OKAY. I bought an '89 Z28 from this 22 year old kid for $5500. he claims he did the build on the truck block with his shop instructor a few years back and has no paperwork. Apparently the car sat for a couple years which is why it has such low miles (supposedly). I had a mechanic verify everything and he stated the drivetrain looked less than a year old...tranny and all. But how much can you really tell without taking off the heads and all that stuff???


Info:
1989 IrocZ28
Originally a 305TPI Auto

Powertrain Info
350 c.i. 1 piece seal truck block
New .030 forged federal mougal pistons. Approx compression is 9.9 : 1
Block and Crank were magged.

New Crane Hyd Flat Tappet Cam, .450 lift, 238 dur.
New Crane springs, keepers, retainers, pushrods, and double roller timing set.
New Proform 1.5 ratio roller rockers.

New melling high volume oilpump
New high volume water pump
New chrome oil pan and timing cover

Vortec "Ramp" style Heads
Ported and Polished. 5 angle valve job.

TPI is still stock parts, but has a killer powdercoat job, ask for pics.
PCMs For Less custom chip

700r-4 with B&M Stage 2 shift kit
Mild Stall Converter
Engine and Tranny have less than 15000 miles on them. Body has under 160,000.

Other Chassis info...
Hotchkis Frame Connectors
B&M Tranny Cooler
Ceramicoated Shorty Headers, Custom 3" exhaust with Flowmaster Muffler
Deleted Air pump
3 core copper/brass higher capacity radiator w/ dual electric fans


Problem:
when starting for the first time (cold start) it takes a few seconds to turn over and once it finally does fire I can only keep it running by giving it gas. The idle immediatly drops to around 400rpms and bogs out if I don't give it gas. I can drive the car and the engine runs fine after a couple minutes. I drove the car for a few hours and shut it off and on about 10 times in a 4 hour period and didn't have one problem.

I'm thinking this has something to do with the IAC valve or one of the a/f regulators/sensors. Any suggestions?

Also. Where can I go to get the compression checked on this thing?? Does that cam seem right? I can't seem to find that particular model anywhere.

And lastly. What do you think this thing should be running in the 1/4 mile with all the mods listed?...street tires...stock tb...stock injectors...stock rear-end with 2.73 gears...etc...

 

if you gotta open the throttle blades to keep it running id guess the iac, But could be other things as well