The Manalishi

iTrader: (3)

I was watching Pass Time and a guy was on there in a C5 and stated he had a 461 CI LS based engine, I think he said Warhawk but am not sure. Has anyone gone this far with what is available right now. I have heard that the tall deck LSX block will go to 500 CI but I don't think its available yet. What is the biggest cube engine that is currently able to be built? I was under the impression that 455 CI was the absolute limit and it was very expensive and not worth the extra couple of inches. Can anyone post up the factual info as to what is possible. I realize these engines are expensive and not a lot of people do them but I am curious as to what is possible. Thanks a lot.

slammer454

it's quite possible to achieve 461CI with the low deck block. On my calculator that comes out to be a 4.250" stroke and a 4.155" bore. The absolute maximum currently availbile to my knowledge is 481CI.

needadvice

Only a moron would do a 4.250 stroke in any LSx type block. But *** clowns will do it to be cool.

Maybe the tall deck, but in a low deck you have to be a dumbass to do it.

4.155 bore is no problem, even a 4.185 bore (N/A) is no problem. The stroke is limited if you want an engine that'll be worth a damn and not burn massive amounts of oil right out of the gate.

4.185 bore x 4.100 stroke = 451 ci......that the best bet for N/A.

4.125 bore x 4.100 stroke = 438 ci.....that'll make for a monster FI engine.

racer7088

468 is the largest that will work fairly easily in a short deck block. We've done several like that and they work great. You have to know what you are doing though.

racer7088

We've done quite a few with no issues but then again we know what we are doing unlike the people you are probably dealing with. I've already rebuilt other 4.250 stroke LSx deals that had some big miles on them with no problems and then I've worked on some with BIG issues.

You are right that many things can go wrong for your average "*** clown" level engine shop though that has no clue. The bigger cranks like that are not for your average engine shop that just does cookie cutter type stuff. It is a very tight fit and with the wrong parts can be a real pain!

I certainly wouldn't do one in a normal OEM block with the short cylinders although the ones we have seen weren't as bad as I would have expected but they were oil burning pigs for sure. Of course that had nothing to do with the 4.250 crank.