Around 180-230rpm for cranking is pretty good mate. I've got my Dad's 6L LS here that i've been sorting out and with a verrrrrrrry old battery it would drop to about 10V and crank at like 100rpm before catching. I'll take a log in the morning, but it's probably around that 180-230 range with the new battery now.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120
'66 Pontiac GTO - 389, 4 speed street cruiser
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