Quote:
Originally Posted by KingLT1
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Quote:
Originally Posted by Joshinator99
Good rule of thumb is one heat range colder for every 100-150 HP. Believe I read that from one of Howard Tanner’s posts back in the day. Safe to say he knows more about this platform than most of us lol
So,
Stock SS: HR 5
650 HP stock ZL1/supercharged SS: HR 6
750-800 HP: HR 7
900-950 HP: HR 8 (Brisk RR12S)
1050-1100 HP: HR 9
1200-1250 HP: HR 10 (Brisk RR10S)
Since 1250 HP is 1050-1100 WHP, that’s why I went with the RR10S.  |
Thanks for all that, gentlemen!!! That's definitely handy to have!!!
Quote:
Originally Posted by KingLT1
A head gasket failure doesn't mean the 1400hp rated engine is at fault. For starters, you were running too hot of a plug imo. A 6510 is a projected tip 7 heat range. At your power level you should have a non-projected tip 8 heat range. At bare minimum a Brisk RR12. With Meth and Ethanol fuels, you won't always get knock when cylinder temp and pressure is getting excessive. You could have also been running too much timing. Hard saying without looking at the plugs after a pull to see where the timing mark is on the strap. Last log I had seen of your old combo, the blower was maxed to make the power you want. Maybe consider putting a 427 in it and run 15-16psi instead of 19-20psi. You can't do at 6000ft what everyone else is doing at sea level. You are dealing with a 20% loss in efficiency due to air density.... everything has to work harder to make power.
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I watched a Steve Morris video from Tuesday night wherein he was tuning on a salt lake engine and talked about raising the compression ratio a little bit to account for the elevation DA loss. Might that be helpful here since he's up in the clouds?