bulletpruf
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My 7.3 IDI turbo (with factory Garrett setup) came out of a '94 cab and chassis truck and I have zero history on it. It was turning over but not running.
I got it apart and figured out it was a reman -- the rods have been stamped, but some knucklehead stamped two rods #7 and there's no #6. In addition, there was a handwritten tag on a valve cover indicating 200 hp at 3,000 rpm.
The wrist pins are 33mm, so has turbo pistons and rods.
The turbo oil feed fitting threads .527" OD, so that should be 1/4" NPT, correct for a turbo block (non-turbo has 1/8", right?).
However, the stamped engine number is "7.3D U2U1056997". I thought a turbo block had a C or K in the number.
In addition, the block casting number on the driver's side by the engine mount bosses ends in C1, not C3.
I'm thinking it's not a turbo block. Maybe someone drilled out the oil feed hole and tapped for 1/4" NPT?
Also, the bores are 4.150" so it's been bored .040". Some of the pistons are cracked, so if I use the block, it will need, at a minimum, new slugs.
I haven't checked the bore taper yet, but all of the cylinders seem to have very minor rust, one has a ridge (not sure why the rest don't), and one cylinder has some minor scratches that I can barely catch my fingernail on. It may be good to go with a hone, remaining at .040" but that seems like it would be sketchy, at best.
This won't be a radical build; just looking for close to 500 ft/lbs at the wheels, so maybe a drop-in turbo, Stage 1 injectors, and an upgrade on the pump, but I still think the walls are too thin, and I have no idea whether this engine got SCA's, either.
I realize I can get all the cylinders sleeved on the 7.3, but for what that will cost me, I can source a used 7.3 block with standard bore.
My truck is an '87 F350; the original engine is a 6.9, and I have that as an option. It should be standard bore, but one cylinder will likely need a sleeve (had water sitting in it). I realize that with a 6.9 I have smaller head bolts, but I would definitely upgrade to studs, keep an eye on EGTs, keep boost at a reasonable level, etc.
Thanks in advance for any input!
Scott
I got it apart and figured out it was a reman -- the rods have been stamped, but some knucklehead stamped two rods #7 and there's no #6. In addition, there was a handwritten tag on a valve cover indicating 200 hp at 3,000 rpm.
The wrist pins are 33mm, so has turbo pistons and rods.
The turbo oil feed fitting threads .527" OD, so that should be 1/4" NPT, correct for a turbo block (non-turbo has 1/8", right?).
However, the stamped engine number is "7.3D U2U1056997". I thought a turbo block had a C or K in the number.
In addition, the block casting number on the driver's side by the engine mount bosses ends in C1, not C3.
I'm thinking it's not a turbo block. Maybe someone drilled out the oil feed hole and tapped for 1/4" NPT?
Also, the bores are 4.150" so it's been bored .040". Some of the pistons are cracked, so if I use the block, it will need, at a minimum, new slugs.
I haven't checked the bore taper yet, but all of the cylinders seem to have very minor rust, one has a ridge (not sure why the rest don't), and one cylinder has some minor scratches that I can barely catch my fingernail on. It may be good to go with a hone, remaining at .040" but that seems like it would be sketchy, at best.
This won't be a radical build; just looking for close to 500 ft/lbs at the wheels, so maybe a drop-in turbo, Stage 1 injectors, and an upgrade on the pump, but I still think the walls are too thin, and I have no idea whether this engine got SCA's, either.
I realize I can get all the cylinders sleeved on the 7.3, but for what that will cost me, I can source a used 7.3 block with standard bore.
My truck is an '87 F350; the original engine is a 6.9, and I have that as an option. It should be standard bore, but one cylinder will likely need a sleeve (had water sitting in it). I realize that with a 6.9 I have smaller head bolts, but I would definitely upgrade to studs, keep an eye on EGTs, keep boost at a reasonable level, etc.
Thanks in advance for any input!
Scott
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