what is the most you can bore an LS1 block?
and what is the biggest stroke you can go?

 

You can bore it up to .010

Max Stroke 4.125

 

I've put some 4.250 stroke motors together...

 

i was thinking of building up a late model 455 for a friends TA, just wondering if it would be possible...

 

yes its possible, not ideal though. MTI did it with a 4.155 x 4.250 combo. with the new darton 4.200 sleeves you can go 4.200 x 4.125 and get 457.

 

why is it not ideal?

 

There really isn't enough deck height on these blocks to run a 4.25" stroke. The ring pack gets really tight, wrist pin is well into the oil ring and the piston skirt is unexceptably short. This results in a short lived engine.

I don't like to go over 4" stroke. Much longer and you will be taking the engine apart every 15 - 20K miles for a rebuild.

 

very well....sounds like he will be getting a 427 instead
lol

 

When are those going to be ready? I like the idea of a 406 CID stroker( 4.2 x 3.662 ).