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Just ordered Summit Pro LS 11:1 forged pistons for my dedicated E85 LSA build.
Most seem to say this is fine. Slightly scared, wanted 10:1, but choices were either 9.5:1 or 11:1. Am I doomed? Machine shop says people are doing it all the time now, some even higher.
I’m still contemplating having the +2cc pop up domes machined off of them and converted to flat tops when they arrive.
sounds good to me. plenty of heat exchange using lake water. e85 for the octane. I cant see how you can lose, unless you miss really hard with the cam.
can you fuel from jugs on the water where you live?
I’ve posted about it before, so apology on the repeat. This is good chat though, because the pistons just came in, and I would have the chance to spin them into flat-tops before I put the motor together.
LS9 gaskets and ARP studs will be fine, just make sure the surfaces are clean and flat for the MLS gaskets, copper spraying them can't hurt either.
On another note, look at how gloriously thick that piston crown is!
Last edited by Black_Sunshine_99; Apr 14, 2022 at 11:22 AM.
Thanks again for all the input. Yeah, the piston description says they are boost specific, so hence the ring pack low geography. Also helps to make it more forgiving during calibration I would presume. Machine shop said the skirts are thick as well. These pistons are stock stroke, 4.070" bore, 6.125" rod length, smaller 0.927" pin bore (SBC?) per the piston and rod kit Summit sells together.
Last edited by FormulaBoat; Apr 14, 2022 at 12:10 PM.
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11:1 e85 lsa 
