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Fly cut it with your homemade valve but grease up the gap between the piston and cylinder. Piston is at top dead, vacuum and wipe the metal out then rotate the crank. The piston can only go down leaving the little grease protector up high to be wiped away. No metal will go past the top of the piston. As for dome thickness, you are cutting a circle cut on an angle, the area of thin material will be so small, if it is even that thin when done. It’s not like you are reducing the dome thickness by .100” for a complete 1.6” diameter area.

Use a 413 and solve the horse power/torque problem.

Blow the budget! It's a mopar

Put an rv/towing cam in it torque will come up and hp will be close to stock and fresh set of heads

I might not be the cheapest or the easiest but look like to me you would be the best overall to pull the engine apart have the block deck evenly on both sides and get new Pistons with valve reliefs that you want and put the new heads on there.

You hear that thermoquad in that purple charger

Nick are they edelbrock heads or have they been ported extensively?

Nick , How much did you cut the heads, and you just said there is a 20 thousands difference from piston to deck height, Nick you really should have decked the block, I know you’re trying to save money for the man but now you have, heads that are cut differently, I mean if the man is bothered by the hp to torque differents he should pay the difference, to do it right

Honestly Nick I would just open the engine up all the way. Mag the block and heads and then put new hardened seats in the original heads true out the heads and block true the cylinders rebalance the crank and reassemble. Oops and a multi angle valve job to the new seats. Honestly just rebuild the engine to better than stock but not a 1/4 miler. Great Video Thank You 🙏

8:56 how come you didn’t cut the seats out and install new ones i’ve had this done before on the LA 318 heads to 302 casting the seats were sunk. I had them cut out new ones installed broke my compression right back up where it belonged. I had a big block Chevy 327 tall deck, same thing sunken valve seats. Had them cut and installed. New seats did a fresh three angle valve job and they were meant. that was a stock 427, 425 horse when I got done and refreshed it with a new set of rings and rework the heads. The actual horsepower numbers were closer to 480 and it made just shy of 500 foot pounds. My point is cut them out prescience of new seats. The only drawback is if it’s not done properly they’re gonna mess up and fall out in the engine will be toast.

Geez that guy in the hat....just irks me and apparently Nick also, to no end. Way too many people talking, understand your knowledge, but respect me and my shop-dyno and knowledge

Yes you need at least .030 of radial clearance. .050 is best

Hey nick,You already know this but if you cut the valve relief .090 in to that piston ,it could compromise the integrity of the crown of it. It is a forged piston though . Then you also have the issue when you plane the one head a little , the intake needs to be cut also. .010 isn"t much but both heads were already planed .020. I know you will do the right thing while keeping your customers budget in mind.

451 that car.

Georgie you are knocking it out of the park with these aerial camera shots. Man you get such a great shot of all the cars and the whole shop. Really shows how busy that place is man oh man. God Bless everyone at Nick's Garage

Fly cut the existing pistons, install new seats on the 906 heads with new valves.

Could the problem of sunken valves be fixed with new oversized valves? I’m just curious because I don’t know.

The big question is who's paying for it and what does the customer want?

We used to buy flycutters and cut the pistons in place without issues. This was before aftermarket slugs were readily available. I would installl new seats in the 906 heads, do a little pocket porting, clean up the head intake and exhaust ports. You may want to advance the cam timing to get more HP at a bit lower rpm... more power for daily driving.

I’m invested now, I must know what happens!

the fly cutter made out of a valve is a great idea !!! but! i dont think i would try it on a good numbers matching engine unless your costumer says " why not give it a try"

You know what you are doing. And thank you for doing so much work on your dime. I'm excited to see the end results!! All you said is right!!

Hi Nick, I have had a customer turn off the motor out front of my workshop, then go to leave and the motor would NOT turn over..The Milodon Gear drive loosened away from the camshaft, and all the valves were left open..NO engine damage. Could that have happened with the valve ? The engine was turned off and the valve was fatigued and ready to break...They are 2 piece valves, from manufacture, !!. So the Engine wouldn't turn over, so they pulled the pan to investigate, and it had the spun bearing fell in the pan, by accident.. ??..Could the wrong pistons have been put in it at the Factory when it was assembled..Did they make Truck engines with the good rods but low compression pistons ?

Yikes! Thanks for posting this George God Bless everyone at Nick's Garage.

Great to see Nick enjoying life and talking shop…. 😎

413 Max Wedge engines are the same way if they have sunken valves!

Just a thought if you are looking for factory HP & torque #. Put all factory replacement spec parts back in it. I also have a question can you install new hardened valve seats in the original heads?

Do you degree your cams when you build an engine? What are the differences between the 906 and 946 heads? My 440 had the 906 castings. Which heads are better? Someone told me the 915 heads were really good, too.

You do a great work i see Joe from Ohio

I have cut valve reliefs by welding pieces of file to old valves ( intake and exhaust ) and shaping / sharpening the file material, I made them slightly larger than the valves I intended to use for side clearance, worked perfectly looked correct and checked clearance using modeling clay , several engines with these mods still running 30 years later .

You're the man Nick. You have all kinds of knowledge Nick I would love to know half of that.

It's been years I watched the car wizard channel, but he's been on the camshaft problem as well. His take was that the remaining factories for lifters produce with crap metallurgy.

You should change the name to Ole-Nicky.

What about dialing the cam in it won't make the right power without it

Leo clicking his seat belt, gave me an instant flashback to the beginning of the Bullett chase scene.

What ever you eventually do, I will be watching with great interest. In a world where most 383 cars have had the engine yanked and trashed for a 440, or a 400 stroker, I am still faithful to the basic 383, and want to see it stand proud as a legit muscle car engine.

well your client was making the first decision i would hope he would split the cost with you your working your butt off to figure it out. looking forward to eps 4 and 5 on old weaky lol. that has to be tough to take

My guess is that you are correct about the black rod color indicating a spun rod bearing. They caught it just as it started squeeling,the removed the rods and pistons and replaced them with another set with 90 thousands shorter rods , like for a big truck, twin screw grain truck with a 440 ? Just my thoughts Nick

You’re a good man, Nick.

I've done things and gone the extra mile for a few of my customers too. When you own a shop, there's just some things I don't feel right about charging for.

Nick, just have hardened seats installed in the original heads, and that will solve the sunken valve problem. Just make sure the new seats are installed to a depth that allows proper clearance with the cam selected. Your client needs hardened seats anyway due to today's unleaded fuel.

I think Crower used to make valves with a cutter ground in. I have also seen a slot milled in the valve and a cutter silver soldered in.

What would I do? I would sell it and buy a bigger boat.

Wouldn't notching the piston make it rock as it changes direction because of the weight removal on one side?

Didn't someone else build the motor? If so, then the HP it's got is the HP they get, unless they are willing to go the distance and have it done right. But I get it. Nick is trying to help.

I’d install new pistons and be done with it.

I would like you to rebuild and work an old 361 DeSoto engine. Nick, bottom line it's just a matter of not doing a half ass job!! Your reputation as a builder is everything!!! Great video😊😊!! The 383 was Mo par's bread and butter !!!!

Diamond pistons should have what you want. For my 383 block I bought forged +.030 pistons with valve reliefs with 1/16 ring grooves. Childs rings. I talked with Diamond a couple times. They will make what ever you need.

Good on you Leo...