Originally Posted By: NOX
First time poster, did not see anything regarding rebuilding the 4200 LL8 engine. . . Please don't flame me if I missed something!

Anyhoo, I found this 4200. Looks like it would need some serious work on the bottom end, but for less than $200, I find myself very tempted.

Feel free to snatch that thing up, too. If someone here wants it first, fair's fair. I'm still trying to make up my mind.



Offer him $50 and use it as fitment core, a good running 2005 4200 can be had for $500. No one is going to pay $180 for it.

Once your done with the core haul the head off and port it - its worth 20-25HP and swap it onto the other engine. Sell the block/other head to the next guy for a fitment core for $50.

Note the 2002 to 2005 engines had black valve covers and early heads. With a ported early head and good exhaust you'll be close to 300HP.

The late motors have better parts but also cost closer to $1000.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them