[Pete Munroe]

Doug,

I was a little concerned when my 347" engine build ended up at a static compression ratio of 10.7 to 1.

The block is iron, aluminum TFS heads, flat top pistons, a relatively mild cam (that doesn't have huge amounts of overlap to bleed off compression) and it still runs ok on 91 octane.

Haven't looked for a while but I think it is set at 32 degree's...seems to be just fine. I figured I can always add timing easier than rebuilding.

At 13,000 miles, no problems...I don't try to accelerate in 5th gear for sure, but when in doubt shift down.

At the track, I always try to mix with unleaded race gas...show up with a low tank and fill the difference with 100? unleaded for insurance.

I would not hesitate to go to 10+ on the compression all things being comparable...

Unless you are running an automatic with really high rear gear, should be ok.

Maybe some of the the experienced engine builders will have something to ad.

Pete