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webfoot · 06-14-2019, 01:44 PM

Pretty sure stock is 345 hp.

Upgraded cam and valvesprings is good for another 40 or so, the heads are definitely not a limiting factor.

06-14-2019, 01:44 PM	#7
webfoot Registered User Join Date: Nov 2007 Location: Hermiston, OR Posts: 947	Re: 5.3 engine Pretty sure stock is 345 hp. Upgraded cam and valvesprings is good for another 40 or so, the heads are definitely not a limiting factor. __________________ *Running in place gets you nowhere fast.* -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC.