What engine and power did the Ford GT MK IV J4 have?

The sign lists a Ford 427 cid engine producing 525 h.p., with a top speed of 225+ M.P.H.

What was the Ford GT MK IV chassis made of?

It was constructed of 1" and ½" aluminum honeycomb panels; the basic chassis weighed only 85 lbs, and the MK IV was the first car to use this material in its basic construction, saving nearly 300 lbs overall.

Why did Ford develop the MK IV instead of continuing with the MK II GT-40?

The placard states the MK II GT-40 was reaching the limits of its developmental capability because it was based on the original steel-chassied 225 c.i. MK I; weight, handling, aerodynamics, and Ford's resources led to an all-new car built entirely in the U.S.

Who owned the Ford GT MK IV J4 shown on this display?

The sign lists the owner as Larry Miller.

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Ford GT MK IV J4 - 1967 12 Hours of Sebring Winner Museum Display Sign

Museum display placard describing the Ford GT MK IV J4 Sebring winner

Printed museum display placard detailing the Ford GT MK IV J4, the 1967 12 Hours of Sebring winning Ford team car.

AI caption August 2007 · Photo 0 of 5000

This is a photograph of a yellow museum display placard describing the Ford GT MK IV, chassis J4, winner of the 1967 12 Hours of Sebring as a Ford team car. The sign lists key specifications: a Ford 427 cid engine producing 525 h.p. and a top speed of 225+ M.P.H., with the car owned by Larry Miller. A period photo on the placard shows the white #1 GT in the pits at a race. The descriptive text explains that Henry Ford's decision to defend Ford's 1966 successes at Daytona, Sebring and Le Mans drove development of an all-new car, since the MK II GT-40 (based on the steel-chassied 225 c.i. MK I) had reached its developmental limits. The MK IV was a technologically advanced endurance racer built entirely in the U.S., constructed of 1" and ½" aluminum honeycomb panels with a basic chassis weighing only 85 lbs — the first car to use this now-common material — achieving a weight saving of nearly 300 lbs. Other innovations included wheels designed to pump hot air out of the brake calipers. The final paragraph, noting J4 was the first MK IV built and its Sebring win, is cut off at the bottom of the photo.

This document covers 1966-1967, which may differ from this 1972 Ford Ranchero.

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Frequently asked questions

What race did the Ford GT MK IV chassis J4 win?: According to the placard, J4 was the winner of the 1967 12 Hours of Sebring as a Ford team car, and it was the first MK IV built.
What engine and power did the Ford GT MK IV J4 have?: The sign lists a Ford 427 cid engine producing 525 h.p., with a top speed of 225+ M.P.H.
What was the Ford GT MK IV chassis made of?: It was constructed of 1" and ½" aluminum honeycomb panels; the basic chassis weighed only 85 lbs, and the MK IV was the first car to use this material in its basic construction, saving nearly 300 lbs overall.
Why did Ford develop the MK IV instead of continuing with the MK II GT-40?: The placard states the MK II GT-40 was reaching the limits of its developmental capability because it was based on the original steel-chassied 225 c.i. MK I; weight, handling, aerodynamics, and Ford's resources led to an all-new car built entirely in the U.S.
Who owned the Ford GT MK IV J4 shown on this display?: The sign lists the owner as Larry Miller.