jgonzales

I might be building an engine soon for my RX-7, I'm still tossing around ideas though. I recently found out about the LM4 engine, all aluminum truck engine that came in small SUV's. From what I understand it's the same design as the LM7, so can it be bored? If so, how much? Would it be possible to bore it enough for the L92 heads to work? I've searched, but there isn't really a lot of info on the LM4. I know the LS2 would be a better choice, but I'm trying to stay in a certain price range... thanks in advance for any help.

EDIT: If this should be in a different section of the forum, I'm sorry. I thought this would be the appropriate place to post...

vortec_7

iTrader: (2)

quick tidbit: LM4 is ~ as costly as an LS1.


Get the LS1.

LM7...not as costly, but iron block/Al heads

Bring the Noise

Hmm Wiki wiki lists the LM4 as a 5.3L.

L92 heads would work only if the block can be bored out to a 4.000" bore (or larger).

jgonzales

That's what everyone else has told me, but I've found several in my area for $1-2k with VERY low mileage so I'm looking at this as an option.

jgonzales

Yeah, I read all the info on there about it. I knew it had to be bored to 4.0" to use the L92 heads, but that was my question... can it be bored that much?

NoGamesLS1

iTrader: (16)

Not an aluminum block. It will have to be resleaved. I would just get a lq4/lq9 or a ls2 block

NoGamesLS1

iTrader: (16)

resleaving=$$$

jgonzales

Ok, that's just what I wanted to know. I didn't know if it had to be resleeved or not. Thanks!