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427 high-riser cam specs.

June 14 2002 at 12:20 PM
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Tyler Levy  (Login Tyler_Levy)
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Does anyone know what the duration at .050 tappet lift is on the 425hp 427 high riser cam. The medium riser to if anyone has the specs.

Thanks

 
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Royce Peterson
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205.188.209.105

Here Ya Go!

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June 14 2002, 2:41 PM 

As far as I know only the 427 Thunderbolts and 64 - 65 Mercury Comets received 427 Hi Risers and they were installed at Dearborn Steel Tubing under contract to Ford. I believe they would have used the same cam as other 8V 427's of the era but were probably changed by the racers as soon as the car came off the trailer at their shop. There might be some back door Galaxie lightweight that received one but as original factory equipment? No.

The 8V 425 HP 427's (Low Riser 63 1/2 - 65 and 65 - 67 Medium Riser) received the following cam:
P/N C3AZ 6250-AA
Duration Intake 306 degrees / Exhaust 306 degrees (seat to seat)
Lift .298" at lobe
Lift .500" at the valve
Overlap 78 degrees

This cam was also original equipment in the 410 HP solid lifter 427-4V from 1963 1/2 to 67.

Royce Peterson

 
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kevin
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209.240.222.131

Almost......

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June 16 2002, 11:35 AM 

The 306 cam ws used in all 4 bbl Low-Riser's, the 66-67 Med-Riser's, both single and dual four engines, and the 66 police 428 engine. It had 236 @ .050 and 114 lobe C/L. The Hi-Risers recieved the "K" suffix cam which became the stock dual four Low-Riser cam for 63-1/2-65. It had 244 @ .050 on 114 C/L. In 64 the Hi-Riser was developed for the GT-40 MK-II for the upcoming LeMans race. This employed what became the "B" or LeMans grind. Basically it is the 324 cam with closed up centerlines to 106 to be able to use the lower compression (10-1 vs 12-1) required to use the 100 (supposed) octane European fuel which the FIA mandated. Holman Moody supplied race engines came stock with the "Famous 310" that had 248 @ .050 on 108 C/L, .510 lift on both Hi and Med Risers. The Ford "D" cam had .600 lift, 275 @ .050, and 108 C/L FYI.

 
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