that cam must give me some leway cause i had to use mid grade gas a couple of times in a bind and no ping unless i got into it...i try to run the good stuff...

Part Number: 110551 Grind Number: H-228/320-6
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1957 1987 CHEVROLET 8 PERFORMANCE USAGE, GOOD MID-RANGE TORQUE AND HP, BRACKET RACING; STREET, HEAVY, ETC., AUTO TRANS W/3000+ CONVERTER, 9.5 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 2800-5800
Engine Size Configuration
262-400 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 320 @Valve 480 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 320 @Valve 480
Rocker Arm Ratio 1.5

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 36 BTDC 68 ABDC 284 °
Exhaust 68 BBDC 36 ATDC 284 °

Spring Requirements: Triple Dual Outer Inner
Part Number 96802
Loads Closed 107 LBS @ 1.800 or 1 13/16
Open 284 LBS @ 1.340
Recommended RPM range with matching components
Minimum RPM 2800
Maximum RPM 6400
Valve Float 7000

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 12 BTDC 36 ABDC 102 228 °
Exhaust 44 BBDC 4 ATDC 110 228 °