Yep. I run LPG in my 1955 chevy 1 ton witha 283. It starts up pretty good at 30 and even 40 below zero here in Montana. The 283 is at about 9.5:1 compression with the timing advanced about 10 degrees. The heads are power pack with hardened valves and seats. This is a dual fuel set up where I can run either gas or LPG but not at the same time. The manifold is Edelbrock Aluminum, exhaust= factory rams head and the carb is a simple Holley 4360 (425cfm I think). I like the performance of this set up and would like to repeat it with my 270 six, or at least keep it from being a dog or gas guzzler. My 283 gets about 11 mpg of unleaded with a bit more snap than the 10 mpg on lpg. But that's with a 4:56 rear end and a 6,000 lb truck with poor aerodynamics.
I'd post some pictures but haven't figured out how yet.
