Considering V8 swap but want to leave rest of drivetrain alone

Discussion in '1947-1954' started by Chiro, Mar 14, 2019.

  1. Chiro

    Chiro Member

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    Hi all (and especially Evan because I'm certain he's done this in the past. :D).

    As stated above, I'm considering retiring my tired old 235 I6 and replacing it with a V8. Nothing outrageous, just something to get me down the road. I plan on using an early Corvette 265 left sided exhaust manifold (front dump) to clear the steering box so no crazy horsepower. I currently have a Muncie SM 420 4-speed (open drive) and a '72 Nova rear in it. Stock straight axle in front with Speedway disc conversion.

    I have heard of some people using a task force V8 bell housing to mate with the V8 because it has the rear mounts on it which will mate with the mounts on the cross member already in the truck which would keep the same trans I have and would eliminate the need to fabricate or purchase a trans mount (as I really want to use the trans I have). This also means I don't need to modify the firewall either from what I've heard.

    Anybody know what V8's would bolt to the above mentioned bell housing, what flywheel I need and what clutch I would use (hopefully the one I have now), etc., and so on?

    Has anybody done this or know of someone who has?

    Thanks,
    Andy
     
  2. coilover

    coilover Member

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    Andy,
    Have done a number of these and your plans are well thought out. IIRC your truck is a 55.2 so the TF bell housing should mate up to your angled cross member. The SM420 input shaft length and spline count is the same as the 235 but can't remember if trans to bell housing bolt pattern is the same but no biggy if not. The last V8/420 I used the bell housing was off a 65 GMC so trans bolted right up. When mounting the V8 have the left manifold on and position the engine so the little "dip" in the exhaust manifold is in line to give clearance between the inside top corner of the steering box and the manifold. Engine can then be centered in frame. If you carefully remove the mechanical temp sending unit from the six you can drill and tap the V8 coolant crossover and use your factory capillary tube rather than paying big bucks for an extended length one (picture). The easiest accelerator set up is the universal "spoon" type--$20. We use the Ford with the floating accelerator pedal and the integral return spring but it is more hassle to install. No shift rod fabbing with the 420 but you will need to make a clutch release rod. On any specific problem PM me. Our first shop truck was a 53 with a 265 that got the snot driven out of it for a number of trouble free years but really NEEDED better brakes.

    S10 054.jpg
     
  3. Chiro

    Chiro Member

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    Thanks Evan for responding so quickly. You are the MAN. My truck is a '55.1, not a '55.2 as you stated unless you made a typo and was thinking of '55.1 but typed '55.2 instead. If you meant '55.1 then is everything you wrote above the same?
    Thanks,
    Andy
     
  4. coilover

    coilover Member

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    I KNEW you had a 55.1 but brain was on vacation or fingers were drunk.
     

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