I built one for a friend last year, 438" with a 3.75" crank, 1969 383 block. The rotating assembly and heads were 440 Source. Very mild combo Hughes 228/232 @ .050" hydraulic cam, low deck Performer RPM intake, Holley 750 and small dyno headers. It made around 450 hp and 475 lb. ft of torque and even went to 6,000 rpm. Built to cruise and have good vacuum for power brakes. The dyno headers probably cost a few HP so he went with 1 7/8" TTi headers for when it goes in the car.

Not terribly expensive to build. We ran the cost both ways and turned to be only slightly more than a full rebuild with reconditioned, stock-stroke parts.


[video:youtube]https://youtube.com/shorts/Ckfj4bhwOh8?feature=share[/video]