Pistons?

Couple of options. Just going through this right now with my build. What I found is:

Speed Pro 2482 is the old-school TRW "flat top" forging with the four small valve reliefs that look like a HiPo.....I think they are 2.7cc volume total. These run the typical older 5/64 5/64 3/16" fat ring package, and 1.605" compression height. Generally speaking, that compression height and a 5.155" 289 rod puts the top of the piston close to zero deck, which will maintain compression near the original 10:1 intent. Note that a lot of replacement pistons called out for 289s these days run a 1.585" compression height, which will result in the piston down in the hole pretty far, and sap a lot of compression away. If that's important to you, and it sounds like it is, you have to keep an eye on that. Link to Summit for these pistons:
https://www.summitracing.com/parts/slp-l2482f30

The other option, which is what I am using, is a "Summit" branded 4032 forging with 3cc eyebrows. These are make by RaceTec out in California, which was the former owner of JE pistons, and are a very quality piece. They are 1.605 compression height, lighter than the old 2482s, and most importantly to me, run a modern 1.5 1.5 3.0mm ring package. I won't go into why I like that, but the difference is real. They are pricier, but I only plan on building my K engine once.....I hope! Here's a link to those:
https://www.summitracing.com/parts/SUM-SBF302030F

Hope that helps.

Kevin

Are you running 5.155 or 5.090 rods?

Same question for rods. What is the best way to replace C3AE 3/8?

I'm not sure on the rod length the original poster.

But I am running 5.155 K service (Boss 302) rods. One thing I did not mention above is that to run the 1.605" compression height piston, the deck of the block will need to be untouched previously, or not much taken off of it. For example, with an 8.200" untouched deck, the 5.155" rod plus a 2.87" stroke puts the 1.605" compression height piston 0.005" down in the hole. That leaves exactly 0.005" of meat there for a "clean up" pass and then arrive at zero deck. Regardless, this all needs to be checked very carefully in the mock-up phase of the build.

Kevin

According with Gemini AI, An untouched block is 8.206’’.

and what about the gasket?

Unfortunately my block was surfaced .0035’’. So now it is 8.2025
To have a 0.00 deck, in my configuration, I need 1.6125 CH pistons.

Yep, I forgot....8.206. If you had a .0035 clean up pass done to that, you're still in good shape. If I were you, and wanted to have "zero deck", then I'd run the 1.605" compression height pistons and cut the block some more to get there. I'd mock it up and check and see what the actual deck clearance is at TDC. Then cut accordingly. Personally, I don't mind the piston down in the hole a tiny bit, to always allow for a future deck clean up if necessary.

Very common gasket thickness is 0.041"

I ´m agree with you.

Thanks for your messages.

8cc head volume is too much to obtain the 10,5:1compression value. Or as you say, heads and block need to be machined and you have to choose a super thin head gasket.

Here an other way with 2.70 cc head volume. https://www.summitracing.com/parts/slp-l2482f30

This set seems to be the good one for my project: forged, 4cc head volume, clip, 5.155 rods length, strock 2.87.
https://www.summitracing.com/parts/dms-1-3500-4030d#overview

Quote from Math

This set seems to be the good one for my project: forged, 4cc head volume, clip, 5.155 rods length, strock 2.87.
https://www.summitracing.com/parts/dms-1-3500-4030d#overview

That looks like a nice setup!