Cam Specs on a standard 502 GM Marine engine?
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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
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
#2
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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)]
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)]
#4
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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.
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.
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Location: Denmark and hopefully some place nice
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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.
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.
#9
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Join Date: Dec 2007
Location: Detroit River/ lake Erie
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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.
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.
Last edited by Rockfish71; 02-14-2012 at 07:45 AM.