MR4V said

2 Darts said

G'day & Welcome to FABO

Tell about how to build a throttle/kickdown linkage bracket for a /6 Aussiespeed Hurricane and I'll tell you what I know about the '73 318. (lol) I'll start.

What Aussie auto 6 speed? Never heard of a Hurricane.

To get the compresion up can I use earlier LA 318/360 heads?

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LOL! Photo is the, made in Australia, Hurricane intake manifold. I'm working on a throttle/kickdown linkage mount so I can put it in my 73 slant six Dart.

The 67 LA 318 (64-67 273) heads and the 302 heads have the smallest chambers for best compression. The 360 heads won't help you gain compression, but with bigger valves will flow better. Mopar started putting hardened valve seats in heads in the LA V-8 after 1972 models for use with unleaded fuel.

For better compression on the piston side, use the 67-70 318 piston. It comes closest to the deck for 318 flat tops. FWIW, I have a 68 318 in the Demon with 302 heads. Other than a little port clean up on the heads, they are stock. The garage I use measured the compression ratio at 9.3:1.

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