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X25 · 11-03-2015, 05:05 AM

Found some data (for Mopar cars; shouldn't matter):
http://www.allpar.com/fix/body/fasteners.html

The SS coil from helicoil (that threads to the aluminum block) is 3/8 - 16. So, assuming the coil acting like a bolt, finding the torque values for 3/8 - 16 bolt might be a good guidance.

SAE Grade 5
Size Cast Iron Aluminum
Dia - tpi N•m Ft-lb N•m Ft-lb
3/8 - 16 40 30 25 20

SAE Grade 8
Size Cast Iron Aluminum
Dia - tpi N•m Ft-lb N•m Ft-lb
3/8 - 16 55 40 40 30

Well, judging from this table, 21 lb.ft should be OK.

11-03-2015, 05:05 AM	#488
X25 Drives: '16 C7 Z51 Join Date: May 2012 Location: Redmond, WA Posts: 3,056	Found some data (for Mopar cars; shouldn't matter): http://www.allpar.com/fix/body/fasteners.html The SS coil from helicoil (that threads to the aluminum block) is 3/8 - 16. So, assuming the coil acting like a bolt, finding the torque values for 3/8 - 16 bolt might be a good guidance. SAE Grade 5 Size Cast Iron Aluminum Dia - tpi N•m Ft-lb N•m Ft-lb 3/8 - 16 40 30 25 20 SAE Grade 8 Size Cast Iron Aluminum Dia - tpi N•m Ft-lb N•m Ft-lb 3/8 - 16 55 40 40 30 Well, judging from this table, 21 lb.ft should be OK. __________________ '16 Corvette C7 Z51 1LT (Build Thread) '14 AGM 1SS 1LE [COTW 11/17/14] (Build Thread) (SOLD) '13 Mazda MX-5 Club (Build Thread) '17 RAM 1500 Crew Cab 4x4 Night Edition '15 Nissan Rogue S AWD