i currently have a 1973 429 i am looking to build a 572 or something close for a mud truck i need to know if this block will work or if i need a 460. i know that the only difference is the stroke but is the block height the same for both engine any help will be appretiated.
Was there stroker kit you found advertised as a 572? Just curious where you got this particular displacement from. Most of the larger stroker kits will use a 4.5" crank. Regular bore with this crank gived you around 538CI. If you bore .60 over with a 4.5" stroke you come out around 545. To get to 572 you'd have to be boring to about 4.5" diameter as well. Problem is you don't have enough meat on the cylinder walls unless you have an SVO block. Or maybe they make a crank for regular big blocks which has more than a 4.5" stroke?
I think the most you can squeeze out of a stock big block is 550-560 CI. I just don't like the idea of boring the block that much. Let me know if you've found a bigger crank though, because I want one!
Same-o-same-o. Just the crank crank/pin height changes. You have a 460 as far as the bare block knows :] Get a 4.5" crank and go for it.....dont forget to do the ultrasonic thickness (UT or sonic check are other common terms) to check on the bores before you go-for-broke with the hone.
I see a 557 on Flatlander and then a 605 which I believe is SVO only. Am I missing something? 557 is 4.5" stroke bored .80 over if I remember correctly. To be real I don't think anyone will notice the difference in power between a 572 and 557 though. But I personally would prefer to stick to a .60 over bore, a little insurance. Plus if you have to rebuild you still have a little room to clean things up. If you bore .80 over where do you go from there?
"If you bore .80 over where do you go from there?"
If your biulding a 572 stroker and bore a stock block most would assume you weighed the pitfalls and made a choice. Also your playing with a cheap disposable stock block, its not a huge loss if it gets wasted...and if it is to you....you most likely would have gambled on it....There are some DO blocks that take kindly to .080 and some may not mind .120 over, but again it boils down to doing the UT, deciding what exactly you are working with, and how much risk you are willing to assume.
BTW- Your correct on flatlanders listing of the Ford 460 Block/557 cu. in. (.080 over)
And that is on a ford block. THe 605 and up are on a FMS or IDT block.
This is true Puller, I guess I just prefer to play it on the safe side. The blocks may be cheap but the machine work is not. May as well make is last a while. Would be really nice to get one of the racing blocks but the key words there are: Cha-Ching!
Puller motors much like drag racing motors are often "filled" blocks, where the water jackets are partially filled with a cement like goop for strength.
If one is going that route, you can radically overbore the block to the point the cylinder walls are completely gone, grind, machine and weld together liners, then insert them as a complete unit and braze them to whats left of the block.
Radical machinery, but you can get darn close to 600cid that way. I saw this occur once in my life, and it was an amazing thing to watch, actually.
My poor old memory is dredging up a magazine article I saw, oh, 8 or 10 years ago where someone used an SVO block and built a 700+ cuber that was making something on the order of 900 hp and 1100 lb-ft torque on pump gas. Can anyone verify this or am I just (mis)remembering?
Think stroke not bore. The 460 is one of the best if not the best block for throwing a huge stroke to it. The chevy boys arent even close to this. They have to end with the 502 in the old stock blocks. Ford you can get 593 out of a stock 460 block!
The 572 is a 4.5 bore and 4.5 stroke. The stock deck 10.3 cannot be built to 800 plus. The stock blocks have been know to go .140 over I have only seen a few that could go .110 over with a sleeve or two. I ran a .100 over block for 8 years in my bogger. The SVO can be bored to 4.6 and the IDT can be bored to 4.7 You can run alot more stroke them then the 4.5, we have run 4.6 and 4.75 in these and stock blocks that are highly modified. I agree about the partial fill of the blocks. You can still cool it but you get the rigidness in the lower half of the block. Add 4 bolt main caps or a good main girdle and you can run some pretty stout power through them. After 800 or 900 horse just buy a block for $2000 from IDT. You can get 589 to 593 with a stock block bored .85 over and 4.75 stroke.
Last edited by monsterbaby; 05-13-2008 at 11:10 PM.
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