502 cam selection (flat tappet)
08-01-2019 | 05:56 AM
#1
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502 cam selection (flat tappet)
Wondering if anyone knows a good close to stock replacement cam for my gen v 502 mag mpi, just looking for a close to stock maybe something a little better that I can use with stock springs.
08-01-2019 | 07:54 AM
#2
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From: Virginia Beach
This has been a popular topic over the years. A search will drum up a lot of information (via Google... include "offshoreonly" in your search terms).
With the above said it would be best to stick with the stock camshaft in order to avoid having to mess with the ECM. Any changes will more than likely require tuning to keep it running correctly. These engines can be very sensitive to changes; the last thing you'd want is to burn it down.
I've had thoughts of upgrading my Gen VI 502 MPIs, but in the end it's too much work and expense for gains that may give you a mile per hour or two. If I do anything with these, they will be turned into 540s with either carburetors or aftermarket (Holley) fuel injection.
I'm sure others will chime in. Good luck!
With the above said it would be best to stick with the stock camshaft in order to avoid having to mess with the ECM. Any changes will more than likely require tuning to keep it running correctly. These engines can be very sensitive to changes; the last thing you'd want is to burn it down.
I've had thoughts of upgrading my Gen VI 502 MPIs, but in the end it's too much work and expense for gains that may give you a mile per hour or two. If I do anything with these, they will be turned into 540s with either carburetors or aftermarket (Holley) fuel injection.
I'm sure others will chime in. Good luck!
08-01-2019 | 08:37 AM
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I’m only getting another cam because I got too, my wore one lofter out for some reason I haven’t fiqured our yet, but I would like a stock cam just don’t want to pay the oem price that’s why I want aftermarket as close to stock
08-01-2019 | 12:35 PM
#4
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From: On A Dirt Floor
I believe the stock cam is the GM one below that ends in '209'
Originally Posted by SB
Mag BBC 454/502 Flat Tappet (rect heads)
.004” 296*, 296*
.006” 286*, 286*
.050” 224*, 224*
.200” 130*, 130*
Valve lift with 1.7 .510”, .510”
LSA 115.5
Merc Part#431-9830 / GM#14096209
ICL 114 ATDC
ECL 117 BTDC
GM Part#10185060 (same as above but ground with 5 degrees advance)
ICL 109 ATDC
ECL 122 BTDC
.004” 296*, 296*
.006” 286*, 286*
.050” 224*, 224*
.200” 130*, 130*
Valve lift with 1.7 .510”, .510”
LSA 115.5
Merc Part#431-9830 / GM#14096209
ICL 114 ATDC
ECL 117 BTDC
GM Part#10185060 (same as above but ground with 5 degrees advance)
ICL 109 ATDC
ECL 122 BTDC
08-02-2019 | 07:43 AM
#5
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Posts: 4,295
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From: Virginia Beach
If you lost a lobe or lifter, I’d be concerned with metal in the bearings. At a minimum I’d cut open the oil filter to look for evidence of damage.
If you’re already in the middle of a rebuild, then disregard.
If you’re already in the middle of a rebuild, then disregard.
