LT5 Assembly Project

[flyin ryan]

LH (Dr.) or RH (Pass.) bank?

[LGAFF]

D/S bank.

LGAFF
92 ZR1
#234

[Polo-1]

Nikasil liners....... if it's scratched,chipped it's a gone. You could have it re-nikasiled. Or I have 16 pistons, rings & liners with the rods. 1 set under 10k, 2nd set has 65k on them. Rod bearings are standard SBC.

[flyin ryan]

Originally Posted by LGAFF

D/S bank.

LGAFF
92 ZR1
#234

o.k., well that's the better side to be on if it has to be, D/S outside. are you able to have it touch honed? maybe 320 or even 400 grit. don't get carried away, just a light rub.

[Zr1 Destroyer]

Originally Posted by LGAFF

Ok, Just looking for opinions....

I have the head bolts coming. Any thoughts on the pistons and liners with regard to the screw damage? Would you replace? From what I see there is only a minor hair thin scratch in one of the liners that can barely be felt.

Who is the best source for pistons/liners?

In terms of bearings, would you look to replace...if so suppliers and $$

LGAFF
92ZR1
#234

If your main bearings aren't in too bad of shape just send them out to get re_coated.......calico will redo them for you.

I was just looking at the pic of your pan and it reminded me of mine.....after I unbolted the sump I found my dipstick tube seal wedged in the side of the screen......it made me laugh.

[LGAFF]

One of the questions I had was about #s matching engines. I have been told that there were no #s matching before, but this is not correct. I did find that the top part of the block is stamped with the prodution # in this case 5800702, or #702. I also noted that the various pieces have different production dates, the top half of the block was manufactured on 10-3-89, the lower half 10-20-89....the oil pan 8-21-89. So it appears as long as the top half of the block is correct you have a #s matching car.

I have heard from a few forum members that any type of #s matching program may have ceased in 1991.

Thought people would find this interesting, by the way, even the valves have date stamps on them.

LGAFF
92 ZR1
#234

[LT-5 Music]

Newbie here to LT-5 tech and I am really enjoying this thread.

[LGAFF]

Well I bought new head bolts from Jerry and received them today, perfect timing as the wife was out of the house when they arrived...thanks Jerry.

I cleaned some grime off the block, and then examined the pistons I truly think there are 2 that will need to go. But I am going to pull them and look at the sides to see how bad the damage is....maybe sand them alittle and see what happens.

I assume the next steps to access the crank bearings and pistons would be as follows:

Step 1: Remove the timing chains....

loosen tensioner:


and then unbolt the primary chain gear:


Any tricks or concerns on the tensioners? The secodary/cam chain tensioners were removed prior to shipping the motor.

LGAFF
92 ZR1
#234

[LGAFF]

I will probably start removing the chains tomorrow:

After the chains, will need to remove the main main bearing caps. From what I can see in order to remove the main bearing caps, the lower half of the block or the girdle will need to be removed.

Pic shows were block is in two pieces:




The girdle is made of aluminum, and it looks like the steel main caps sit under the girdle in a dovetail fashion:



LGAFF
92 ZR1
#234

[LGAFF]

The girdle is held on by a series of 10mm bolts internally seen here:



and I believe there are 8 external, as seen here:




Almost forgot, oil pump might also have to come off.....open for feedback to those that have done this before.

Thanks

LGAFF
92 ZR1
#234