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Old 06-08-2003, 03:47 PM
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Post 305/305ho/350 ho heads?

well Its been a while since I have been stumped, and now I am. I purchased a 81 elcamino 2 months ago. the camino has a 305 in it. with some crazy computer command controll system. the damn carb, rodchester type q-jet is sealed and has some electronic self adjusting system built into it for air mixture controll.
the car runs great for a stocker.
my budget is really limited right now. I would like to get some more performance out of my 305. i know that the engine is designed for smog, and they dont like to push more then 300 bhp. but some improvement would be better then my 170 bhp it puts out right now.
My buddy has a set of heads off of a 305 ho engine, and he has a set of fresh 350 ho heads off of a 82 camaro.
have read all the post concering the swapping of 350 heads onto a 305. this is what I plan to do.
I have enough money to rebuild the engine in my garage. basicaly I was wondering what style piston I should use for this swapp. the heads have a 64 cc chamber. compared to the 54 cc? the 305 heads have. I would like to have a comp ratio of about 10:1. any help would be appriated.
going to try to make this work.
thanks for the help.

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Old 06-08-2003, 04:30 PM
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if the 82 Camaro has factory type heads the chamber will be 76 cc, not 64, this will kill any compression, you would be better using some hi-po 305 heads, they have a 1.84 intake and 1.5 exhaust, use flat top pistons, this with a thin head gasket will up your compression and hp. A cam change would help, also a small Holley on a street dual plane and headers, then you will have good power, sound and dreveability.

[ June 08, 2003: Message edited by: BOBCRMAN@aol.com ]</p>
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Old 06-08-2003, 07:02 PM
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I just used a set of 305 HO vortecs 55cc. on a standard bore 350. With silovite flat tops and 4 valve reliefs the compression is 9:7:1. I have a mild cam GM 3896962 350 H.P. The difference over the 76cc heads is unreal. The car runs great. If you do go with a Vortec head you have to work on the manifold a bit as the center bolts are different than stock and you will have use self aligning rockers.

Keep looking for info. on here there are very knowledgable cyl.head guys. This was my first experience with the vortec and I'm happy
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