1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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240 or 300?

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May 2, 2010 | 08:56 PM

#1

Boo-Boo

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240 or 300?

My 1966 F100 has a 1975 inline 6. But I'm not sure if it's a 240 or 300 and I don't see any obvious way to tell. Any suggestions?

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Old

May 2, 2010 | 09:11 PM

#2

BadCo_67

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If the original valve-cover decal is still there, you can decode it here:

1973-1979 Ford Truck Engine ID Tag Codes - FORDification.net

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Old

May 2, 2010 | 10:07 PM

#3

Tees77f150

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From: Halifx Pa

Here is a couple of pictures of my 1977 300 I6 for comparison, if that helps.

Bore, stroke, or valve size would be different.

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May 3, 2010 | 06:52 AM

#4

Boo-Boo

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Thanks Guys. Got no valve cover decal, but all the same it was nice to see Tee's engine. It's a beauty.

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Old

May 3, 2010 | 07:08 AM

#5

NumberDummy

Ford Parts Specialist

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From: Simi Valley, CA

Club FTE Gold Member

Quote:

Originally Posted by Boo-Boo

Thanks Guys. Got no valve cover decal, but all the same it was nice to see Tee's engine. It's a beauty.

If you are sure the I-6 is from a 1975, and the engine was original to that truck, it's a 300 I-6.

The 240 was canceled after the 1974 model year ended.

If you are not sure, you have to measure the stroke to tell the difference between the 240 & 300, since both use the same block and look identical.

Stroke: 240 = 3.18" / 300 = 3.98"

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May 3, 2010 | 05:37 PM

#6

Richards73

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From: Texas

what would we do without numberDummy

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Old

May 3, 2010 | 08:25 PM

#7

adamtheman16

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From: Anchorage, Alaska

Over at FordSix:

FORDSIX PERFORMANCE • View topic - Difference between the 240 & 300

FORDSIX PERFORMANCE • View topic - 240 or 300

FORDSIX PERFORMANCE • View topic - 240/300 Can You Really Tell The Difference By The Pulley?

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Tags

1975, 240, 240300, 300, difference, engine, f100, ford, i6, measure, motor, np435, strait, stroke, trucks

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