swflclassics

I want to build a 302, Chevy Small Block, any one know for sure what crank and rods to use ? Im using a 327 block

jmarkaudio

The 302, 327, and 350 all use a 4" bore block. What you need to know first is which block you have. Most 327's have a small journal crank, although a few later ones did come with the large journal. Measure your main bore with bearings. An early SBC, 265, 283, 327(early), 302(early), has a 2.30 main. The later SBC's, 302(late), 305, 307, 327(late), and 350 use a 2.45 main. The lone wolf, the 400, uses a 2.65 main. Once you have that, you need a 3" stroke crank for the block you have. You can get it for small or large journal, so you can build a 302 with a 302, 327 or 350 block, just a different journal size depending on what you have. For rods, it will be a 5.7", also small journal(2") or large(2.1"). Make sure your block is in serviceable shape before you buy parts. If it is not, I would look for a later 2 piece rear seal 350 block to build from(large journal). Large journal parts will be easier to obtain as well as cheaper. Now the bad news. A 3" stroke crank is not a popular item. You will have to start calling crank companies, most can make it but usually for high end racers, not cheap. A 3.25" and up can be had more readily, Competition Products carries plenty of selections. You might get lucky calling the crank companies and get something on the shelf they want to get rid of, just have to make some calls. Good luck.

XTRW

Thanks so much for the info.. its a great place to start, on the drawning board. Thanks

blaneym

What year block do you have? Do you have the Crank that was originally in it? Do you also have the rods?

If you desire to build one with stock parts except for pistons and you have a small journal block then you may use a good used and magnafluxed 283 cu. in. or '67 302 Z28 crank, however if you have a large journal block the only stock crank that was 3" stroke was the 302 Z28 cranks made during '68 and '69. If you want to build something that will withstand more rpm then like jmarkaudio mentioned you need the proper aftermarket 3" stroke crank, which depends on the year block you have. The 327 used the "small journal" crank through 1967, and then went to the large journal in 1968 and '69. When buying an aftermarket crank, rods, and pistons you will need to first decide if you want to use the stock length 5.7" rod, or a 6" long rod, and then buy everything to match, and have them balanced.

I can sell you everything you need at competitive prices.

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Marvin

www.blaneyscompetition.com
www.blaneyscompetition.com/blaneyracing.shtm