ARP Bolts on Aluminum LS engines
05-07-2012, 01:28 PM
#1
ARP Bolts on Aluminum LS engines Who has used ARP bolts on their Aluminum LS build? Besides head bolts, bolts such as cam retainer, oil pump, timing cover etc. The reason I ask is because their Tq specs are quite higher than GM.
ARP will NOT tell me if they are safe for Aluminum or not.
ARP will NOT tell me if they are safe for Aluminum or not.
05-07-2012, 08:00 PM
#6
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Cam bolts, head bolts and crank bolt here. And I see APR bolts as a more precise stretch vs conventional GM bolts. Especially when using the torque lube and cleaning the threads prior to install.
I wouldn't worry about pulling the threads out of you follow the recommended procedures. I'd gather that ARP has spend their R&D time/money on testing these bolts on aluminum blocks.
I wouldn't worry about pulling the threads out of you follow the recommended procedures. I'd gather that ARP has spend their R&D time/money on testing these bolts on aluminum blocks.
05-07-2012, 08:09 PM
#7
Cam bolts, head bolts and crank bolt here. And I see APR bolts as a more precise stretch vs conventional GM bolts. Especially when using the torque lube and cleaning the threads prior to install.
I wouldn't worry about pulling the threads out of you follow the recommended procedures. I'd gather that ARP has spend their R&D time/money on testing these bolts on aluminum blocks.
I wouldn't worry about pulling the threads out of you follow the recommended procedures. I'd gather that ARP has spend their R&D time/money on testing these bolts on aluminum blocks.
Did you use the cam retaining plate bolts? Torqued to 24ft? Did you use lube or loctite?
ARP wouldnt tell me if they were designed to be used with Aluminum or not. In fact he kind of tried to avoid the question by stating "he doesnt know how strong the aluminum is".
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05-07-2012, 08:21 PM
#8
ARP's stated torque specifications are based on 75% of each fastener's yield strengh with ARP's lubricant, which presumably reduces the friction component implicit in the torque value. Since ARP produces fasteners with varous tensile strengths (and yield strengths) the specifiations are fastener-specific. So, it does not appear the ARP's specifications vary based on the materal being fastened.
05-07-2012, 08:32 PM
#9
ARP's stated torque specifications are based on 75% of each fastener's yield strengh with ARP's lubricant, which presumably reduces the friction component implicit in the torque value. Since ARP produces fasteners with varous tensile strengths (and yield strengths) the specifiations are fastener-specific. So, it does not appear the ARP's specifications vary based on the materal being fastened.
Junk block anyone?
05-07-2012, 10:22 PM
#10
My Alum block motor is full of ARP hardware.(head studs, water pump, cam and retainer...etc.) I used loctite on the cam and cam retainer plate bolts. Taking no chances there. Stock GM tq specs on the retainer if i remember correctly.
They were not the countersunk type bolts on the retainer, was the older type.
They were not the countersunk type bolts on the retainer, was the older type.
Last edited by Steve01SS; 05-07-2012 at 10:27 PM.
