Cam Specs on a standard 502 GM Marine engine?
I am in the process of a repower on a Donzi 22. I went with the 502 crate (marine) from 1800runsnew.
I called and asked them what the cam specs are and their response was that G.M. keeps those specs close to their chest and that they did not know the specs. ...sounds like B.S. to me but that is as far as I got. Does anyone know what the cam specs should be? ...standard 502. I am trying to order a distributor from DUI and they ask for the cam specs so they can set the advance up properly. Thanks, Jay |
ENGINE MODEL
454 MAGNUM 502 MAGNUM 8.2L Lobe Lift + .020 (0.051) Exhaust .342 (8.687) Intake .342 (8.687) Duration at .050 In. (1.27 mm) Cam Lift Exhaust 227° Intake 211° Journal Diameter 1.94282-1.9492 (49.485-49.509) Journal Out Of Round .001 (0.025) Maximum Camshaft Runout .002 (0.051) Maximum Timing Chain Deflection 3.375 (9.5) from taut position [total .75 (19)] |
Found that @ Perfprotech.com
Do a little looking on yahoo or google. It is not hard info to find. No secret. It would be mercruiser info not gm you would be looking for. |
GEN 6 Billet Roller Cam
Mercruiser 454 502 Mag Roller Merc# 431-850478 / GM#12551622 .004 300*/ 300* .006 288*/288* .050” 225*/225* .200” 125*/125* Lift .483”/. 483” ICL 109* LSA 115.5* I also purchased two brand new engines from 1800runsnew Took them apart to put in RMBUILDER cams, and did some headwork. Best of everything, no problems whats so ever. |
Originally Posted by 1BIGJIM
(Post 3616492)
GEN 6 Billet Roller Cam
Mercruiser 454 502 Mag Roller Merc# 431-850478 / GM#12551622 .004 300*/ 300* .006 288*/288* .050” 225*/225* .200” 125*/125* Lift .483”/. 483” ICL 109* LSA 115.5* I also purchased two brand new engines from 1800runsnew Took them apart to put in RMBUILDER cams, and did some headwork. Best of everything, no problems whats so ever. |
Yes, I had to change the springs to match the cams.
As always, great idle, they pull to 5,000rpms no problem. The other reason I wanted new cams, was to get a fuel pump lobe. If I had to do it all over again, I would have saved the money for $4.00 a gallon gas.:grinser010: |
Originally Posted by 1BIGJIM
(Post 3616908)
Yes, I had to change the springs to match the cams.
As always, great idle, they pull to 5,000rpms no problem. The other reason I wanted new cams, was to get a fuel pump lobe. If I had to do it all over again, I would have saved the money for $4.00 a gallon gas.:grinser010: |
Originally Posted by A.O. Razor
(Post 3617095)
4$? C'mon. You should try boating around here. 9$ a gal.:whistle::daz:
|
Originally Posted by 1BIGJIM
(Post 3616492)
GEN 6 Billet Roller Cam
Mercruiser 454 502 Mag Roller Merc# 431-850478 / GM#12551622 .004 300*/ 300* .006 288*/288* .050” 225*/225* .200” 125*/125* Lift .483”/. 483” ICL 109* LSA 115.5* I also purchased two brand new engines from 1800runsnew Took them apart to put in RMBUILDER cams, and did some headwork. Best of everything, no problems whats so ever. |
Thanks All.
My plan is to run it for a season and then consider going for a cam change too. |
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