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need help on thread size #2069257 05/08/16 11:58 AM 05/08/16 11:58 AM
Joined: Jun 2010 Posts: 85 europe W WBR OP member
WBR OP member W Joined: Jun 2010 Posts: 85 europe	I'm bolting my sb 421/w9 engine together after a little freshen up. lost threads on head under the bar that attaches the valve gear. I need to order helicoils but need verification on the thread size on the 8 middle ones. UNC 7/16? Used to metric... Street driven, 421 Sb, NA, 9.98/137

Re: need help on thread size [Re: WBR] #2069320 05/08/16 01:22 PM 05/08/16 01:22 PM
Joined: Oct 2010 Posts: 2,408 Ambridge, Pa. R rickraw top fuel
rickraw top fuel R Joined: Oct 2010 Posts: 2,408 Ambridge, Pa.	Mine are 7/16-14. Torque bolts to 65# with threaded inserts. 60# with tapped threads. This is specs from jesel's. Use thread sealer on the bolts that are over the intake runner.

Re: need help on thread size [Re: WBR] #2069329 05/08/16 01:30 PM 05/08/16 01:30 PM
Joined: Jun 2010 Posts: 85 europe W WBR OP member
WBR OP member W Joined: Jun 2010 Posts: 85 europe	Thank you very much!!! Street driven, 421 Sb, NA, 9.98/137

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