1966 Mustang 289 HiP0
PRODUCTION STATISTICS:
1965 – 7,273 of the 680,989 Mustangs built
1966 – 5,469 of the 607,568 Mustangs built
1967 – 489 of the 472,121 Mustangs built 3 Year Total = 13,214 of the 1,760,678 Mustangs produced
TECHNICAL INFO:
The engine began life as a standard 289 Cubic Inch cast iron block. The crankshafts were tested for hardness and ones that met a standard were handpicked for the HI-PO engine, the ones that didn’t went into standard 289 engines. The rod bearings and bolts were upsized. The front of the crankshaft has a hatchet weight to balance out the weight of the larger rod bearings and bolts. The harmonic balancer was also enlarged for the same reason. Pistons were cast and the compression ratio is 10:5 to 1. The alternator pulley was also enlarged to reduce the number of revolutions at high engine RPMs. HI-PO engines also had a wide four blade, riveted cooling fan.
The cast iron heads were unique to the HI-PO engine, with chrome plated valve stems, solid valve lifters, screw in rocker studs, and cast in valve springs guides. The camshaft has special lobes for high-lift The exhaust manifolds were cast iron free flowing 'header type' and all HI-POs had a 2" exhaust system with a crossover design 'H' pipe to equalize pressure and dual exhaust with low restriction mufflers.
The intake manifold was a standard cast iron 289 4V, but the carburetor was a 600 CFM Autolite 4100 with a manual choke and chrome air cleaner. The distributor was a dual-point mechanical advance.
A factory engine dress up kit was standard and included chrome valve covers and air cleaner.
The transmission is a Ford design close-ratio 4 speed cast iron top loader with 10.4" clutch that was a mandatory option with the 271 HI-PO engine option in 64 1/2 and 1965. In late 1966 and in 1967 an automatic transmission was an available option. The rear axle is 9” in ratios of 3:50, 3:89, and 4:11.
A heavy duty suspension (front/rear springs & shocks) with a larger (13/16") front sway bar was included with the HI-PO engine option. Tires were 14" dual redlines standard with an option of black or whitewalls.
The steering was the fast ratio box (16 to 1) used with the power steering cars, but without the power assist. No power steering, power brakes, or air conditioning was available from the factory on the K-Code HI-PO.
These engines were capable of 7,000 RPM’s with a close ratio 4 speed, and a 3:89 rear axle, high 14 second 1/4 mile times were possible.
1965 – 7,273 of the 680,989 Mustangs built
1966 – 5,469 of the 607,568 Mustangs built
1967 – 489 of the 472,121 Mustangs built 3 Year Total = 13,214 of the 1,760,678 Mustangs produced
TECHNICAL INFO:
The engine began life as a standard 289 Cubic Inch cast iron block. The crankshafts were tested for hardness and ones that met a standard were handpicked for the HI-PO engine, the ones that didn’t went into standard 289 engines. The rod bearings and bolts were upsized. The front of the crankshaft has a hatchet weight to balance out the weight of the larger rod bearings and bolts. The harmonic balancer was also enlarged for the same reason. Pistons were cast and the compression ratio is 10:5 to 1. The alternator pulley was also enlarged to reduce the number of revolutions at high engine RPMs. HI-PO engines also had a wide four blade, riveted cooling fan.
The cast iron heads were unique to the HI-PO engine, with chrome plated valve stems, solid valve lifters, screw in rocker studs, and cast in valve springs guides. The camshaft has special lobes for high-lift The exhaust manifolds were cast iron free flowing 'header type' and all HI-POs had a 2" exhaust system with a crossover design 'H' pipe to equalize pressure and dual exhaust with low restriction mufflers.
The intake manifold was a standard cast iron 289 4V, but the carburetor was a 600 CFM Autolite 4100 with a manual choke and chrome air cleaner. The distributor was a dual-point mechanical advance.
A factory engine dress up kit was standard and included chrome valve covers and air cleaner.
The transmission is a Ford design close-ratio 4 speed cast iron top loader with 10.4" clutch that was a mandatory option with the 271 HI-PO engine option in 64 1/2 and 1965. In late 1966 and in 1967 an automatic transmission was an available option. The rear axle is 9” in ratios of 3:50, 3:89, and 4:11.
A heavy duty suspension (front/rear springs & shocks) with a larger (13/16") front sway bar was included with the HI-PO engine option. Tires were 14" dual redlines standard with an option of black or whitewalls.
The steering was the fast ratio box (16 to 1) used with the power steering cars, but without the power assist. No power steering, power brakes, or air conditioning was available from the factory on the K-Code HI-PO.
These engines were capable of 7,000 RPM’s with a close ratio 4 speed, and a 3:89 rear axle, high 14 second 1/4 mile times were possible.
As you can see there is no shortage of rust we determined this was a prime candidate for a full floor pan, and toe boards. Also required is two qtr panels, trunk floors, floor reinforcement rails, taillight panel, and cowl panels.
