1986 IROC-Z engine build

[redsoxsstink]

i figured id start a project thread. ive been collecting parts for my motor build for the past two months. i have basically everything i need to drop the motor in aside from a few small bits.

the setup is as follows:
new GM L98 replacement shortblock
RHS 200cc/64cc aluminum heads
comp cams xr276hr
comp cams 1.6 ratio roller rockers
comp hydraulic lifters
comp double roller timing chain
ARP hardware throughout

should be in the area of 10.5/1 compression

painted with por15 engine enamel

not pictured but in the works is either a TPIS miniram or Holley/Weiand Stealth Ram intake

going in the car this spring and will be driven to Ocean City MD for cruise weekend

[Paul Huryk]

Nice!

If you need anything, give me a holler - I'm close to you...

[chrisfrom nj]

looks good man

[redsoxsstink]

got some new stuff


thing is massive...

[greenformula92]

I hope that thing isn't in the basement lol. I would love to see the car once you got her all back together. Mine is pretty much ready except for a couple things like a tune and a new convertible top

[WildBillyT]

First,

Looks awesome!

Got a pic of the pistons or P/N for the short block?

[redsoxsstink]

Originally Posted by WildBillyT

First,

Looks awesome!

Got of the pistons or P/N for the short block?

The number that I can get from the bottom of the piston is 101v13 mahle. I know that's not the p/n but from what I can gather 4 reliefs 4-6cc volume.

And yes it's in the basement lol. We will be able to carry it up though. I hope to have it in the car by the end of the month.

[sweetbmxrider]

That is an easy 500lbs. Good luck

[redsoxsstink]

Originally Posted by sweetbmxrider

That is an easy 500lbs. Good luck

welllllll aware. me and my dad should be able to wrangle it up some stairs. carried the shortblock down by itself without a problem. the heads are only another 50lbs. the intake will be off while in transit

[zraffz]

Originally Posted by redsoxsstink

welllllll aware. me and my dad should be able to wrangle it up some stairs. carried the shortblock down by itself without a problem. the heads are only another 50lbs. the intake will be off while in transit

Mad man lol. I hump motors around but wouldn't chance it going up a flight of stairs. I'd be assembling my motor in my kitchen before I did that lol.

[WildBillyT]

Originally Posted by redsoxsstink

The number that I can get from the bottom of the piston is 101v13 mahle. I know that's not the p/n but from what I can gather 4 reliefs 4-6cc volume.

And yes it's in the basement lol. We will be able to carry it up though. I hope to have it in the car by the end of the month.

Gotcha. I was just checking b/c the old L98 short block from GM was a 9:1 engine with 64cc heads.

[redsoxsstink]

Originally Posted by WildBillyT

Gotcha. I was just checking b/c the old L98 short block from GM was a 9:1 engine with 64cc heads.

went with a smaller head gasket .015, piston is .026 in the hole. so i got the quench right at .041 and bumped compression. i think the stock head gasket is .038? im not sure. but according to my calculation compression should be right around 10.5

[WildBillyT]

Originally Posted by redsoxsstink

went with a smaller head gasket .015, piston is .026 in the hole. so i got the quench right at .041 and bumped compression. i think the stock head gasket is .038? im not sure. but according to my calculation compression should be right around 10.5

Perfect, my 1094s work great

The old L98 pistons were 4 valve relief but also a -12cc dish. That was the killer.

[redsoxsstink]

Originally Posted by WildBillyT

Perfect, my 1094s work great

The old L98 pistons were 4 valve relief but also a -12cc dish. That was the killer.

Can't tell if troll or srs about the 1094s.

From my understanding it's a late l98. The number on the pistons cross reference to lt1s too so I assume it's the later style.

[WildBillyT]

Originally Posted by redsoxsstink

Can't tell if troll or srs about the 1094s.

From my understanding it's a late l98. The number on the pistons cross reference to lt1s too so I assume it's the later style.

Serious, they seal great (knock on wood).

That's cool man. Wasn't trying to bust balls, just checking since it's still a bit early.

[redsoxsstink]

No worries. I heard good things about them too. Kinda amazing they work since there is literally nothing too them. Did you copper coat yours?

[WildBillyT]

Originally Posted by redsoxsstink

No worries. I heard good things about them too. Kinda amazing they work since there is literally nothing too them. Did you copper coat yours?

No. I was very meticulous in cleaning the surfaces though.

[redsoxsstink]

Originally Posted by WildBillyT

First,

Looks awesome!

Got a pic of the pistons or P/N for the short block?

if you were curious 224-3497 is the p/n for the pistons. they were oem in LT1/LT4, L98 and many other engines, dish volume is 6.5-7cc 4 reliefs.

[zraffz]

The 1094's don't need copper coating. Technically they are shims not gaskets but being rubber coated they will seal up.
The non coated metal ones are the scary ones to seal lol. Spray the piss outta them with copper coat on one side, let it get tacky, hold it and spray the other side. I think the smallest shims I've ever used were .008" because I was trying to tighten up the quench on a n2o motor.

[redsoxsstink]

Originally Posted by zraffz

The 1094's don't need copper coating. Technically they are shims not gaskets but being rubber coated they will seal up.
The non coated metal ones are the scary ones to seal lol. Spray the piss outta them with copper coat on one side, let it get tacky, hold it and spray the other side. I think the smallest shims I've ever used were .008" because I was trying to tighten up the quench on a n2o motor.

i know they didnt need it since they are rubberized. ive heard people coat them and not coat them. i did it just to be safe i figured it couldnt hurt

[redsoxsstink]

some progress this past weekend



discovered the source of my old motors insatiable appetite for coolant.... a nice crack in the block

[redsoxsstink]

did a few things today...

• carried motor up from basement with my father
  painted the headers
  painted bell housing
  painted trans
  yanked rest of A/C out
  installedmotor in the car

whats left...

• install cooling sytem
  plumb fuel lines
  put trans back in

[WildBillyT]

Why no long tubes? Do they fit poorly on 3rd gens?

[redsoxsstink]

Originally Posted by WildBillyT

Why no long tubes? Do they fit poorly on 3rd gens?

they do make some that are very nice, but i play to really lower it in the future so i want to save some ground clearance. also my budget is very tight until OCMD i cant afford them even if i wanted right now.

if you can tell in the pic, you can see they are all banged up. they are the same headers the p/o i just painted them

[zraffz]

Originally Posted by WildBillyT

Why no long tubes? Do they fit poorly on 3rd gens?

I've never seen a set that fit nice on any lowered 3rd gen on 4th gen LT1. On my lowered LT1 the collectors are about 2.5" off the ground.