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Only thing I can think of would be water pump inlet, and pulley alignment. Use the timing cover,pullies and water pump from the 318 and that should eliminate that problem. If you swap timing covers,put a new timing set on the 273 while it's off.

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69 and prior should have the same parts on a 273 and a 318.

IIRC it was 1970 when the changed the water pump outlet to the passenger side.

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What problems will i run into changing from a 318 to a 273 in my 66 pickup? Thanks

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Good catch! I forgot about that one.

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Yes that one can cost alot of If you miss it

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the 273 will have to work harder and therfore get worse milage in that truck.

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Mabey he has a bad 318 in his truck and happens to have a good 273 sitting around. Mabey he just wants better MPG and don't mind the performance hit, it could be lots of reasons.

He will get better miledge and it will take longer to get an equal sized load going. My 239 in my dakota gets way better miledge than my 318 dakota even towing a 67 cuda on a flat bed but it was working a lot harder going up mountain passes. As a matter of fact the little motor truck only got one MPG less loaded than the V8 did un loaded.

As for the converter you can get one made with the small hub and regular 904 guts. You could also swap cranks.

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I guess the argument goes back to the AGE OLD comparision of balance between HORSEPOWER vs. TORQUE. Throw into the mix: BSFC, Vehicle weight,
gearing, tire/front end science, C of G, and so on
and so forth, and you have ENDLESS possibilities on the mileage/power factor. YOU BOTH are RIGHT in your RESPECTIVE ways, since there are no CONCRETE standards to base the "theories" on. Everything Detroit builds is based on a COMPRIMISE, and IF you guys still are at odds, settle this at the TRACK. AT least there you can have a laugh or two, as well as BRAGGING RIGHTS!!
A MERRY CHRISTMAS and HAPPY NEW YEAR to all!! And God Bless us, every one!!

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Mabey he has a bad 318 in his truck and happens to have a good 273 sitting around. Mabey he just wants better MPG and don't mind the performance hit, it could be lots of reasons.

He will get better miledge and it will take longer to get an equal sized load going. My 239 in my dakota gets way better miledge than my 318 dakota even towing a 67 cuda on a flat bed but it was working a lot harder going up mountain passes. As a matter of fact the little motor truck only got one MPG less loaded than the V8 did un loaded.

As for the converter you can get one made with the small hub and regular 904 guts. You could also swap cranks.

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I guess the argument goes back to the AGE OLD comparision of balance between HORSEPOWER vs. TORQUE. Throw into the mix: BSFC, Vehicle weight,
gearing, tire/front end science, C of G, and so on
and so forth, and you have ENDLESS possibilities on the mileage/power factor. YOU BOTH are RIGHT in your RESPECTIVE ways, since there are no CONCRETE standards to base the "theories" on. Everything Detroit builds is based on a COMPRIMISE, and IF you guys still are at odds, settle this at the TRACK. AT least there you can have a laugh or two, as well as BRAGGING RIGHTS!!
A MERRY CHRISTMAS and HAPPY NEW YEAR to all!! And God Bless us, every one!!

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Unless it is a 318 magnum the 273 "if it is the 4bbl version should be very clost to the horse/torque power of 318 heck even the 2bbl version would be close enough to the 72 and after 318 you won't see and big difference just drive and enjoy. The guy before me put a 273 4bbl in my challenger and it drove fine and plenty of power to move on a side note it was no 1/4 street fighter but niether is a 318

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Mabey he has a bad 318 in his truck and happens to have a good 273 sitting around. Mabey he just wants better MPG and don't mind the performance hit, it could be lots of reasons.

He will get better miledge and it will take longer to get an equal sized load going. My 239 in my dakota gets way better miledge than my 318 dakota even towing a 67 cuda on a flat bed but it was working a lot harder going up mountain passes. As a matter of fact the little motor truck only got one MPG less loaded than the V8 did un loaded.

As for the converter you can get one made with the small hub and regular 904 guts. You could also swap cranks.

---

I guess the argument goes back to the AGE OLD comparision of balance between HORSEPOWER vs. TORQUE. Throw into the mix: BSFC, Vehicle weight,
gearing, tire/front end science, C of G, and so on
and so forth, and you have ENDLESS possibilities on the mileage/power factor. YOU BOTH are RIGHT in your RESPECTIVE ways, since there are no CONCRETE standards to base the "theories" on. Everything Detroit builds is based on a COMPRIMISE, and IF you guys still are at odds, settle this at the TRACK. AT least there you can have a laugh or two, as well as BRAGGING RIGHTS!!
A MERRY CHRISTMAS and HAPPY NEW YEAR to all!! And God Bless us, every one!!

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Unless it is a 318 magnum the 273 "if it is the 4bbl version should be very clost to the horse/torque power of 318 heck even the 2bbl version would be close enough to the 72 and after 318 you won't see and big difference just drive and enjoy. The guy before me put a 273 4bbl in my challenger and it drove fine and plenty of power to move on a side note it was no 1/4 street fighter but niether is a 318

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, but why put the smaller motor in a HEAVY chassis car for the 1/4 mi jaunts anyway!!
It makes better sense to run the LIGHTEST chassis
as per rules in class or bracket racing. Anything goes for street usage, if it moves it, it's good.
Heck they HAD slant sixes in trucks for years and really no one has complained. If they did, a larger motor swapped in cured the problem. The 318 is nothing to sneeze at for racing, it just lacks in the breathing dept. on the top end scale!