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Thats the thing about seat of the pants. Its not consistent, and its not factual. Not to try and discount what Hank said, but without a real back to back dyno its impossible to know truthfully the differences.

I digress..... the cup size matters to a point. I didn't mean to say to use the smallest cup you can. However, going too large WILL have adverse effects. You have to keep the cups functional... the bigger you go, the less functional they become, so there is a fine line. I searched around...

This is just an observation, obviously I don't have a DD.... but you guys seem to be focused on the pre-cups way too much. International made the cups bigger to reduce emissions.... All the pre-cup is responsible for is the first 20-30% of your burn, and helping to atomize the fuel. The...

I have quite a few videos of the truck. This is the most recent before I had all the body work done and painted: http://youtu.be/kA9bTciAt_M?hd=1

and these are 7.3 IDI pistons:

these are mine: 3-angle valve grind plus a 2* interference. Cups were shaved with the heads, opening the mouth a little bit. these are the pistons, mine are shaved .080"

6.9 was 22.5:1, the 7.3 was 21.5:1 6.9 had two different pre-cups, but the later is an 18cc cup, the 7.3 uses a 20cc cup. 7.3 injectors are .060" further out of the heads. The 7.3 changes were for emissions purposes.

thanks guys

Used to be about a year ago.

My last dyno was 292/614. I run a ZF5 and 4.10 dually rear. Coast down was 29% I know it sucks they gave me the dyno sheet with MPH but I didn't notice, and didn't care much. 60mph is 2,200, 70mph is about 2500. I currently am running a box stock JD/CAT BW 61/65/.80 T3 w/ locked...

I'm sure some of you recognize my screen name, I recognize a few here, and I've seen my name pop up before, and recently got a PM on another site seeing if I would come over because it was hard to keep up with my posts otherwise, so here I am. For those who don't know, I have a '92 F350 with...

its interesting to me that these make such decent HP, but such low peak torque. Any idea why?