SVT Pistons

[merc]

I need to understand the differance between these two Ford SVT part numbers

2REV6110-A1
GRADE 3

2R3V-6110-EA
GRADE 2

[Zack]

Please tell me you are not putting 8.5:1 pistons in your good engine build up!

[merc]

Please tell me you are not putting 8.5:1 pistons in your good engine build up!

Nope, but I was wondering why thier was two part numbers used. What was the Diamond part number you used on Cruztaker's block.

[sicilianmarquis]

ones prolley for the cobra, the cobra is the 8.5 comp ration and forged, the marauder is hypertonic pistons

[MarauderTJA]

Spend the money and get CP Pistons...

[merc]

Spend the money and get CP Pistons...

Ok, what's the part number.

[MarauderTJA]

Ok, what's the part number.

I am presently on the road in Alabama. When I get home on Friday night I'll look at my parts slip and get it to you. In the meantime I'll try and get it for you from my engine builder, AL Papitto @ Boss 330 Racing earlier if possible.

[merc]

I am presently on the road in Alabama. When I get home on Friday night I'll look at my parts slip and get it to you. In the meantime I'll try and get it for you from my engine builder, AL Papitto @ Boss 330 Racing earlier if possible.

I might be looking at stock bore size or .20.

[MarauderTJA]

I might be looking at stock bore size or .20.

10-4. I'll find out what he used on my motor. I know my compression is 9.3 to 1 due to the boost I am running. I know that all he uses on his built motors are CP Pistons.

[merc]

I found my answer on Modular Depot

Bore grades
The block is pin stamped on the front with the bore grades.... The pistons will also have the bore grade identified on the top. They used to paint the side of the block with each bore grade size (blue, yellow and pink), but that practice went out many years ago (like 1996 timeframe)..... In order to read the pin stamps you need to have the front cover off.

The pistons will be identified on top, but after running in an engine a while, you probably won't be able to make out the part numbers that are ink stamped on them. The typically use a suffix bump like 1L2E-6110-AA, or -BA, or -CA. There are usually on three size classifications, ranging in size from 90.200 to 90.239 mm.

I've opened up several engines recently where the bore grades are actually pin stamped in the tops of the pistons.... But '01 Steed is correct, in the 2000 timeframe the pistons were ink jetted with the bore grades and after running the carbon build-up would make reading the ink jet impossible... Front of the block is the only sure way once that happens.

The pinstamps are made by physically stabbing the block with carbide pins and making shapes (1,2,3) in the front face of the block (kind of like "tattoo-ing the block" for lack of a better description)... They use cameras to read these numbers on the assembly line to automatically select the piston for each bore in each block... There are also numbers stamped in for the crank bore journal sizes. These are used to select fit the main bearings as well (just like the pistons). The 8 numbers in a row are the 8 bore grades (in order 1-8) and the 5 numbers in a row are for the five crank journals....

The color codes are probably left over in the spec sheets from when they used to paint the sides on the block (they call it red, blue and yellow, I referred to it as pink blue and yellow but it's the same thing, it just looks more pink than red to me). The paint marks were put on the block in the hone to identify the bore sizes, problem was the block was covered in honing oil and most of the paint ran down the side of the block and got washed off in the final washer. When the blocks went to the main line they would not have any paint left on them and they would have to shut down the line and hand gage each bore, thus the changeover to pinstamps to alleviate this issue.... When the line goes down it's losing big bux each minute so the pinstamps were a big efficiency gain in mass production.... Sorry for the long post, it's a long and tortured story...

The cylinder bores were/are predominantly bore grade 2's, you can have 1's and 3's in the same block as well though.... They target 2's (95+% of all bores made) so if they go a little oversize you get 3's rather than scrap... Bore grade 1's are pretty rare but they did actually target all bore grade 1 blocks for short periods of time in order to be able to run bore grade 1 pistons on the assembly line. The block manufacturing line had better size capability than the piston manufacturer so in order to use up what the piston manufacturers were supplying they did do short runs targeted to bore grade 1's.... As for the cranks, you can also have different main and pin diameter grades on one crank... Select fit means each bore, main and pin are gaged and pistons and bearings are based on the size of the incoming parts.... You're talking about a 15 micron (little over .0005") difference between grade sizes (at least on the bores) but they can be different.... Welcome to the wonderful world of Modulars :-)

[Stranger in the Black Sedan]

Wow those are some crazy factoids.