Sheet Metal Intake Manifold Torque for Boost

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Dec 12, 2010 | 12:12 PM

ke6507

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Sheet Metal Intake Manifold Torque for Boost

I have a sheet metal intake on my LS3 and have torqued the intake down to 88 in-lbs. I will be running with 12lb boost. Is there a higher torque I should be using?

Dave

Dec 12, 2010 | 02:11 PM

rlwjr1

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Torque is based on the size of the fastener.

http://www.portlandbolt.com/technica...que-chart.html

Always use the spec the manufacturer recommends

Dec 12, 2010 | 06:07 PM

ke6507

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Quote:

Originally Posted by rlwjr1

Torque is based on the size of the fastener.

http://www.portlandbolt.com/technica...que-chart.html

Always use the spec the manufacturer recommends

I also thought it was based on the type of materials that were being attached (plastic to metal. AL to AL, Steel to AL, etc.)? I ask the question because I'm not attaching the factory composite intake to AL heads and I also thought GM had different settings for the LSA. I used the factory torque settings with a higher grade fastner (ARP bolts) and had to go back 4 times to get all bolts to hold the correct factory setting. My guess is this is due to the stiffer substraight and ARP bolts. I'll stay with the factory setting.

Thanks.

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