020 over on ls1 block
020 over on ls1 block I didnt find a recent thread on this. Has anybody actually put together a 020 over motor and did it live. The liners appear to be .125 thick, if only taking away .010 of material on either side of the bore, i would think its worth trying for a hand ported heads, LTs, and ls6 cam street motor.
I wouldn't do it, the block will basically be useless at that bore size. The reason you can't find recent threads about this is because most everybody agrees. If you need a hone to clean up the cylinder walls take it to 3.905 and call it a day.
So why are u saying the block is useless at that over bore exactly?
Like i said, the liner appears to be .125. Don't see why removing .010 per side would be a problem on a basically stock rebuild.
Like i said, the liner appears to be .125. Don't see why removing .010 per side would be a problem on a basically stock rebuild.
This comes from one of the best LSX machinist you'll ever come across:
Although I have never dry sleeved an LS1 block, and don't recommend doing so, it is technically possible to dry sleeve an LS1 to 4" bore if done correctly.
For your info, the factory LS1 blocks have a gray iron liner that is only .075" thick. That is the reason why .010" over is the limit on the stock liners.
Steve
For your info, the factory LS1 blocks have a gray iron liner that is only .075" thick. That is the reason why .010" over is the limit on the stock liners.
Steve
those would be .010 over since you cant have a piston the same size as the bore....but going further tha that they make ls1 pistons in 4.125 bores. it doesnt mean they're going to fit in the block without sleeve work.
like said after .010 the liners become too thin and you chance them cracking. idk whats wrong with the op's block but i'd hate to have spent all that money for a rebuild, have the block potentially crack and have it all go down the tube. blocks are pretty cheap i wouldnt chancce it even if you "thought" it would work
like said after .010 the liners become too thin and you chance them cracking. idk whats wrong with the op's block but i'd hate to have spent all that money for a rebuild, have the block potentially crack and have it all go down the tube. blocks are pretty cheap i wouldnt chancce it even if you "thought" it would work
We had to go to .020 on 7 and 8 to straighten the bore out. Lot of wear on the thrust side. I'm building the motor myself and only need pistons, rings, and bearings so i think I'm going to go for it. Thanks for the replys.
Trending Topics
My roommate had his ls1 grenade on startup one winter and it was rebuilt by a shop that had only dealt with older engines. Needless to say it ended up with .020" pistons in it.
It's lived for several years and shows no signs of issues other than with the heads off you can see discoloration in the liners in some areas. It just transitions between light and dark gray in areas.
I wouldn't recommend it, but it doesn't mean instant failure...
It's lived for several years and shows no signs of issues other than with the heads off you can see discoloration in the liners in some areas. It just transitions between light and dark gray in areas.
I wouldn't recommend it, but it doesn't mean instant failure...
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo those would be .010 over since you cant have a piston the same size as the bore....but going further tha that they make ls1 pistons in 4.125 bores. it doesnt mean they're going to fit in the block without sleeve work.
like said after .010 the liners become too thin and you chance them cracking. idk whats wrong with the op's block but i'd hate to have spent all that money for a rebuild, have the block potentially crack and have it all go down the tube. blocks are pretty cheap i wouldnt chancce it even if you "thought" it would work
like said after .010 the liners become too thin and you chance them cracking. idk whats wrong with the op's block but i'd hate to have spent all that money for a rebuild, have the block potentially crack and have it all go down the tube. blocks are pretty cheap i wouldnt chancce it even if you "thought" it would work