240 rebuild
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240 rebuild
I'm planning to rebuild my 68 240 I6 engine. The man I bought it from said he rebuilt it twice and has already bored it .40 over. I was wondering if it's safe to bore it .60 over. I was also wondering if putting a 300 head on the 240 would improve performance in any way.
Lead Driver
Joined: Apr 2011
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From: El Dorado, Arkansas
I'm planning to rebuild my 68 240 I6 engine. The man I bought it from said he rebuilt it twice and has already bored it .40 over. I was wondering if it's safe to bore it .60 over. I was also wondering if putting a 300 head on the 240 would improve performance in any way.
My '69 F100 240 has plenty of wear on it (best I can figure 175K miles if not more). I seriously doubt it's ever been rebuilt and it still keeps on keeping on. These engines would have to be very dilapidated to require a rebuild, let alone two. --not saying it isn't possible but, seems improbable.
Just the opposite with respect to a head swap. 240 head on a 300 is an upgrade.
Personally, if I was going to keep a six cylinder in my truck, I would swap to the stronger 300.
Lead Driver
Joined: Apr 2011
Posts: 6,399
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From: El Dorado, Arkansas
This choice is up to you but, if I was to buy an engine, I wouldn't be investing money on one that's at the brink of being completely used up.
Like John said, you can get an '87-'96 4.9L (fuel injected 300) engine (carburet it if you want to) and rock on. Part change for part change, you'll never get 300 power out of a 240.
Like John said, you can get an '87-'96 4.9L (fuel injected 300) engine (carburet it if you want to) and rock on. Part change for part change, you'll never get 300 power out of a 240.
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I've got a carbeurated 300 but its slam full of water and would need rebuilding too and I've already got the 240 apart and I just figured it would be an easier process to rebuild it instead of repeating the same process all over on the 300. Im not looking for power, I just want it to run and be a daily driver.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
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From: Cupertino
Jeff, boring sixty over is not a good idea. You could end up with a water boiler or a cracked jacket from weakening the walls.
These blocks are plentiful and cheap. Why take a risk for $150 or so?
These blocks are plentiful and cheap. Why take a risk for $150 or so?
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Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
2X. To make that motor dependable you would have to Sleeve the block. That's prolly more than the $150.00 investment of the engine.
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