For some reason my naturally aspirated 427 stroker blew all my coolant out the overflow and overheated, have milkshake oil… I have maybe 200 miles on the build with awesome power. I’m thinking it might be the block but I guess it could be the head or head gasket, regardless it’s not drivable. I have a re-sleeved LS1 block to 4.060 with All Pro heads, Ross billet pistons and Manley H beams … installed steel cometic head gaskets… with this combo I can’t understand why there would be a coolant problem at all... Regardless I am considering pulling everything out of the block and putting it in a L92 block which will save me thousands by accepting the Pistons and rotating assembly as well as everything else (cam, covers etc.)… the only thing I’m not sure about is the max stroke of the L92 block… my crank is a 4.125” Lunati. I can’t find a definitive answer posted anywhere on this stroke in an L92… MOST say its okay some say it will not work, please help! Also, I dont want to use DOD so what block mods need to be done… are plugs needed…

PLEEEEEAAASSSSSE HELP.

Gunner

 

reliability is an issue with that stroke because of the ring lands. the definitive answer is...there is no definitive answer. some builders are doing it while others wouldnt touch that setup with a ten foot pole.

in terms of going dod youd need the lifters, solenoids, etc to run it. i think you should look more into the vvt stuff. theres a lot of potential in it in terms of power and economy.

 

I'm confident with the build just want to make sure i wont catch an oil ring. I dont want to use the DOD, do you know what needs to be done if i dont want to use DOD sir???

 

You may be looking at a sleeve issue with your old setup. Pull it down and have a look see. You could use your rotating assembly in an LS-2 block with just a set of pistons. Truck Iron block and use your current pistons or LS-X block and run a very large displacement with just pistons, rings, bearings, things you need to replace no matter how you go. So you are open to a lot of things. Good luck with your next build.

D.J.

 

"Mikey" ran a 4.125" crank in a LS2 block which is nearly exactly the same as the L92 block except for the bore size. I agree your current setup sounds like it has a sleeve problem, I have seen sleeves drop .010" and blow coolant by them.

 

err, oops, get rid of everything related to it and plug the oil gallies in the lifter valley

 

Cool... how are they plugging the oil feeds in lifter valley... small freeze plugs... threaded plugs? I’m not in the least familiar with the DOD blocks.

 

There are MANY guys running sleeved LS1's with 10's of thousands of miles on them. Rather than tearing everything apart and throwing away money, how about just finding the root of the problem.

It could be as simple as a blown head gasket.

Pull the heads and take a look.

 

I had Cometics leak twice on my 346 and yes everything was prepped correctly.

 

I agree... doing a leak down test tomorrow.

 

did you stay with cometics the third time???

 

The LS2 valley cover has seals built onto the bottom surface that plug the oil passages as it is bolted on. This is how GM disables DOD. The L92 cover incorporates the control valves that switch DOD on.
Steve

 

The only thing I could think of that would dothat is an uneven block or head deck. Weve used literally dozens of cometic gaskets on every LSx block out and not had a single one leak... unless its a early lsx head with anotch in the deck that wasnt welded up or a screwy block deck. THey need to be very flatand very smooth

 

Shirl Dickey is running a nice 441 L92 combo of 4.100" bore by 4.100" stroke. He has run it for most of an auto racing season with no problems. Shoot him a PM for more details.

Keith

 

4.1 x 4.1 is a 433.

Marty