Quote:
Originally Posted by 69RSZ
The 1970 LS6 was rated a conservative 450 HP for certian reasons but it was more like 650 HP, and they were installed in more than 4,000 1970 chevelles.The only other motor that might come close is the all aluminum 1969 ZL1 427.Im not sure what the HP was.
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There's a copy of the ZL1 dyno test somewhere on the web. I forget the actual numbers but I know it picked up 80hp when they disconnected the stock exhaust, and the 430hp number was reached by shutting the dyno off early.
Also, do not confuse Gross vs. Net HP... LS6 was 450hp gross.