Quote:
Originally Posted by shark
Jeff, I experimented with all of the above and found that the "open" spacer (birch wood - to help alleviate heat soak) worked best on my dual plane manifold. I tried alloy, phenolic?? & wood. Also, make sure that whatever configuration you use clears the butterflies - full open-closed. Not all butterflies and hole spacer sizes are equal. Ask me how I know....
Regards,... sharkey
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Good point, different engine/intake/carb setups may or may not gain by using a certain type spacer.....only real way to tell is try different ones on a dyno...........
Used to be a dyno shop almost within hearing of my house, saw the owner dyno a 600hp race motor, spent 2 days with different combos.... one carb liked one certain spacer and another carb like a totally different spacer........
As a general rule of thumb, single plane manifolds will do better with a 4-hole spacer and dual plane manifolds wil do better with a open spacer.......very general rules.......
David