273 cam

Posted By: hemidere

273 cam - 03/30/13 02:50 AM

My chum has a 66 Barracuda with a 273. He wants to swap the factory solid cam for a mild hydraulic. Any issues?

Posted By: skicker

Re: 273 cam - 03/30/13 02:54 AM

273's were all solid lifter motors. If he wants to do a small hydraulic swap he will need push rods and a set of hydraulic rockers from a 318. I used a 284-484 Mopar Performance cam in one and it ran pretty good.

Posted By: RapidRobert

Re: 273 cam - 03/30/13 03:10 AM

May I ask what issue is he haveing with the solid cam?

Posted By: hemidere

Re: 273 cam - 03/30/13 03:37 AM

No issue, he wants a little more performance.

Posted By: Jim_Lusk

Re: 273 cam - 03/30/13 04:11 AM

Quote:

273's were all solid lifter motors. If he wants to do a small hydraulic swap he will need push rods and a set of hydraulic rockers from a 318. I used a 284-484 Mopar Performance cam in one and it ran pretty good.

Not the 68 and 69 273s, they were all hydraulic. You can run the adjustable rockers, but the stock pushrods won't be the correct length. The easy thing to do is swap to the non-adjustable rockers and corresponding pushrods.

Posted By: ahy

Re: 273 cam - 03/30/13 04:11 AM

If performance is the objective, a solid will generally be better. The solid can get the valves open a little faster and farther for any given duration. That means more performance with less trade-off in drivability and economy. How about a bigger solid with matching spings?

Posted By: hemidere

Re: 273 cam - 03/30/13 04:25 AM

He has a NOS 340 hyd cam a parts guy found while doing a clean out at one of the local Dodge dealers, left over from the 70's. If he can swap with the solid is what we need to know...

Posted By: RapidRobert

Re: 273 cam - 03/30/13 04:38 AM

As said need rockers/pushrods. I have some extras you can have for the shipping (I think I have 16 pushrods) & shafts too. That way you can keep the solid rocker/shaft assys together to keep or sell

Posted By: jcc

Re: 273 cam - 03/30/13 11:35 AM

Dropping in a 318 would be easier.

Posted By: 65rbdodge

Re: 273 cam - 03/30/13 02:01 PM

Quote:

Dropping in a 318 would be easier.

a motor swap is easier than a cam swap?

Posted By: rbstroker

Re: 273 cam - 03/30/13 02:12 PM

You're going to have to change pushrods, but you can keep the cast adjustable rocker arms. Smith Brothers can fix you up with pushrods or you can get them ready-made from Summit or Jeg's.

Posted By: Supercuda

Re: 273 cam - 03/30/13 02:13 PM

Quote:

Quote:

Dropping in a 318 would be easier.

a motor swap is easier than a cam swap?

It is if it isn't you doing it.

To the OP, all you really need to swap in a hydraulic cam is the cam, the hydraulic lifters and a set of new push rods for hydraulic cam to adjustable rockers.

Posted By: Anonymous

Re: 273 cam - 03/30/13 02:37 PM

The stock 273 cam is super mild, even the 4-barrel cam only had 248 degrees duration. If it's an otherwise stock 273, the factory 340 cam is plenty big and will be a big improvement in performance.

You friend can either swap in 318/340/360 pushrods and non-adjustable rocker arms, or keep his adjustable rockers and just buy some pushrods ready-made for a hydraulic cam and adjustable rockers (which would be my choice).

Other than the pushrod issue, putting a hydraulic cam in an early 273 is no more or less complicated than changing cams in anything else.

Posted By: Dodgem

Re: 273 cam - 03/30/13 06:56 PM

Mancini brand for hydralic cams and adjustable rockers
http://chucker54.stores.yahoo.net/enhypusech.html

comp cams ones that should work
http://www.summitracing.com/parts/cca-7821-16/overview/

Posted By: jcc

Re: 273 cam - 03/30/13 08:14 PM

Quote:

Quote:

Dropping in a 318 would be easier.

a motor swap is easier than a cam swap?

Well based on the replies so far, 45 cubes is hard to overcome with a simple cam swap.

Posted By: hemidere

Re: 273 cam - 03/30/13 11:46 PM

Thanks Rapid Robert, I'll see him tonight and advise...Ian

Posted By: cageman

Re: 273 cam - 03/31/13 01:32 AM

I'll put my 273 up against any 318. No way I would ever put a 318 in.

Posted By: scratchnfotraction

Re: 273 cam - 03/31/13 05:17 AM

Quote:

Quote:

Quote:

Dropping in a 318 would be easier.

a motor swap is easier than a cam swap?

Well based on the replies so far, 45 cubes is hard to overcome with a simple cam swap.

I used a 273 hipo solid cam with .500 lift,that thing rocked.

I have used the 273 hipo solid in a few 318s,all 273 valve gear.

if you are going hydro cam/lifters stick a 318 whiplash cam in it.

Posted By: hemidere

Re: 273 cam - 03/31/13 05:34 AM

Thanks all, met with Darcey tonight. He's goin with the 340 hyd cam, 273 rockers & new pushrods. Should motivate the little Cuda nicely...