigger cams. never caused me any trouble so it seems doable,but fords are not buicks and I'm not sure thanks Quote Link to comment Share on other sites More sharing options...
Trouble Maker Posted June 25, 2007 Report Share Posted June 25, 2007 Run 16:1, it will be fine. Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted June 25, 2007 Report Share Posted June 25, 2007 Is this advertised compression dave? is the block decked at all? Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted June 25, 2007 Author Report Share Posted June 25, 2007 Run 16:1, it will be fine. hmmmm you got a powerstroke layin around I'll try it Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted June 25, 2007 Author Report Share Posted June 25, 2007 Is this advertised compression dave? is the block decked at all? advertised compression with my head volume 60cc the block is currently an untouched low mile low compression truck block ps I will not have my car at work for a couple days ( left the window down and the damn seat got all soaked) Quote Link to comment Share on other sites More sharing options...
baron_ Posted June 25, 2007 Report Share Posted June 25, 2007 too much 10.5 is really ideal for a 93 octane street motor, in my experience (alum heads) 9.5 for iron heads if you're perfectly tuned, and EFI helps...11.0 is doable 11.5 seems like you'd be asking for detonation or having to mess with timing so much that you'd be out of the power range it was built for i have no direct experience with Fords though... a good quenching chamber and the cam designed for the high compression can really help, ask crower for one that bleeds off the pressure a little maybe but i typically build motors that have a little room for my error....i'd be afraid of that being a monster to tune Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted June 25, 2007 Report Share Posted June 25, 2007 I would check with the piston manufacturer. Most of the time the advertised compression ratio is for a modified deck height. I would check with the piston manufacturer and see where they really come in at. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted June 26, 2007 Report Share Posted June 26, 2007 it will depend on the cam. Ive had 12.5 to 1 sbf's running 93-94 octane all day. thers always octane booster aswell. and like iroc said, it depends alot on how far the piston lands in the hole. Ive seen some as bad as .019 down the hole. making a 11.5 to 1 piston closer 10.9 to 1. Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted June 26, 2007 Report Share Posted June 26, 2007 Ive seen some as bad as .019 down the hole. making a 11.5 to 1 piston closer 10.9 to 1. yes this is what i speak of. just because it may be advertised at 11.5 (on a chevy at least) you will come in at 10.5 with no deck work. Quote Link to comment Share on other sites More sharing options...
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