1973 340 Cam advice

trigger_andy said

Hey,

On the back there is 235/60/15"s

It has 2.92:1 gears at the back which may or may not go to 3.23:1 if that would make a difference?

The 4 speed is not the early and sought after close ratio boxes but a later more open ratio box that was mated to 318's in Australia. I've been advised that I should keep the 2.92:1 in the diff.

I'm really after a bit of fun. I don't do more than 500 miles a year and don't care about motorway RPMs and just wanna mess around in the roads.

Hope that helps?

Thanks,

Andy

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If you want to keep the highway gears, I would upgrade the cam to 276 - 284 max duration with a set of Rhoades lifters to tame it out... It will still have some low end and mid range grunt to get off the line, without sacrificing top end....

Rhoads Lifters

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The action plus intake is a spread bore intake, so a spread bore holley or carter thermoquad would bolt directly on - go with whichever you are more comfortable with... Both have their following... I've run the Holley List # 6711 spread bore carb for a good spread bore... It doesn't come with electric choke, so you have to use a stock style spread bore thermostat choke which aren't as accurate....

Changing to a 3.23 will help acceleration and still have good highway manners, but will drop top end and MPG...