model A and model B lifters I wander if some one can tell me if I can use vave lifter from a model (A) in to a model (B) camshaft anny help will bi Apreciated thanks Jose.:p
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Re: model A and model B lifters Check out Vince Falter's website, (fordgarage.com) in the index, go down to Repo Valve Lifter.
I used A lifters on a B cam and both were eaten up in 2500 miles. |
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I also checked out Vince's site. Vince gives good information there concerning problems with the use of model A tappets on the B cam. All of my engines are model A but I run B cams in a couple of them. I knew that the base of the tappets were different but was told at some time in the past that B lifters were also longer. Vince doesn't mention difference in length so maybe it isn't so. I allways used the adjustable single lock lifters and they are a lot easier to work with and have had no problems with them. |
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Q...WHY, if you know? |
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All Ford made "A" and "B" cams had the lobe tip .779" from the center line making it .001" smaller than the cam journals as shown below. To increase the lift on the "B" cam they reduced the base circle of the lobe which in turn required taller tappets to make up the difference. http://abarnyard.com/temp/engine/cam...obe_height.jpg |
Re: model A and model B lifters So the B tappets are longer. Thanks Marco.
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The smaller base of the A lifter, dropping off the cam lobe quicker and scrapeing down the side of the lobe and causing rapid wear. At least that is the way that I understand it after reading what Vince had to say. |
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Re: model A and model B lifters I'm guessing that if you used model A lifters with a B cam it would be necessary to use modern valves to make up for the .032 difference in the length of B lifters as compaired to the shorter model A lifters.
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Also, I've been told/informed (by cam people, in answer to my Q re reground cams) that NO ONE rehardens the surface on 'reground cams'. Anyone have an opinion whether that is TRUE? Herm...if B lifter has larger base than A..AND THAT'S GOOD..Why doesn't someone make an even larger base that the B lifter has:confused: |
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P.S. The lifters came from Berts Model A, and they are a hard body, as the lifter body, and bolt will laugh at a file! I am sure other places have them as well. |
Re: model A and model B lifters Ya, Mr. Hardtimes, I asked you the wrong Question, as it should have been asked of ABENNET. Same Question Sir, were your cam and lifters New, or Reground!! Thanks Herm.
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Re: model A and model B lifters When I mention model A lifters, I'm not talking about adjustable lifters, I am refering to original model A lifters. Its just common sense to me if the length of the original model B lifter is longer than the original model A lifter, This in itself will cause a problem with valve adjustment clearance if model A original lifters are used with a model B cam, especially if it is a regrind, regardless of lifter base size. It seems to me that to make up the differance in length, if original model A lifters were used with a B cam would require cutting the seats deeper or useing longer, as in modern style valves.
Now If Jose Cartin, that started this thread is going to try and use model A lifters with a model B cam and use the valves that are in his engine he will end up with a huge clearance between lifter and valve stem. That is unless someone has previously installed modern valves with longer stems or he plans on sending it out for some machine work. |
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Re: model A and model B lifters Thanks Herm, I agree. It just wouldn't be something that someone trying to use original model A lifters in an unmodified original engine with a model B cam would be set up to handle.
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Thanks for explanation. Hmm, I have a NOS B cam and you are right on...as it has BLACK colored lobes. Copper color in between:). |
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