Quote:
The thickness of the spacer matters, too. It depends on your engine build and health. The 360 in my W150 needed 1.25". The poly 318 in my 64 Fury needed 1/2". The 440 in the Charger was 1".
Was each of them OK w more than that but needed at least your posted thicknesses in each instance to avoid percolating? I have a streetmaster (very small runners/fairly small plenum) which is touted as a mileage intake tho it is decades old school and is an open plenum and my heat riser is inop. Any thoughts? ('83 318 in a 65 dart)
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