Sportsman 2 heads on 305? - Third Generation F-Body Message Boards

foxracer1 · 10-20-2009, 11:27 PM

Comments? I plan for mild boost. I got the heads cheap and got a lt1 cam gonna run 1.6 rockers. Peak lift of .480I .491Ex. Will i run in to cylinder wall clearence issues?

The heads will be milled 20 thou or so. Gonna use the compression drop for added room for boost. The 200cc runners are a little large.

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3rd gen Will · 10-20-2009, 11:34 PM

You will run into cylinder wall clearance issues. The 2.02 valves hit the side of the cylinder wall at just over .500 lift bacause of the narrower bore of the 305.

There is an amazing thread with excellent pics on the site here, the pics taken from the bottom of the cylinder the guy posted all sorts of lift measurements vs valve size too.

Here it is!

http://www.thirdgen.org/techboard/te...ds-1-94-a.html (305 heads with 1.94", 2.02" and 1.5", 1.6" valves)

SOO sell the heads to me! haha

foxracer1 · 10-21-2009, 08:55 PM

Quote:

Originally Posted by 3rd gen Will

SOO sell the heads to me! haha

ha ha well they are atop my 400 i'm building but thought about just running them on the 305 couldn't remember how much you could get away with on 305s.

3rd gen Will · 10-22-2009, 12:46 AM

Quote:

Originally Posted by foxracer1

ha ha well they are atop my 400 i'm building but thought about just running them on the 305 couldn't remember how much you could get away with on 305s.

Right on man! But Hey I had to try! LOL

foxracer1 · 10-22-2009, 08:58 PM

Its all good. It is worth a try. Thanks for the links.

3rd gen Will · 10-23-2009, 12:34 AM

No sweat man, I am just glad there are guys on here like casey that do that kind of documentation so other people don't have to find out the hard way.