yea i was looking at the 2.8 pistons too. i need to redo some calculations as the deck height i was using was wrong so that changes things considerably. The only worry i have with running flattops is keeping the compression to usable levels. zero decked with only 43cc combustion chambers might run it up a little high with flattops. im still in the research phase but im having fun, and this is going to help me when i go to build by 292. Im also waiting to get a big end width measurement so i can keep that in mind too.

Maybe a 2.8L piston will work. Same bore, same wrist pin but it is a flat-top. Pin ht. is 1.511 instead of 1.527". Rings are a little funky at 2.0 2.5 4.0mm.

2.9L rings are 1.6 1.75 3.5mm

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

yea i did it several times but there must be a misprint or something and its suppose to be .030. surely the dish is not over a quarter of an inch deep. heck my heads only have a 43cc chamber the piston cant have half that big of a dish. That and if i plug that into the compression it gives me like 7.somthing to 1 compression at zero deck so that cant be right. not sure might just have to call them and check.

Your math for the dish looks correct as I get the same 22.6 cc’s.

Lorena, Texas (South of Waco)

ok thanks for that link that helps me out a bunch turns out i was adding everything up. Also thanks for the reassurance on the rods. So far i think with a little bit of tweaking i might be able to pull this off i just have to calculate my compression ratio as im a little worried its gunna be really high. The way my math is working i can use a 2.9l piston and a 5.850 rod with 2.000 journals and if i ream the rods and take about .013 of the top of the pistons and .008 off the deck just to clean it up ill end up with right at zero deck. The pistons are dished so that might help with the compression. Now i need to see if im calculating the dish correctly. The silvolite website lists them as having a 2.42X.300 recess. Now pi*r^2*.3 to give me the volume gives me 1.37988 cubic inches. Now converting to cc give me 1.37988*16.387 which would give me 22.6cc dish. Now i don't think this could be right. that seems like a huge dish and it would drop my compression to below standard 2.9l levels. What am i doing wrong here.

Here’s a link to a past thread covering the deck height calculations.

http://www.y-blocksforever.com/forums/Topic8010-3-1.aspx

Lorena, Texas (South of Waco)

I don't think that would be a problem.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

So i have another question now. Would it generally be safe to take a aftermarket rod with .927 wrist pin hole and ream it to take a .945 wrist pin. That would be a total of .018 which isn't really a whole lot only .009 all the way around. Do most aftermarket rods like scat and eagle have enough meat in the pin end to do this. Keeping in mind this is NOT a 700 horse race motor more like 200 or a little over. If so i might just be able to make this work if im adding all this up right.

The 4.0 would be cheeper but when I had a 2.9 in my Ranger I always wanted to experiment with different bore/stroke combos so I can see what you are getting at. Have fun, but when you get frustrated buy the 4.0  .

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

By the time you find the correct length rod's or pistons,(and pay for them) the 4.0 will be a WHOLE lot cheaper and easier.

Frank/Rebop

Bristol, In ( by Elkhart)