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Original Message
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| NHRA Factored HP for 428CJ |
| By Royce Peterson - 12/09/2001 6:47:18 AM; IP 64.12.107.33 |
NHRA factors the 428CJ at 375 HP with flat top pistons and light valves. With factory dished pistons and heavy stock valves it is factored at 360 HP. Here's a link to NHRA's factor lists:
http://www.nhra.com/tech_specs/engine/
A lot of magazines have speculated that the 428CJ had nearly the same horsepower in stock form as the '68 427 and I would have to agree, since I own two of the 68 427's and a 68 1/2 428CJ. The 427 was rated at 390 HP on the "A" or gross horsepower curve. That curve has only a water pump being driven by the engine and uses race headers, no air cleaner, etc. The CJ rating was allegedly taken with all acessories, that means alternator and smog pump, plus exhaust manifolds and a factory air cleaner. The torque figures for both engines are easier to compare because both are from the "A" curve. The 1968 427 is listed at 460 LB-FT at 3200 RPM. The 68 1/2 428 CJ is listed at 440 LB-FT at 3400 RPM.
Royce Peterson |
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