77machomopar

I am looking at 2001 24valve with a cracked #53 block. I got a 1992 long block sitting here. So are the blocks compatible enough that i can replace the '01 block with the '92 block. And what all do i have to swap over.

jimbo486

i could very well be wrong, but i believe i've heard the 1st gens have a 53 block. others who know for a fact will chime in soon.

77machomopar

i didnt think they did. i thought it was just the late 2nd gen's. I may be wrong though too

wannadiesel

1st gens don't have "53" blocks.

You can't put the 24 valve head on the 12 valve block without changing pistons.

77machomopar

Could i use the pistons from the 24v in the 12v. I realize some machine work might be required. What connecting rods do i use? how about the mounts for the accessories. i think i would have to use the 24v timing cover for the vp41 and trans adaptor plate.

wannadiesel

You will have to check the clearances to make sure the piston fit is in spec, but assuming that neither motor is wore out they should drop in OK. I would use new rings and do a deglaze hone on the cylinders. Making sure the deck heights are right is going to be the fun part. Cummins mixes and matches rods and pistons to get the deck height just right. You may wind up with a mixed set of rods. Hopefully the set of pistons you get with the motor will work out OK, and at least you will have 12 rods to work with.

Yes, you will need to use the timing case off the 24 valve, and I'd put the 24 valve cam in while you are at it.

77machomopar

is the 24v cam that better then the 12v.

77machomopar

the deck height ought to be fun to get correct. my father works at a racing engine shop so i hope we can get it figured out quickly.

77machomopar

anything else that i should know if i end up doing this.

Riflemanusmc

All of the blocks have a deck height from OEM. Rod center to center are all the same...Check your pin bushings for clearance. Take them to a shop that has a Tobin Arp rod machine to check center to center length.....The only time that you have to worry about the rods not being in Cummins spec, if its done by a machine shop that just replace's the wrist pin bushings and just hones them without correcting center to center length. after having the big end sized to spec....Cams are differant from 1st/2nd/3rd gen. VE vs P pump vs VP44. 24V vs 1st and 2ng gen and 3rd gen...Deck height is the crank center line to the top of the block..The rest of it is just what we machinists call stacking tolerance's.. the bore size's are the same. You'd be surprised of Cummins spec vs after market on the crank OD size.. The bowl size is also differant from 12V/24V...Hope this helps....

wannadiesel

Perhaps "deck height" was not the best way to explain it, we are kind of talking about the same thing, Preston. Manufacturing tolerances being what they are, not very block, crank, rod, and piston winds up exactly identical. Cummins mixes and matches the pistons and rods to get the piston heights relative to the block deck exactly where they want it. If the 24 valve he gets had "long" rod and piston assemblies, and the 12 valve block he has is kind of on the "short" end of the scale, he could smack the pistons into the head. It needs to be checked carefully before it gets put together.

77machomopar

Thanks for the info. Would it be a good idea by putting the 12v cam in so i could run a mechanical LP to try and save the VP44. Or is the 24v cam better overall?

Riflemanusmc

Can't run a 24V cam in a 12V. Lifters are not the same. Run a 94 and later 12V cam so that you have the fuel pump lobe..better yet is to run an electrical or mechanical LP with a gauge so that one can keep an eye on pressure.....And by mechanical, I mean a belt drive like Opies or GD that DTR sells...

Riflemanusmc

Didn't mean to through you off gaurd Dave.what you are talking about is what machinist call stacking tolerance's If you go to a Cummins dealership and order RECON rods, they will not ask for your center to center length..You'll get what they sell you. Buy a new piston and its going to be the same thing. Application, yes. IE marine, on road, off road. Same thing when I was a CAT shop foreman. Its application, for the piston only. Not the rod...The only time the block comes into play, if it has been decked. AKA sufaced. Thats where the magical .20 head gasket was made for by Cummins...Blocks that were surfaced, not to lower static cr..

77machomopar

Do i have to run a 94 or newer 12v cam. or can it be the 92 cam that is in the block already? I want to do something about a LP so i dont have to replace the IP so quickly.