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Old 07-01-2006, 03:42 PM
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ARP rod bolt ?

Just won a set of 30 over .100 pop up forged TRW pistons and X rods of ebay. The rods were supposed to have arp rod bolts installed but they have bpc stamped on the heads of them. Does this mean Buick, Pontiac, Chevrolet? Thats all I could come up with. I thought the rod bolt I installed in my big block had (ARP) stamped on them. Any thoughts?

Also the pistons and rods came wiht a new set of Hastings chomemoly rings. The part number from what I can tell is 2c 139 030, should be for .030 over right? but underneath the bar code it has 4.000 .078 .078 .186 I guess this is the ring width? they seem to fit the ring grooves correctly but I haven't checked them in the bores yet. Any info would be great.

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Old 07-01-2006, 07:54 PM
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I don't think you got ARP bolts.
ARP bolts are rolled threads and have a dimple on each end to center the bolt when made and used to center the stretch gauge.

The rings appear to be 4.000 +.030 with 5/64 compression rings (.078). You might be able to trade them for what you really want.
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