How much HP can you get out of a 428 engine?
After some break-in miles, we’d likely see 375 hp and, with headers, yes, very likely 400 ponies. The peak torque of 452.4-lb-ft at 3,700 rpm is also higher than Dearborn’s claim of 445 lb-ft at 3,400….Testing 4-2-8… How Much Horsepower Does the Ford 428 Cobra Jet Really Make?
| RPM | Torque (lb-ft) | HP |
|---|---|---|
| 5,000 | 376.5 | 358.9 |
How much horsepower does a 1969 428 Cobra Jet have?
Engine Basics
| Year | 1969 “Q” Code (Cobra Jet) |
|---|---|
| Power (hp) | 335 hp @ 5,400 RPM |
| Torque (lb/ft) | 440 hp @ 3,400 RPM |
| Compression | 10.6:1 |
| Displacement | 428 cu / 7.0 liters |
Is the 428 Cobra Jet a good engine?
The Cobra Jet engine that was introduced in April 1968 is easily one of the most well-known engines of the late 1960s and early 1970s from the muscle car era. It is also one of the hardest to detail because, unlike a Boss or a Hi-Po engine, it was used in so many different applications and over several years.
What is the difference between 428 CJ and 428 SCJ?
The CJ block differs from the plain 428 due to the additional webs cast into the main bearing saddles. The SCJ block is the same as a CJ. The differences for the SCJ were: 1) The beefer 427 “LeMans” connecting rods.
How can you tell a Cobra Jet 429?
If you see a “4U” or “4UA” marking, you’ve found a 429 crank with 3.590-inch stroke. If you see “2Y” or “3Y,” you’ve found a 460 crank with a 3.850-inch stroke. A 429 Cobra Jet or Super Cobra Jet crank will have a Brinell hardness-tested dimple mark in the first counterweight.
Was there a Boss 428?
The Boss 429 Mustangs came with the most unique of Mustang engines….
| Mustang Big-Block Production* | |
|---|---|
| ’67 390 | 29,457 |
| ’69 428 Cobra Jet, R-code | **12,212 |
| ’69 Boss 429 | 849 |
| ’70 428 Cobra Jet, Q-code | ***800 |
How much HP does a Boss 429 have?
375 HP
The Boss 429 engine used a single Holley four-barrel carburetor rated at 735 CFM mounted on an aluminum intake manifold. All these cars had 4-Speed Manual Transmissions and the Boss was rated very conservatively at 375 HP while actual output was believed to be well over 500 horsepower.
How do you identify a Cobra 428 jet head?
The casting number, C8OE-6090-N, can be found in the recessed area between the middle two spark plugs as shown in the picture below. If the casting number is questionable, check the number of bolt holes on the exhaust manifold face for additional identification assistance (428 CJ heads should have sixteen bolt holes).