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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Even the performance versions of the 305 didn't make much power. If I remember correctly the heads don't breath well, which will limit the impact of any other changes.
I'd replace the cam and intake and try to create a free flowing exhaust. Any more than that, and you would probably be better off starting with a 350.
I recently saw a 290 horse crate 350 for less than $2,000. I doubt your 305 would approach that for less money.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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