Guys

Going back to buy another SL6 from a guy I bought from about a month ago. I'm buying what I saw was a complete red longblock with a glass sediment bowl style fuel pump.I know my slant sixes from the late 70's up & so I need a few bits of info. Like is it a 225, 190, or 178???

Serial numbers? Special markings on the casting?

Any input is appreciated!

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Slant six should have stayed in production.

Early would be a 225 or 170. The 198 wasn't built until the 70's and would most likely be blue unless somebody squirted it. How many freeze plugs? If it's got three, it's not a 198.
Look at the ID pad on the deck. The size will be stamped there.
Once you've seen a 170, you won't have any problem identifying one. The deck is considerably higher for the 225/198 RG engine than the 170" LG.

CJ

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Part of Tyrde-Browne Racing

170 deck is very close to (or at) 1.5" shorter than a 225. Crossover hose from water pump to head is a good way to gauge it. The 170 has a really short hose - about 2".

Lou

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Home of Slant6-powered fun machines since 1988

Hi Aluminum Six.
You may have use for the Slant Six Engine Parts Reference Matrix in this link to the article section. Print it out, and keep a copy in the car.

Another article worth browsing through before searching for an engine, is Doc's article Playing With Blocks.

Happy hunting!

Olaf.

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Aspenized