Need motor help fast!
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TECH Apprentice
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From: SS Indianapolis, IN
Need motor help fast! Alright, to make a long story short, I bought a short block from a gentleman on this board. It has been 5 weeks since payment, and I drove 4 hours to pick it up last night only to arrive and sit there and watch him put it together in front of me.
There are a couple things that I'm not happy with and those will be addressed later on in private. What I need to know is this....
It was supposed to be a zero deck height short block. Once the motor was assembled last night we checked TDC. The pistons come out of the cylinder .046. Thats too much. My heads are milled .025, and I have a rather large cam. The motor builder told me just to use a thicker head gasket. Like .070 thick! Won't my intake fit wrong? I had planned on using 7.035 pushrods. Will the thicker gasket change the fit of the top end, change the setup as far as pushrods and PTV clearance, and will it lower my compression.
Thought?
There are a couple things that I'm not happy with and those will be addressed later on in private. What I need to know is this....
It was supposed to be a zero deck height short block. Once the motor was assembled last night we checked TDC. The pistons come out of the cylinder .046. Thats too much. My heads are milled .025, and I have a rather large cam. The motor builder told me just to use a thicker head gasket. Like .070 thick! Won't my intake fit wrong? I had planned on using 7.035 pushrods. Will the thicker gasket change the fit of the top end, change the setup as far as pushrods and PTV clearance, and will it lower my compression.
Thought?
With a piston out of the hole .046" you should be VERY concerned about pistons contacting the cylinder heads. Sounds like the cranks/rods/pistons aren't matched properly!!
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.046 is definitely something to be worries about.. I wouldn't run that motor with your heads most definitely. Figure out where the problem is, maybe the pistons are wrong or rods are to long. Something is definitely wrong.
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TECH Apprentice
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From: SS Indianapolis, IN
He seems to think that the block was decked too far. I have the box for the pistons and the rods, and hey are stock height and length. I'm afraid that I now have a $2000 paper weight.
What length rod and what is the compression distance on the piston (often notated as CD: on the piston labels)? That'll help figure it out. It's not too often you see a block decked .045" just for grins!
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I just talked to him. The piston part number is Mahle ls1340908f04. It is a Crower rod and I think it is a 6.100. I can't find any literature in the CD of the piston. I just can't imagine they'd block the deck .045...
Edit: It looks like the CD is 1.340
Edit: It looks like the CD is 1.340
Last edited by dheck; May 15, 2008 at 12:34 PM.
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Verdad Gallardo If it's a stock crank, that would put your pistons out of the hole .011". Now if for some reason it was a 4" crank, the pistons would be out of the hole .20", which is highly unlikely from your measurements in the original post. BUT, if it's a stock crank, and a 6.125" rod with that piston, they be out of the hole .036". I'd guess that is the case here. Are there any markings/engravings on the rods to indicate if which length they are?
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Wrong rods and maybe some block decking would be my bet at this point from the information provided.
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RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Alright, to make a long story short, I bought a short block from a gentleman on this board. It has been 5 weeks since payment, and I drove 4 hours to pick it up last night only to arrive and sit there and watch him put it together in front of me.
There are a couple things that I'm not happy with and those will be addressed later on in private. What I need to know is this....
It was supposed to be a zero deck height short block. Once the motor was assembled last night we checked TDC. The pistons come out of the cylinder .046. Thats too much. My heads are milled .025, and I have a rather large cam. The motor builder told me just to use a thicker head gasket. Like .070 thick! Won't my intake fit wrong? I had planned on using 7.035 pushrods. Will the thicker gasket change the fit of the top end, change the setup as far as pushrods and PTV clearance, and will it lower my compression.
Thought?
There are a couple things that I'm not happy with and those will be addressed later on in private. What I need to know is this....
It was supposed to be a zero deck height short block. Once the motor was assembled last night we checked TDC. The pistons come out of the cylinder .046. Thats too much. My heads are milled .025, and I have a rather large cam. The motor builder told me just to use a thicker head gasket. Like .070 thick! Won't my intake fit wrong? I had planned on using 7.035 pushrods. Will the thicker gasket change the fit of the top end, change the setup as far as pushrods and PTV clearance, and will it lower my compression.
Thought?
Usually you mock that up to see where it is before you do anything else as fasr as decking anyway?
Thread Starter
TECH Apprentice
iTrader: (45)
Joined: Jan 2006
Posts: 387
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From: SS Indianapolis, IN
Anyone want to buy a 95 Trans Am Roller? Hard-top car with an LS Tubular K. I'll make you a great deal!
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Yep they probably weren't aware of all the different combos people sell and parts for these LSx engines and just assumed everything was right and ready to go. Then it was too late when they were already putting it together and they see the pistons are .046 out of the hole!
Thread Starter
TECH Apprentice
iTrader: (45)
Joined: Jan 2006
Posts: 387
Likes: 0
From: SS Indianapolis, IN
Yep they probably weren't aware of all the different combos people sell and parts for these LSx engines and just assumed everything was right and ready to go. Then it was too late when they were already putting it together and they see the pistons are .046 out of the hole!
