Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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62Healeyhacker
Jerry Jackman

(19 posts)

Registered:
04/11/2009 10:58PM

Main British Car:


I want to use a crossbolted 4.0 block but only have small journal crankshaft.
Posted by: 62Healeyhacker
Date: March 22, 2023 08:28PM

Is there a way to adapt the larger, 2.5 inch, mains in the block to the crankshaft with the Buick 215" 2.3 inch journals?


MGBV8
Carl Floyd
Kingsport, TN
(4517 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: I want to use a crossbolted 4.0 block but only have small journal crankshaft.
Posted by: MGBV8
Date: March 23, 2023 09:53AM

Over the years, that is one trick that I have never come across. It will be faster & cheaper to find a 4.0 crank or a 3.9 block.


turbodave
dave cox

(183 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Re: I want to use a crossbolted 4.0 block but only have small journal crankshaft.
Posted by: turbodave
Date: March 23, 2023 10:31AM

Find a block from a 1995 discovery - even better if you can find one with a build date in the second half of 1995, and it'll have the tall caps in the block. It won't be cross-bolted, but thats an easy machining operation for an experienced shop. You WILL need to line-bore afterwards, but again, no real difficulty for the right shop.


ag1234
Arthur Gertz

(78 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: I want to use a crossbolted 4.0 block but only have small journal crankshaft.
Posted by: ag1234
Date: March 30, 2023 01:45PM

More direct is better. Use 4L. crank=simpler,stronger and easier to balance. Good Luck, Art.


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