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Tail Pipe Size

B-Body Bruce

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What is the correct size of the tailpipe for a 1965 Hemi Coronet? Also,can you drop the oil pan on a 65 Coronet 318 Poly without having to jack up the engine...thanks everybody...
 
Don't know about the tail pipe for the hemi, but I just dropped the pan on the Poly 318 in my `66 Belvedere II...without jacking the engine. I can't imagine there is much difference in the mechanicals between 65 & `66. Had to: remove the brackets that go block to transmission (on my Auto); disconnect the trans lines bracket on the drivers side; and disconnect the steering linkage...just popped it loose at the pitman arm and idler arm...leaving the ends attached to the tie rod ends. Just move it forward to get it out of the way. If you have stock exhaust, the 'Y' pipe may also have to be dropped, depending on where it crosses over. It wasn't as bad of a job I had thought it would be. Raising the whole car evenly (front and back) with jack stands makes things easier. Laying on large pieces of cardboard really softens the concrete! Good luck.
 
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Don't know about the tail pipe for the hemi, but I just dropped the pan on the Poly 318 in my `66 Belvedere II...without jacking the engine. I can't imagine there is much difference in the mechanicals between 65 & `66. Had to: remove the brackets that go block to transmission (on my Auto); disconnect the trans lines bracket on the drivers side; and disconnect the steering linkage...just popped it loose at the pitman arm and idler arm...leaving the ends attached to the tie rod ends. Just move it forward to get it out of the way. If you have stock exhaust, the 'Y' pipe will also have to be dropped. It wasn't as bad of a job I had thought it would be. Raising the whole car evenly (front and back) with jack stands makes things easier. Laying on large pieces of cardboard really softens the concrete! Good luck.
Thanks Dako, Being that it is 110 degrees outside,and over that in the garage..might wait till fall on that one...lol! Thanks
 
I edited my response. Depending on where the 'Y pipe' crosses over it MAY need to be removed. If it crosses over under the transmission, it won't need to be touched.

Understand waiting until the fall. I grew up 45 minutes south of death valley!
 
I would say the tail pipe size would be what ever you prefer. The reason I say that is most or all 65 Hemi cars were built with a single exh. It was done basically because they new the racers would just run open headers. But the rules back then stated the cars had to have a factory exh on them. So the racers could run open headers but the exh had to be on the car so the single exh was lighter and put less weight on the car. NHRA said the SS cars had to have a factory exh system to run but let them run open headers. Kind of a goofy rule but I know in 68 it was still in effect because the 68 Hemi Cida's and Dart's also had the exh on the cars in 1968 when racing in SuperStock. I know on my 63 with my 493 I run a straight 3" system and I race throught the pipes. Many exh experts say that it works good to make the tailpipe smaller as they say if you run 3" exh you can make the tailpipes 2.5"". It has to do with the exh gases cooling as they go through the pipes and dont need the tail pile as large as the rest of the exh. But I prefered to keep mine all the same size. Ron
 
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