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99,99% does without and it goes fine. When you have some time left you could torque only a head on the engineblock and measure the bores from the cranckshaft side and see the cylinders are marginally oval now. Nothing to worry.
Jeroen
Do you have any thoughts on piston to bore clearance. Book says 1 thou for a standard engine. But this will be making circa 190bhp. Should i increase it do you think?
Unless you are going drag racing or drifting, the standard 1thou should be ok. Horsepower is less of a controlling factor than operational heat range, if it's gonna get properly hot from competion use, might be worth adding another thou. I recently watched an American guy building a V8 Mopar engine for dragstrip work and he built it quite deliberately with around 5thou of slop in the pistons, far too much for a road car but necessary for that application. (Uncle Tony's Garage on Youtube a real down-home, low budget car builder, great fun watching his low cost, low tech cars going far quicker than they have any right to, yes, and sometimes blowing up!)
Steve
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