What size engine came in 90 IROC?
Thread Starter
Registered User
Joined: Oct 2000
Posts: 184
From: Hartwell,GA,USA
What size engine came in 90 IROC?
If 305/350s were in them, how do u know which one is which? It has ram air and a 5 speed. Thanks Alan
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97 Black Z28 Convertible
A4 & 3.42
MODS ARE
Ram Air Hood with Airbox, K&N Air Filter, FLP Longtubes, Brola CatBack, 160 PowerStat, 224/236@50,.536/.555,114LSA, mildly ported heads, CSI water pump, LS1 DS, Descreened MAF, LT4KM, Air Foil, !TB, Jamex Springs, KYB-AGX Shocks, STB & SFC, Transgo Shift Kit, Yank ST3200
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97 Black Z28 Convertible
A4 & 3.42
MODS ARE
Ram Air Hood with Airbox, K&N Air Filter, FLP Longtubes, Brola CatBack, 160 PowerStat, 224/236@50,.536/.555,114LSA, mildly ported heads, CSI water pump, LS1 DS, Descreened MAF, LT4KM, Air Foil, !TB, Jamex Springs, KYB-AGX Shocks, STB & SFC, Transgo Shift Kit, Yank ST3200
Registered User
Joined: May 2002
Posts: 332
From: Amarillo, TX
If its a factory 5 speed its a 305...no 350's came with the manual tranny. They were all auto's.
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White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, Hedman Hedders, and a few other goodies
...soon to have an LS1 and 6-speed!!!
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White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, Hedman Hedders, and a few other goodies
...soon to have an LS1 and 6-speed!!!
Registered User
Joined: Jul 2002
Posts: 479
From: Clearwater, Florida
If it came stock with a 5-speed, it is a 305. If it's automatic just about the only way you can tell is by looking at the VIN number. It's on the bottom drivers side while looking in from the outside of the car. If the 8th number is an "8" than it is an l98 (350).
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1990 IROC-Z 5.7l
1/8: 9.06 at 76.39 mph with a 2.02 '60
- dual exhaust, underdrive pulley, 160 stat
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1990 IROC-Z 5.7l
1/8: 9.06 at 76.39 mph with a 2.02 '60
- dual exhaust, underdrive pulley, 160 stat
Registered User
Joined: May 1999
Posts: 302
From: Pittsburgh, PA
BTW, there is no ram air on there...
If the 8th is a F, then it's the 305.
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-Steve
93 Mustang GT 14.6@95 5PNTSLO
89 Camaro IROC-Z Sold 6/29/01
SCR State College Rides
If the 8th is a F, then it's the 305.
------------------
-Steve
93 Mustang GT 14.6@95 5PNTSLO
89 Camaro IROC-Z Sold 6/29/01
SCR State College Rides
Registered User
Joined: Sep 1998
Posts: 642
From: Atlanta, Ga
It should be a 305 then, with the 8th digit of the VIN an F like mentioned above.
Look under the car, and if it has dual cats it will have 3.42 gears out back and is rated at 230hp. If it only has a single cat it will have 3.08s I believe with 205hp. The dual cat 305 TPI 5spd cars are actually pretty quick stock, keep up with the 350s well.
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Ray87Z on newer boards
-Vortec headed 350
86 IROC (retired to brother)
-cammed 305 TPI in the IROC.
http://www.inter-scape.com/Ray
Look under the car, and if it has dual cats it will have 3.42 gears out back and is rated at 230hp. If it only has a single cat it will have 3.08s I believe with 205hp. The dual cat 305 TPI 5spd cars are actually pretty quick stock, keep up with the 350s well.
------------------
Ray87Z on newer boards
-Vortec headed 350
86 IROC (retired to brother)
-cammed 305 TPI in the IROC.
http://www.inter-scape.com/Ray
Registered User
Joined: Aug 2002
Posts: 29
From: orlndo, florida usa
<font face="Verdana, Arial" size="2">Originally posted by Alan566:
If 305/350s were in them, how do u know which one is which? It has ram air and a 5 speed. Thanks Alan
</font>
If 305/350s were in them, how do u know which one is which? It has ram air and a 5 speed. Thanks Alan
</font>
just thought id help..
thanks again guys.
Dan
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