another rod question
Thread Starter
Teching In
Joined: Aug 2015
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another rod question I have searched everywhere for a 6.275 h beam rod for my 4.8 and as you probably already know it does not exist.
I've read a 6.300 will work with a piston that has its pin location changed. Both weisco and diamond gave me decent prices on a set of pistons to allow the 6.300 rods to work.
Is this my only option to run a h beam rod?
I have stock gen iv rods with floating pistons I considered using them but the shops I've called said they can't be reconditioned and I assumed they could be so I didn't bother to number them after I took them out. But I honestly want to use h beam rods and I'm stuck on both callies and lunati
I've read a 6.300 will work with a piston that has its pin location changed. Both weisco and diamond gave me decent prices on a set of pistons to allow the 6.300 rods to work.
Is this my only option to run a h beam rod?
I have stock gen iv rods with floating pistons I considered using them but the shops I've called said they can't be reconditioned and I assumed they could be so I didn't bother to number them after I took them out. But I honestly want to use h beam rods and I'm stuck on both callies and lunati
Wrong section, but yes, a custom piston will get you what you want. Why spend all this time dicking around with the 4.8 crank? Just get a standard LS 3.622 crank. Pistons and rods will be off the shelf items at that point. If you are willing to throw money around for custom pistons and H-beam rods, why not make it easy on yourself and buy off the shelf parts and a good used stock crank? You'll save yourself a few bucks and get some extra cubes too.
Thread Starter
Teching In
Joined: Aug 2015
Posts: 24
Likes: 0
Wrong section, but yes, a custom piston will get you what you want. Why spend all this time dicking around with the 4.8 crank? Just get a standard LS 3.622 crank. Pistons and rods will be off the shelf items at that point. If you are willing to throw money around for custom pistons and H-beam rods, why not make it easy on yourself and buy off the shelf parts and a good used stock crank? You'll save yourself a few bucks and get some extra cubes too.
What do you mean they can recondition them?
Probably means they can't resize the big end because it is a cracked cap design. You can't resize them because you can't mill the two mating surfaces to provide material to make it round again. Numbering them is inconsequential.
You can resize the rods, if that is even needed. Usually it's not unless you install ARP bolts which may or may not deform the housing bore. If it does, you just have to have the bore honed out about .002" and use a bearing for the oversized bore. Clevite makes one; PN 1776-P. It's actually quicker this way.
I built the engine in my Trans Am with LS3 rods. They weren't numbered and I had no idea what cylinder they came from, but it doesn't matter. As long as the bearing clearances are checked and the housing bores are within tolerance, they can go in any cylinder you want.
It sounds to me like the shop you talked to is not very experienced.
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Verdad Gallardo While you're at it, you may want to drop the crank off and have them check the clearances with a mic and dial bore gauge. It's a lot more accurate that way than with plastigage.
What are your power goals? It's not really power that kills them, it's RPM. I'd just use the stock Gen IV rods and bolts. Tons of people are running over 800 at the tire with those rods and bolts. You don't need to know what cylinder they are from, just get it balanced. Just my .02