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I have a 1978 super cab F250 with 6" lift and 42" tires rolled by 5:13 gears with Detroit lockers on both ends. It has a C6 heavy duty Stage 2 backed by a NP205.
I use it almost every day in the winter in the Rocky Mountains at 7000 feet of elevation. We call it snow boggin' locally. Think of a combination of rock crawling, desert racing, sand duning and mud bogging all in one trip. Part of the time I need to idle around and part of the time I need high rpm. I have been running a 9.3:1 375 hp 400 using Tim Meyers engine kit but continually have issues inherent to the 400 and have just spun a rod bearing. I want to build a big block this time.
I already have two motors to choose from. A D1VE block D3VE heads internally balanced 460 out of a 1977 F250 or an externally balanced 460 from a 1985 F250 with D9TE-AB block and more D3VE heads. I am wondering about doing a mild stroker to run on 87 octane in the 9.0 to 9.5:1 c/r range. I am thinking the Scat kit and bore to reach 521ci. I know I will be using mass air MPFI which requires a single plane intake . I am thinking of using a mildish cam to keep it streetable but have the intake and heads flow for the top end. Is this a reasonable plan for something of a daily driver or is their too much maintenance involved with a stroker? Will I have to pull the pan to check for bearing walk often? Will I have problems with valve springs? What things am I not thinking about that might give me problems?
If this is a reasonable motor to build I have more questions. Which block should I use assuming they pass magnafluxing? Does the D9TE having "deeper" cylinders matter that much for the stroker I am considering? How much trouble is it to match a flexplate to an external balanced engine? What single plane intake should I use? What grind of cam should balance my needs? Should I have some port work done on my D3VE heads and larger valves or should I find D0VE C8 or C9 types? Do I need to go with aluminum? Would Performer RPM be enough or do I need TFS Street?Will I need a high-volume oil pump? If so will I need a pan with a windage tray? Is my current dual 2.5" exhaust through offset Magnaflows enough or do I need 3"? What horsepower would this combination give me? I am not inerested in huge hp numbers breaking the rest of my drivetrain. What else am I missing? Sorry for the long post but I have been lurking and searching a lot and haven't found definitive answers to my specific build.
I use it almost every day in the winter in the Rocky Mountains at 7000 feet of elevation. We call it snow boggin' locally. Think of a combination of rock crawling, desert racing, sand duning and mud bogging all in one trip. Part of the time I need to idle around and part of the time I need high rpm. I have been running a 9.3:1 375 hp 400 using Tim Meyers engine kit but continually have issues inherent to the 400 and have just spun a rod bearing. I want to build a big block this time.
I already have two motors to choose from. A D1VE block D3VE heads internally balanced 460 out of a 1977 F250 or an externally balanced 460 from a 1985 F250 with D9TE-AB block and more D3VE heads. I am wondering about doing a mild stroker to run on 87 octane in the 9.0 to 9.5:1 c/r range. I am thinking the Scat kit and bore to reach 521ci. I know I will be using mass air MPFI which requires a single plane intake . I am thinking of using a mildish cam to keep it streetable but have the intake and heads flow for the top end. Is this a reasonable plan for something of a daily driver or is their too much maintenance involved with a stroker? Will I have to pull the pan to check for bearing walk often? Will I have problems with valve springs? What things am I not thinking about that might give me problems?
If this is a reasonable motor to build I have more questions. Which block should I use assuming they pass magnafluxing? Does the D9TE having "deeper" cylinders matter that much for the stroker I am considering? How much trouble is it to match a flexplate to an external balanced engine? What single plane intake should I use? What grind of cam should balance my needs? Should I have some port work done on my D3VE heads and larger valves or should I find D0VE C8 or C9 types? Do I need to go with aluminum? Would Performer RPM be enough or do I need TFS Street?Will I need a high-volume oil pump? If so will I need a pan with a windage tray? Is my current dual 2.5" exhaust through offset Magnaflows enough or do I need 3"? What horsepower would this combination give me? I am not inerested in huge hp numbers breaking the rest of my drivetrain. What else am I missing? Sorry for the long post but I have been lurking and searching a lot and haven't found definitive answers to my specific build.