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Old Nov 20, 2005 | 10:57 AM
  #1  
savage066's Avatar
savage066
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Mountain Pass
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From: Maryland
240 or 300?

hey...i looked around for a while, and i couldn't find the answer to this question.
i just picked up a 1966 240/300 long block for free, but i don't know what it came out of, and neither does the guy i got it from. it's defintely a truck engine, but is there a way to tell if it's a 240 or 300? i'm going to build it up for higher compression and drop it in my '79. anyone knwo of anything i should watch out for, other than it being ancient?
 
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Old Nov 20, 2005 | 12:00 PM
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fordflaresides
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From: Tucson, AZ
measure the stroke, a 300 is around 4", shorter is a 240
 
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Old Nov 21, 2005 | 07:48 AM
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77300i6
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Usually, 240's have 2 grooves on the crank pulley & 300's have 3.

The stroke test works good too, in fact its 100% reliable.
 
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Old Nov 26, 2005 | 12:33 AM
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ptmilan
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Some 240's have the 3 groove pulley. My 240 has 3 grooves, which may be because it came from a car with the dealer added Ford AC.
 
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