I have a question, probably been asked before.

For sake of discussion, is .060 over too much on a 460 block?

I saw in the Pat Ganahl, Ford Performance book that its not recommended to bore one over .030.

Thanks.

 

.060 is fine. Many will go .125 but better to have it sonic checked over .060.

 

I talked to 3 shops in my area that said they will go up to .60 over but no more. They did say that you CAN go more, but you'd better take it to a really good shop for that. Usually a place that specializes in race engines.

The most common comment I've heard in regards to boring street engines is "Go as little as possible.".

Kevin K.

 

Yeah, if you are just rebuilding, go the minimum overbore. Rule of thumb... Boring .060 and more can lead to problems with over heating and if you have a "core shifted" core you might strike a water passage if you go much more, unless you do have the core checked.

You could also sleeve the engine if you have an engine that really needs a lot of overbore.

I have not done a 460 engine so just speaking about things in general.

Good Luck,

Jim Henderson

 

Thanks for the replies.

When I saw that statement in that book, I was puzzled. I had thought I had seen on here where people had bored .060 and not had any problems. But I also understand that here and there, stuff happens.

 

It probably depends on which block you have to. If you have one of the older 68-78 blocks i think it is, I think you can go quite a bit, like .080 is safe, at least that is what i have read.

 

Many aftermarket businesses sell strokers with .125 overbore. All it takes is a sonic check of the block to determine if you have a core shift. .060 is fine on the older blocks.

 

Whatever you end up boring too make sure pistons and ring sets are readily available. When I was running my 514 c.i. I had to wait almost 4 months to get a set of .080 over rings when it came time to freshen-it up between racing seasons. I also purchased two sets of SCJ bare blocks...one sonic checked for an .080 overbore, one did not.
Deen

 

I had a guy literally give me a complete 460 out of a 75 Lincoln it was in pieces, but who cares the price was right. As everything was in a box or coffee can. DiVE block and D3VA - A2A heads.

His wife told him it was time to clean out the garage. We all know how that goes.

I am thinking of going through this engine and just was curious about that not boring more than .030 over statement for for the sake of gathering the knowledge.

 

I agree with going minimum to ensure clean-up on a rebuilder. In any case I wouldn't go past .060" and on any bore job on a 460 I would insist on the machine shop using torque-plates. Some shops charge extra for this but it is worth it. If your shop doesn't have them go somewhere else. A 460 block isn't the stiffest block out there and don't have the thickest sleeves, not using torque-plates can cause serious clearance issues and scarred pistons, rings, and cylinders (or worse) under heavy load.
Doug

 

i have a 460 bored .080 over? my cuzin is building it, becuz he builds racing engine for a living... and their is another guy there thats going .120 over nutz..... but his is a dragster mines going in a 56f100

 

i got one out here thats .060 and wana punch it .080 hope itll work

 

go .080 and throw a 4.5" rotating assembly in and have a 557.

 

ok dragging up a really old thread. first I see one post that is wrong on here, the older blocks are NOT any better. we proved that a few years ago at the block summit after sonic testing 36 block in one day (as well as looking at a bunch of other older sonic tests) second someone posted that it was typical for stroker kits to go .125 which is wrong there is NO off the shelf piston for a .125 bore, nor is it typical for guys to bore them .120 overbore (4.480 is a REALLY REALLY odd bore size, so who ever told you that one doesn't know much about BBF and run away from them fast and never ever let them work on your engine) some guys WILL go .140 overbore to make a 4.5" bore (with a 4.5" stroke makes 572cid) but almost 100% of them also sonic test then sleeve at least one cylinder to do it too, and usually 2, my block would go to that if I sleeve 4 cylinders.
Basic rule of thumb 75% of these blocks will go .080 without a problem, it's basically safe to bore .060 without testing anything more you should sonic test and go from that, and yes that means the 557 kits REALLY should be sonic tested first, just in case you have one of those 25% and no the year of the casting will make no difference whatsoever not even boss 9 and SCJ blocks are an exception to this.

 

The only block exception is the motorsport block with siamesed cylinder bores. Mine is a 4.440 bore .080 over and runs cooler than most stock blocks at .030 over. ANY production block in my opinion is only safe to .030 without sonic checking.