rocker arm ratios?

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Badvert65

Post subject: rocker arm ratios?

PostPosted: Tue Feb 19, 2019 5:56 pm

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Turbo EFI

Joined: Mon Jan 12, 2015 5:55 am
Posts: 1437
Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I

I have heard that the factory mechanical rocker arms are notorious for not actually being a true 1.5 ratio. What is the best method to check for checking the ratios of these rocker arms?

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DadTruck

Post subject: Re: rocker arm ratios

PostPosted: Tue Feb 19, 2019 6:19 pm

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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3853
Location: Indianapolis
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The rocker ratio is the proportional distance of the push rod side of the rocker to the valve side of the rocker with the rocker shaft as the centerline.

A garage bench method to chech the rocker ratio is to mount a rocker on a shaft, have a dial gauge zeroed on the valve side, preferably at the valve contact point, then move the push rod side a known distance. The valve side should have moved 1.5 times what the push rod side moved.

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