Thread: BBC 511ci what is it?

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I am looking at a BBC 511ci which supposedly has been made out of a 454 which has 4 bolt mains. I've never heard of this before so I'm hoping Pat or Erik will help me out? Just how far out would you have to bore a 454 to get 511ci and would the walls be paper thin? I don't want to commit myself until I know more of what I am looking at. Originally I am considering building a 496 stroker, but the price of this 511ci is very good.

Originally Posted by stylingZ

I am looking at a BBC 511ci which supposedly has been made out of a 454 which has 4 bolt mains. I've never heard of this before so I'm hoping Pat or Erik will help me out? Just how far out would you have to bore a 454 to get 511ci and would the walls be paper thin? I don't want to commit myself until I know more of what I am looking at. Originally I am considering building a 496 stroker, but the price of this 511ci is very good.

A 511 is a 4.375 bore X a 4.25 stroke.
This can be done using a stock block which is bored .125 over.
At this over-bore the walls can be paper thin.
I.M.O.,this is the very MAX. you can ever go on a stock 454 block.
It won't leave any room for clean-up.
I would not buy un-less the block has been sonic tested and you know who did the testing.
Even then it would bother me.

i would use the 4.375 crank and a 060 on bore or 070

Over the years I have built several 511's and had no problems. It is the "end of the line" bore wise however.

Then again if you have problems later on a sleeve is no problem.

I'd buy it if the pricewas right and it ran good.

Food for thought!!

i have built the 4.375 stroke and bore 4.320=513 CID or 4.375stroke and bore 4.310=510CID or 4.375 stroke and bore4.350= 520 CID with a short fill all them can be done with a stock block but would do a short fill on the 100 over with the 4.375 crank with H beam rods there is not much work getting it to swing thru .i have used some of the 4.375 cranks not to big of a deal

Originally Posted by stylingZ

I am looking at a BBC 511ci which supposedly has been made out of a 454 which has 4 bolt mains. I've never heard of this before so I'm hoping Pat or Erik will help me out? Just how far out would you have to bore a 454 to get 511ci and would the walls be paper thin? I don't want to commit myself until I know more of what I am looking at. Originally I am considering building a 496 stroker, but the price of this 511ci is very good.

just send it to me i will fix you up or i can send you a short block