identifying heads for 273

Hayzee said

Hi, just off topic but do you know what castings those 273 swirl ports are? i was always under the impression that swirl porting was a new technology in the 80's? any more information on this would be great as im trying to build a stock 2bbl 273 into something fairly hipo. cheers

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Since all the 273 heads have closed chambers, I'd assume Tim ment that all of them are an early version of swirl port design. Tim was going to port the heads on my first D/Dart but he never had time to do them. At the time, he was doing a lot of porting on Harley Davidson aluminum heads. He was making some big bucks doing that on the side. That was back in the late 90's.

Some of the 2658920 heads manufactured in 1966 had 1.87 intake and 1.50 exhausts valves.