BBC: Merlin or Dart Block?
Moderator: Team
-
- Guru
- Posts: 4653
- Joined: Thu Jul 01, 2004 6:34 am
- Location: NORTHEAST
- Contact:
We have machined both Dart and World blocks, We have the ability to probe the blocks in our CNC machine for deck heights, cylinder location and size and lifter bore placement and both seem to be very good in that area.
Website is up and running
http://hinksonautomotive-cncblocks.com/
Machine shop tour
http://hinksonautomotive-cncblocks.com/shop-tour/
Monthly Specials
http://hinksonautomotive-cncblocks.com/specials/
55MM babbit cam bearings with 1 hole
http://hinksonautomotive-cncblocks.com/
Machine shop tour
http://hinksonautomotive-cncblocks.com/shop-tour/
Monthly Specials
http://hinksonautomotive-cncblocks.com/specials/
55MM babbit cam bearings with 1 hole
Both blocks are nice pieces, certainly rigid for major horsepower.
-The World Merlin has lifter bores .0008 oversize, but seems to cause no problems, and the main housing bores are set on the high spec. Also a major concern is the casting sand/iron in the water jackets. Cylinders certainly will run hotter if not removed. A bent up screw driver or saw blade usually will break it up.
-The Dart Blocks are all good in quality control, but the lifter bores are .0005 tight, requiring honing and the main housing bores are on the low, usually requiring align honing. Perfect for custom engine builders, allowing the builder to determine clearances.
-The World Merlin has lifter bores .0008 oversize, but seems to cause no problems, and the main housing bores are set on the high spec. Also a major concern is the casting sand/iron in the water jackets. Cylinders certainly will run hotter if not removed. A bent up screw driver or saw blade usually will break it up.
-The Dart Blocks are all good in quality control, but the lifter bores are .0005 tight, requiring honing and the main housing bores are on the low, usually requiring align honing. Perfect for custom engine builders, allowing the builder to determine clearances.