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: Question mdapperdan 03-12-2006, 02:17 PM I was hoping that one of the members would be able to answer this? I purchased a 350 cu. engine the other day and notice that all the head bolts were 13mm or 1/2 ". I have never seen this compared to the 5/8 I'm use too. Any help with this would be great. Thank Dan onetonbb74 03-12-2006, 04:32 PM there all 1/2 thread and a 5/8 head on the bolt if stock. ARP might be different myojunk 03-12-2006, 04:54 PM i bought a long block from a dealer 1 time that had these smaller head bolts that u speak of. it was for a tbi 350. i installed it and havent had any problems. i just thought it was a newer style bolt. mdapperdan 03-12-2006, 05:03 PM I was wondering are the head bolt's size Metric or SAE the thread size maybe 1/2 SAE. What would be the torque valve? thanks for the help. chrissybf86 03-12-2006, 06:32 PM was the motor out of a car? is the block 4-bolt main? mdapperdan 03-12-2006, 06:56 PM I can't tell you if it was from a car/ truck? It is a 4bolt main. Thanks, Dan | |