What are the Ford part numbers for the tunnel port heads and dual quad manifold?

The heads carry part number GFJK-6049-E and the dual quad manifold is SFJK-9424-K, available from Ford dealers or Carroll Shelby's parts outlets.

What engines can the tunnel port bolt-on parts be used on?

Most of the bolt-on parts can be used on all motors in the 260-289-302 family.

What valve sizes do the tunnel port heads have?

The special tunnel port heads have 2.15-inch intakes and 1.56-inch exhausts.

What did the review say about the 1968 Shelby GT500's handling?

Roll resistance was exceptionally good, the test car was predictable on the road course, and the tail could be sent out at will to aid cornering control; the reviewers couldn't find any faults with its road manners.

How much did the Offenhauser 360° Equa=Flow manifold cost in 1968?

The model shown, for the 289 Ford, was available from $92.50 list price, ready and shipping for all popular V-8 engines.

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1968 Shelby GT500 & Ford 427 Tunnel Port Article - Speed & Supercar p.67

Ford 289 tunnel-port head and dual-quad manifold part numbers (Shelby hop-up article)

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Magazine tech article on hopping up the Ford 260/289/302 small-block: tunnel-port heads, dual-quad Holley intake, with Ford/Shelby part numbers.

AI caption October 2009 · Photo 34 of 66

This is page 67 of Speed & Supercar magazine (1968), containing continuations of several feature articles plus a full advertisement. The first column concludes a Ford tunnel-port engine discussion, covering 12.5-to-1 pop-up pistons, solid-lifter camming, transistorized ignition, tunnel port heads with 2.15-inch intakes and 1.56-inch exhausts, and notes that bolt-on parts fit the 260-289-302 family. It gives Ford head part number GFJK-6049-E and dual quad manifold number SFJK-9424-K, available through Ford dealers or Carroll Shelby's parts outlets. The 'Spark Plugs' continuation explains Champion 'U' series gap plugs, resistor plugs for radio/TV interference suppression, and advises writing Champion Spark Plug Company (Toledo, Ohio) for Form A-617. The 'Shelby GT500 continued' section reviews the '68 GT500's road manners, roll resistance, inertia reel seat belts, roll bar, and compares fastback vs. convertible bodies, suggesting a tunnel port 427 for Super/Stock racing. The 'Chargers continued' section describes a Comet 202 with a four-barrel 427 wedge raced by John Elliot of Chatham, Ontario for A/SA class. The bottom half is a 1968 Offenhauser ad for the new 360° Equa=Flow intake manifold (model shown for 289 Ford, from $92.50), with the company's Los Angeles address and phone number.

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Frequently asked questions

What are the Ford part numbers for the tunnel port heads and dual quad manifold?: The heads carry part number GFJK-6049-E and the dual quad manifold is SFJK-9424-K, available from Ford dealers or Carroll Shelby's parts outlets.
What engines can the tunnel port bolt-on parts be used on?: Most of the bolt-on parts can be used on all motors in the 260-289-302 family.
What valve sizes do the tunnel port heads have?: The special tunnel port heads have 2.15-inch intakes and 1.56-inch exhausts.
What did the review say about the 1968 Shelby GT500's handling?: Roll resistance was exceptionally good, the test car was predictable on the road course, and the tail could be sent out at will to aid cornering control; the reviewers couldn't find any faults with its road manners.
How much did the Offenhauser 360° Equa=Flow manifold cost in 1968?: The model shown, for the 289 Ford, was available from $92.50 list price, ready and shipping for all popular V-8 engines.