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Six-Cylinder Performance Guide

173 0312 Six 6 Z
At first glance, Ford light-duty six heads all look the same. This is a'60 144ci cylinder-head casting--a C0OE. Casting numbers and dates areimportant for identification. The earlier heads have smaller valves andchambers. Valve and chamber size increased with increasing displacement.
173 0312 Six 7A Z
(above & below) One performance handicap is the Siamese center exhaust port forcylinders 3 and 4. Jack Clifford's Performance Products has a quick,weld-in answer called an exhaust port divider, which stops theturbulence between the two ports to improve flow. Weld it in, then dosome port-grinding work for even smoother flow.
173 0312 Six 7B Z
173 0312 Six 8A Z
(above & below) Long ago, you could buy an Offenhauser three-one-barrel setup for your144/170/200ci six. It consisted of a bolt-on, finned-aluminum manifoldsetup designed to accommodate three Holley or Autolite one-barrelcarburetors. You had to bore two openings into the integral ironmanifold for the two additional carburetors. Then, the Offenhauseraluminum manifold bolted onto the iron manifold.
173 0312 Six 8B Z
173 0312 Six 9 Z
Today, you can buy a new Offenhauser three-one-barrel intake manifoldfor 144, 170, and 200ci sixes. Like the three-one setup just mentioned,this is a bolt-on, finned-aluminum manifold plate designed for threeone-barrel Holley or Autolite carburetors. All you need to do is borethe iron intake manifold for the two additional carburetors.
173 0312 Six 10 Z
When you're shopping cylinder heads, always consider piston deck heightand head-gasket thickness with the head torqued. The thinner your headgasket, the greater the compression because of the reduced chamber size.A thicker head gasket increases chamber volume, which reducescompression.

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