The Ford Barn

robert dick · 10-26-2012, 01:49 PM

i'm going to put a set of stock 59 series heads on a 59ab block with an L100 cam in it, will the heads need to be cut using this cam. At the present time it is not possible for me to turn the engine over to use the aluminum ball method of checking.

Ol' Ron · 10-26-2012, 04:49 PM

YES!! the net lift of the L-100 is .360 and it's wise to have .050" clearance. I put this in a angle fixture and cut the clearance at a 5 degree angle. That way you don't remove much material. Any shop with a Bpt milling machine can do it. I use an i5/8 shell mill.
I usually mill the heads for .050" piston clearance before I do this. Might as well do it right.

ford3 · 10-26-2012, 05:10 PM

ole ron is right, but i really suggest you get the engine where you can turn it over, put a head on with out a head gasket, turn engine over two full turns, if the head doesnt lift your fine, the head gasket is around 0.50", if it rises use a feeler gauge to see how much the head lifted, that is the mimimun depth of the fly cutdont guess, do it right or you will be sorry if you bend a valve or two, turn engine over

JWL · 10-27-2012, 04:38 AM

No, you will not have to flycut if the heads are factory stock.

Russ/40 · 10-27-2012, 12:27 PM

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Depends, have you replaced any valve seats? If so your valve train could be a lot higher than stock, and you could have significant interference. Been there done that. Be careful. Also, a stock head does not mean a head that was never surfaced.

10-26-2012, 01:49 PM	#1
robert dick Senior Member Join Date: Sep 2010 Location: massachusetts Posts: 317	need to fly cut heads?? i'm going to put a set of stock 59 series heads on a 59ab block with an L100 cam in it, will the heads need to be cut using this cam. At the present time it is not possible for me to turn the engine over to use the aluminum ball method of checking.

10-26-2012, 04:49 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,985	Re: need to fly cut heads?? YES!! the net lift of the L-100 is .360 and it's wise to have .050" clearance. I put this in a angle fixture and cut the clearance at a 5 degree angle. That way you don't remove much material. Any shop with a Bpt milling machine can do it. I use an i5/8 shell mill. I usually mill the heads for .050" piston clearance before I do this. Might as well do it right.

10-26-2012, 05:10 PM	#3
ford3 Senior Member Join Date: Oct 2012 Location: oroville calif. Posts: 1,453	Re: need to fly cut heads?? ole ron is right, but i really suggest you get the engine where you can turn it over, put a head on with out a head gasket, turn engine over two full turns, if the head doesnt lift your fine, the head gasket is around 0.50", if it rises use a feeler gauge to see how much the head lifted, that is the mimimun depth of the fly cutdont guess, do it right or you will be sorry if you bend a valve or two, turn engine over

10-27-2012, 04:38 AM	#4
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: need to fly cut heads?? No, you will not have to flycut if the heads are factory stock.

10-27-2012, 12:27 PM	#5
Russ/40 Senior Member Join Date: May 2010 Location: Santee, California Posts: 3,505	Re: need to fly cut heads?? Sponsored Links (Register now to hide all advertisements) Depends, have you replaced any valve seats? If so your valve train could be a lot higher than stock, and you could have significant interference. Been there done that. Be careful. Also, a stock head does not mean a head that was never surfaced.