arp bolts
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
arp bolts
I rebuild a 1977 400 and want to know if i have to get arp bolt on connecting and main. At least i was going to buy connecting rod bolts, they look small to hold 4" bore and stroke or i can use stock rod bolt ?
Posting Guru
Joined: Jul 2007
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Ive never seen one break before but it is highly recomended to change them cuz these engines were never ment to rev more than 4k and the obvios wear due to milliage, its pretty easy and they are cheap. I changed them myself i dont know why people say theres some adapting to do its pretty plug and play, they just have to be pressed out and in, I noticed they have a redish color to them, i guess its due to the hardness degree of the bolt.... I left my original mains though....
Lead Driver
Joined: Nov 2000
Posts: 6,640
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From: Albuquerque
Once the bolts have been in the rods and the rods are "reconditioned" you can't just take them out and replace them. They will have to be straightened again.
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Laughing Gas
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From: New-brunswick,Canada
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Posting Guru
Joined: Jul 2007
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I spoke to my machine shop about it, and it depends on the way you are removing them and replacing them, there they use a machine simiar to the one removing piston pins... and ofcorse you cant change your bolts the way mustang 81 wants to do it, you will have to remove your pistons from the block other wise you could hurt your rods by forcing them out and in.....
Lead Driver
Joined: Mar 2004
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How you remove and install rod bolts would have nothing to do with distortion of a rod bore. The ARP rod bolt will distort the rod bore because they are a little bigger (fatter) and take more to torque than a stock rod bolt, hence the distortion they WILL produce. It says right in ARP directions that you can't just put them in and run them.
Lead Driver
Joined: Mar 2004
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Used set of ARP's measured at the knurl .3785. Stock bolt measured at knurl .3780 = .0005. The actual over all diameter of the ARP bolt is .002 bigger than stock.
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
I'm gonna change them my way anyway. I know how to remove them without hit because i remove 2 of them from my 351m. I'm a welder and i know how to make something to remove them, work like a press. I made my own puller to remove the damper, piston stop to find the topdc. .002 ,i thing is not enough to tight my clearance between my connecting rod.
Posting Guru
Joined: Jul 2007
Posts: 1,355
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Mark is right, iv heard that everywhere, the reason still stands, what could happen if you just change them, i didn´t see any issues they just went out and the new ones in, the cap of the rod went in smoothly and torqued the bolts in without any trouble, balanced the engine, everything very smooth.... so whats the deal? what is the wrong here, consequences?