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Knuck head altered for pan cylinders....

Moderators: Curt!, Pa



Posts: 15

Joined: Mon Sep 10, 2007 2:04 pm

Location: SFV, California

Post Wed Jun 18, 2008 1:22 pm

Knuck head altered for pan cylinders....

The previous owner of my '47 did the alteration on the heads to use Panhead cylinders, which included moving one bolt hole. That's fine, but, in the process, altered the thread pattern by inserting helicoils after slightly enlarging the existing bolt holes. This was done so Panhead head bolts could be used . What would the fix be? And would it change the proper torque specs for the head bolts once done? Thanks, Bones


Posts: 1588

Joined: Tue Nov 27, 2007 2:29 am

Post Wed Jun 18, 2008 2:52 pm

Re: Knuck head altered for pan cylinders....

it rather sounds to me, as though the 'fix' is to leave it that way. Pan cylinders on a knuckle is a well-known modification for improved reliability, after all.

Quite how you would reduce the bolt size, which is what you appear to be asking, I couldn't say, unless by welding the hole and re-drilling, which sounds like a lot of work for no real useful end.
Shoot, a man could have a good weekend in Dallas with all that stuff...

Lee W

Posts: 149

Joined: Sat Sep 23, 2006 8:58 pm

Location: Carver, MN

Post Thu Jun 26, 2008 11:36 am

Re: Knuck head altered for pan cylinders....

I agree, if the threads are good now, best to leave them. If the helicoils were properly installed they will take as much or more torque than stock. 65 Ft Lbs should not be a problem, but remember I said "if the helicoils were properly installed." You might be safer down around 55.

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