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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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need help with swap

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Old May 7, 2008 | 02:00 AM
  #1  
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genolx722
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need help with swap

i'm going from a 300 inline to a 351m i my 77 f250 extended cab lwb truck. before anyone asks, i didn't go big block because the m was free and my 300spun a rod. what i'm needing to locate is the mounts on the frame that hold the engine motor mounts. through a little looking i've found out that i need the ones for a small block. my 300 frame mounts hold the engine about 2 inches to far forward and 1 inch to high to fit into the engine bay correctly. i've heard this was a seemless swap but even after moving the frame mounts back to the other set of factory holes, my z bar fo the clutch isn't even close. so if anyone one has these mounts or knows an aftermarket company to buy them from i would appreciate it, they are the only thing i have left before the motor is in.
 
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Old May 7, 2008 | 02:07 AM
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Originally Posted by genolx722
i'm going from a 300 inline to a 351m i my 77 f250 extended cab lwb truck. before anyone asks, i didn't go big block because the m was free and my 300spun a rod. what i'm needing to locate is the mounts on the frame that hold the engine motor mounts. through a little looking i've found out that i need the ones for a small block. my 300 frame mounts hold the engine about 2 inches to far forward and 1 inch to high to fit into the engine bay correctly. i've heard this was a seemless swap but even after moving the frame mounts back to the other set of factory holes, my z bar fo the clutch isn't even close. so if anyone one has these mounts or knows an aftermarket company to buy them from i would appreciate it, they are the only thing i have left before the motor is in.
Welcome to FTE

2WD?? The following info is for 2WD only.

1977/79 F100/350's with 351M/400's use the same engine mount brackets (aka perches, stands) as 1973/79 F100/150's with a 302 use.

Info source: 1973/79 Ford Light Truck Parts Catalog.

These brackets are OBSOLETE. No Ford dealer has any / Obsolete parts sellers: Green Sales & Dennis Carpenter don't have any either.

They may be available aftermarket, but I'm not privy to that info.

My guess is...you'll have to find used ones.
 
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Old May 7, 2008 | 05:41 AM
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Ckeck out the sponsors on the left- Bronco Graveyard or Mike's Truck Salvage- just click on the name.
 
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Old May 7, 2008 | 09:29 AM
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I assume you have the trans with the 351M, the M has the big block bell housing and will not connect to a 300 ar small block tranny.
 
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Old May 7, 2008 | 01:07 PM
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yeah i have an np435 and got the big block bell housing for it
 
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Old May 7, 2008 | 08:43 PM
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thanks guys, i found the mounts at a local junkyard. they cost me 20 bucks but i figure thats pretty cheap since it was the only thing i needed for the swap. 20 bucks may have been a little high, but that brings the total swap price to 20.85 (.85 cents at rural king for new bolts and nuts). thanks
if you guys know anyone needing help with small blocks or transmissions tell them to pm me, thats about the only stuff i'm good at lol
 
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