I suppose it depends on what you want to do with it. If it needs repainting anyway, or if you plan on selling it, you'll need to have the part number. How you expose it would be up to you, but I would probably use a stripper before I would sand, it if it were mine.

JR

The rubber lip part of the tail is HUGE !! much larger than 76-77 turbo. You can lay an all fiberglass IROC tail on top of the rubber lip RS 3.0 tail and they have the same dimensions (within a few mm)
The RS 3.0 rubber lip tail is the same one fitted to the 75 RSR

So I sort jumped around in this thread, but getting back to the original question; I've always understood that '73 IROC cars did NOT have any vents and the '74 RSR cars (as there were no more IROC cars after '73) have the vents.

Correct, the IROC RSR was essentially a stripped RS 3.0 with a high butterfly 3.0 twin plug RSR motor, 9 and 11 fuchs. steel 9 and 11 " flares (NO vents)

Sorry to hijack, but one more question to you guys in the know. This tail is all fiberglass where as the early 930 tails had a metal base? Is this correct?

I've never seen an all fiberglass tail, but there are some that claim to have seen them. I don't think there are that many, if they do in fact exist, so I don't think your chances are very good, given how many replica all fiberglass tails do exist. There's only one way to find out, so start looking for part numbers and start posting detailed photos of what you have.

JR

On my way to hardware store to strip the paint photos incoming. This is definitely all fiberglass and there is definitely a part number under..... I'm very excited!

http://i740.photobucket.com/albums/x...ps52xypr4q.jpg

930.512.010.00

That picture was taken when the original 15 IROC cars were delivered to the docks in Germany for shipment to the US. It is credited to 'Porsche Factory'. The cars were delivered to Roger Penske
not that these are the original IROC which were delivered w/ Ducktail spoilers. These were replaced before race day w/ the long version of the whale tail.

Well, it's not a '74 3.0 tail. The part number would indicate that it's an early turbo tail but I'll leave it to others to decide if it's original, or not.

JR

Though built in '73 these IROCS are based on the MY74 chassis. The basis was the '74 Carrera 3.0RS

The flairs are similar to the earlier 1973 2.8RSR and later 930, for MY74 the RSR used the 2" wider vented flairs

Interesting that this should be revived

Taken this AM on it's way to Limerock for historic display at the IMSA races


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http://forums.pelicanparts.com/uploa...1500670801.JPG
http://forums.pelicanparts.com/uploa...1500670801.JPG
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My tarmac rally 3.5 litre IROC clone. To the letter of the rules in Australia, which keeps it close to IROC spec, other than later brakes and 17" wheels. Just the most 911 fun you can have. The IROC/74 RS spec is an example of when the factory got it absolutely right. Apologies for interloping.


http://forums.pelicanparts.com/uploa...1500900138.jpg

[QUOTE=Bill Verburg;9671398]Though built in '73 these IROCS are based on the MY74 chassis. The basis was the '74 Carrera 3.0RS


much like the prototype 73 frankfurt 930 turbo, i seem to recall some of the early 3.0RS were built off of 73 tubs but dressed up with the G series parts for the impending bumpers cars that followed? the IROCs certainly were...


for the OP some of the differences on the IROC flares with factory pics...

http://forums.pelicanparts.com/porsche-911-technical-forum/906851-wheel-sizes-1974-3-0-rs-other-questions.html

excellent looking track car!

Thanks. We have a lot of fun tarmac rallying the little black beast.
http://forums.pelicanparts.com/uploa...1500972868.jpg