The set below came off an 87-88 Suburban. They had the 1 port per manifold emissions setup. I sealed them up by welding in a plug in each. I used them just to break in the motor in my 84 crew cab. They do have a heatriser though, with the flap removed. Do yours look like these?
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John
1984 C30 Chevy Crew Cab Dually
1998 Jeep Cherokee 4x4
2004 Chevy Trailblazer 4x4 (wife's)
1970 Mustang FB fully tubed (getting 521 BBF & powerglide)
1978 Nova 2dr (going BBCaddy & S.P. th400)
1984 Monte SS (circle track car)
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