273 Modification

[walter novitski]

I recently purchased a 66 Dodge Dart GT with a rebuilt 273. It originally had a 2bbl carb but someone had replaced it with a Edelbrock 4bbl. What changes would i need to convert to the high performance 273 offered for that year?

 

[DesertRat]

Source yourself a service manual for the year of the car for starters. You will need to change the pistons and cam for starters if they haven't already been changed.

 

[AJ/FormS]

A different engine?
Ok no, just; the pistons, camKit, intake, carb, distributor, and exhaust, all of which are NLS ,no longer sold.
Some similar items can still be found

 

[JBurch]

Pistons, cam and intake; the 253HP 273 used 10.5 compression pistons, the cam had more lift and duration, would also require different springs, the intake was cast iron single plane, just use the intake you have now

 

[toolmanmike]

And a dual point distributor as well. The chrome air cleaner and wrinkle finish valve covers are Charger/Commando specific and for looks only but correct for those engines.

 

[AJ/FormS]

I forgot about dress-ups.

 

[JBurch]

I forgot about dress-ups.

Me too.........

 

[65Val]

Pistons, cam and intake; the 253HP 273 used 10.5 compression pistons, the cam had more lift and duration, would also require different springs, the intake was cast iron single plane, just use the intake you have now

Actually, the HiPo 273 was 235hp, not 253....

 

[Max1196]

When was the change-over for the intake manifold bolt angle? I see there's an edelbrock intake being used, did the heads get swapped out too, or is there an early ede' available for the early design?

 

[JBurch]

Actually, the HiPo 273 was 235hp, not 253....

I failed typing class

 

[toolmanmike]

When was the change-over for the intake manifold bolt angle? I see there's an edelbrock intake being used, did the heads get swapped out too, or is there an early ede' available for the early design?

64 and 65 were the first and odd years. . It changed in 1966.

 

[JBurch]

When was the change-over for the intake manifold bolt angle? I see there's an edelbrock intake being used, did the heads get swapped out too, or is there an early ede' available for the early design?

The change occurred between the 65 and 66 model year.........65 is odd angle, 5/16 bolt, 66 is same as all other LA engines and 3/8 bolt

 

[pishta]

Exhaust mani's were the same too. Did the dress up package also include a chrome alternator bracket and oil cap?

 

[toolmanmike]

exhaust was the same.

The manifolds were the same between years and 2 barrel and 4 barrel and the HP single exhaust came out in 1965

 

[pishta]

The manifolds were the same between years and 2 barrel and 4 barrel and the HP single exhaust came out in 1965

I clarified that to manifolds. I got a set on the wall.

 

[toolmanmike]

Exhaust mani's were the same too. Did the dress up package also include a chrome alternator bracket and oil cap?

No alt bracket. Chrome Hemi oil fill cap and chrome pcv cap.

 

[toolmanmike]

Individual wire holders on the 65 and 66. 2 cylinder combination looms on the 67

 

[65Val]

No alt bracket. Chrome Hemi oil fill cap and chrome pcv cap.

"chrome pcv cap"...on '65 and '66 covers only...'67 had the rubber PCV grommet

 

[toolmanmike]

"chrome pcv cap"...on '65 and '66 covers only...'67 had the rubber PCV grommet

Correct. I should have wrote a book instead of just a short story.

 

[Jadaharabi]

Was the standard 273 a hydraulic or solid cam?

 

[toolmanmike]

Was the standard 273 a hydraulic or solid cam?

solid

 

[65Val]

solid

64 to 67, both 2bbl and 4bbl solid...'68 & '69 hydraulic, 2bbl only, no 4bbl available.

 

[RustyRatRod]

Since it's not original, I would yank the little motor and put something bigger in it.

 

[Jadaharabi]

Since it's not original, I would yank the little motor and put something bigger in it.

.
This that Elvira?

 

[RustyRatRod]

.
This that Elvira?

Yup.