454 vs 489
#31
Registered
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
#33
Registered
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
#34
Registered
iTrader: (2)
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
Posts: 6,306
Likes: 0
Received 1 Like
on
1 Post
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..
#35
Registered
Join Date: Jan 2009
Location: Mesa, Az
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
And for its worth again, my last build was 454 to 489 and picked up 6-7 mph in my 23.5 Arriva