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45 Head replacement

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flathead1943

Posts: 53

Joined: Sat Jul 23, 2011 7:22 pm

Post Mon Sep 12, 2011 5:27 pm

45 Head replacement

Planning on doing some work on my WLC this winter. and the front head has a few broken fins. Is there a difference in performance if one was to switch to WLD heads to increase compression ratio. ??? Will they fit??? or not worth it.
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RUBONE

Posts: 380

Joined: Fri Nov 30, 2007 7:24 pm

Post Mon Sep 12, 2011 5:49 pm

Re: 45 Head replacement

WLDs just used standard #6 heads. Same as post war WLs. Yes they fit. Yes you will notice a little increase in power. And WLC heads can be made into WL/WLD heads easily! Have a friend with a mill?
Robbie
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flathead1943

Posts: 53

Joined: Sat Jul 23, 2011 7:22 pm

Post Mon Sep 12, 2011 6:57 pm

Re: 45 Head replacement

So what are you trying to say just mill a few thou off the head to increase compression ??? If yes how many thou
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Pa

Site Admin

Posts: 4655

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Mon Sep 12, 2011 8:41 pm

Re: 45 Head replacement

I don't know off hand how much you can take off but it can be calculated by the cc / volume using a calibrated baby bottle or other measuring devise and liquid. Plug the sparkplug holes and fill heads to leveled gasket surface. Dump each head into the measuring vessel. Now you know the volume of each. Skin cut head gasket surfaces to volume required. Doing the skin cutting in this manner eliminates differences in front and rear head combustion chambers. Just don't get carried away and remove to much material. Check volume often.
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dalaymond

Posts: 304

Joined: Mon Oct 25, 2004 12:01 am

Location: Jonesville, Louisiana, USA

Post Tue Sep 13, 2011 6:58 am

Re: 45 Head replacement

In the 45 Power booklet, it says to mill off 0.12".
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Hopper

Posts: 35

Joined: Wed Jan 20, 2010 9:52 pm

Post Wed Sep 21, 2011 8:59 pm

Re: 45 Head replacement

I milled 7/64" off the stock heads on my WLA. (About .109")
That was the figure the old timers all quoted.
Works just fine.
A little relieving of the ports and the the barrels between valve and bore helps take full advantage of the compression bump.
If I was doing it again I would try the .120" and check valve clearance to heads with clay etc just in case.

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