how do u find out if my irocz 350 tpi is the real thang

Asked by Jun 20, 2012 at 10:42 AM about the 1986 Chevrolet Camaro IROC Z

Question type: General

i have a 1986 i rocz with 350 tpi v8 t-top

8 Answers


Check the RPO codes on the service parts identification label in the center console glove box. The IROC package is an extra add on to the Z28 RPO so if it is a factory produced IROC and not a clone then Z28 and B4Z will be on the list of RPO codes on the service parts identification label. B4Z is the RPO for the IROC package. No B4Z = not a factory produced IROC.

4 of 4 people found this helpful.

the 305 small block also has a tuned port induction system, best way to find out is to measure throttle bore on throttle body, its smaller on 305


If you do research basic info says there were NO 350 IROC's in 1986. I did find in a couple places that there were 50 350 IROC's made for 86 but I dont believe they were for public sale. Of those 50 350 IROC's ZERO were T-Top cars. That would make your car not a true 350 car. a true 350 car will have an "8" in the 8th digit position of the VIN, it will have 4 wheel Disc Brakes, It will have an external oil cooler, It will have RPO code "L98", & a 700R4 4 spd auto trans. Thats just to name a few identifying marks of a 350 car

2 of 2 people found this helpful.

agree with tom and ttops wasnt an option with the 350 motors but it was with the 305s pay attention to detail earlier irocs decals were lager and on front bottom of door later one got smaller and moved to the back of the doors

1 of 1 people found this helpful.

T-Tops was an option w/ the 350 (5.7L) IROC's in 87-89 not sure about 90. IROC production was the lowest that year w/ total IROC production at 5507, 4213 Coupe's & 1294 Convertible's for 1990. A True IROC will have RPO code B4Z = IROC Package.


Just checked here: And it states the 350 was available in a 1990 IROC, & it also shows the 350 available on the 1986 IROC but only 50 of them.

1 of 1 people found this helpful.

not with the 86 model year for ttops option with 350

1 of 1 people found this helpful.

FYI on your question, In 1986, the IROC received slightly different engine packages. The 86 IROC is the armpit of the entire run. The 305 block in 1986 now had a one piece rear main seal. The TPI 305 was the lucky recipient of the LG4 camshaft, and the result was a drop of 25 horses and almost a half second longer run to 60mph. Chevrolet did allow 50 IROCs out the door with the 220HP L98 350 TPI, but word has it, it wasn’t for production release. Beware when somebody sells an 86 IROC-Z with a stock 350 TPI engine. CHECK THE VIN for accuracy. Chevy also let an undisclosed number of these cars out with the T5 (5-speed transmission) as part of the 1LE racing option that also included air conditioning delete, radio delete, as well as the deletion of all power accessories. The 1LE option was not available with T- tops, but did come with specially calibrated springs, shocks and sway bars. Visually, not too much changed on the 86 IROC. The government mandated 3rd brake light found its way to the top of the rear hatch near the roof line. Curiously, rear window louvers became a factory option this year. Some of the 86 IROCS came with the new 140mph speedometer. 86 was also the first year for the base coat/clear coat paint system as standard equipment. Should sum it up, note the first guy whom answer is correct upon stating the rpo codes, I have a true 350tpi orignal 1986 and he's mines legit, they are vary vary rare, thanks and hope this helps , God bless

1 of 1 people found this helpful.

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