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1406 / intake
We have a 69 gmc (duh) and what I did suprised people. I took an angle grinder to a 1985 350 manifold (q 4V) and opened up the holes to match each other(10 minutes). I also used an open spacer to improve response in our 307. The only glitch is to use thick gaskets on both mating surfaces and you will need slightly longer bolts to accomplish this feat. Works sooo very well!!!
warrens69gmc
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