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Well that's the thing, my Viper has 500 stamped on the dropouts, but it was originally sold as a Viper (it had Viper stickers)...so mine was probably a left-over Pacer 500 frame that Diamondback stickered and sold as a Viper (apparently the Pacer 500 sold badly, so they sold the remaining stock as Vipers).
If you go on the BMX Museum website in the reference section there is a catalogue for the Diamondback complete range for 1984 (mine is an 84 so i have used this A LOT for reference). The Pacer specs are on there. There's also a lot of Vipers / Pacers on the site. I have attached an image of a complete Pacer 500 from the museum, note the chainring. I am not sure of the crank used in the Pacer, the specs don't say exactly but if yours has JMI165 stamped on it, i know this was definately used on Vipers.
It would be stamped on the part that's inside the bottom bracket shell like this one