Need an old-school opinion about a 350 head swap and cam installation.?

I am a cam designer/manufacturer & full competition engine builder.

The 882 casting head is the poorest flowing factory casting head ever produced for a 4 inch bore block. THe 305 heads are designed around a smaller bore, so don't use them. They will flow less so your cylinder pressure will drop in terms of dynamic pressure. Static compression will increase but you will put less air in the cylinder to compress. For the money, bolt on a pair of 062 casting vortec heads and the vortec flange intake manifold to go with it.

As for the cam, I have things that beat the comp stuff all around and anytime. If you are going to run a comp, the best all around street "shelf" grind cam of theirs you are going to get is their 268 High energy. The first one. Our founder designed that cam for them back in 1977.

Install a fel pro 1094 head gasket to tighten the quench.

A simple Z28 spring with a set of 7 degree "machined" valve locks will be good.

Email me with your questions.

can go with the 480 lift 280H comp cam(highest duration can go with stock converter) with stock springs will hold up just fine,but would watch taking over 6,G;s with stock pistons and heads with the cam the valves will float at 6500 and not getting any more power from engine at that rpm,should keep at or below 6,000. and blowing out the bottom end,you don't have enough compression,with stock pistons to worry about throwing a rod.the Z28 springs are not any different than the stock springs on the heads now,if you want top change out any way it's up too you but lap the valves and be done with it for now,if you can find a set of HO 305 heads will up the compression some with the 58 cc combustion chambers.

I don't know what he means "blow the bottom end out". I would be afraid the rings would be about worn out and if you turn it high rpm consistently it will begin to lose compression and burn oil. If a leak down test shows everything to be in good shape then you should not have any problems. If it was my car I would go ahead like you are planning and as soon as possible I would go for a better set of heads. Even late model Vortec iron heads will make more difference than anything else.

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