Carpenter Head Bolt Torque Spec?

SpazOnaR3

.060 Over

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Jul 21, 2020

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144

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SV Arizona

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'04 R3 LSR

• Jul 5, 2022

• #1

I'm a bit of a numpty, and misplaced my spec sheet... does anyone recall what the final torque spec is for the Carpenter head bolts?

 

R-III-R Turbo

Mine is the biggest :)

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Oct 12, 2010

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2,381

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Ireland

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2472cc Supercharged Carpenter Rocket III Stroker

• Jul 6, 2022

• #2

Iirc I just used the stock spec, from the manual. It's been a while though. Best call them and be sure

 

RobWhi

Supercharged

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Oct 16, 2019

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229

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Brisbane

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2012 Rocket Roadster

• Jul 6, 2022

• #3

Unless you are using aftermarket bolts like ARP the spec will be the same as stock

 

SpazOnaR3

.060 Over

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Jul 21, 2020

Messages

144

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SV Arizona

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'04 R3 LSR

• Jul 6, 2022

• #4

Yes, they are aftermarket bolts sourced from ARP for Carpenter Racing. They are a custom offering in length for certain... I cannot speculate on the alloy, other than it is a chromoly alloy of some sort... given the research involved I wouldn't try an off the shelf item as a substitute for the bolts directly from them.

I called and got the numbers; I'll post them here as a reference.

3-step torque in factory sequence:
1) 20ft/lb
2) 40 ft/lb
3) 65 ft/lb

 

RobWhi

Supercharged

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Oct 16, 2019

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229

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Brisbane

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2012 Rocket Roadster

• Jul 6, 2022

• #5

Do they cast their own cyl head?