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By BudMan - 13 Years Ago
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I recently acquired an Edelbrock FM 255 dual quad manifold with Edelbrock 1404 carbs. As usual, I did not do my homework prior to buying, although I got it fairly cheap. I have since found that the FM255 manifold was designed for small port heads as found on '55-'56 y-blocks. It was replaced by the FM257, designed for use with large port heads as found on '57 and up y-blocks. Will the fm255 work on large port heads?
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By Hoosier Hurricane - 13 Years Ago
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For street use and the "WOW" factor, it will work fine. For all out HP with a big engine, it will lack a little compared to the 257 at higher rpm.
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By Vic Correnti - 13 Years Ago
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I had my stock 255 and stock 257 on Ted's dyno last year using the same 500 cfm Edelbrock carbs on both with the aluminum heads and there was a 23 hp difference. I will also add that I ran the 255 for over 25 years, many scrubs passed thru that intake.
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By BudMan - 13 Years Ago
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um..........What's a scrub?
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By Vic Correnti - 13 Years Ago
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GM product!
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