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First off, no they are NOT heavy. They are the same as stock designed as a forged replacement drop in.
At 613 lift and 268 @050" the exhaust notch which is not the exact angle as the valve will clip the edge of the valve on a blueprinted engine. The fix is minor and requres laying back the angle of the valve relief to match the valve. Unless it is an aftermarket head engine it has no need of such lift. I dont go above .540 net lift with iron heads even ported ones. Tis a very good and effective set up these L2355F setup 440. I wrote the book on them .(Old Reliable) Power to the mid upper 500s is possible with a good cam choice. Dollar for Dollar a very hard build to beat. I have seen them chew some pretty expensive competition. In fact I have had the distinct pleasure of being the chewer. Don

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i guess my heads flowing into .600 are no good than at that lift.
let me add something worthwhile to the post.i did have my pistons cut deeper on the V reliefs .100 for the .590 cam and after running it found cabin buildup in the deep part of the cuts so i can say that laying back the cuts would reduce the buildup in my opinion.

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For you guys who've installed these pistons, how far down in the hole did you find they sit if installed without block decking? .02-.03?

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67 camaro with Peter Fedun SS record holding motor. videoed too. Their carb cost over $1000 for cryin out loud. But think what you want. It changes nothing. Did you ever try running a 4000Lb plus race car?
L2355Fs should be zero deck but are often .015 to .035 off that due to factory tolerences. Often side to side there is quite a difference. i have though had two that were within .002. Pretty rare though.
Don

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Why it matters, I do not know ...but yes, I have run a 4000 pound plus car, street car actually. I added 200# to my 3800# car just to see how much it slowed it down. It went 9.70 w/ an extra 200# in it. CHIP

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67 camaro with Peter Fedun SS record holding motor. videoed too. Their carb cost over $1000 for cryin out loud. But think what you want. It changes nothing. Did you ever try running a 4000Lb plus race car?
L2355Fs should be zero deck but are often .015 to .035 off that due to factory tolerences. Often side to side there is quite a difference. i have though had two that were within .002. Pretty rare though.
Don

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Sorry , it's not factory TOLERANCES , if you do the MATH to FACTORY blueprint specs , NOT NHRA , the 2355 is .021 BELOW the deck .

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Two different lines of thought. One comes from a drawing board and one off the assembly line. In reality if it was line bored, rod shortened, decked, or a few thou out in any direction it will not come out to exactly .021". Thats the reason he said the actual number could be from xx - xx. And you don't want to build it to .021 deck height, so I am not sure why that fact is relevant.