Yeah I finally picked out the camshaft and I am ordering it on friday. Lunati Flat Hydraulic Voodoo 262 Cam with lifters. The engine is a 305 bored 0.060 over. It has dished pistons, and a cast bottom end. I am going to put a edelbrock intake and holley carb on it. It is a 1980-1985 202 block.

Here is the question I know the 416's will not power this engine. I am looking into larger heads, for like the 327 and 350 etc. What should i get? My money is very limited and the valvetrain is going to burn a whole in my pocket. I was told to get 350 heads but what casting #'s should I look for, what heads port and flow very well for very cheap. 882s?

 

If you have a set of the 416's you already have the right head for your low budget performance project.
They will need complete home porting and larger 1.94-1.50 valves. Once they are ported , they will put out the power you're looking for.

A 350 cylinder head will typically not flow any better in stock form and has a much bigger combustion chamber which will drasticly lower the compression ratio on a 305.

Do not even think about using crappy "882" heads. Who ever is advising you to use those heads, does not have a clue.

http://www.goingfaster.com/spo/343hp305.html

 

i was looking for the larger valves, 2.02, how much to have new valve seats, guides, valves etc. ?

 

It is not desireable to use 2.02 valves on a 305. the cylinder bore is too small. A 1.94" valve is plenty big enough and will flow plenty enough on a ported 416 head. Use 1.94 and 1.50" valves. I have ported and flow tested many sets of these heads.

You do not need new seats. Just a valve job. Consult a local automotive machinist in your area for a price quote. (valve job, guide repair and guide boss machining (seals).

Decent replacement valves are about $150 a set.

 

Why dished pistons? With the larger chambers of the typical 350 head, compression is going to be lower than a snake's belly. Depending upon the dish volume, won't be great with 305 heads, even.

 

I wasn't the one who put those pistons in but they are in good shape, it should sit around 8.5 to 1, which would be great down the line. Puts in the hope for a whole lot of turbo. What would be a good PSI level for a cast engine sitting around 8.5.

And will that compression hurt performance?

 

That compression is low for NA, fine for low boost levels (I'm no 'spert about power adders, but from what I've heard, I'd guess around 10 psi would be safe).

 

If you want higher compression, once you've identified the dish volunme of your dished pistons and measured how fardown the bore the pistons sit at TDC you can have your 305 heads milled to reduce the combustion chamber volume.

I've flat milled them down to as far as 52cc's before.

you should be able to get your compression ratio into the 9.5-10:1 area by milling and selecting head gaskets.