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Originally Posted by XcYZ
It's not uncommon to see stock block 434 and 440 SBC's in dirt racing, but the blocks are partially filled with Hard BloK or something similar. As Tom said, you really get into the rails, lots of clearancing.
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That makes sense with the short rod length to stroke ratio; alot of pressure on the cylinder walls. Hard blok is not a route I want to go since I will drive this thing on the street.
Ok but I am confused on the clearancing issue. Dart, World, and others stuff 4" cranks in their blocks. They make thier blocks w/ raised cams and thicker pan rails OK given, but they still use stock deck height am I right? I would think rod ratio and piston pin clearance would be an issue for them.
How are they or their customers getting around that?
Mal