23-05-2018, 08:58 AM
Re the core plugs please note what Bystander said. I would judge whether it's needed or not based on the condition of the bits you can see.
If running a 2 bearing crank general practice is to allow say 20 thou gap between piston crown and the top face of the block at tdc, stops pistons hitting the head at high rpm. With a 3- bearing crank you can cut it a bit finer. If things are a bit tight you can normally skim 10 or 20 thou off the piston crowns to make the clearance. It is also possible to put a spacer under the block, but you don't want anything interfering with the base of the piston skirts. All I'm saying really is do some measuring (or trial assembly) & understand what you're in for before taking metal off - you can't easily put it back on!
If running a 2 bearing crank general practice is to allow say 20 thou gap between piston crown and the top face of the block at tdc, stops pistons hitting the head at high rpm. With a 3- bearing crank you can cut it a bit finer. If things are a bit tight you can normally skim 10 or 20 thou off the piston crowns to make the clearance. It is also possible to put a spacer under the block, but you don't want anything interfering with the base of the piston skirts. All I'm saying really is do some measuring (or trial assembly) & understand what you're in for before taking metal off - you can't easily put it back on!