rod bolts

Alaska Jim

Alaska Jim

Well-known member
I was looking at the ARP web site and see that there is a different listing for the 239,272,and 292 rod bolts than the 312 bolts. since I am not that familiar with the y-blocks can anyone tell me the difference between them. it may be obvious if I had a set of each to look at , but I don't. any information would be appreciated.----Jim
 
I cant answer the question. When I built my 312, we used 400 Chev ARP bolts. ARP may make a set to fit easier now.
 
312's had different rods than the 272/292. The 272/292 had same stroke, different bore. Not sure about the 239.
 
Jim

I'm gonna make a guess and say that if the rod journal was larger on the 312 crank that the bolt needed to be longer. :confused:

Oldmics
 
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the rod journal on the 312 is the same as other y blocks.the 312 and the other truck rods cite and c2ae use the same bolts.a little stronger i guess.
 
It's the length of the bolts that dictates which rod bolt set is used. The EBU rods (272/292) requires the longer ARP 154-6005 bolt set while the ECZ, C1TE, and C2AE rods requires the shorter ARP 154-6004 bolt set. The effective length of the 154-6004 bolts is 1.900" while the effective length of the 154-6005 bolts is 2.125". The longer stroked 312 crankshaft required a connecting rod bolt that was shorter on the top side to facilitate clearing the camshaft.
 
Ted, thank you for clearing that up. I kind of figured it was a length issue, but did not have any bolts to compare, and the arp web site did not give any specs. you are a wealth of information, thank you for all the information you have provided me.-----Jim
 
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