[cobrashoch]

Toivo- Siamesed blocks are ok to use on the street but they must be used on a case by case basis. The chevy blocks(bowtie block)
problem is the physical lenth of the block is to short to accomidate those 4 and 1/8 th bores without squeesing them together. This is not the case on big blocks. The best BB block for that is the Mopar peice that has around 1/8 th inch common walls at 4 and 1/2 inch bores. The Ford 460 stock water block was designed for 4 and 1/2 inch bores(block lenth) so I wouldn't be afraid to use the SVT block either. Same for the Chevy BB to. Plenty for short use street trips of 200 or 300 miles or so. They all have the common problem of having a hotspot on the common walls at the head surface so the smart thing to do there is to keep the compression ratios down. That's the way most guys are building them anyway so it's not a problem usially. Fords street siamesed small block was a Australian Cleveland block that was used on production cars with no problems I am told. (it must have been heavy) So I would sonic check any block first before any build. I have seen bowtie SB blocks that had so much core shift that I could not parallel bore them off the deck plate to square them up, the results would be to thin! So at least in my experience anyway the Chevy small blocks are the exception and NOT the rule, and siamesed blocks will work on the street. But you must use your head about it to. High compression mega horsepower engines don't work long on the street with standard blocks usially. A siamesed block is just another factor in that equation.
cobrashock