.100 over on a Gen V

[wannabe]

I am looking at the giant hole in the side of my piston and wondering, like djunkie what route to go. I am a pretty firm believer in no replacement for displacement and will likely be doing my motor in stages.
I have a '91 Gen V, can I go .100 over on that? I am going to go with a .25 stroke and was wondering if .100 is OK?
Thanks

[SmokinLowriderSS]

I believe I have heard of even larger being done, up to .125 (1/8") but let some actually experienced folks come and either back me up or shoot me down before taking it as gospel.

[stix818]

We've punched them out that far but not as river/lake runners. That's starting to get thin. You could fill it but don't know what conditions you are running under??

[SmokinLowriderSS]

From Stix's input, I think I'd try to stay @ .060" over if possible. Do you have bore damage forcing the .100 overbore?
A '91 GenV, is it a 454, 496, 502? Can you stroke it instead? You really gain displacement a lot more from a longer stroke crank than from an overbore.

[ECeptor]

Just go 0.060" over with your 4.25" crank and have a nice 496.
I've heard anything larger than 0.060 and you run the risk to too thin of walls to the water jackets. Going up to 0.100 only gains you 9ci or ~9hp.
Not worth the risk, imho.
With that said, I've heard the old tall deck engines (like the truck 427's) can go 0.125" over and can handle a 4.375" stroke to yeild 526ci. But then you need different exhaust routing, intake, distributor, etc.
How much can a 502 be safely bored?

[victorfb]

anything after .060 i would either fill it and use it on the track, or junk it and let someone else take the gamble. JMHO.

[cstraub]

As some have said I have seen these taken to .125" over. We are dealing with a casting hear and core shift will dictate what you can and cannot do. Find a shop with a sonic tester and have the block checked to see what can be done. BBC .070" pistons are pretty common now to. You may look at that for a little more CID.

[wannabe]

It's a 454 and I think will be able to get away with .060 but was looking for a few more cubes while I was in there. It doesn't cost anymore to go .100 than .060 so that's a free 9HP!!! But I will probably stay with the .060, doesn't sound like .100 the norm. I am looking for realiability too so sounds like my question is answered. Thanks to all!! 496 here I come.