502 rebuild
10-18-2018, 12:10 AM
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502 rebuild
I bought a Mark VI 502 to replace my 92 454, looking to build it up to around 600HP. This is my first build so please bare with me on my inexperience. Would like to keep it dependable and fast, best of both worlds! Still trying to figure out stock head cc on 088 rectangle port, what cam to go with and how to figure out cam lift and duration for a motor build. planning on having head work done just don’t know what to have done yet🤔. Looking for a build sheet to work off of and any suggestions or criticism. Will be purchasing new cam, pistons and possibly new heads. Have about 5K to work off of. 509 sounds good but no diffident direction yet. Thanks
10-18-2018, 01:16 AM
#2
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What do you have for exhaust?? Intake manifold?? Carb??? If you need all them, used parts will be around $2500 and new parts would be around $5000
Even if you already have good exhaust, your 5k budget is most likely not going to cut it for a full rebuild.
Even if you already have good exhaust, your 5k budget is most likely not going to cut it for a full rebuild.
10-18-2018, 06:55 AM
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Thanks Griff looking at Arizona speed and marine intake if I keep the EFI system and either Dana or Lightning headers my budget wasn’t including headers Will be closer to 8-10 by the time I’m done. Plus still need to upgrade to dual steering stabilizers. It’s only money !
10-18-2018, 07:05 AM
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IMO don't waist money reworking the 088 heads, put it towards a set of good used or new heads......the Merc 525 EFI cam is a solid piece and will work fine with the stock dog bone lifters in the gen 6 block.
10-18-2018, 07:46 AM
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I made over 600hp on a 548 BBC with 088 heads but they did have some intake and bowl work done to them. Your easiest way to make that HP is with a good set of heads matched to a good cam.
10-18-2018, 08:23 AM
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Any recommendations on witch heads to go with, CC, valving and anything else I’m not thinking of. would like to stay away from anything China made. USA ����
10-18-2018, 08:27 AM
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10-18-2018, 12:26 PM
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502. Comp cam. EQ heads basically box stock. 8.7:1 compression. Merlin x intake. Quick fuel 850. 565@5800. This was through etops in full marine trim on the dyno. Had I used dyno headers like most it would easily be over 600. Also having sweepers or eickerts would have jumped power by 30+. Very happy with the builds and the boat runs phenomenal. Any questions let me know.
Mike
Mike
10-18-2018, 07:47 PM
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Last edited by hogie roll; 10-18-2018 at 07:59 PM.
