Re: Packard 6 engine?

Posted by Ross On 2015/3/28 19:35:17

All these flatheads, no matter the number of cylinders, benefit from some nice port and manifold cleaning with a die grinder. I am not a fan of a lot of relieving work as it ends up dropping the compression, but do like to round off the the edge of the pocket that is formed by Packard's use of inclined valves.

Don't be in a big rush to get a lot of compression by milling. What you will get is lot of harshness and diminished volumetric efficiency as you reduce the flow that goes over the tops of the valves.

Lately I have been giving a lot of care to smoothing the combustion chamber in the head--not removing much in the way of material but just removing the casting roughness. My thought is that this reduces the surface area. The more heat that stays in the chamber is there to help push the piston down and not being rejected to the radiator. Not to mention the diminished chance of preignition. My newly built 288 for my 54 runs cool as a cucumber.

You will find that your Clipper is not all that slow and will be light on its feet in a way that Super Clipper owners could only dream of. The smoothness and flexibility of that engine is quite pleasing and is not something you will want to compromise to get to 60mph 2 seconds faster.

I have a 50 Stude Commander with the 245 and overdrive. We are talking very similar weight and power. It is never embarrassed in normal traffic and has to be watched to stay under 75 on the 4 lane. With overdrive, your Clipper will do the same.