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I just went to the Summit online catalog and found this ad for the 225 slant six studs:
"Pro series cylinder head studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 220,000 psi. ARP Pro series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings."
Part number #142-491 $101.95. I think we paid more than that... so, apparently, prices have come down. :cheers:
I called Tom Wolfe, and you are 100% keyrect about his utilizing a custom Wiseco piston with lower compression when used with K-1 rods, which he also uses. You were also right about the measured compression ratio on his engine with those pistons; he said it was about 8:1. So, I was in error on his setup. I asked him about my 9:1 pistons and he said he thought it should be fine for my race-only application since I was not going to attempt to run it on pump gas (93 octane,) mixing that gas 50/50 with higher octane (110?) race gas, watching my A/F ratio closely at 11.5:1 under boost, and limiting my spark advance to 18 degrees (locked plate.) I hope he's right... he usually is.
I was apparently wrong about Ryan Peterson's pistons too; they are reportedly TRW's, but I don't know what compression ratio they are, or whether they are the old-design "Speed Pro TRW" pistons. Surely, they are,but I was under the impression that those forged pistons had been deleted from the TRW catalog years ago, and were no longer available.... so, I dunno; maybe I'll call Summit and ask them.
I apologize for all the bad information; I'll try to be more accurate in the future. Thanks for the correction(s.):oops:
