I believe it was just a running change the factory made when they first started building the cars. Functionally I don't believe there was any difference, just cosmetically. I can't remember which is more rare, but I think it was the 4 rib version.
[B]redtanrt10[/B] is correct. A few more details: The original Gen1 Viper intake manifolds manifolds had 4 stripes on each side. They were sand cast aluminum plenums with shaped aluminum oval tubes in between, all salt-bath braised from a company in Ohio named Winters (they also did the blocks and heads). We made a running change to a single sand cast aluminum manifold casting. The weight was a little heavier, but easier to make and performance was identical (or pretty darn close).
I was part of the Viper engine design team back then. Best job of my life!!
Heine_Co I was a very lucky guy who spent 23 of my 31 years at Chrysler/FCA working on the progression of Team Viper through SRT. Mostly engine design for Gen1-3 & Gen5 of Viper then internals of the Hellcat & Demon engines; with a short stint as SQ manager at the Conner Viper vehicle & engine plant. AND I have a a '97 GTS in the garage. Yes, VERY lucky!!
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