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I'm thinking that the 277 is just an early small displacement 318 (poly that is). Does it have the same scalloped valve covers as the 318s up to 67? The initial design of the 318s was rear sump with the oil pump in the pan under the dist. so it would probably use the truck pan on a B or RB engine.
Bryce


Yes 277 is a poly motor. Anybody need one?



Just saying it's a poly isn't quite enough to identify it. Dodge and Chrysler poly engines of the fifties were were completely different engines than the Plymouth poly introduced in the 1956 model year.

But yeah, the 1956 Plymouth 277 poly is a small bore, short stroke version of the 318 poly. Other variations of the Plymouth poly were 301, 303, 313, and 326.

Plymouth poly's were used exclusively in Plymouths (at least in the US, and in cars) until 1959, when Dodge got a one-year-only 326 version. From 1960 on, the 318 poly was just the corporate small V-8 until it was superseded by the LA wedge small V-8's.