I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2
4.380 x 4.500 is 542.4
4.500 x 4.250 is 540.7
4.440 x 4.375 is 541.9
Our 543 kit is a 4.500 stroke x 4.380" bore, which equals 542.43 cubic inches. We offer pistons for that kit in .060" over, so we usually rate the cubic inches at the largest available bore size. And we did round up by .57 hundredths of a cubic inch.
Which block do you recommend? Any consideration on the industrial 413,block ? What’s the minimum wall thickness? Do you offer an assembled short block ?
Most all blocks are the same and work great. If you haven't read it, check out our article on engine blocks here:
http://www.440source.com/blockinfo.htmWe've found the 413 industrial blocks to have very thick cylinder walls (over .400") so they usually support boring out to a 440 size. But you should always sonic check the specific block you are using, and make sure it has enough thickness. The factory "spec" for cylinder wall thickness is .250". We usually don't like to see less than .180" or so.
