04-14-2005, 02:53 AM
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CC Member
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Join Date: Mar 2004
Cobra Make, Engine:
Posts: 7
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Not Ranked
Help 390 Dog
I have a rebuilt 390 That does not run strong/pull any help would be appreciated this is were I'm at bore is .080 Silv-o-lite pistons PN# 1138 Comp.Height 1.66 compression ratio(s) 10.3 crane cam 941 Edelbrock performer manifold holley 650 DP headers Mallory unilite dist. At 750 rpm idle vacuums 14 Compression tested 140 low 150 high my question is that enough compression? also if not what is the best way to raise compression?This is the cam spec. Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 1 BTDC 35 ABDC 107 216 °
Exhaust 51 BBDC (3) BTDC 117 228 °
Lift: Intake @Cam 3027 @Valve 533 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3200 @Valve 563
Rocker Arm Ratio 1.76
Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 25 BTDC 67 ABDC 272 °
Exhaust 75 BBDC 29 ATDC 284 °
Also I decreed the cam and it is right on the numbers
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