rebuilding a rebuilt slant
Maybe Ed/805 Moparkid,will chime in. His /6 was healthy, & and a daily driver......
Thanks Bomber
Well i guess it depends on how "wild" you want it. I would assume you want to be able to run pump junk 91 octane so your limited to about 8-8.2:1 dynamic compression. With that and a 10:1 static your going to be in the mid 230's (~235)* @ .050 on the cam duration. That will give you the most for under 5800rpm. Call Oregon (OCG) and they can get you a regrind for real cheap, but its a good product. You can run the stock pushrods until you mill .150" off the deck surfaces so i would give smithBro's a call and order a correct length set from them, and order 2 or 4 extra! I run the JP/Rollermaster billet timing set as the parts store set lasted 6000 miles lol. What else....
Headwork is 90% of the game with these. since your going low rpm i would stay with the stock exhaust valve but run a 1.7 (enginbildr) on ebay intakes of even bigger, 1.7-1.8. Then have the porting done, "blueprint" the ports for the highest and lowest, then raise the intake ports .100". Have all the port work and bowl work done and you'll be in good shape.
Somethings i picked up
-Mill as much as you need off the block, and only a clean up on the head, helps keep the valves in the head and away from the piston and cylinder walls
-open up the main/rod clearances from stock (.0005-.0015) to .002-.003.
-you can order a second set of half grooved main bearings for a 440 and use the grooved bearing shell on the block side, not cap. I dont know if you can order a half groove or if you have to do a full and then order a no groove set as well. this will get more oil around the crank but you wont have the loss of surface area like a full groove.
-Oil pumps on these are the weak point, "new" oil pumps has gears that are not properly heat treated and will fail quickly. I think frank (66acuda) sells rebuilt pumps with hardened gears.
-DO NOT RUN A COMP's CAM, they nitride their cams and it eats oil pump gears
-if you run main studs becareful as they sometimes block oil passages!
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