Lock and stitch inserts revisited
As many of you know, I am a proponent of the Lock and stitch inserts on the center mains in the 6.2/6.5 outer bolts.
The early blocks used 12mm outer bolts and the later engines use 10mm bolts.
I am of the opinion that on any cracked webs that have the 12mm Bolts that the 10mm L&S Insert should be installed in place of the 12mm ones.
The block must be drilled oversize anyway and using the 10mm insert will reduce the size of the hole and in effect keep more material in the block.
The only things is that it will be necessary to buy 6 10mm main bolts.
The holes in the cap are the same on both so that's not an issue.
If you are going to buy the tools, I would get the 10mm tooling.
Missy
599 casting with typical cracks
Hi,
Just recently I got a 1993 1 ton drive-train
It has the L65 engine, no emissions, no cats....
I was told it has 82k orig. miles
I took the heads off to find they are not the same heads
The turbo side has the #567 head, and it is cracked at the second and eighth cylinder where the valves meet
The other side has a head with a casting # L275 and has no cracks
The block is a 599 casting and was made on August 6th 1992 according to the code
Everything looks great inside the block, Pistons, cylinders, bearings, cam.....etc.
This leads me to believe it really does have 82k orig. miles
I acquired this engine to do a long awaited custom engine swap
I have the block to bare bones and am about to bring it to the machine shop for some new cam bearings and a cleaning
After extensive reading on this forum about the engine and a few other forums I became well acquainted with the popular main web cracks
Today I did some detective work and discovered some small cracks on this block
I have read extensively on the lock & stitch full torque insert fix
I'm asking for some professional feedback on whether or not to push forward on this build and do the inserts to remedy the cracks
I have read about checking the deck situation of the block to determine if it has been machined or not
Tomorrow I am going to throw the crank back in and a few pistons to check for sure if it has been machined or not
Thanks for the support
-Ben
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