The Ford Barn - View Single Post - bolt torque difference iron block & Aluminum Head

40 Deluxe · 03-27-2020, 09:51 AM

As I remember, those are 5/16" bolts so the bolt itself is the limiting factor. 12-15 ft. lbs. should be OK in aluminum as spark plugs in aluminum heads are torqued to around 20 ft. lbs.

03-27-2020, 09:51 AM	#2
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,778	Re: bolt torque difference iron block & Aluminum Head As I remember, those are 5/16" bolts so the bolt itself is the limiting factor. 12-15 ft. lbs. should be OK in aluminum as spark plugs in aluminum heads are torqued to around 20 ft. lbs.