273 4bbl dyno results

I was sure that, there is numbers of 273 lovers, like me. That's why I post my results.
Some added infos of my build. I try to keep my Barracuda as original as possible, only updates at the engine is Cam with hyd. lifters, headers and elect. ignition, new timing set and new oil pump.
All the rest, original build on the December 1966. ( 273, 4bbl).
Crank, connecting rods, pistons all original (bore 3,630" .010 cast piston rings didn't fit, those need to be fitted, heads only guide bushings, stronger valve springs added. Also original intake and 4294 S Carter cleaned and tuned. Off course all bearing surfaces has been checked and all what is needed has been changed, but basically it was quite easy rebuild.

I believe that I could have even better results, but cylinder bores were little conical on the top (about 1/2" down from deck level) , so I am loosing compressions. Don't know why those are like that, I mean so deep, just on the edge of the compression ring. Also heads gasket is oversized ( I ordered gasket set what match for 273,318 and 340cid) so I loose compression there as well. I don't know can I get anymore correct gaskets?

Bores are just wear. You can hone with torque plates and straighten and round them back again, but the bore gets bigger. Most people won't take the time and patience to go that route. Too big and you are into new pistons. Ahhhh, the early MOPAR rebuild. Rings, bearing, gaskets, timing chain, exhaust valves, and a valve job. Don't try that with a Chevy. More power, throw in a cam, lifters, and matching valve springs. I always run Fel-Pro gaskets, they never leak or blow out. Good job!