hello

i need torque spec on 350 chevy ´74 and by torque spec i mean how much may i screw the bolt on the heads and intake.

Then it would be nice to see diagram of what bolt is first tident and the so on ... what bolt go first in and then so on.

with thanks that someone crack my secret code

David

 

stock bolts or aftermarket? Studs? What size?

Head bolts torque to 65-70 with 30wt oil as a lubricant. Tighten in 3 steps working from the center outward.

Intake manifold bolt torque not as crucial, 25-30 ft/lb is plenty. Again, use oil. Never install a bolt dry. Work from the inside out.

If you've got studs they're going to want more torque. Also you're going to want a different lubricant. Use whatever was supplied with your studs and torque them to the manufacturers spec. I think ARP 7/16" studs call for around 90 ft/lb. I'll check in the book today while I'm at the shop.

 

stock bolts , uhh i think ~ 14-17mm and plz dont ask in how much in ?/16 because i never got the hang around that tech.

just normal lubricunt oil? not grease?

 

yes reg motor oil, and or thread sealant if you are through or near a water passage.
The only other thing you use is the ARP lube that comes with them (ARP bolts/studs).

 

DO NOT use motor oil on the head bolt threads.

EVEY SINGLE head bolt goes into the water jacket, in a 350. Use non-hardening thread sealer on the threads, and underneath the bolt head; either Loctite PST (whatever they're calling it these days, it's their automotive pipe thread sealer with Teflon) or Permatex 300. NOT SILICONE.

Head bolt torque is 60-65 with stock bolts. Start at the center and work outwards in a circle. Too much torque will warp the head and cause the head gasket to blow between the center 2 cylinders. Tighten them in stages; like, to 25 ft-lbs, then to 45, then to 60, and then go back over it to 60 a couple of times. Make sure you take your reading while the bolt is actually moving. 70 ft-lbs with composition head gaskets is too much and will cause problems.

They're 5/8", BTW.

Intake manifold bolts need sealer on all but the 4 corner bolts, and should be around 30 ft-lbs; as always, start at the center and work outwards, and do them in steps like I described for the heads.