Are there any major mechanical or electrical differences between '90 and '91 350 TPI IROCs? I have a '90, and I've found a service manual for a '91 and I was wondering if I should jump on it. Thanks guys!

 

The biggest difference with the '91 IROC is that it is imaginary...other than that..same damn car! =)

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-Red '88 IROC 5 Speed 305 TPI w/3.08
-Dual Friction Centerforce Clutch
-Accel 300+ Racing Ignition
-Accel 300+ Pro Sleeve Plug Wires
-Accel U-Grove Plugs
-Flowmaster Force II 3 Chamber Cat Back Exhaust
-Hypertech Chip
-Hypertech Airfoil
-Removed, Then Re-installed (out of fear) MAF Screens
-Gutted Air Box
-Best E/T 14.90, 60 ft. 2.17, 1/8th mile 9.61(bald tires, Code's 34,36)
-Best MPH 92.7(bald tires)

 

I believe the 91's are speed density. I think 90 is MAF right?

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Oh yeah! I forgot mine's the last ROC! Thanks for the answer about the differences though!

 

No, 90's are speed density as well, I dont know of any differences besides that they are z28s not ROCs. If there are they are probably pretty small



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90 IROC 5.7l (L98)
ram air, K&N's, air foil,Flows

 

The 90 and 91 are virtually identical mechanically. Dual cats were an option in 90 and standard in 91. Slight bump in compression I believe too with HP rated at 245 in 1991, due to the standard dual cats.

1990s are rarer due to only a half year model whereas 1991s are a 1 1/2 year. Originally, the 1992s were going to be a 4th Gen, but when they encountered delays, they decided to make a 1992.

The others are correct that IROCs were stopped on December 31, 1990. Some people claim there ARE some 1991 IROCs built just before December 31, 1990. I cannot comment.

 

if u are talkin about looks, the 91 have a different set of ground effects and rear bumpers. other than that, they are mechancilly similar.

daniel

 

Thanks for the help, guys!