Mike's 1986 IROC Z Thread

[ruckusz28]

I used to have a 97 silverado and loved it. It too big to fit in the parking garage back when I was at quicken. Plus the trans was on the way out. With all the rust, I decided to cut my losses. Keep your eyes peeled for me. reg cab, short bed, 2wd

[JoeliusZ28]

What's this?

FYI...There were still GMT400 utes for another year (or two) after 1998. It was a slow, rolling changeover.

Well yeah there were the 99 classics and 3/4 tons but those are either not what hes looking for or pretty rare.

[DynoDave]

Well yeah there were the 99 classics and 3/4 tons but those are either not what hes looking for or pretty rare.

I got ya.

But what's this you are saying about a tuner available for '98 L31s? I have a '98 GMC Suburban with one.

[JoeliusZ28]

At least at the time i had my 98 Z71 the HPTuner suite only supported 98+ pcms. I tuned my own truck with that software. I cleaned up the fuel trims, removed the delay for power enrichment, removed all torque management, and firmed up the line pressure a tad and wow what a difference. That truck went from barely being able to brake torque, to smoke-showing a set of 285 BFG ATs without any help from the brakes. Didnt really add any top end horsepower but the response and downlow grunt of that engine was incredible after i made those tweaks. Really miss that truck...

[Darren]

So Mike... Which motor?

[ruckusz28]

Well yeah there were the 99 classics and 3/4 tons but those are either not what hes looking for or pretty rare.

Wasn't really looking for a 4x4, but this is a pretty sweet truck for the price. http://www.autotrader.com/cars-for-s...77760005&Log=0

[ruckusz28]

So Mike... Which motor?

There are some pretty stout third gens on here now, so I'm going to need to keep up. I imagine it would suck to swap an engine just to be the slowest out there.

I am 90 percent sold on this motor. http://www.jegs.com/p/Blueprint-Engi...rPage=90&pno=1
Block:
4-bolt main block, 1 piece rear main seal
Passenger side dipstick
Square and parallel decked
Align honed main bearing bore
Cylinders are sonic tested for thickness
Cylinders honed on a computer controlled machine to within .0002'' straightness and roundnessRotating Assembly:
Blueprint premium cast iron crankshaft (1 piece rear main seal)
Chevy heavy beam rods with 150,000 PSI bolts
Hypereutectic pistons; 10.0 to 1 Compression
Hastings Moly rings
Hydraulic flat tappet cam
Melling high volume oil pump
Heavy duty double roller timing setCylinder Heads:
Performance aluminum heads
Hardened retainers and valve springs
2.02'' swirl polished intake valves
1.60'' swirl polished exhaust valvesCamshaft Specs:
Hydraulic Flat Tappet
Duration @ .050'' Lift: 229 Intake / 230 Exhaust
Lift: .480'' Intake / .486'' ExhaustOther Features:
New chrome valve covers
New chrome timing cover
New oil pan
Brass freeze plugs

Horsepower: 375
Torque: 400

I'm going to mate that up to a SPEC Clutch. Stage 1 or 2. With that and my 9 bolt rear with 3.73s, I should be able to pull right with a 5th gen considering the weight of those pigs.

Yes, i'm going to mate that to my T5 for the time being. Next year I'll T56 swap it.

[DynoDave]

At least at the time i had my 98 Z71 the HPTuner suite only supported 98+ pcms. I tuned my own truck with that software. I cleaned up the fuel trims, removed the delay for power enrichment, removed all torque management, and firmed up the line pressure a tad and wow what a difference. That truck went from barely being able to brake torque, to smoke-showing a set of 285 BFG ATs without any help from the brakes. Didnt really add any top end horsepower but the response and downlow grunt of that engine was incredible after i made those tweaks. Really miss that truck...

Thanks for that info. The Suburban could always use more low end grunt, especially when towing. Their current list still shows 98-00 Suburbans with 5.7L.

There are some pretty stout third gens on here now, so I'm going to need to keep up. I imagine it would suck to swap an engine just to be the slowest out there.

I am 90 percent sold on this motor. http://www.jegs.com/p/Blueprint-Engi...rPage=90&pno=1

That looks pretty sweet. Would love to have that kind of horsepower. You'll never be the slowest 3rd gen on this forum as long as I'm here!

[ruckusz28]

Us 3rd Gen folks need to hold each other up! It's like a cult.. or like being in a bad 80s band. We've got each others back lol

[TylerT/AZ28]

if its 3rd gens and 400s im def part of that club, btw if you do have a 400 i have just about every part for them under warranty =)

[Lucky SOB]

We've got each others back lol

You mean mullet?

[ruckusz28]

I'll cut yours if you cut mine

[ruckusz28]

Little bit of an upgrade. We will see how it helps. Needed brakes anyway and I got a smoking deal from a friend.

[Lortay5408]

Do want! Looks awesome!

[Darren]

Too small ��

looks great mike. Got me a motor yet? lol