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Joined: Jun 2010
Posts: 150
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2010
Posts: 150 |
Hi.
What is the correct torque for the headbolts on the 490 engine?
Olle
1918/1919 490 Touring
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Joined: Dec 2008
Posts: 173
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2008
Posts: 173 |
There is no set torque for the head bolts, but a safe torque would be 55-60 ft. lbs. Anymore than that is risking stripping the threads in the block. If you replaced the head gasket don't forget the aluminum spray on the copper head gasket.
Cheers,
Gary
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Joined: Jan 2002
Posts: 1,623
ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Jan 2002
Posts: 1,623 |
I might even go a little easier than that, I always say 50-55 ft-lbs. I assume you are re-using original head bolts.
Then, when it's all together and running again, you will almost certainly have to re-torque the head bolts a couple of times, after half an hour or so of running time. They "stretch" or relax a bit, and you will find they have dropped to maybe 25 ft lbs, they might even let bubbles out the edges of the head gasket. Just re-torque until they stay at 50.
Chevy Guru
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
This is a perfect example of posting a question in several threads. We now have a thread under 12-28 and one here in 16-22. Both with the same question and different answers. Will see if this can right itself.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jan 2002
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ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Jan 2002
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I noticed this duplicate thread, too, after I had posted an answer on the other thread.
But it looks to me like we all gave him pretty much the same answer: 50-55 with old bolts, 55-60-65 on new ones.
I don't mean to minimize your main point that there is no need for duplicating the questions, though.
Chevy Guru
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Joined: Nov 2006
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ChatMaster - 2,000
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ChatMaster - 2,000
Joined: Nov 2006
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Olle, you also may ask Per-Ã…ke per-ake.larsson@telia.com about this. Here he is: https://vccachat.org/ubbthreads.php/users/6244/swedechevHe is really using his 490. 
Solan G, # 32797
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