That is true. a small Or big Block chevy will not start if the compression is to high for standard 87-93 octane. I know been there done that. BUT I will tell you this will not hold true to our chevy L6s I s was pushing between 13.9-1 to 15-1 as we figured from the CCs on the head. with a 2 staged Pop-up piston. But any how longger story short The Motor would fire up with just a Bump of the Key ONLY and The only problem was is would not shut off . Never heard a sound from the motor other wise. No Ping no nothing. and There WASn't any Marks In the Pistons Or the Valves and I have Photos to prove that. But Make four passes down the track and it would Blow the head gasket by the fourth pass. How ever This was a daily driver On 87 octane and a weekend racer for just over 17yrs. Ran 112 at the track and i got 18 city and 24 hwy with 3:08 gears offey intake and headers with a 600 holley.( and the cam was a crane 583-607 lift)Then I finaly changed the gear set to a 5:13 Not that this would work for everyone Nore would I tell anyone to drive one that way.But it worked for me.
New changes have been made to the new motor But will still be pushing the 13-1? no less then 12-1 with a new bump stick of 691-680 lift and the 5:13s will still be out back Unless that I find it is in need of more :)as for the Pistons The same ones will be used But to with changes They have been floated and a Fire slot has been cut to face the exhaust If i remember right. I will find out and get pics as soon as I go pick the motor back Hoping this week sometime. I plain to pull the head off to get them photos seeing that i didn't get to take them Before they started to balance the setup and put it together.And as many heads I have cut up in the past few yrs I'mnot sure just How much decking is there to cut the groove to start with. and Some people mill these heads as Much as .100 so That wouldn't leave very much left and Would surely endup cracking If it ever was to end up Over heated. cause I have seen this happen to more then one that has been milled .100 and it Sucked the head into the water jacket.
God doesn't like ugly.
