Re: [AMC-list] 195.6ohv, ARP studs and head torque

[Frank Swygert <farna@xxxxxxx>]

I'm glad you got these results! Check it again in another 8K miles just 
to be sure (or when you check lifter adjustment). You get 15-16K on it 
and I'll be satisfied. The only clincher here may be that cooling mod. 
I'd say it MUST be in place to use the studs an leave the head alone. 
Good thing it's easy to do! Should even be able to do it with the head 
on, but the water pump would have to come off. There would be some 
benefit from just having the cooling mod, but may as well pull the head 
and use studs too. They don't have to be ARP studs, standard grade 8 
studs from a fastener supply should be just as good. The ARP studs are 
slightly harder than grade 8, may not need but a bit over factory hot 
torque (I'd go 70 ft/lbs anyway).

-----------------------
Date: Sun, 5 Dec 2010 16:07:05 -0800

From: tom jennings <tomj@xxxxxxx>

OK, 8000 miles on the motor, pulled the valve cover to check bolt torque 
(i'd only checked some of the outside ones earlier) and no re-torque was 
needed -- I'd socked them up to 75 ft/lbs at assembly, and the wrench 
just clicked when set to 70 ft/lbs. When set to 75 turned about they 
moved 1/16 turn, just barely. There's almost no stiction from the ARP 
lube and nuts-on-studs, not those stupid bolts. In short, the head studs 
did not loosen one bit since the engine was assembled this past spring
So as far as I'm concerned the 195.6 OHV head retorquing mystery is 
solved -- *head cooling design flaw, easily fixed*, and ARP head studs, 
cold-torqued to 75.

No way I'd ever assemble a 195.6 OHV with headbolts again. Worth every 
dime for the studs.

--
Frank Swygert
Publisher, "American Motors Cars"
Magazine (AMC)
For all AMC enthusiasts
http://www.amc-mag.com
(free download available!)

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