Z28M6TT

Just like the title says. Is a 2.120 flycutter too big for a 346? I have 2.02 valves and it seemed like the recommended radial clearance is .050 so that's why I ordered a 2.120, but now after reading some other threads I'm second guessing myself.....

I had a conversation with Brian Tooley and I could have sworn he said he uses the 2-1/8 (2.125) ISKY cutters with the flycutter setup he rents out, but I'm just looking for some confirmation.

I did ask this in another thread but I didn't get a clear-cut answer.

Thanks guys.

JakeFusion

iTrader: (7)

You'll be fine.

KCS

iTrader: (20)

Perfectly fine. Some aftermarket pistons have 2.20" diameter valve reliefs in the 3.9" bore

Z28M6TT

Thanks guys. That's some good news considering my Lindy cutters just came today. lol. Now I can get some work done this weekend.

JakeFusion

iTrader: (7)

When you called and talked to Dave Lindy, did you tell him your valve size? He builds the cutter based upon what valves you're running.

Z28M6TT

I told him the valve sizes and that I was looking for the .050 clearance. He said some people ask for different clearances but he didn't say anything along the lines of "I usually cut them for x amount of radial clearance". I figured if .050 was the recommended that's what I would go for.

Afterwards I just saw some threads of people (using bigger valves with sandpaper) saying 2.05 or 2.08 is the most they would cut because of danger of getting too close to the upper ring land.... Then again I'm only going to cut .050-.060 deep, and the Lindy cutter has that chamfered edge so I would doesn't really go that deep on the outer radius.

JPH

iTrader: (2)

Be carefull. You can cut right into the sleeve/block outter edge with a cutter that big.

Z28M6TT

Correct me if I'm wrong, but if your cutting at TDC you would have to break through the side of the piston and maybe even the bottom before you touched the wall, and at that point wouldn't the cutter not even fit in the head??

I will obviously take things VERY slow with the first piston or two though.

JPH

iTrader: (2)

Make DANG sure you are at TDC. I have seen it done.

Z28M6TT

Thanks, will do. I plan on keeping the degree wheel on during the cutting (especially when setting cutter depth) to make sure I'm at TDC on each piston.

Dare I ask where you saw someone cut through the wall?