Gen 4 rod bolts help please
03-18-2019, 06:36 AM
#1
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Gen 4 rod bolts help please Hopefully it’s ok to post in this section. I’m building a gen 3 lq9 370. But I’m using gen 4 full floating rods (hence this section) what ARP rod bolts do I need for gen 4 cracked rods? I see some that say LS1 crack rod and some that say LS2 cracked rod LS3 cracked rod’ but they are all different part numbers. I am assuming the LS one crack rod bolts will not work because they’re for a gen 3.
03-18-2019, 08:18 AM
#3
If you are wanting ARP, a quick phone call to them should nearly guarantee the correct answer. I found conflicting #'s when researching their pro series head studs for my 6.2L LS3, so called them up, and got exactly what I was after with good clarity and differences.
03-18-2019, 09:37 AM
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If you are wanting ARP, a quick phone call to them should nearly guarantee the correct answer. I found conflicting #'s when researching their pro series head studs for my 6.2L LS3, so called them up, and got exactly what I was after with good clarity and differences.
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03-18-2019, 12:52 PM
#8
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You are probably right to go direct to be sure of the real deal, but I would bet if you deal with a company like TSP or any of the big names in the performance biz who like to protect their reputations you should still get the real thing.
03-18-2019, 03:38 PM
#11
That's because you can't traditionally resize a fractured-cap rod. Best you can do is to machine it opened 0.001" or 0.002" over on the bearing bore ID, then get oversized OD rod bearings. My Gen IV rod big ends were honed, so they now measure almost 0.001" over. So, I bought a set of King bearings 0.002" over, and using only one of them per shell to get exactly 0.001" over on the OD, to hit the factory spec crush amount. Probably being too nuts over it, but don't want to spin a bearing on a cold Michigan winter startup.
03-22-2019, 08:10 PM
#12
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That's because you can't traditionally resize a fractured-cap rod. Best you can do is to machine it opened 0.001" or 0.002" over on the bearing bore ID, then get oversized OD rod bearings. My Gen IV rod big ends were honed, so they now measure almost 0.001" over. So, I bought a set of King bearings 0.002" over, and using only one of them per shell to get exactly 0.001" over on the OD, to hit the factory spec crush amount. Probably being too nuts over it, but don't want to spin a bearing on a cold Michigan winter startup.
I have seen this procedure done numerous times, when replacing original connecting rod bolts with ARP "8740" or "2000" alloy hardware with spec'd ARP lubricant.
I do not recommend installing ARP 2000 connecting rod bolts and torquing them to the specified 45 Ft/Lbs (0.0065"- 0.0070" stretch) without having performed "Big end resizing". Doing so will distort the connecting rod.
Of course people do actually go ahead and do it anyway... IF some how I had no choice in the matter... I would torque the ARP hardware to the GM torque spec with 30 weight engine oil.
