chpmnsws6

iTrader: (70)

Like a fool, I put the engine in my Miata before figuring out what all it had. 3 years later, its time for a rebuild.

Anyway-
Are the pins floating?
Is the chain the same as the LS2?
What is the safe bore limit? Can I do a 3.903 or 3.905?

I have a hard time finding any straight information.

Thanks!

cam

iTrader: (9)

Floating pins yes.

Timing chain im pretty sure is the same as LS2 ( regardless its not a bad chain )

Max bore? Dunno, but theres some meat to them liners

chpmnsws6

iTrader: (70)

Has anyone dug into an L33 since this post? Looking at pistons...

cam

iTrader: (9)

I have read you can bore these to slightly over stock LS1 bore. Some say 30 past, some say 70, but regardless you can bore the heck out of them if your so inclined but Id think it cheaper, wiser, and better to start with an LS2 block for big cube builds.

As for pistons? If your stepping from stock then Diamond make a nice slug, Wiseco etc. Callies rods and either of those would make a hella boost engine. The block can take some jam....

chpmnsws6

iTrader: (70)

I'm actually now just looking for a 3.898 piston (to keep the meat on the sleeves and offer another rebuild down the road if need be) with the stock rods. I've put together several engines with the Mahle pistons and good rods but since the Miata will never have a bunch of juice or PSI down the intake, I figure stock rods should be plenty.

Smoke23

I just did my iron block 5.3 to 3.905..

RonSSNova

iTrader: (3)

I have mine all apart right now.

Pins are floating. Rods are the Gen IV. They look good to me!
Chain and gear are the same as LS2.
Block is drilled for the damper as well, but there wasn't one in mine.

I would sonic check the bores befor boring to LS1 size. I know it's been done, but wouldn't you rather know?

Wiseco makes nice drop in pistons that use the stock rod. Called the JY series. Std, .010 and .020.

Ron

lt1 sport

iTrader: (13)

Im pretty sure the L33 acutally uses the same sleeves as an LS1 there just not bored out to 3.898"

Jimbo1367

If you keep the OEM rods, be sure to upgrade the bolts. For a little more, you can upgrade the rods. Sounds like a no brainer. IMO