300 transplant
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New User
Joined: Sep 2013
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300 transplant
Hey guys, I'm brand new to posting, but have seen that there is a wealth of info here and want to leverage as much as i can before tackling another project. I appreciate any insight y'all may be able to provide to help me avoid any unforseen pitfalls.
What I got: 1967 f-100 stepside with 300 & 3 on the column &
1996 f-150 with 300 and automatic with LPG conversion.
What I want to do: Install the newer LPG engine into the 67 truck because I will gain:
1) alot newer engine with low miles that has been run on propane all its life (very clean inside)
2) serpentine belt setup
3) A/C compressor
4) An LPG engine in a "sunday driver" truck (no more bad gasoline)
Questions :
1) Will the old three speed tranny bolt up to the newer block
2) Will the flywheel from the old 300 work on the new one to replace the flexplate when going from auto to manual tranny
Thx for any help you can provide
What I got: 1967 f-100 stepside with 300 & 3 on the column &
1996 f-150 with 300 and automatic with LPG conversion.
What I want to do: Install the newer LPG engine into the 67 truck because I will gain:
1) alot newer engine with low miles that has been run on propane all its life (very clean inside)
2) serpentine belt setup
3) A/C compressor
4) An LPG engine in a "sunday driver" truck (no more bad gasoline)
Questions :
1) Will the old three speed tranny bolt up to the newer block
2) Will the flywheel from the old 300 work on the new one to replace the flexplate when going from auto to manual tranny
Thx for any help you can provide
Junior User
Joined: Nov 2012
Posts: 58
Likes: 0
From: Central KY
3yalbrecht,
Sounds like a neat project! Take some pics and let everyone know what you do.
Regarding your questions:
I believe all of the 300 blocks had the same bolt pattern(small block), so I would think the answer to question 1 would be yes.
I would think that you could move the flexplate from the old to the new as well, but someone else may jump in with more info.
Sounds like a neat project! Take some pics and let everyone know what you do.
Regarding your questions:
I believe all of the 300 blocks had the same bolt pattern(small block), so I would think the answer to question 1 would be yes.
I would think that you could move the flexplate from the old to the new as well, but someone else may jump in with more info.
Lead Driver
Joined: Dec 2000
Posts: 6,298
Likes: 47
From: South central, Minnesota
Personally I would just swap the accessory drive parts and manifolds off the 96 engine onto your 67 engine. The 67 is a stronger engine.
But if you really want to swap engines first check and make sure your 96 block has the boss on the engine block for the clutch Z-bar pivot ball. With out it, make your clutch work is going to be very difficult. If it has the boss for the clutch pivot ball then you'll need to swap the block plate, bell housing, flywheel, clutch, and starter from the 67. And don't forget to install a pilot bushing/bearing in your 96's crank.
But if you really want to swap engines first check and make sure your 96 block has the boss on the engine block for the clutch Z-bar pivot ball. With out it, make your clutch work is going to be very difficult. If it has the boss for the clutch pivot ball then you'll need to swap the block plate, bell housing, flywheel, clutch, and starter from the 67. And don't forget to install a pilot bushing/bearing in your 96's crank.
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Thanks for the tips,
I forgot to mention in earlier post that the 67 engine is sick and needs work ( I believe burned valves) another reason for the swap..
Whats the common concensus of pilot bearing vs bushing??
I've heard pros and cons of both, but tend to lean toward the tried and true ruggedness of the bushing myself.
I forgot to mention in earlier post that the 67 engine is sick and needs work ( I believe burned valves) another reason for the swap..
Whats the common concensus of pilot bearing vs bushing??
I've heard pros and cons of both, but tend to lean toward the tried and true ruggedness of the bushing myself.
Lead Driver
Joined: Dec 2000
Posts: 6,298
Likes: 47
From: South central, Minnesota
Thanks for the tips,
I forgot to mention in earlier post that the 67 engine is sick and needs work ( I believe burned valves) another reason for the swap..
Whats the common concensus of pilot bearing vs bushing??
I've heard pros and cons of both, but tend to lean toward the tried and true ruggedness of the bushing myself.
I forgot to mention in earlier post that the 67 engine is sick and needs work ( I believe burned valves) another reason for the swap..
Whats the common concensus of pilot bearing vs bushing??
I've heard pros and cons of both, but tend to lean toward the tried and true ruggedness of the bushing myself.
It still might be easier/cheaper in the long run to fix the 67 engine. Rebuild the top end( install hardened seats ) and convert it to LPG.
I lean towards the pilot bushing too. But not everyone does that's why I mentioned both the bushing and bearing.
Senior User
Joined: Aug 2010
Posts: 330
Likes: 0
From: Sacramento
Are you sure the 67 is a 300 and not a 240? I'd just rebuild the head on the one in the truck and be done, its alot easier to swap a head on that old truck then to swap the entire engine. The head I put on my 72 was a 64 and it didn't need hardened seats but it wouldn't hurt.
Lead Driver
Joined: Dec 2000
Posts: 6,298
Likes: 47
From: South central, Minnesota
The 240's and 300's came stock with flame hardened seats. But if he has the head rebuilt and plans to run LPG it's cheap insurance to have it done.
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Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
The 1996 engine should be more powerful because of the EFI. They did have some earlier units in the 60s/70s with forged crank for HD usage and all the older 300s had metal timing gears. There was a problem with rockers backing off their studs that was fixed some time I think late 1970s. My 77 had them back off, once the rocker fell off as I drove down the road. All in all, I would take the EFI engine for a stock engine application. But to build a performance engine the 67 might be a better choice. Hey, it will be spare and has issues, why not make a side project to build the 67 while running the 96 for now.
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