fastbird02

iTrader: (4)

ok i have read that 99-00 lq4s have a longer crank only usable with a 4l80. I will probably use another crank during the rebuild as this 1 needs to hit the machine shop anyway... my question here is I see lots of threads about people using a ls3 top end on an lq4. does the fact that mine is from 2000 make a difference? and if it can be done what would i need to change. i know there are other threads like this 1, so i am sorry if these questions have been asked before.

thanks in advance for all your help
-Bruce

redtan

iTrader: (5)

Engine year doesn't matter, and you just need the top end like heads, rockers, intake manifold, fuel rails, injectors and throttle body.

COSPEED2

iTrader: (7)

If you are indeed taking it to the machine shop, a larger bore can help unshroud those large valves. If you are going with new pistons that is. And with H/E thermal coated pistons from Fed Mogul being very affordable, it seems like a no brainer really.

fastbird02

iTrader: (4)

the guy i bought it off of replaced the rod bolts with a set of arp bolts, so i was thinking of keeping stock pistons and rods, but my buddys dad was telling me to look into a stroker kit as opposed to having the stock crank machined and reusing the stock pistons/rods. its going to be a turbo motor, not sure what it will go in yet.

DETROIT_AREA_00_SS

iTrader: (7)

Do it right while it's out.

Forged pistons and rods. Bore it a little 4.010 is what I did. I wouldn't go to a bigger stroke, I like the piston to stay in the cylinder as much as possible for boosted applications.

Ls9 gaskets and a cam spec'ed for your application and goals.

COSPEED2

iTrader: (7)

You can go one of 2 ways. Def new bearings. Then either forged rods and pistons using stock crank or a whole forged stroker assy. The whole stroker assy will be quite a bit more money but can possibly net you a bit more power. A 4" stroke will not bring the piston out of the cylinder.

We can help you with any of your options or choices just let us know!

fastbird02

iTrader: (4)

ugh thats the way i was leaning (full forged rotating) I was hoping you guys would say "stock rods and pistons with arp bolts will be fine".... oh well... there goes the "savings acct" lol

COSPEED2

iTrader: (7)

The key word you said it is will be a turbo motor. You can use some of the better stock style hyper-e pistons that we can get yah with a thermal coating but you def would need a better rod. Either the LS2 or a forged. Both are going to be about the same price new.

NA would be no problem ,but you dont want to build the motor twice. That is a waste of money.