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Old 09-17-2016, 12:32 PM   #38
KirkEvil
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Quote:
Originally Posted by MDSheds_SS View Post
What gasket did you run and what was the comp ratio? Pump gas or Racegas? I'm going to Tune time on Weds to talk to Matt and get his opinion on the whole setup. I might even change the cam if he thinks there's a better cam for these heads. What cam did you run?
Old setup:
All stock LS1 shortblock
228/232 .612/.595 111+3 cam
TEA LS6 heads, 62cc chambers, PRC .650 Doubles, LS7 lifters, YT 1.7 rockers
.040" cometics
Fast 102/102, 4" CAI
ARH 1 7/8, cutout
Stock 4L60e/ HD2 shift kit
Vig 4000 stall
Full suspension, S60 3.73, 26" tire

Dyno'd 456/420 locked at RPM, and shift points were 6500rpm. I ran 92/93 pump on the street and test and tune nights, and didnt see a difference running race gas although it smelled amazing.

Static compression isnt as important to pre detonation as the dynamic compression driven by valve events. With .006" piston to deck height on my setp this calculates 11.3:1 SCR, 8.88:1 DCR, and .034" quench. Everyone has their own opinions but the general rule for DCR I found was:

91 pump = 8.5:1
92 pump = 8.5-8.6:1
93 pump = 8.7-8.8:1

Obviously I pushed the limits a bit with my setup on both DCR and quench but I was comfortable knowing that the combustion chambers of the heads and PTD were consistent or better than most of the combos out there trying to do the same. Full disclosure, this is a lot of theoretical number punching and I did take a gamble by just installing my cam dot to dot and took the cam card numbers for truth.

Do you have the full specs on your cam? intake duration @.006, LSA, and ICL? Any chance you measured piston to deck height? If you could provide those I'll list a quick rundown of SCR/DCR vs gasket thicknesses for your setup for you to decide.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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