Rework old style head compared to new style head

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Rework old style head compared to new style head

Postby staninlowerAL » Wed May 20, 2015 4:41 pm

Anyone know how much metal that can be removed from the old style head part #251 228 R1 when resurfacing it? I want to make sure that it will not interfere with the domed style pistons. New style head is part #355 691 R2 used with domed style pistons. Thanks. Stan

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Re: Rework old style head compared to new style head

Postby staninlowerAL » Thu Jun 11, 2015 9:27 pm

Still looking for information on this subject. Stan

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Re: Rework old style head compared to new style head

Postby Bob McCarty » Thu Jun 11, 2015 9:48 pm

Stan, I can't answer your question but remember that someone (maybe Rick Prentice or Yogie) switched to domed pistons and had to mark and relieve the head just a little for clearance. The high altitude head was shaved to increase compression, although I don't know how much.

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Re: Rework old style head compared to new style head

Postby staninlowerAL » Fri Jun 12, 2015 5:31 am

Thanks Bob. I've posted the details and pictures of this engine on the numbered loboy forum. The damaged head that I took off was the old style R1 while the parts books say the head for all number series should be the new style R2 head which I don't have but I do have a spare old style head. It will obviously work because someone used it before, I just don't know what was done to it to make it work. Here's the pictures of the old head and top of the block. Is this what the top of the pistons should look like? I've never seen the domed piston so I don't know.
12engine top.JPG
9ahead off1.JPG

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Re: Rework old style head compared to new style head

Postby tst » Fri Jun 12, 2015 8:43 am

Can't you fix the old head Stan? :lol:

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Re: Rework old style head compared to new style head

Postby Eugene » Fri Jun 12, 2015 9:49 am

What ever you do with the replacement head. Get some modeling clay. Put a thin layer either on top of each piston or in each combustion part of the head. Using 4 bolts snug down the head without head gasket. Roll engine over by hand.

You are checking to see if a piston(s) hit(s) the head. If a piston hits the head, you will be able to see where you need to relieve the head or the piston.

Someone, I think John Puckett, talked about using a similar process.
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Re: Rework old style head compared to new style head

Postby Boss Hog » Fri Jun 12, 2015 5:50 pm

grind the head if needed [ I do not think you will need to] DO NOT GRIND THE PISTON. Only remove enough material from the head to make it flat. Use the old head gasket and torque the head down as long as you have .030 clearance you will be ok unless you spin a bearing and then you will have problems anyway :D
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Re: Rework old style head compared to new style head

Postby staninlowerAL » Fri Jun 12, 2015 8:25 pm

Thanks Guys for all the input. Anyone know the difference in the R1 versis the R2 head? There had to be some change but so far, no one has commented on that. Stan

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Re: Rework old style head compared to new style head

Postby Boss Hog » Fri Jun 12, 2015 9:41 pm

you have both heads dont you have a look see :D
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Location: AL (Southwest)

Re: Rework old style head compared to new style head

Postby staninlowerAL » Sat Jun 13, 2015 8:44 am

Boss Hog wrote:you have both heads dont you have a look see :D

That's part of the problem: I don't have a R2 head to compare. The one I took off that is damaged is R1 head, same as the one I plan to use in its place, hence trying to find out what is the difference. Thanks.
EDIT: Maybe this link to my other post on the 154 forum will show better what I'm dealing with:
viewtopic.php?f=31&t=88683#p706270

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bob in CT
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Re: Rework old style head compared to new style head

Postby bob in CT » Sat Jun 13, 2015 9:50 am

I cc'd both heads and posted the results a couple years ago.

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Re: Rework old style head compared to new style head

Postby bob in CT » Sat Jun 13, 2015 9:52 am


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Re: Rework old style head compared to new style head

Postby BigBill » Sat Feb 11, 2017 11:11 am

When building drag race engines or rebuilding engines I cut the heads .010" to make sure there flat. Or just till there clean. (+ or -)
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.


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