torque specs. for my "1991" 502 bottom end??
06-13-2007, 06:48 PM
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torque specs. for my "1991" 502 bottom end??
hey guys i've got a list of torque specs. a mile long but nothing for the 4bolt mains in my 502 or the arp bolts in the h-beam rods. the mains look to be 1/2" bolts?? Thanks for the help !!!
06-13-2007, 09:03 PM
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i just posted about this a few days ago but i just put one together with arp studs and they called for 85-95lbs ft with moly lube.
the 6.135 manley h-beams came with explicit instructions to NOT USE MOLY. use 30wt instead on the 7/16 arp bolts and torque to 95lbs ft. <---- not a typo.... 95lbs for real.
the 6.135 manley h-beams came with explicit instructions to NOT USE MOLY. use 30wt instead on the 7/16 arp bolts and torque to 95lbs ft. <---- not a typo.... 95lbs for real.
06-13-2007, 10:35 PM
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WOW i can tell ya that they where no where near that, as a matter of fact i thought they where practicaly loose ,i should of tryed one with the tq wrench. i clipped a little chart out of hot rod mag. years ago that says 65# for arp bolts???
06-14-2007, 08:55 PM
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Paul,
You absolutely have to contact the rod manufacturer to get the correct specs for the rod bolts. If they are not torqued to the same spec as when manufactured, the rods will not be round when assembled and can result in bearing failure. ARP will not give you a torque spec, or stretch number, they will tell you to call the rod manufacturer. I have seen three different brand rods with what appear to be the same 7/16 ARP bolt and all three use a different torque spec. If you can not get a number from the manufacturer, the best thing to do would be to assemble the rods and torque them in increments until the big end id is round. That will be close to the correct torque to use.
Same thing really goes for the mains, you need to know how they were torqued when the block was align honed.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
You absolutely have to contact the rod manufacturer to get the correct specs for the rod bolts. If they are not torqued to the same spec as when manufactured, the rods will not be round when assembled and can result in bearing failure. ARP will not give you a torque spec, or stretch number, they will tell you to call the rod manufacturer. I have seen three different brand rods with what appear to be the same 7/16 ARP bolt and all three use a different torque spec. If you can not get a number from the manufacturer, the best thing to do would be to assemble the rods and torque them in increments until the big end id is round. That will be close to the correct torque to use.
Same thing really goes for the mains, you need to know how they were torqued when the block was align honed.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
06-16-2007, 10:32 AM
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i can't find enough markings on the rods to tell the manu. so i just cranked them all to 75-80# do you think that will be alright. it seems a bit tighter than when i took them apart!!!
06-16-2007, 03:05 PM
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Paul,
What do the rod bolts say on them ? The only way to know if what you did is ok is to take one of the rods to a good machine shop, torque it the same way and see how round the big end is. Period. It might be ok, but it might not ..... how much money do you have tied up in the engine that you can just throw away ???
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
What do the rod bolts say on them ? The only way to know if what you did is ok is to take one of the rods to a good machine shop, torque it the same way and see how round the big end is. Period. It might be ok, but it might not ..... how much money do you have tied up in the engine that you can just throw away ???
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
