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What type of piston?

Slug

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Hello, I have a 340 that machine shop just bored .40 over. At everyone's recommendations I had stock crank reground . Using stock rods, I have the new trick flow heads and am using a lunati 20200711 roller cam and lifter which has .515/.530" lift. How do I figure out what piston to order ? I want to have around 9.5 to 10 compression so I can use pump gas. I need help figuring out if I get a dish style piston or flat top piston that the valves will not interfere with. Thanks.
 

moparleo

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Either contact a Mopar familiar machine shop, the different piston manufacturers, the cam manufacturer and just give them the cm specs and bore/stroke. They can tell you the proper piston. Or most of the time the piston manufacturers catalog will give you the proper piston number.
I you are supposed to get the complete parts list done BEFORE you start the build. Not just get parts as you go.
 

Chryco Psycho

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The Speed Pro forged 10:1 piston should work well it has valve notches for clearance & the lift on your cam is very mild , the only downside is the weight , Ross or Diamond should have a lighter piston but you need to rebalance it .
 
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