What are the dowel pin locations on the Small Block Ford bellhousing pattern?

The drawing shows the left dowel pin at 7.7400" horizontally from the crankshaft bore centerline and the right dowel pin at 7.2200" horizontally, with vertical dimensions of 3.8800"/2.9000" (left) and 4.2500"/2.9000" (right) shown in the same area.

What reference point are the bellhousing dimensions measured from?

All dimensions are referenced from the crankshaft bore centerline, which is labeled and marked with a red circle in the drawing.

How does starter location differ between 157-tooth and 164-tooth flywheels?

The drawing shows two starter locations: white dimensions (8.5255", 6.7423", 5.9154") apply to a 157-tooth flywheel, while green dimensions (9.0155", 7.2323", 6.4054", 4.4678", 1.9365", 0.0412") apply to a 164-tooth flywheel.

Where are the top bellhousing bolt holes located?

The two top bolt holes are each 2.5500" horizontally from the crankshaft bore centerline and 8.4300" vertically per the side dimensions.

What orientation is the drawing shown in?

It is labeled 'View Looking Forward,' i.e., viewing the rear of the block/bellhousing face looking toward the front of the engine.

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Small Block Ford Rear Bellhousing Bolt Pattern Blueprint - 157 & 164 Tooth

CAD dimensioned drawing comparing 157 and 164 tooth flywheel layouts, view looking forward

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Small Block Ford Rear Bellhousing Bolt Pattern Blueprint - 157 & 164 Tooth

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CAD drawing, view looking forward, of bolt and dowel pin hole locations from crankshaft bore centerline

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Dimensioned CAD blueprint of crankshaft and dowel-pin locations comparing 157-tooth and 164-tooth flywheel positions, view looking forward.

Part of 1979-1993 Ford Mustang Blueprints

AI caption December 2010 · Photo 125 of 132

This document is a CAD-style blueprint/dimensional drawing of the rear bellhousing bolt pattern for a Small Block Ford engine, shown in a 'View Looking Forward' orientation. All dimensions are referenced from the crankshaft bore centerline, which is highlighted with a red circle. The drawing locates each bellhousing bolt hole with horizontal and vertical dimensions (e.g., top bolts at 2.5500" either side of centerline and 8.4300" up; lower bolts at 8.2600" and 7.7500" out), and identifies the two dowel pin locations at 7.7400" (left) and 7.2200" (right) horizontally. The drawing also overlays the starter/starter-nose opening location for two different flywheel sizes: dimensions in white apply to a 157-tooth flywheel (e.g., 8.5255", 6.7423", 5.9154") and dimensions in green apply to a 164-tooth flywheel (e.g., 9.0155", 7.2323", 6.4054", 4.4678", 1.9365", 0.0412"). A reader can use this diagram to lay out or verify a Small Block Ford bellhousing bolt pattern, locate dowel pins, and determine starter placement differences between 157- and 164-tooth flywheel applications. The document itself gives no year, part numbers, or model applicability text.

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Frequently asked questions

What are the dowel pin locations on the Small Block Ford bellhousing pattern?: The drawing shows the left dowel pin at 7.7400" horizontally from the crankshaft bore centerline and the right dowel pin at 7.2200" horizontally, with vertical dimensions of 3.8800"/2.9000" (left) and 4.2500"/2.9000" (right) shown in the same area.
What reference point are the bellhousing dimensions measured from?: All dimensions are referenced from the crankshaft bore centerline, which is labeled and marked with a red circle in the drawing.
How does starter location differ between 157-tooth and 164-tooth flywheels?: The drawing shows two starter locations: white dimensions (8.5255", 6.7423", 5.9154") apply to a 157-tooth flywheel, while green dimensions (9.0155", 7.2323", 6.4054", 4.4678", 1.9365", 0.0412") apply to a 164-tooth flywheel.
Where are the top bellhousing bolt holes located?: The two top bolt holes are each 2.5500" horizontally from the crankshaft bore centerline and 8.4300" vertically per the side dimensions.
What orientation is the drawing shown in?: It is labeled 'View Looking Forward,' i.e., viewing the rear of the block/bellhousing face looking toward the front of the engine.