87 5.7 iroc z runs hot, help please?!

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Jul 3, 2011 | 02:24 PM

zz's z28

Thread Starter

Junior Member

Joined: May 2008

Posts: 99

Likes: 0

From: rockville, md

Car: 1987 Iroc Z

Engine: 383 Mini ram

Transmission: 700r4

Axle/Gears: borg warner 9 bolt

87 5.7 iroc z runs hot, help please?!

I have an 87 iroc z with the l98 350 engine in it.

Its been getting up past 210, and while driving conservatively it runs between 220-230 deg.

Ive replaced the thermostat with a 160 deg, replaced the water pump, and radiator cap.

The fan is wired to stay constant.

IT doesnt have an air dam, but im not so sure that could be causing all of this.

Is this something to worry about? i dont know whats actually considered "overheating"

Any help/ideas would be much appreciated!
!!

Jul 3, 2011 | 06:22 PM

UnderCover89TBI

Supreme Member

iTrader: (25)

Joined: Feb 2006

Posts: 7,260

Likes: 5

From: Manteca,California. Nor Cal.

Car: SOLD IT. Mopar guy only now.

Engine: gone

Transmission: gone

Axle/Gears: gone

Re: 87 5.7 iroc z runs hot, help please?!

Gotta have the air dam and baffle or you will have a bunch of cooling problems. Id put a 180 stat in there too.

Jul 3, 2011 | 08:58 PM

theNMBR27

Senior Member

Joined: Sep 2009

Posts: 516

Likes: 1

From: Downers Grove, IL

Car: 91 Z28 / 04 GTO

Engine: GMPP 350 TPI / LS1

Transmission: WC T5 / T56

Axle/Gears: 3.23 / 3.46

Re: 87 5.7 iroc z runs hot, help please?!

+1 the 160 is way to cold and the air dam is a must.

Jul 3, 2011 | 09:30 PM

Pab's

Member

iTrader: (2)

Joined: Oct 2010

Posts: 230

Likes: 0

From: San Antonio, Tx

Car: 1988 IROC-Z

Engine: 5.7 TPI with zz4 heads

Transmission: 700R4

Axle/Gears: 9 bolt BW

Re: 87 5.7 iroc z runs hot, help please?!

I had the same issue and trust me its the AIRDAM I dint believe that a little piece of plastic wold work better than an aluminum radiator and 3000 cfm fan