foose04

iTrader: (3)

I sent a e-mail over to ARP asking about L19's for pre-03 LS engines. My response from ARP.

"Rob,

We are now making them out of CA625 material. It is a superior material and more durable than L19. The part number is 234-4313. L19 is a custom order.

Best regards,

Alan Nichols
Sales & Technical"


These are not listed in the 2011 ARP catalog. My research:

Standard ARP 8740 chromoly Fastener Tensile Strength 190,000-200,000psi (Preload lbs/Clamp force= 13,470lbs)

L19 is 220,000-230,000psi (Preload lbs/Clamp force= 15,060lbs)

Custom Age 625+ is 270,000-280,000psi (Preload lbs/Clamp force not listed on site)

In comparison, 1/2 studs in ARP 8740 are rated at 18,515 Preload lbs/Clamp force.


Other good info. PER ARP installation instructions on LS Engines, 8740 is to be TQ'd to 80lb's. L19 is 90lb's, Custom Age is 100lb's.

Looks like a new option for big boosters looking to stick with a 7/16 stud and be close to the same playing field as the 1/2 stud setups. Your looking at around $350 give or take for ARP 8740, the best i've found on Custom Age 625 is $750 give or take. I'm not sure what the P/N is for the 04+.

Source for my info:

ARP 8740 for 03 and earlier LS:
http://arpinstructions.com/instructions/234-4316.pdf

ARP2000/L19 ONLY for 04 and newer:
http://arpinstructions.com/instructions/234-4319.pdf

CA625/Custom Age 625 03 and earlier:
http://arpinstructions.com/instructions/234-4313.pdf

Their add is jack up saying 1993 lol, that's a early LS!

Atomic

iTrader: (42)

Interesting....is that what they marketed as their "pro" line?

foose04

iTrader: (3)

Nope:

"These Pro series studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 190,000 psi."

Gadgetized

iTrader: (9)

Interesting. So in other words you are planning more boost.

foose04

iTrader: (3)

Got a few things waiting for me when I get home from this deployment....

bmd_CL

iTrader: (2)

i have a feeling you might be pulling the 4.8 lol? or are you going to try and break single digits with it?

f-22

I hope I'm one of those things waiting for you when you get back. We have some unfinished bizness to get to.

smokeshow

iTrader: (16)

You gonna hop out of a cake to welcome him back?

CC05

iTrader: (2)

Am I reading right that the Big Boy's are rated at ~100K more than the Pro's? Does that make sense?






It's 3:31 a.m. Just ingore my bullshit if I've got it backwards.

Three6GMC

iTrader: (11)

That's pretty cool didn't know about these.