1971 340 Build - Choosing piston rings dilemma

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Yes I agree with you there. I much prefer the OEM stuff made in America or Canada in the 70s to chinese made stuff in my cars. Even if it is strictly monitored by an American company. However there is no denying that there are many thousands of happy customers with SCAT rods in their engines and many turning high RPMs too. The oil hole is a very good point. However there is one main thing going against me using the original rods. Like an idiot, I think I sold them. I looked through my records and I sold some 340 rods, possibly from this engine, since I can't find them. I don't know what was going through my head, and only $50 too (Aust dollars), what a fool. This was back 10 years ago. I bought this engine back in 2009, complete engine, and it was a bargain at $1000 (about $650 US$) even though it was seized, but only one bore was responsible and the block cleaned up nice at 030. That leads me to the rods again... I have a set of low mile 273 rods I was considering (they are all bushed as you know) ... And before anyone laughs - I was getting new ARP bolts of course but also was going to get them cryo treated; there's a place in Sydney with a cryogenic facility and does a lot of drag racer's parts in there he says. Each cycle takes about 6 days for the full cycle: slow lowering, the retention and the ultra slow bringing back to room temperature. Which means that the rods will be as strong, or even stronger, than when they left the factory. Also this engine is only a mild engine, not more than 350-370HP I'd guess. However I would still be a bit reluctant to use 273 rods! Knowing that that's what they are.


273 rods are lighter than the 340 rods and you may have to get it balanced to compensate for the weight difference...

You can keep an eye on the mechanical for sale forum on here to see when a set of 340 rods are posted...