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I'm converting from 2-BBL to 4. I have everything but the carb spacer and am unable to figure it out. Was the spacer the same from all 4-BBL cars? Does anyone know the correct part number for the spacer. I've seen spacers on e-bay and they'll say 289 and Hipo. Is the difference the pistons and heads only for the hipo compared to the non-hipo.
 

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Just the heads were different for the most part, cam and ex mani's and dist were different as well, the intake was exactly the same on both.

You would get alot better performance using an aftermarket intake though and you wouldn't have to buy that expensive spacer.
 

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The 4v spacer is the same for standard 289's and Hipo's. The original part number was C3OZ-9A589-C IIRC. Reproductions are available.
Scott
 
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