Newbie 318 piston question

Dartswinger70 said

I believe it applies only at high rpm no? like that's where the airflow in the cylinders would be effected. i bring this up because with the 340 heads 6000 rpm was the goal to be met. they had an advertisement for the 340 Swinger in 69 and 70 that read 6000 rpm all day for $2800 its a quick throttle response RPMs up quick plenty of torque and HP throughout up past 500-5500 RPM. that was 340 i think when building a 318 this has top be acknowledged that's why the big valve heads and shrouding come up in a serious conversation I would think at the least there would be turbulence at high RPM disrupting the airflow etc. Im guessing in a 318 well below 6000 RPM

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You truely do not know what you are talking about. If you build a 318 using all the 340 parts, heads intake carb exhaust cam valve springs, it will run just like a 340. You should actually do something, rather than theoretically throw nonsense out there. I used to take a 318 and add 360 heads, used 340 intake, carb, windage tray, high pressure oil pump spring, 340 valve springs, a good cam, and a 340 double roller timing set. It was all cheap and they would run just like a 340. You did not even need 2.02 intake valves, 1.88 were good enough. As a matter of fact the same formula worked on Chevrolet, Ford, or any other brand engine. Find the good flowing heads and put them on any size Chevrolet add a cam and go. I built a lot of 289's and 302's with 351 Windsor heads and stainless steel Chevy valves. What a sweet combination that was. You start with good heads and go from there.