time to get my build going help
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Elder User
Joined: Jan 2004
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From: Eastern Pa
time to get my build going help
Finally ready to get my build going and would like some input for what pieces I should fit together. I have Steve Christs book whick is helpful but I need to take cost and feasability of parts available into account. I have a 73 4X4 shortbed, 390, 4 spd, 4:10 gears. Truck will be driven frequently but not off road. I'm looking for real good street performance. I would like to use a roller valve train and cam. For now I'm going with some worked C8AE-H heads with the thought to go better down the road. Want to get the highest compression possible with the 94 octane we have around here. so need help with the dynamic cr. I have a 2u crank and C6AE-C rods which I could recondition but I would go with a different crank if the results would justify the change. Headers and duals are a given. I know this is a little long but it's time to get going the block goes to the shop tomorrow. Thanks for your help.
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
Are you sure it is a 390? It didn't come with one from the factory if it is. The smaller Crane 521 roller would be great for a torque monster that would still pull hard through a wide power range. You could easily run 10.25:1 compression with it on 94 octane. I would run the TRW L2291F pistons. They will get you real close. The bigger the crank you put in the more the torque curve will shift down in RPM and up in nunmbers. A 4.25" stroker crank is only $700.
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Elder User
Joined: Jan 2004
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From: Eastern Pa
My mistake on the block #. THe c6me covers alot of engines but the 2U crank andC6AE-C rods indicate a 390. Ratsmoker, what about rocker shafts and supports for that 521 cam? I believe I've read here that the magic number for stock rocker shafts is 600 lift. I also read I think from a DSC ad that the main problem are the end stands. What seems to be the necessary items for a cam like the 521? Also is the stock cam thrust plate sufficient or is it recommended to go with one that some of the aftermarket companies sell?
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
tasty,
If you're dropping the cash to run a stroker crank and the Crane 521 roller cam , then the stock valve-train has to go. look at the Ersons complete aluminum stands, shafts and rockers for the Fe. Around $650. I consider .550" to be the realistic limit of the stock valve train.
I run a 4.125" SCAT crank and the crane 521 cam...I'm running the stock cam thrust plate, no issues.
see some of the info here (take some of the motor links):
http://www.thedreyerfamily.com/69f25.../67project.htm
If you're dropping the cash to run a stroker crank and the Crane 521 roller cam , then the stock valve-train has to go. look at the Ersons complete aluminum stands, shafts and rockers for the Fe. Around $650. I consider .550" to be the realistic limit of the stock valve train.
I run a 4.125" SCAT crank and the crane 521 cam...I'm running the stock cam thrust plate, no issues.
see some of the info here (take some of the motor links):
http://www.thedreyerfamily.com/69f25.../67project.htm
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Elder User
Joined: Jan 2004
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From: Eastern Pa
No I'm not going to be doing the stroker crank, would love to but that's alot of scratch. Are the stock cranks good for 5500-6000rpm?
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Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
Originally Posted by tastyklair
No I'm not going to be doing the stroker crank, would love to but that's alot of scratch. Are the stock cranks good for 5500-6000rpm?
Oh yeah...should be no problem!
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From: Mount Laurel NJ
Originally Posted by tastyklair
No I'm not going to be doing the stroker crank, would love to but that's alot of scratch. Are the stock cranks good for 5500-6000rpm?
I ran a mild cam (around 215 duration with around 510 lift) in my 390 with an RPM intake and headers and dual exhaust, and C7AE (basically the same as C8's) heads in an other wise stock motor. It was in a 73 F250 4x4 long bed. The truck would easily spin the 33's with 410 gears. It was a real; stout combo with great low end torque that would spin well past 4500.
If you are not making big changes in the heads, intake and stall speed, then a big cam will do nothing for your performance except kill low end torque.
Paul G.
Last edited by Paul Garvin; Oct 5, 2004 at 12:16 PM.