'72 302 Rebuild
D.R. THE PATHETIC DORK
Joined: Jun 2007
Posts: 30,869
From: West Virginia
RE: '72 302 Rebuild
ORIGINAL: sstang
I have an intake manifold laying around that I'm considering to use for the build. It's a 289/302 manifold, i believe it has "offenhauser" written on it, and it is set up for two carburetors, and has two four-barrel Carter carbs sitting on top (I believe 450 cfm a piece). Is it worth rebuilding these two carbs and using this set up?
I have an intake manifold laying around that I'm considering to use for the build. It's a 289/302 manifold, i believe it has "offenhauser" written on it, and it is set up for two carburetors, and has two four-barrel Carter carbs sitting on top (I believe 450 cfm a piece). Is it worth rebuilding these two carbs and using this set up?
Thread Starter
5th Gear Member
Joined: Jul 2006
Posts: 2,663
From: NC
RE: '72 302 Rebuild
wow 2 4's on a 302...kinda overkill and more so for the look even if they are only 450's a piece
I also have a 600 cfm Holley four barrel laying around, I would just need a intake for it.
Thread Starter
5th Gear Member
Joined: Jul 2006
Posts: 2,663
From: NC
RE: '72 302 Rebuild
Well I know they wouldn't add more power since the engine wouldn't be built enough to take advantage of the flow. If I could use them without losing a lot of power though, then I would rather do that because it looks cool and I wouldn't have to buy a manifold.
Thread Starter
5th Gear Member
Joined: Jul 2006
Posts: 2,663
From: NC
RE: '72 302 Rebuild
I guess it will be a mild build. Things have changed so I will probably have it bored to .040" over (so I guess it will be a 308)with some high compression pistons. It already has a cam, which I believe is a Crane fire ball. I'm going to wait and look for some decent heads and port them, and the exhaust would be free flowing with long tubes. If I topped it with the Offy intake & 2-4's, would that work? Or would there stillbe power to be had with less carburetion?
Also, what is a good streetable compression ratio that can be use with 93 octane?
Also, what is a good streetable compression ratio that can be use with 93 octane?
4th Gear Member
Joined: Mar 2007
Posts: 1,080
From: Chandler, Az
RE: '72 302 Rebuild
The only 351w heads worth using are 69-70. World castings makes some decent priced iron heads too. You might look for a progressive linkage setup for the 2x4 intake. That way you only run off one carb till you jump on it.
http://www.jegs.com/i/Edelbrock/350/7094/10002/-1
Compression ratio with pump gas will depend on the cam alot. 9.5-9.8 should be safe, you cant get 93 octane everywhere. Here in AZ you can only get 91.
http://www.jegs.com/i/Edelbrock/350/7094/10002/-1
Compression ratio with pump gas will depend on the cam alot. 9.5-9.8 should be safe, you cant get 93 octane everywhere. Here in AZ you can only get 91.
