|
502 head bolts torque
Morning guys...puting heads on my 502 and found on internet torque spec..They sey longer bolts torque at 78 ft-lbs and shorter once 65ft-lbs is this ok since my is 6 psi boost?Thank you
|
Originally Posted by Zole
(Post 4856809)
Morning guys...puting heads on my 502 and found on internet torque spec..They sey longer bolts torque at 78 ft-lbs and shorter once 65ft-lbs is this ok since my is 6 psi boost?Thank you
|
Originally Posted by SB
(Post 4856810)
What headbolts ? Ie: whose (manufacturer) and what part# ?
|
Originally Posted by Zole
(Post 4856812)
Morning my good SB..Part number i did not know they have.But i took a caliper and messured thicknest it is 0.043 on threads..does this help
Manufacturer and model determines the torque value. |
Edit in:
I know you’re from another country and this will probably be expensive to get there, but I’m willing to bet most of us would say to get ARP head bolts for a supercharged 502. Share a pic of your bolts, just in case you may have these. |
Originally Posted by SB
(Post 4856814)
Edit in:
I know you’re from another country and this will probably be expensive to get there, but I’m willing to bet most of us would say to get ARP head bolts for a supercharged 502. Share a pic of your bolts, just in case you may have these. |
Originally Posted by Zole
(Post 4856816)
Will do SB..Photo comming wery soon not in garage at the moment.And as allways thank you
https://cimg0.ibsrv.net/gimg/www.off...e437bfb604.jpg https://cimg1.ibsrv.net/gimg/www.off...9db6eed0df.jpg https://cimg2.ibsrv.net/gimg/www.off...8d4331921d.jpg https://cimg4.ibsrv.net/gimg/www.off...2b3742b542.jpg https://cimg5.ibsrv.net/gimg/www.off...cecfdf8bdc.jpg https://cimg7.ibsrv.net/gimg/www.off...1a7e2b5e91.jpg https://cimg9.ibsrv.net/gimg/www.off...d3756be008.jpg https://cimg0.ibsrv.net/gimg/www.off...8ea0c6c140.jpg Pictures SB |
Posted pictures of bolts
|
The bolts look like ARP, did they also have washers?
|
Originally Posted by AllDodge
(Post 4856835)
The bolts look like ARP, did they also have washers?
|
Originally Posted by Zole
(Post 4856838)
Sorry AllDodge what are washers?
https://www.summitracing.com/parts/ARP-135-3601 and if unable to see, look up ARP 135-3601 you will see the bolt set and washers |
Originally Posted by AllDodge
(Post 4856841)
Round metal flat pieces that go under the bolt head. hope you can see this link
https://www.summitracing.com/parts/ARP-135-3601 and if unable to see, look up ARP 135-3601 you will see the bolt set and washers |
OK, SB's last comment was it would be best to use ARP bolts (they come with washers) for your motor.
For the moment pay no attention to the ARP bolt set I previously mentioned The bolt length in your pics are about 3.5 inch, so both are short bolts, and the torque spec you found for a 502 seems a little light Do you have 3 different lengths of bolts or just 2 ? Also what year is your motor, or better yet if you have a serial number? |
Originally Posted by AllDodge
(Post 4856844)
OK, SB's last comment was it would be best to use ARP bolts (they come with washers) for your motor.
For the moment pay no attention to the ARP bolt set I previously mentioned The bolt length in your pics are about 3.5 inch, so both are short bolts, and the torque spec you found for a 502 seems a little light Do you have 3 different lengths of bolts or just 2 ? Also what year is your motor, or better yet if you have a serial number? https://cimg1.ibsrv.net/gimg/www.off...e877ada5e3.jpg https://cimg2.ibsrv.net/gimg/www.off...04bb3487ff.jpg https://cimg4.ibsrv.net/gimg/www.off...e593938b0e.jpg https://cimg5.ibsrv.net/gimg/www.off...2cdea4ab85.jpg https://cimg7.ibsrv.net/gimg/www.off...21be3ff4ff.jpg Two diffrent lenght |
If you want to be certain post a picture of the head of the bolt but I am almost certain that those are stock head bolts. I would torque them all to 75 which is the torque spec for the 600hp Mercruiser 502. That is with oil on the threads.
|
OK, looks like Gen VI block and 088 heads all good.
For factory bolts the torque pattern and spec is in pic below https://cimg9.ibsrv.net/gimg/www.off...d198c42a76.jpg If you go with ARP bolts, then the max torque is 70 FT LB on all. Use same pattern to torque in passes but only go to 70. Bolts listed above is what you would use. Also the kit comes with 4 short, 4 long and 12 in the middle. The long ones are not much longer then the middle and go only in spots 14 and 15 on each side |
Originally Posted by AllDodge
(Post 4856851)
OK, looks like Gen VI block and 088 heads all good.
For factory bolts the torque pattern and spec is in pic below https://cimg9.ibsrv.net/gimg/www.off...d198c42a76.jpg If you go with ARP bolts, then the max torque is 70 FT LB on all. Use same pattern to torque in passes but only go to 70. Bolts listed above is what you would use. Also the kit comes with 4 short, 4 long and 12 in the middle. The long ones are not much longer then the middle and go only in spots 14 and 15 on each side |
Originally Posted by BillK
(Post 4856850)
If you want to be certain post a picture of the head of the bolt but I am almost certain that those are stock head bolts. I would torque them all to 75 which is the torque spec for the 600hp Mercruiser 502. That is with oil on the threads.
https://cimg6.ibsrv.net/gimg/www.off...f7a640e406.jpg https://cimg7.ibsrv.net/gimg/www.off...123ada3f65.jpg |
Originally Posted by Zole
(Post 4856853)
So go with the spec above..Max torq 92ft-lbs on all bolts
It says 89ft-bs on short bolts and 92ft-lb on long. This is if you use the ones you have now. SB said it would be better to use ARP with your blower |
Originally Posted by BillK
(Post 4856850)
If you want to be certain post a picture of the head of the bolt but I am almost certain that those are stock head bolts. I would torque them all to 75 which is the torque spec for the 600hp Mercruiser 502. That is with oil on the threads.
Are you reusing bolts or new bolts? |
Originally Posted by AllDodge
(Post 4856856)
No, no, no
It says 89ft-bs on short bolts and 92ft-lb on long. This is if you use the ones you have now. SB said it would be better to use ARP with your blower |
Originally Posted by GLENAMY 242SS
(Post 4856857)
Also oil the bottom of the shoulder on the head of the bolt, where it contacts the head.
Are you reusing bolts or new bolts? |
| All times are GMT -5. The time now is 10:01 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.