Gramps
I'm Awesome
- Joined
- Aug 24, 2012
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305 and 307 for that matter can both be made to run very well. The 305 has almost identical bore to the 265 and the 307 is a 283 bore. My 1999 Tahoe has a L30 305 with a 218/218 @ .050 cam, ported intake base, Volant CAI, long tube headers, 2.25 pipes to 2.5" high flow cats and a dual in/single out magnaflow. It put down 267 rwhp through a 4L60E and 9.5" 14-bolt.
A factory stock Marine 305 Vortec is also a 260 NET HP engine with the tiny 395' Marine cam in it and very restrictive water cooled manifolds.
I’m not disagreeing with a 305 being made to run well, hell they run very reliably in stock form. But, I don’t see a 305 putting out 267 to the ground with a few bolt ons. That would need to be making 320 at the crank. That little cam I don’t think so. Let’s see a dyno sheet? I’d love to eat my words.