Torque specs for GM Vortec Heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gysgtc · 03-18-2011, 05:45 PM

Does anyone know what the torque specs for GM Vortec Heads are? I bought a rebuit 355 with new vortec heads on it. The PO can't remember if he torqued the heads. I have read all different things on the net. Thanks. Wayne

clinebarger · 03-18-2011, 09:32 PM

GM service manual.."Torque angle method"

First Pass Torque all bolts to 22 ft. lbs.
Torque Short Bolts an additional 55°
Torque Medium Bolts an additional 65°
Torque Long Bolts an additional 75°

Easy "tried & true" method

1st pass 25 ft. lbs.
2nd pass 45 ft. lbs.
3rd pass 65 ft. lbs.

gysgtc · 03-19-2011, 06:23 AM

Thanks Clinebarger. I couldn't find any torque values without doing the so many degree afterwards.

03-18-2011, 05:45 PM	#1
gysgtc Registered User Join Date: Apr 2010 Location: Sutton, WV Posts: 340	Torque specs for GM Vortec Heads Does anyone know what the torque specs for GM Vortec Heads are? I bought a rebuit 355 with new vortec heads on it. The PO can't remember if he torqued the heads. I have read all different things on the net. Thanks. Wayne

03-18-2011, 09:32 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Torque specs for GM Vortec Heads GM service manual.."Torque angle method" First Pass Torque all bolts to 22 ft. lbs. Torque Short Bolts an additional 55° Torque Medium Bolts an additional 65° Torque Long Bolts an additional 75° Easy "tried & true" method 1st pass 25 ft. lbs. 2nd pass 45 ft. lbs. 3rd pass 65 ft. lbs.

03-19-2011, 06:23 AM	#3
gysgtc Registered User Join Date: Apr 2010 Location: Sutton, WV Posts: 340	Re: Torque specs for GM Vortec Heads Thanks Clinebarger. I couldn't find any torque values without doing the so many degree afterwards.



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