Forged pistons
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Joined: Mar 2003
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From: Corvallis oregon
Forged pistons
I am in the process of rebuilding a 300 6. I am going to run a EFI exhaust manifold (too cheap for headers) a little cam and a 400cfm 4 barrel with an offenhauser intake manifold. I am going to stick with duraspark, but I am prepared to buy an aftermarket distributer if I have to. (I don't think the little six will be spinning too fast) I am also doing a little headwork and using roller rocker arms.
My question is forged pistons, I want them (for nos). I understand that I can use 390 pistons, do they have the same wrist pin size or do I need another trip to the machine shop? I would like forged rods too, but not if they cost an arm and a leg. Are there rods out of another motor that I can use that are forged or can work with forged pistons.
I know clifford deals with this kind of stuff, but I haven't looked beacuse all their stuff is really spendy.
Sorry about the long post.
My question is forged pistons, I want them (for nos). I understand that I can use 390 pistons, do they have the same wrist pin size or do I need another trip to the machine shop? I would like forged rods too, but not if they cost an arm and a leg. Are there rods out of another motor that I can use that are forged or can work with forged pistons.
I know clifford deals with this kind of stuff, but I haven't looked beacuse all their stuff is really spendy.
Sorry about the long post.
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Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
Forged pistons
You can buy forged pistons for a 300. Performance Automotive Wholesale sells a set of forged pistons, pins and rings for $330 in all popular oversizes. 390 pistons will fit, but fitting and working are two different things. The 390 slugs require at least 0.050 over, which makes the cylinder walls a little thin for regular use, way too thin for nitrous use.
All factory rods (until recently) are forged. If you add stronger bolts, fully prep, and shotpeen the rods they should be just fine. If you want a little more insurance you could have them cryo treated. This should cost less than $100, but will dramatically improve the fatigue strength of the rod. The primary stress on a rod comes from rpm, not power output.
All factory rods (until recently) are forged. If you add stronger bolts, fully prep, and shotpeen the rods they should be just fine. If you want a little more insurance you could have them cryo treated. This should cost less than $100, but will dramatically improve the fatigue strength of the rod. The primary stress on a rod comes from rpm, not power output.
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Senior User
Joined: Mar 2003
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From: Corvallis oregon
Forged pistons
I have heard a lot about cryogenics, would it really only cost about $100 to say, treat the crank and the rods?
Could that be a local thing, or do you think I might have to ship them someplace?
Could that be a local thing, or do you think I might have to ship them someplace?
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
Forged pistons
Probably about $100 for a set of rods. A friend of mine here does cryogenics and he charges around $4/pound. The cost varies quite a bit depending on how much you do because he has to cover the cost of the nitrogen rather it's a full load or not. I was there last week and he had an aluminum conecting rod there out of a SBC race engine. The rod had been through 8 rebuilds after cryo treating; the guy had to replace them every rebuild before. He finally broke the crank, which he didn't treat.
There are cryo places popping up everywhere now days, just make sure they are reputable.
There are cryo places popping up everywhere now days, just make sure they are reputable.
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