420-425 cam?
 

I have looked high and low but can not find and was wondering if any one knows the specs to the old merc. 420 / 425 HP 454's the merc part number is 451-7892. Let me know if this is right or wrong and any info. Thanks Rag's

Re: 420-425 cam?
 

Rags,
Here are the specs:
298*/306* @005
228*/236* @.050
.530"/.551" @ 1.7
.312"/.324" lobe
74* overlap
springs
120#@1.875
320#@1.355
Bob

Re: 420-425 cam?
 

BTW-It's a flat tappet cam.

Re: 420-425 cam?
 

Wouldn't a roller cam give you more power? I have heard of numerous 454 magnum rebuilds that have dyno'd at 500+ hp

Re: 420-425 cam?
 

Rags, you can get that cam a lot cheaper from Crane. Pt. no. 132561.

Re: 420-425 cam?
 

I have a 500 hp cam, intake, roller rockers, and lifters if you would be interested

Re: 420-425 cam?
 

rmbuilder, PatriYacht, you to are the best. klaw shoot me a price. I think it is more then I want to spend but what could the info hurt? Wow that is a spice cam for a medium to low compresion 454 in a boat. Just tying to chrunch HP and dollar numbers to fix my 330HP. Does any one buy chance know what merc instaled it at? 110? 105? thanks Rag's

Re: 420-425 cam?
 

Rags,
Straight up the ICL is 109* on a 114* LSA, so you're +5* advanced.
Bob

Re: 420-425 cam?
 

Its the same cam as the stock 525SC cam. Crane makes another cam that is very close in specs and comes in kit form cam part #134241, kit part #134242. It was way cheap compared to the 525sc cam. Like $150 for the kit at Summit.

Specs are .534/.553 and 226/236 on a 112 lobe sep.