Quote:
Originally Posted by GUMP
The ZL1 was not "dragstrip ready" as delivered. Do those modifications and it ran A LOT better. Add 50+ years of rule changes and it's rated only 15 HP above the factory rating. Do you have dyno numbers that you can share on that combination? It was competitive in 1969 with very few modifications and I believe it's still competitive at it's current rating?
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2022 572 COPO 500HP FACTOR
.720/.720 CAM LIFT
13.8 actual compression ratio
GM 401 ALUMINUM HEADS
2.25/1.885 VALVES
340CC/130CC RUNNERS
90mm throttle body that flows 1000cfm( Rumor has it Patterson made over 1000hp with the SS version of it with same 90mm throttle body)
1969 427 430/445 HP
.580/.620 lift
13.8 actual compression ratio
GM 401 ALUMINUM HEADS
2.195/1.885 VALVES
320CC/120CC RUNNERS
850CFM Holley Carb