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Thread: Head bolt torque
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09-25-2021, 04:36 AM #15000 RPM
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Head bolt torque
My service manual says 30 Ft Lbs then a additional 90 degree turn for head bolt torque on my 225 pro max, is the way everyone is torquing there heads?
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09-25-2021, 06:43 AM #26000 RPM
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Sure someone with more experience will chime in... but I think that's for when using new bolts. I think you are prone to break some off if they are being reused. Seems like I've read a torque spec for used bolts. Hopefully someone will share. I have broken one off.
Bullet CC w/ 225 Promax - Sold
STV ProComp w/ 225 Promax
STV Procomp with 280
25 Liberator "The Battleship"
Blazer 650 Pro Tour
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09-25-2021, 06:48 AM #3
It is for new bolts. For used bolts I have always torqued to 35 lbs.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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09-25-2021, 07:21 AM #45000 RPM
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I don't have new bolts what would you torque used ones too?
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09-25-2021, 07:37 AM #55000 RPM
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35 LBS no extra turns?
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09-25-2021, 07:48 AM #6
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09-25-2021, 07:51 AM #75000 RPM
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Thanks everyone for help with this mornings project hopefully boating today!
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09-25-2021, 10:00 AM #8
Be sure to oil the threads.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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09-25-2021, 11:00 AM #95000 RPM
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Thanks Rock I will do that if you can help with my new post about combustion chamber size please do.
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09-25-2021, 02:04 PM #10Screaming And Flying!
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If you use new head gaskets make sure and recheck torque after running the motor. Generally they will stay stable after two or three heat cycles.
Last edited by Stoker boy; 09-25-2021 at 07:47 PM.
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09-25-2021, 05:25 PM #11Screaming And Flying!
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Streachy bolts........the 30 than 90/0 bolts are streach to yeald......I have re/used them...... but when taken down they seem losse.......they have a slash mark at the bottom of the bolt/thread......those are streachy bolts.........the ones to use are the early ones.......w/out the slash........30.... rod bolts..... 35 .....main bolts..... 40 head bolts......and when ya do the last head bolt..... is gives...... darn....break out the kit.......
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09-27-2021, 06:17 PM #125000 RPM
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Can you still buy the old head bolts or am I better off to install a stud kit over the winter? I have rechecked torque once I will again next time I run it.
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09-27-2021, 08:09 PM #13
They are around but studs sure are nice. If you have time and $$, then hard to argue with studs.
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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