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#1
08-24-2015, 10:07 PM
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4130 connecting rods???
Are any 4130 rods still available?
Looking for something a little better than the 5140 i have found. |
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#2
08-24-2015, 10:27 PM
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Competition Products still has the RPM 4340 H-beams for $349.95.
I do know that RPM has other I beams available for Pontiac, but I don't know the specifics. http://www.competitionproducts.com/R.../#.VdvRJXWzaM8 Nate
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 1970 "Real" Judge RAIII 4-speed, Atoll Blue w/painted white top. Mild RAIV headed 400 motor in now. |
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#3
08-25-2015, 01:20 PM
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I actually am a small dealer for RPM and have the 4340 H and I beam rods on hand amongst many other rods and cranks but this project doesn't require a 4340 rod.
RPM only has 4130 for sbf and sbc currently..... They did a few runs of them a year or so ago for a Pontiac parts supplier but wasn't enough demand so the dropped them. Might just have to go with the 5140 rods. |
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#4
08-25-2015, 01:33 PM
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Quote:
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Karl 
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#5
08-25-2015, 01:41 PM
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The 4340's are not much higher than the 5140's. So isn't the extra margin of safety worth a hundred bucks or so ?
I think the H-beams are also lighter, which is a plus. Some RPM H-beams and Auto-Tec pistons will make a good, light combo, which is hard to beat, for the price. IMO. And, you can have the pin lowered, at no extra cost, to get closer to zero deck, rather than cutting so much off the block. You also can have the advantage of the thin rings. All these things should be worth the small extra cost, to anyone who understands the advantages.  Also, keep in mind the problems that Cliff noted, with the 5140 rods. 
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#6
08-25-2015, 05:49 PM
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My price for 5140 vs 4130 is about the same.
4340 price difference is about what I charge for a basic 3 angle valve job. I was fortunate enough to up sell new rods after explaining to the customer it not a Mopar LOL |
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#7
08-26-2015, 07:20 AM
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When I had Tomahawk Performance I was able to get the 4130 rods as a special order but had a minimum number of sets to order. I am not sure if they are still available or not. They were popular and a good rod never had a complaint.
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Tim Corcoran |
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#8
08-30-2015, 10:33 PM
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I think those were the rods I was looking for.....
I remember they looked well made |
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#9
08-31-2015, 08:28 AM
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Quote:
 . There has to be a minimum interference fit between the rod and pin. Also with the ultra light pins available now, I would not use a press fit application rod. One has to remember that this is a replacement type application and intended with a thick pin that does not have a propensity to flex with a long stroke. That being said, I have used quite a few sets of the 5140s and have had no problems with the intended use of a stock type upgrade.
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 1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
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