I just did mine with a new snap on compression gauge kit.
This was 10 rev per test, on a stone cold motor, with 50k miles.
Compression test 11/4/2020
10 cycles per
#1 230 psi good plug
#3 220 psi bad plug
#5 228 psi really bad plug
#2 250 psi good plug
#4 250 psi bad plug
#6 0 psi real bad plug
Burned valve in #6 hole.
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NA on E85 - 12.402 @ 112 mph
100 shot E85 - 11.589 @ 117 mph
JWT C2 cams rev Base Circle & Titan Valves
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