391 component questions
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391 component questions
Ok I have aquired a complete 391 engine, and through gathering information I have learned that these engines have a forged crank and a thicker block, that is in many cases is thick enough to be bored to a 4.13 or 428 size hole could I use the 391 crank and make a 406? I was thinking use the 9qt oil pan from this heavy duty engine and the forged crank and the block to be bored and then use some edlebrock heads hot cam and other goodies.
Is the crank the same stroke as a regular 390 only Forged?
What is the advantage and is it nessesary to turn the nose of the crank?
Is it true that the block can make the 4.13 bore?
Is this a good Idea or is it going to take a ton on mula to get it done?
Will this give me a good solid bottem end and a potentially hi po motor?
Thanks in advance for any help
Is the crank the same stroke as a regular 390 only Forged?
What is the advantage and is it nessesary to turn the nose of the crank?
Is it true that the block can make the 4.13 bore?
Is this a good Idea or is it going to take a ton on mula to get it done?
Will this give me a good solid bottem end and a potentially hi po motor?
Thanks in advance for any help
Last edited by swampo; Jun 30, 2004 at 09:48 PM. Reason: spelling
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Interesting idea, but I'd just bore it enough to clean it up. Put some CJ valves in the edelbrock heads too, they help. You'll want to run a standard FE distributor so you can use a standard FE oil pump shaft, standard FE intake, and standard FE oil pump. You'll need the Ford truck block distributor bushing, sold at DSC.
Now to answer your questions in order:
Yes.
None if you keep the FT timing cover, balancer, and pulleys.
Usually. Have it checked for cylinder wall thickness before having it bored. Like I said, I'd just bore it enough to clean it up and use oversize 390 pistons.
Good idea. I wish I had access to a 391.
Definately. The FT's have a bulletproof steel crank, reinforced main webs, and tougher block metal with manganese and other alloys. Using good ARP bolts on the mains and crank, I wouldn't be afraid to run a 400hp nitrous shot and a big cam. One thing to do, though, is to take it to a machine shop and have the bottom end internally balanced, as opposed to the FT external balance.
Good luck!
Now to answer your questions in order:
Yes.
None if you keep the FT timing cover, balancer, and pulleys.
Usually. Have it checked for cylinder wall thickness before having it bored. Like I said, I'd just bore it enough to clean it up and use oversize 390 pistons.
Good idea. I wish I had access to a 391.
Definately. The FT's have a bulletproof steel crank, reinforced main webs, and tougher block metal with manganese and other alloys. Using good ARP bolts on the mains and crank, I wouldn't be afraid to run a 400hp nitrous shot and a big cam. One thing to do, though, is to take it to a machine shop and have the bottom end internally balanced, as opposed to the FT external balance.
Good luck!
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