454 vs 489
02-06-2010, 06:02 PM
#31
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I dont know what year they made the mk 4, 502 blocks. There was a set of motors built with them on sale here not that long ago. I think they are very few and far between, because they went to the 1 piece rear main seal very soon into producing the 502. I am sure they would cost you more then a set of dart or merlin blocks anyway. Using the adapters to put a two piece rear main crank in a one piece rear main block is a good alternative. The oiling setup on the gen6 blocks is improved over the mk4 blocks from what I understand. The aftermarket blocks also take advantage or the oiling upgrades too.
You are correct that the newer blocks have better oiling.
Eddie
02-07-2010, 01:15 AM
#33
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Yes. Get em. They aren't that easy to find used. They are available new for somewhere around $1500. I may be able to find a few a little cheaper. Had a line on a few a while back, but I really didn't need them. Let me see what I can come up with. I'll let you know.
Eddie
Eddie
02-07-2010, 10:43 AM
#34
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Fixx
The biggest issue with the mark 502 was cooling issues.the newer gen v was revised for better cooling then they did another revision on the gen6 to make it better and also decided to add the roller cam set up..
03-08-2010, 02:58 PM
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And for its worth again, my last build was 454 to 489 and picked up 6-7 mph in my 23.5 Arriva
