1975 chevy 350 - Camaro Forums - Chevy Camaro Enthusiast Forum

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Old 11-03-2008, 04:28 PM
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Default 1975 chevy 350

i recently bought a 79 camaro z28, i pulled the numbers off the engine this weekend and i found out it is from 1975. it is suppose to have only 145 or so hp stock. what are some good ways to get the hp up to around 300 or so without spending over about 1,000. right now it has a holley 4 barrel carb, edelbroke intake manifold, headers, and i cant remember but i think the cats are gone too.
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Old 11-04-2008, 08:53 PM
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Default RE: 1975 chevy 350

Chances are the motor has been overhauled since 1975, because of this it is not known what is inside. A lot depends on compression and cam. If you do not want to do the engine work twice it is best to overhaul it and build to your specs. Originally those engines did not have much compression, also if you start adding high perf parts you may stress old parts that cannot handle it.

If you plan on keeping the car I would vote for going through the engine.
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Old 11-04-2008, 11:09 PM
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Default RE: 1975 chevy 350

yeah that was what i was thinking but im not sure if i should bore then engine out when i rebuild it or not, also what about increasing the stroke?
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Old 11-05-2008, 09:46 PM
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Default RE: 1975 chevy 350

Bore and stroke a 350 for about 1K? Bore and stoke of the 350 is the least of your problems.
The weak point of that engine was dished pistons crappy cam and lousy heads.

You could replace the pistons and install a cam/lifters/valve spring and mill the head down. Probelm is by the time you add in all the little stuff, plugs, wires hoses gaskets you have pretty much blown your budget. You are still stuck with those crappy heads and intake. Do you have headers? If you had some skillz you could port them but the little valves will be an issue. Doubling the engines designed HP is normally not cheap. You could blow your whole budget on a set of heads.

IMO the cheapest way to get to a dependable 300HP from where you are now is GM's 290 HP crate motor. I think you can find them for just under 2k

The only other option is buying used, That is very risky for someone who is new to this. It can be tuff to find a few jems in a sea scrap.

If the motor is solid a carb/intake, cam. headersand decking the heads could get you to 220 HP fors little over1K

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