Maximum bore size for 1978 460 CID
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Maximum bore size for 1978 460 CID
I would appreciate very much some information from whomever would like to help me with my project. I have a 1978 Ford F-250 with a block which has already been punched to .030 over. Because the chap that originally bored it for me goofed, I must now consider whether or not to have it bored to .040 over. I have read in several publications, that due to the thin-wall casting; it is recommended that the bore not exceed .030 over. I would like to go to .040 over, and would like to know if this is a mechanically sound thing to do. Any info would be very much appreciated. Thank you in advance for your help.
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Joined: Jan 2008
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Maximum bore size for 1978 460 CID
Try the 429/460 forum or the engine re-building forum.
I've heard them go .060 over with no real problem.
That would be an awful thin wall though, with possible cooling problems.
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
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Need to decode your 78 Truck data plate? click here
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[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V [/font]
I've heard them go .060 over with no real problem.
That would be an awful thin wall though, with possible cooling problems.
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
Need to decode your 78 Truck data plate? click here
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven!
[/font]
Feel free to visit my website.
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color =red] Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V [/font]
Cargo Master
Joined: Aug 2000
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From: SW Michigan
Maximum bore size for 1978 460 CID
Bore away ! Have no fear. I work in an engine shop and we bore the 429/460 blocks .060 ever every week with no problems. We have also assembled some .080 over combinations for truck pull guys, and they haven't come back complaining about any problems......where this 'thin-wall' nonsense ever got started I have no idea. DF
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