Case 900lp

bleedcase · Jan 13, 2017

Yes I just got a 900lp and was wanting to pull with it. Would like to keep it div. 1 or 2. What's a safe size to bore it out to and what pistons and heads should I use. Any other information would be greatly appreciated. Thanks in advance.

ejr-IA · Jan 17, 2017

Use Moline 4 5/8 piston very simple.504 cid

brutus49DC · Jan 18, 2017

not so simple- there are water holes in the head that need to be welded shut and the hundred series bolt pattern wont accept the 70/90 series 504 head gasket needed for a 4 5/8 bore but a 30 series block will

Dodgeit · Jan 19, 2017

(quoted from post at 21:33:49 01/18/17) not so simple- there are water holes in the head that need to be welded shut and the hundred series bolt pattern wont accept the 70/90 series 504 head gasket needed for a 4 5/8 bore but a 30 series block will

Just to add my two cents, the 30 series heads won't work with the 70/90 series head gaskets without welding up one oblong water jacket hole in each head. I found that out the hard way, so had copper head gaskets made.

trulyred · Jan 19, 2017

The Moline 4 5/8 pistons work fine with 900 lp stock heads. Built one that way with 1/2" stroke. Have the sleeves bored to 4 5/8. I cut the pistons due to the stroke, leaving a dome. You may have to cut the top of the pistons off, but not much. You can leave most of the center as a dome increasing compression, the piston will hit the cyl. head in two places. 70 series head gskts might be made to work, I had head gskts made.

mEl · Feb 13, 2017

Head gaskets are a pain in the neck , I haven't used any on any of my builds!! Copper wire works excellent for a compression seal and red RTV does the rest, Gaskets raise the head .060-.080 and take away from your compression and are an added cost not needed for weekend warrior pulling.

The reason I went to that system was the inability of a major aftermarket gasket company to make a gasket that would hold. Copper wire of the right dimension is available at any electric motor rebuilder and they gave it to us.

If you are doing a build and the sleeves are not in the block a very simple machining on the top outer edge of the sleeve sets you right to install a wire seal and less than $10.00 will provide the RTV.

I have shared this info with another builder who solved an ongoing gasket failure problem on a high performance Diesel and he was amazed how easy and effective it is, Get rid of head gaskets, they are a major headache for builders.

forty40 · Feb 15, 2017

When cylinder bores get very large in relation to bore CL spacing the builder should look at grooving the cylinder head instead of the sleeve. One of my fellow pullers had a portion of the sleeve "crush off" which proved cast iron is not compressible.

mEl · Feb 15, 2017

Depends where you put the groove, when possible I put the groove in the outer top edge of the sleeve and use the block wall as the outer edge,and much thickness to the bore side to keep the sleeve strong, I have done the heads also but sleeves can be done in a simple lathe. If done properly the wire system virtually eliminates compression sealing problems and using RTV Red as a sealer with no gasket has produced results of having several years running as pullers with few if any issues.

Case 900lp

bleedcase

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ejr-IA

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brutus49DC

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Dodgeit

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trulyred

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mEl

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forty40

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mEl

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