Torque'n the heads RIGHT NOW!!!! Need help ASAP!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMC910 · 06-30-2002, 05:20 PM

I'm currently installing heads on the 350, finally switching the 305 heads to 350 ones. What should all the bolts be torqued to? I am using the old bolts again, do I have to torque them higher because of threads stretching?

What is the procedure for tightening the rockers, are they all at a specific torque?

Also, My pistons have stamped on them 345NP .030 So I know its 30 over, does anyone recognize the 345NP? They are a flat top piston but I would like to know the compression ratio.

Thanks for the help

P.S. I really like the new board!!

06-30-2002, 05:20 PM	#1
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Torque'n the heads RIGHT NOW!!!! Need help ASAP!!! I'm currently installing heads on the 350, finally switching the 305 heads to 350 ones. What should all the bolts be torqued to? I am using the old bolts again, do I have to torque them higher because of threads stretching? What is the procedure for tightening the rockers, are they all at a specific torque? Also, My pistons have stamped on them 345NP .030 So I know its 30 over, does anyone recognize the 345NP? They are a flat top piston but I would like to know the compression ratio. Thanks for the help P.S. I really like the new board!! __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph



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