Question about headers for a 1965 Belvedere 273 engine.

[Mickey]

Basically, I'm wondering if I have a poly motor. I'm looking for headers available for a 1965 Plymouth Belvedere with a 273. I've heard poly heads are different compared to the LA heads and headers. I bought a pair TTI headers for my 1975 Dodge Dart Swinger which has a 1970's 360 engine, and I'd like a pair of TTI's for my Belvedere. Any and all info and feedback is welcome.

 

[WileE]

273 is not a poly engine, it is an LA engine.

 

[Mickey]

273 is not a poly engine, it is an LA engine.

Excellent. Thanks for the reply. I'll look into new headers next spring!

 

[Blackheart]

I'm confused, do you have a 273 or Poly 318?? Easy to see the difference....headers for that 273 are plentiful, however if you have a Poly (I have 4) you have one option TTI and they are different for the B and C bodies, obviously you have a B. I learned that lesson by purchasing a used set, having them ceramic coated at Jet Hot and spending a day trying to fit them on my 63 Fury only to learn I had bought C body TTI headers and they were never going to work. They are now on a buddy's 65 Fury.

 

[toolmanmike]

Basically, I'm wondering if I have a poly motor. I'm looking for headers available for a 1965 Plymouth Belvedere with a 273. I've heard poly heads are different compared to the LA heads and headers. I bought a pair TTI headers for my 1975 Dodge Dart Swinger which has a 1970's 360 engine, and I'd like a pair of TTI's for my Belvedere. Any and all info and feedback is welcome.

You could have either engine in 65. Post up a photo or two of what you have. Especially the valve covers. Like the fellows above mentioned, Poly's and a LA 273 are different basically from the heads up and headers will not interchange. Here's a picture of my Poly. They have a scallop shape on the bottom edge of the valve cover.

 

[33 IMP]

Yep. If the lower edge of your valve cover is straight... LA
If the lower edge looks like saw teeth....poly.

And if the distributor is in the front? You're confused.

 

[33 IMP]

TM Mike, @toolmanmike LOVE the valve cover decal! Who made it?

 

[toolmanmike]

TM Mike, @toolmanmike LOVE the valve cover decal! Who made it?

It was on them when I got the car. I believe the stickers are available on E bay.

 

[toolmanmike]

TM Mike, @toolmanmike LOVE the valve cover decal! Who made it?

https://www.ebay.com/itm/3940185549...6e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c