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Hey guys, I recently purchased this motor off another member here at the forum. Long story short, this is a boost motor and I was going to turn it back into a N/A motor. Well, I got to thinking, and that's just a dumb idea. This motor is all built and custom and forged parts ready for boost, why go through the trouble to change pistons, cam, etc to make less power anyways. Reason I say less power is this motor made 702hp. I just replaced my trans and torque tube couplers with stock, which can handle maybe 500hp. More reasons to just sell this one and find one that more so suits my needs.
Here's the specs on the motor:
2008 Corvette LS3 Block
-399 cubic inch
-4.0705 bore
-3.825 stroke
-9.66:1 compression ratio
Callies Crank
Callies H Beam connecting rods
Custom Diamond Boost pistons
ZR1 LS9 camshaft
LS3 intake
LS3 heads
Trunion rocker arm upgrade
LS2 timing chain tensioner
ARP Main studs
ARP Head studs
This motor has a lot of good parts in it. So here's the catch. It needs a refresh. I had a machine shop here in Sacramento, CA look at it, they said it needs higher tension piston rings, new rod bearings, new main bearings, crank polish, and hone the block for the new piston rings. This would be an awesome project for someone that knows how to build a motor and has the time. Cuz right now, I don't want it cuz I would have to replace the camshaft and pistons which would require more work on top of that that I don't know how to do. I bought before thinking about it, so my loss, your gain.
I'm asking $4k for it as it sits. Lots of good parts in it, I just don't have the time, don't have the know how, and it's overkill for my bone stock c5. Please pm me for questions, comments, concerns, or for more info. Thanks!
P.S. I'll get pics up ASAP. Thanks!
Last edited by Scholioso; 12-06-2017 at 12:57 PM.
Reason: Pics up!
Hey guys, I recently purchased this motor off another member here at the forum. Long story short, this is a boost motor and I was going to turn it back into a N/A motor. Well, I got to thinking, and that's just a dumb idea. This motor is all built and custom and forged parts ready for boost, why go through the trouble to change pistons, cam, etc to make less power anyways. Reason I say less power is this motor made 702hp. I just replaced my trans and torque tube couplers with stock, which can handle maybe 500hp. More reasons to just sell this one and find one that more so suits my needs.
Here's the specs on the motor:
2008 Corvette LS3 Block
-399 cubic inch
-4.0705 bore
-3.825 stroke
-9.66:1 compression ratio
Callies Crank
Callies H Beam connecting rods
Custom Diamond Boost pistons
ZR1 LS9 camshaft
LS3 intake
LS3 heads
Trunion rocker arm upgrade
LS2 timing chain tensioner
ARP Main studs
ARP Head studs
This motor has a lot of good parts in it. So here's the catch. It needs a refresh. I had a machine shop here in Sacramento, CA look at it, they said it needs higher tension piston rings, new rod bearings, new main bearings, crank polish, and hone the block for the new piston rings. This would be an awesome project for someone that knows how to build a motor and has the time. Cuz right now, I don't want it cuz I would have to replace the camshaft and pistons which would require more work on top of that that I don't know how to do. I bought before thinking about it, so my loss, your gain.
I'm asking $4k for it as it sits. Lots of good parts in it, I just don't have the time, don't have the know how, and it's overkill for my bone stock c5. Please pm me for questions, comments, concerns, or for more info. Thanks!
P.S. I'll get pics up ASAP. Thanks!
Strange that a machine shop would suggest "higher" tension oil rings....pretty hard to determine that without tearing the engine completely down and even then standard and low tension oil rings look very similar. Might be worth posting what the piston/wall clearance is so a prospective buyer knows how much clean up they can hone into the block before getting to loose. Really a pretty stellar deal.....I'd be interested if I was closer
Strange that a machine shop would suggest "higher" tension oil rings....pretty hard to determine that without tearing the engine completely down and even then standard and low tension oil rings look very similar. Might be worth posting what the piston/wall clearance is so a prospective buyer knows how much clean up they can hone into the block before getting to loose. Really a pretty stellar deal.....I'd be interested if I was closer
You are correct, the motor is completely stripped down right now. I will get the piston to wall clearance and post those stats. Shipping can be arranged!
As far as suggesting higher tension piston rings, I'm not sure why, but that's what I was told it needed. (I'm not an engine builder, so I have to trust others) TEM Machine Shop in Napa CA is where the motor is at currently. Supposedly pretty well known shop, does a lot of exotic work: ferraris, mclarens, lamborghini's, etc. Hooked me up with a flywheel balance when I was in a bind, so he earned my business. Might take it to another well known shop in the area and see what they say.
Pictures are up! I have included a picture of what TEM found when they looked it over, as well as some of the pictures of the motor itself, and the "build sheet". The build sheet states a CR of 9.36:1, TEM found it to be 9.66:1, which one is correct, I'm honestly not sure. I'm more inclined to believe TEM as AES (the shop that built it) clearly didn't do a very good job with bearing tolerances. PM me for any questions or concerns. Thank you!
Strange that a machine shop would suggest "higher" tension oil rings....pretty hard to determine that without tearing the engine completely down and even then standard and low tension oil rings look very similar. Might be worth posting what the piston/wall clearance is so a prospective buyer knows how much clean up they can hone into the block before getting to loose. Really a pretty stellar deal.....I'd be interested if I was closer
Found the piston to wall clearance is .0005. Thanks for the question as I didn't realize the importance, so thank you!
Honestly not sure, I'm just relaying info off the build sheet. You are probably right though, but looking at the pic of the white paper with all the specs, looks like .0005 to me. However, could have just been a writer error I suppose. Thanks!
Some engines actually call for an "interference" fit where the dry film coating is abraded during assembly so a zero or .0005 fit isn't unheard of.....
12-04-2017, 11:22 PM
399CI Forged & Stroked LS3
