[learjet60]

I am currently in the building stage of a 350 chevy small block and had a quick question on the heads I may be using. A friend of mine suggested that I use a set of 305 chevy heads which would be worked to accomidate a 1.94 In/1.60EX. valve with a 58cc chamber. He said that it was a pretty do-able thing and would make my compression ratio very good as well.....anyone have any experience with this kind of build??? any ideas would be greatly appreciated..Thanks

[Silentlion_69]

maybe if you would post this in the engine section you'd get a good answer

[poncho62]

moving it.....

[RCastle]

From what I understand you can do it,but you can do the same with a set of 350 heads and they flow better than the 305 heads.The 305 heads even ported do not flow like a set of 350 heads I believe. So in essence sinking the money in them is not worth it.Somone correct me if I am wrong.

[Siggy_Freud]

There are a few people here that have had success running 305 heads on a 350. However I believe they have given them a significant port job to flow well enough for a 350. Depending on your pistons, those small combustion chambers might put you a little high on compression and give you some trouble running pump gas.

There are are lot better options for heads both in stock form and aftermarket for the 350 than 305 heads.

[Mad Maggot]

I currently run 305 heads on my 350 in my Trans Am, I did give them a port job to help them along though. I got them to flow 203cfm intake and 155 cfm exhaust with the stock valves, which is about as good as a stock 350 head. I get about 400HP out of my motor with them, but that is about maxing out the head flow, and being helped by 11.7:1 compression. I need to run octane boost with this much compression, plus a special waterless coolant to prevent detonation. If you are willing to do some porting to them they can be made to work quite well, but if I had to do it over again I would have used 350 heads with small chambers.

[killerformula]

bowl area is constrictive due to small valves, the runners are about the same. There's a fair bit of work involved, but you sound like you want to bolt them on just for the compression boost. No, its not worth it for that, ever.

K