240 to 300 conversion

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Mar 2, 2006 | 08:44 AM

Gatsby

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240 to 300 conversion

I was parking at work the other morning when I heard a most disturbing sound coming from under the hood of my 1966 F-100. My first thought was that the sound was coming from the valve train area (needless to say, I shut the engine off immediately when I heard the calamity). I had the truck towed to a shop and a mechanic looked under the valve cover--all was well. The mechanic thinks I have either, or possibly both, a torn piston skirt or a wrist pin problem. With that scenario, I expect to have cylinder damage as well. I have been looking for a used 240 block (same engine that's currently in the truck) and have not been able to find one. I have found plenty of 300 blocks. Are my 240 parts (crank and bearings, rods, pistons, cam, pushrods, distributor, etc.) completely interchangable with the 300 block? Also, does anyone know of a good detailed manual for working on a 240/300 (tearing the motor down and putting it back together)? I have never been into an engine before so this will be a first for me. Any help you can offer on these issuess is greatly appreciated!

Mar 3, 2006 | 03:02 AM

Col Flashman

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From: La Verne, California

The 300c.i.er is a Bored & Stroked 240c.i.er, so a lot of the internals wont fit as you'd wish them to.
The '66, 240/300 I-6 Ford Shop Manual has all the intel you need on tearing down & putting back together either of those engines.

Mar 3, 2006 | 08:46 AM

Gatsby

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I am unable to find the manuals specifically for the 240/300 I-6. Many sites carry the Ford Shop manuals for the V-8's or chassis, maintenance, and/or electrical manuals. Do you know of a vendor that carries the Ford Shop manual specifically for the 240/300 I-6 engines? thanks for your help.

Mar 3, 2006 | 03:14 PM

Col Flashman

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I just did a search on e-Bay & found this,
http://cgi.ebay.com/FORD-240-300-361...QQcmdZViewItem

Contact this Seller about a Shop Manual,
http://cgi.ebay.com/ebaymotors/Ford-...spagenameZWDVW

Mar 4, 2006 | 08:08 PM

stresssolutions

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From: Rochester, MN

I've got a 240 in a 66 custom 500 4 door sedan, been sitting in a field for 13 years though, with nothing done to it. Sad, I had overhauled it just a few years earlier, but it was not running right when parked. Coil or condenser or soemthing.

A 300 will bolt in, in place of the 240...bellhousing and motormounts are the same.

Good luck

Mar 4, 2006 | 10:20 PM

ptmilan

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The 240 and 300 use the same block. Only the internals are different (crankshaft, rods, etc). The 300 is a direct bolt in replacement, so that would be the best choice given the power increase. You might have to change to a bigger clutch. Some 240s had a smaller clutch than any of the 300s. A 300 could be converted to a 240, but for the same money you can have 60 more cubic inches.