Crankshaft snout drilling fixture tool 235 261 283 327 194 230 250 348 409
Use this tool to help drill the snout of cranks on 194 230 250 engines. Also works on SBC 283 327 350 as well for 235 261 and 348, 409. All of these cranks use the same diameter snout.
When buying this tool a USA made Cobalt drill and USA tap can also be included. The choices can be selected at bottom of this page.
The cranks are not drilled from the factory and adding the 7/16 bolt hole will aid you on installation of the balancer and retention of it.
Precision made to fit on the end of the crank. The fillings drop out the side while drilling. A drill bushing is used for perfect alignment of the drill during drilling.
This procedure can be performed on a assembled engine. The tool will fit on the snout. Be sure to plug the seal hole with a rag and direct the slot to the down position for chip discharge.
Drill 1.75 deep. We get many questions on which bolt to use. All applications are different. The bolt will be 7/16-20 and will need a THICK washer. Many times the bolts/washer are available in the help section at your local auto store.
Best to drill when crank is out of engine. I bolt the flange side to the flywheel/ flexplate to make it safely stand on end for drilling with hand drill.
Use a "W" drill bit and 7/16-20 tap
A "W" drill bit is .386 diameter, another commonly used drill for 7/16-20 is a 25/64 which is .390 (keep in mind the W drill bit provides a 70% thread engagement , the 25/64 does not). The 25/64 drill will not fit in this tool.