Milling 823 heads on ly6
01-18-2019, 08:35 AM
#1
Staging Lane
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Milling 823 heads on ly6 What is a good safe amount to mill the 823 heads on an ly6 with stock pistons? I want to run the btr stage 2 ls3 cam which has .612/.585 lift. Hoping to get closer to the ls3 compression ratio, thanks.
01-18-2019, 11:14 AM
#2
TECH Senior Member
Lift has nothing to do with PTV. Duration does. By the time the valves are even close to fully open, the piston is far down the barrel. PTV is watched when overlap increases.
01-30-2019, 06:43 PM
#6
On The Tree
Have you found out yet? I was curious myself since picking up an LY6 too. I will be deleting AFM/VVT CRAP and camming it too. Unsure on specs because I'm undecided on 8L90/6L90 or T56.
02-01-2019, 06:03 PM
#7
Staging Lane
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about 9.4:1 to 9.6:1 according to an online calculator. I would have liked a bit more but didn’t feel comfortable milling more off.
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02-01-2019, 11:45 PM
#8
There is more to it than just a power increase, Raising compression also increase thermal efficiency so you'll not only increase power but slight gain in fuel economy.