What is the overall bolt hole span of the valve cover pattern?

The longest dimension shown is 18.8420" between the outermost bottom-row bolt holes, measured from hole #1.

What is the vertical distance between the top and bottom rows of bolt holes?

The drawing shows 5.2500" between the top and bottom bolt hole rows.

What are the bolt hole spacings along the top edge?

Top-row holes are located at 2.0460", 9.4210", and 16.7960" from the left reference point.

What corner radii are specified on the valve cover pattern?

Callouts show R 1.7500", R 1.2500" (in two places), R 2.0652", R 0.3000", and R 0.4625".

How many bolt holes does the pattern show?

The drawing shows six or seven small holes: three dimensioned along the top edge and holes along the bottom edge dimensioned from a hole labeled #1.

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Ford Small Block Valve Cover Bolt Pattern Blueprint - Dimensions & Radii

CAD dimensioned drawing of a valve cover bolt pattern with radii and spacings

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Dimensioned CAD blueprint of a valve-cover pattern showing bolt-hole spacing, radii, and overall measurements.

AI caption August 2010 · Photo 145 of 156

This document is a CAD-style blueprint titled "Valve Cover Pattern," showing the bolt hole layout and outline geometry for a valve cover gasket surface. The drawing depicts an elongated rounded-rectangle pattern with six bolt holes (three along the top edge, three along the bottom edge, plus a reference hole marked #1 at the bottom-left). Horizontal dimensions locate the top-row holes at 2.0460", 9.4210", and 16.7960" from the left reference, and the bottom-row holes at 6.2650", 12.5770", and 18.8420" from hole #1. The vertical distance between the two bolt rows is 5.2500", with a 0.1560" offset dimension at the bottom-left. Corner and profile radii are called out as R 1.7500", R 1.2500" (two locations), R 2.0652", R 0.3000", and R 0.4625". A fabricator or machinist could use these dimensions to lay out a valve cover, gasket, or flange matching this pattern. The document itself contains no year, make, model, or part number information; it was uploaded to a 1990 Ford Mustang gallery alongside other small-block Ford engine pattern drawings.

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Frequently asked questions

What is the overall bolt hole span of the valve cover pattern?: The longest dimension shown is 18.8420" between the outermost bottom-row bolt holes, measured from hole #1.
What is the vertical distance between the top and bottom rows of bolt holes?: The drawing shows 5.2500" between the top and bottom bolt hole rows.
What are the bolt hole spacings along the top edge?: Top-row holes are located at 2.0460", 9.4210", and 16.7960" from the left reference point.
What corner radii are specified on the valve cover pattern?: Callouts show R 1.7500", R 1.2500" (in two places), R 2.0652", R 0.3000", and R 0.4625".
How many bolt holes does the pattern show?: The drawing shows six or seven small holes: three dimensioned along the top edge and holes along the bottom edge dimensioned from a hole labeled #1.