Horsepower of original 427

[Ron61]

I had a 64 Galaxie 500-XL with the dual four 427 and it was rated at the 425 horse given above, but the small tires they came with made it impossible to really get on it until you were above 60 MPH. But I don't believe it had as much power as they claimed. My 69 NASCAR Cobra with the 428 Cobra engine which was rated at 335 horse I had dynoed and it came out at 440 horse using the original exhaust manifolds which were the same as the 64 427 had as it has 427 heads and the bottom end is LeMans rods and stuff.

Ron

[DanEC]

Originally Posted by Ron61

I had a 64 Galaxie 500-XL with the dual four 427 and it was rated at the 425 horse given above, but the small tires they came with made it impossible to really get on it until you were above 60 MPH. But I don't believe it had as much power as they claimed. My 69 NASCAR Cobra with the 428 Cobra engine which was rated at 335 horse I had dynoed and it came out at 440 horse using the original exhaust manifolds which were the same as the 64 427 had as it has 427 heads and the bottom end is LeMans rods and stuff.

Ron

When I picked up my motor from Keith Craft's shop he had a couple 428 CJ restoration (stock) motors sitting near the dyno room after testing. I asked the dyno operator what they ran and he quoted getting around 430 to 440 HP I believe from memory.

[blykins]

I've done a couple of "period correct" engines, both street and race.

I built a 428CJ for a guy in Mississippi. It had the correct CJ heads, we just did a good valve job and put some Ferrea valves in them. Used a 227/233 @ .050" hydraulic roller cam, about .600" lift. Intake was the 75 lb cast iron CJ piece with no porting whatsoever. Compression was 9.7:1. It made 422 hp and around 460 lb-ft if I remember correctly.

Also did a 427 LR 2x4 for an FIA road race Galaxie. It was a rules engine, but we used the factory heads (did some heavy work on them), the factory 2x4 LR intake, and a solid flat tappet camshaft. It was an 11:1 engine. It made 510 hp @ 6000 through 6500 and 511 lb-ft of torque. That particular engine had a $ crank, with the rod journals turned to 2.200", Oliver 6.800" rods, and RaceTec pistons running .043/.043/3mm ring sizes.