Am I checking ptv clearance right?
Am I checking ptv clearance right? I hand ported my 243 heads, had them flowed and a valve job. I also had them milled .010. The machinist unshrouded my valves (wish he'd asked me first).
So here's what I'm trying to find out. I CC'd the heads and they're at roughly 64cc. The reason I wanted them milled was to boost compression by taking the chambers to 62cc, but since the valves are unshrouded I'm back where I started. If my logic here is flawed please tell me.
To get the compression I'm wanting to use a .041 headgasket, which in theory would get me back to my intended 62cc. Can I just clay the pistons, then lay the heads on the block without gaskets, then measure the clay and add in .041 to the equation to account for the gasket to get my ptv clearance?
So here's what I'm trying to find out. I CC'd the heads and they're at roughly 64cc. The reason I wanted them milled was to boost compression by taking the chambers to 62cc, but since the valves are unshrouded I'm back where I started. If my logic here is flawed please tell me.
To get the compression I'm wanting to use a .041 headgasket, which in theory would get me back to my intended 62cc. Can I just clay the pistons, then lay the heads on the block without gaskets, then measure the clay and add in .041 to the equation to account for the gasket to get my ptv clearance?
Decide what amount of clearance you think is safe then get a shim that thickness and put between the rocker tip and valve stem and turn the motor over by hand. Maybe do this without gasket. If it clears without gasket and shim then it should clear with gasket in place for sure.
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Don't forget to swap valve springs on the cylinder you're checking with some soft "checker springs" otherwise you're going to compress the plunger in your lifter and think you have way more clearance than you really do.
