I have an 89 Formula. The stock intake manifold has a casting # of 10108449. I just got another TBI manifold to play with and it has a casting # of 10166133. Anyone know what the difference is? It only looks different in that the new one doesn't have cross pattern over the thermostat. New one is from a 350 I think, but is there going to be any internal or flow difference?

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1989 Firebird Formula L03
Black with 5-Speed
Stock with Functional Formula Cowl Induction, Centerforce Clutch, KYB GR2 struts and GAJ shocks, 89k on the clock and running smooth.

 

probably not. most likely just different years or something like that, i dont think they put much effort into manifold design for tbi. just whatever worked. no flowbenching or anything i bet.

 

I didn't think so, but wanted another opinion. Thanks.