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Edelbrock FM255 vs. FM257

Posted By Florida_Phil 2 Months Ago
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Florida_Phil
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I understand an Edelbrock FM255 intake manifold will mount two Holley 4100's straight.  I would like to use two Holley 465s with adapters.  I have been told an Edelbrock 257 would require side mounting 4100s. I understand the FM 255 was designed for small port heads.  Will a FM255 and two Holley 4100s mounted straight work with 1957 "G" heads on the street.  Thanks!
KULTULZ
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Will a FM255 and two Holley 4100s mounted straight work with 1957 "G" heads on the street. 


The 4100 was a FORD carb (designed by HOLLEY). Are you describing the actual 4100 or the HOLLEY 4150?

http://forums.y-blocksforever.com/uploads/images/a348d977-fa40-42a9-9667-9480.jpg

http://forums.y-blocksforever.com/uploads/images/98c2716b-8304-4658-b49d-2862.jpg


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Florida_Phil
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Sorry about that.  The carbs I want to use are 4160 465 cfm. 

http://forums.y-blocksforever.com/uploads/images/88089d17-3ed8-4806-a310-2a96.jpg
charliemccraney
Posted 2 Months Ago
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While the 255 has medium ports, it will work and in fact, it was the top performer in Ted's 2x4 testing.

http://www.eatonbalancing.com/2014/01/17/y-block-ford-dual-quad-testing-on-aluminum-heads-part-ii/



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Florida_Phil
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I saw that.  Anyone ever tried that combo on the street?
KULTULZ
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The carbs I want to use are 4160


Here is a photo of the FM255 with either 4150's or 4160's. It looks like it will definitely take two 4160's.

http://forums.y-blocksforever.com/uploads/images/4fb49315-9a24-47ec-a315-611e.jpg


http://forums.y-blocksforever.com/uploads/images/3a8b9b51-7d57-4505-86fd-97f4.jpg

http://forums.y-blocksforever.com/uploads/images/d7b60bad-a7a7-4594-b04e-4290.jpg


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Florida_Phil
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I think this would be a nice street combo.  It has the right look and the vacuum secondaries would keep the cfm down. I tried three old Holley 94s and I couldn't deal with those old carbs. I have a new 4160 on my car now.   I'm pretty sure this would fit under the hood of my TBird.  Anyone got a spare FM255?
Lord Gaga
Posted 2 Months Ago
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I have a FM 257 on a 322" Y running two 550 CFM 4160s.  Works great on the street and strip.
Use 427 FE dual quad linkage and don't forget to connect the vac. secondaries together using the lids with the vacuum hose fittings as used on the 427 425 HP FEs! 

"FREE SAMPLE"
KULTULZ
Posted 2 Months Ago
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I'm pretty sure this would fit under the hood of my TBird.


The rear carb pad on the FM255 and/or 56 MERC ECZ-C ALUM intake sets back farther than the 56-57 FORD ALUM intakes. Just to let you know.


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Florida_Phil
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I assume this means I won't be able to use my road draft tube and will need breathers in my valve covers?  I assume a stock 57 distributor will clear?


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