Same engine, bigger bore if I remember correctly.  One year size, used in 54 Mercs and 54 Ford police specials.





54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Interesting. I knew heard of a 256 Y Block.  Was it the same motor?

Well that would explain a 4.86 rear drive ratio in the calculator. With a 4.86, it would be the quickest 239 from stoplight to stoplight anybody ever saw.

Oops, I knew the merc’s had a 256. Chalk that up to old guy memory.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Miker.  The '54 Mercs had a bigger version of the '54 Ford 239 V-8.  It was a 256 with a 4 barrel Holley.  I'm not sure if the model of the Holley was 4000, but it looks like an early version of one.  Like the '55 Ford and Merc intake manifolds, the automatic choke affixed to the intake manifold rather than to the Holley carburetor body.

Interesting that like in the flathead days, they ran a bigger V-8 in the Mercs than the Fords.  That said, the '50s Mercs looked heavier than the Fords to me. 


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

I am still wondering IF the Transmission is shifting to 3rd? Never heard back if the Throttle Pressure Rod has been checked.

  

As to the gear ratio, here’s a calculator. Guessing at a 28” tire, and plugging your numbers in (rpm mph) it came back at 4.86 to 1. I doubt that, but anything is possible. Anything over 3.9 or so would have been a manual overdrive transmission, so next question is what transmission do you have. Also is it 239, or was a 6 available in that car that year. I know next nothing about 54’s and less about Merc’s but more knowledgeable folks will chime in.

https://www.summitracing.com/newsandevents/calcsandtools/gear-ratio-calculator


miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

I found an old AACA Question regarding 54 Mercury Tank. 54-56 Ford will fit with some modifications. Repro Tanks are available for Ford for most 50's Models from several Sources including Macs, Rock Auto etc.

  

Will a 54 Ford tank work? 
https://www.ebay.com/itm/Gas-Fuel-tank-for-52-53-54-Ford-passenger-cars-1952-1953-1954-Fairlane/352415198084?epid=28021811444&hash=item520d952b84:g:4HIAAOSwXVNbWc5d:rk:41:pf:0&vxp=mtr


Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Looks like they are not yet reproducing them. A Gas Tank from 53-56 Ford will work with some Mods.Your best bet would be find a Shop that repairs and reconditions Gas Tanks and have yours repaired. Many Rad Shops also do Gas Tanks..

  

I’ve owned my 54 Monterey two weeks now, drives wonderful rear gear is high,screams at 60 mph 3500 rpm. Any suggestions? Also my gas tank has been damaged, my guess is I need a new one. Any suggestions there also.