What is the extent to which you can safely bore a 400? I was thinking maybe .40 over, but maybe I should stick with .30? What displacement woudl that give me?
my 79 f250 4x4 has a .40 over 400 in it. it is know a 410. the 400 is really 402 cubes to start with. the truck runs great and never over heats. runs about 180 all the time.
You can go 60 over, but there are not many piston options. I would stick with 30 over if you can get away with it. Not a lot of difference between 30 & 40 over.
My 400 is .060 over, and runs great. It is very rare that it will get hot. The best way to be safe is to take the advice of your machinest. With the way scrap prices are right now, alot of old engines are finding their way to scrap yards, and being melted down. My advice would be to take as LITTLE out of the walls as possible to clean it up so you can have a few more rebuilds left on the block you have now.
the 20thou of an inch difference is not going to be the difference in running hot or not. The difference between 40 over and 60 will make no difference. Take out as little as possilbe to make it work.
the guy I bought my truck from,told me it was one of those comp. truck cams. not sure what one it is, but it works very well. dam thing could pull a house over. has an edelbrock intake and a 750 edelbrock carb.
I would never bore a block just for the extra displacement or for the extra performance that will provide.
Look at it this way: A 400 that goes to a 408 only gains 2% in displacement.
Gains are much easier to come by with raising compression, improved breathing
in working or replacing the heads and cam.
And it will not shorten the infinite life of the block.
Well, you don't have to. Everyone is entitled to their opinion, and everyone can do whatever they want with their engine. I plan on boring mine and beefing it up. When it craters, I'll get 460 or something. The only reason Im messing with this 400 is because it was given to me.
Well, you don't have to. Everyone is entitled to their opinion, and everyone can do whatever they want with their engine. I plan on boring mine and beefing it up. When it craters, I'll get 460 or something. The only reason Im messing with this 400 is because it was given to me.
jeje i bet you will fall in love with it as many of us have, and where there´s love there something to pay attention to....
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"All right baby, see what I´ve got right here in my hands, I´ve got it right in my hands to score you baby, I think im gonna yank on a one town! Look Out!" Uncle Ted
I bore my block .030. 3 cylinders have more than .030 in some spot. My machinist drive 3 sleeves and bore to .030. To my opinion don't overbore for power but just enough to make it run.
yup i did the same thing! we dont want that block to be sent of to china! It would be cool to have an aftermarket aluminium 400 block....
__________________
"All right baby, see what I´ve got right here in my hands, I´ve got it right in my hands to score you baby, I think im gonna yank on a one town! Look Out!" Uncle Ted
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