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Blueprinting Fixtures

Line Boring Fixture
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BHJ Line Boring Fixture

Part Nos: LBF, LBF1
LBF-1-CB: For Cam Tunnels boring, Block Specific
LBF-1-MB: For Main Bearing boring, Universal
LBF-CTSU: Step-Up Kit, Cam Tunnels, Block Specific
LBF-SU-CB: Step-Up Kit, Expand existing Mains Kit to Cam setup
LBF-SU-MB: Step-Up Kit, Expand existing Cam Kit to Mains setup

Click to view BHJ Line Boring Fixture how-to video.

Line boring main bearing or cam bearing bores can be performed with the LBF-1 Line Boring Fixture. Whether roughing in steel main caps or boring for installation of roller cam bearings, the heavy construction of the LBF-1 will provide the precise, accurate results that are demanded by today's high performance race engine builders.

When line boring cam tunnels for oversize babbit or roller bearings, the LBF-1 is the only line boring system on the market that will correct the cam tunnel location in all three planes making the cam tunnel: ABSOLUTELY PARALLEL TO THE MAINS, AT THE CORRECT CENTER-TO-CENTER DISTANCE TO THE MAINS, ON THE CORRECT FRONT-TO-REAR PLANE THROUGH THE BLOCK IN RELATION TO THE MAINS CORRECTING ANY SKEW OR TWIST. View the how-to video below.

Boring Main Bearings


The function of machining the cam tunnel parallel to and at the correct center-to-center distance from the mains is built into the fixture, while the ability to index the block into place with the mains being the reference point is left to the discretion of the operator. This method of set-up gives the operator the ability to position the block in the fixture for the best possible clean up based on existing cam tunnel location thus compensating for core shift and inaccurate factory machining. The amount of material to be removed from the deck surfaces will be minimized when the cam tunnel is located in this manner.

BHJ Line Boring Fixture

The large diameter boring bar supplied is supported by the fixture close to the block faces reducing the flex normally experienced with smaller diameter boring bars on conventional line boring machines to a minimum. This allows a greater cutting depth and reduces machining time while increasing accuracy and surface finish quality. The LBF-1 enables the machinist to bore to the finished desired diameter thus eliminating the line honing operation.

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