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Search found 1329 matches

by CNC-Dude
Sat Apr 13, 2019 3:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EDIS-6, how does/did you attach your 36-1
Replies: 7
Views: 197

Re: EDIS-6, how does/did you attach your 36-1

Most people mount them on the backside of the damper on the OD of the seal surface. You may need to chuck it in a lathe to extend the machined surface past the outside area between the timing cover and rear of damper/balancer. A snug press fit is all that's needed, and since it's on the rear of the ...
by CNC-Dude
Sun Apr 07, 2019 10:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 45
Views: 1238

Re: Has anyone ever built something like this?

Roller cam blanks and main hurdles are at the top of my list of what a few guys are wanting me to make for them.
by CNC-Dude
Sun Apr 07, 2019 9:38 am
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 45
Views: 1238

Re: Has anyone ever built something like this?

There have been several 3.7 Mercruisers built in Comp Eliminator drag classes that used 4.600" bores and larger. But they are based on the 460 engines, so that's not really difficult for them. I have two of these engines that I'm doing some prototype race parts development for currently.
by CNC-Dude
Fri Apr 05, 2019 4:26 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Moly vs. Plasma-Moly Rings
Replies: 7
Views: 220

Re: Moly vs. Plasma-Moly Rings

Matthew68 wrote:Thanks, guys. So - what I’m getting out of this is essentially they are the same thing.

Thanks

It simply is describing the method the moly was applied to the ring.
by CNC-Dude
Thu Apr 04, 2019 7:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up my block and pistons from machine shop.
Replies: 22
Views: 732

Re: Picked up my block and pistons from machine shop.

And if the piston weights are as close as you mentioned, I wouldn't worry about those either. The factory pistons from 25-30 years ago weren't matched that closely and lasted 150,000 to 200,000 miles just fine.
by CNC-Dude
Thu Apr 04, 2019 7:59 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up my block and pistons from machine shop.
Replies: 22
Views: 732

Re: Picked up my block and pistons from machine shop.

You have to be careful with what you use to remove the material from the pistons and where you remove it. Especially with cast pistons. You need to use a rounded tip carbide burr, and grind in the area below the pin bosses where the material is the thickest. Without seeing the pistons, it's hard to ...
by CNC-Dude
Wed Apr 03, 2019 10:19 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up my block and pistons from machine shop.
Replies: 22
Views: 732

Re: Picked up my block and pistons from machine shop.

If the pistons have a chamfer around the deck edge of them, you'll have to take that into consideration as well for compression sake.
by CNC-Dude
Fri Mar 29, 2019 10:26 pm
Forum: 144-250 "Small Block" Six Performance
Topic: 1.5" exhaust values?
Replies: 8
Views: 241

Re: 1.5" exhaust values?

We're all human and do it from time to time. LOL
by CNC-Dude
Fri Mar 29, 2019 6:48 pm
Forum: 144-250 "Small Block" Six Performance
Topic: 1.5" exhaust values?
Replies: 8
Views: 241

Re: 1.5" exhaust values?

I just made a new one, it's also a t-shirt i made as well. I'll find a link for it if you're interested. Thanks
by CNC-Dude
Fri Mar 29, 2019 4:41 pm
Forum: 144-250 "Small Block" Six Performance
Topic: 1.5" exhaust values?
Replies: 8
Views: 241

Re: 1.5" exhaust values?

Actually, 1.380" to 1.500" is just shy of an 1/8", or .120" which would be .060" per side. Also the bowl area will need to be enlarged as well for the larger valve or you won't really gain much even with going to the larger valves.
by CNC-Dude
Sun Mar 24, 2019 6:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Stuck valve locks
Replies: 53
Views: 909

Re: Stuck valve locks

I've done close to 1000 sets of heads, just never have worn out my original K-line set of tools at the race shop I worked at. LOL
Also, I doubt you'll be able to prove its better with or without it being done!
by CNC-Dude
Sun Mar 24, 2019 5:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Stuck valve locks
Replies: 53
Views: 909

Re: Stuck valve locks

Sounds like a step was overlooked in the guide liner installation. Once the parent guide is drilled and reamed, there is a special spiraling tool that is run down the parent guide and cuts a thread looking cut the whole length of the inside on the parent guide. This gives the liner a crevice to bite...
by CNC-Dude
Fri Mar 22, 2019 9:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Yet another thread about Chevy rockers.
Replies: 25
Views: 861

Re: Yet another thread about Chevy rockers.

The studs you are describing also do not compensate for wear over the years, so it might be a good time to upgrade to the adjustable rocker studs. Not all the lifters, rockers or cam lobes wear at the same rate, or at the same amount. So it's always best to have full adjustment to allow for these in...
by CNC-Dude
Wed Mar 20, 2019 4:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 435
Views: 41276

Re: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress

I'm sorry if I missed it but a short production run of a cut and welded LS based head after the Sr is done is still being planned, right? Does anyone have any real world reliability info (preferably Bonneville or something else where you're wide open for minutes at a time) on sectioned and welded s...
by CNC-Dude
Wed Mar 20, 2019 9:54 am
Forum: 240-300 "Big Block" Six Performance
Topic: crower rod catalog
Replies: 3
Views: 218

Re: crower rod catalog

They should be avoided for anything but stock rebuilds. The slant 6 has rods that are similar and have had failures well below the 300 HP mark. Use at your own risk.
by CNC-Dude
Sun Mar 17, 2019 7:13 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Torque plates for small block?
Replies: 17
Views: 461

Re: Torque plates for small block?

Yep! That's the one X, glad you remembered it. Shows you were paying attention. I'll see if I can find another hosting site and put it back up.
by CNC-Dude
Sat Mar 16, 2019 6:21 pm
Forum: 144-250 "Small Block" Six Performance
Topic: freeze plugs
Replies: 17
Views: 406

Re: freeze plugs

There is one in the back of the head, not sure if there is one in the bellhousing area or not in your application. You need to use sealer on them, clean out the freeze plug bore first before reinstalling them. It's much easier with the engine out or at least pulled loose from the mounts to gain acce...
by CNC-Dude
Sat Mar 16, 2019 10:42 am
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

GM and Chrysler used steel cranks in far more of their engines than Ford did. It could have been that the Ford engineers were more realistic in what they felt really required a steel crank. Throughout the history of Ford performance, you never really hear any complaints about people having failures ...
by CNC-Dude
Tue Mar 12, 2019 3:20 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Torque plates for small block?
Replies: 17
Views: 461

Re: Torque plates for small block?

It was just a pic in my signature, nothing special. Hosted by imageshack before they hijacked everyone's pictures.
by CNC-Dude
Tue Mar 12, 2019 2:06 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Torque plates for small block?
Replies: 17
Views: 461

Re: Torque plates for small block?

I asked some time back about the interest in me making some torque plates for these engines, but mostly were undecided. However, a torque plate makes a big difference in simulating the distortion of the cylinder head whether it's a stock rebuild or for racing.
by CNC-Dude
Mon Mar 11, 2019 11:54 am
Forum: 240-300 "Big Block" Six Performance
Topic: C5AE rods
Replies: 40
Views: 981

Re: C5AE rods

Many of the companies such as Crower and Carillo and most others have their own proprietary processes and material they use for their connecting rods, and treat those intellectual properties as "trade secrets", so finding much details about this may be very difficult to obtain. And you mig...
by CNC-Dude
Sun Mar 10, 2019 9:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

As another option, Molnar/K1 Technologies also makes H-beam rods for both the Chevy 250/292 inline 6 and the Chrysler Slant 6 pretty inexpensively, so they are open to doing products for inlines without a doubt. As for the forging dies, the biggest piece of the puzzle isn't the dies themselves, but ...
by CNC-Dude
Sun Mar 10, 2019 8:58 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

I hope you're not expecting these "new cylinder heads" to be anything close to what was achieved by all out ported race production cylinder heads that were raced decades ago. Yes, these "new heads " will be an improvement, but nowhere near being able to produce the flow numbers a...
by CNC-Dude
Sun Mar 10, 2019 12:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

Moldex and Scat are about the same price as well. Until there is a cylinder head capable of allowing the 300 to make horsepower in a range that a billet or even a forged crank is necessary, there is really no concern as to whether a cast crank is more than adequate to fill the bill for any builds, N...
by CNC-Dude
Sun Mar 10, 2019 10:30 am
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

is it like stupid crazy expensive to get forgings made.? are there molds hidden somewhere in detroit ? Factory forged cranks are grossly over rated, and youll likely never be able to obtain a power level with a production cylinder head to warrant using one. It'll cost much more than they will benef...
by CNC-Dude
Fri Mar 08, 2019 6:26 pm
Forum: Buy, Sell, or Trade - Small Six
Topic: 69DE-M Large Log Cylinder Head
Replies: 7
Views: 733

Re: 69DE-M Large Log Cylinder Head

Do you still have this?
Thanks
by CNC-Dude
Thu Mar 07, 2019 11:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 981

Re: Industrial 300 forged cranks?

Just for some general info, there are several guys on the Inliners forum that are making over 1000 HP with boost on the 292 Chevy engines using cast cranks that have never had any issues, and have raced the same cranks for several seasons pretty regularly. In our Modified Production drag car we alwa...
by CNC-Dude
Mon Feb 18, 2019 9:52 am
Forum: 240-300 "Big Block" Six Performance
Topic: Rear main bearings
Replies: 6
Views: 486

Re: Rear main bearings

I've seen a lot of people build a Ford V8 for the first time and do the same thing. It's very common.
by CNC-Dude
Sat Feb 09, 2019 7:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

Yes, would you prefer aluminum or steel?
by CNC-Dude
Fri Feb 08, 2019 2:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

Yeah, that was a bargain!
by CNC-Dude
Thu Feb 07, 2019 11:39 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

I would much rather make them out of aluminum for many reasons. As for the flatness tolerance, the variance between the height of the bolt bosses is fairly wide, so as long as you are closer than that you'll be fine. That's kind of what I figured I just wanted to be sure there wasn't some other req...
by CNC-Dude
Thu Feb 07, 2019 8:54 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

I would much rather make them out of aluminum for many reasons. As for the flatness tolerance, the variance between the height of the bolt bosses is fairly wide, so as long as you are closer than that you'll be fine.
by CNC-Dude
Wed Feb 06, 2019 11:39 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

The engineers that have spent 10's of thousands of dollars developing them will disagree with you. Aluminum compresses more and cushions the clamping effect when torqued compared the a steel or iron torque plate. If there were no difference, they would have stopped making the steel or iron torque pl...
by CNC-Dude
Wed Feb 06, 2019 9:48 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

I made one and let a friend that was local use it. He kept it forever and then sold it on Craigslist because he thought I had given it to him to keep. He did pay me for it once I questioned him about it, but I haven't made any more.
by CNC-Dude
Wed Feb 06, 2019 8:16 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 torque plate.....
Replies: 20
Views: 1563

Re: Ford 240/300 torque plate.....

Aluminum torque plates were/are developed for use with an aluminum head. If you use an iron torque plate to hone your block and install an aluminum head or vice versa, you just wasted your money buying it, having it shipped and paying the machine shop to use it because they each stress the cylinders...
by CNC-Dude
Mon Feb 04, 2019 7:29 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Is it possible to put a roller cam in a small block six?
Replies: 15
Views: 592

Re: Is it possible to put a roller cam in a small block six?

There was a build on here 6 or 7 years ago by a member mike1157 that fitted an Oz Crossflow head on a 250 block with a turbo and put a roller cam in it. So it has been done, but it's expensive.
by CNC-Dude
Wed Jan 30, 2019 7:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: How much should machine work cost?
Replies: 14
Views: 558

Re: How much should machine work cost?

Rods reconditioned.....
by CNC-Dude
Wed Jan 30, 2019 6:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: harmonic balancers, are they absolutely necessary?
Replies: 14
Views: 569

Re: harmonic balancers, are they absolutely necessary?

THE FRENCHTOWN FLYER wrote:Good reply CNC Dude. But when you pointed out that the BMW cranks had very little bearing overlap did you mean to say the rod throw bearing journals had a lot of overlap with the mains? More overlap = a stiffer crank.

Yes, should have said a LOT of overlap! Thanks for the correction.
by CNC-Dude
Wed Jan 30, 2019 5:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: harmonic balancers, are they absolutely necessary?
Replies: 14
Views: 569

Re: harmonic balancers, are they absolutely necessary?

yes i read that, but i also read that a 0 gram balance and forged internals can mitigate the torsional twisting. Not always! so,,, im going to look into this further and find more than wiki offers. but if its true that modern engines and flat plane cranks don't use a balancer or damper, then if set...
by CNC-Dude
Sun Jan 27, 2019 9:30 am
Forum: 240-300 "Big Block" Six Performance
Topic: Chevy 250 i6 Rockers (my first post here)
Replies: 15
Views: 2323

Re: Chevy 250 i6 Rockers (my first post here)

Yes, all stock ratio BBC rockers are 1.7 ratio. As FTF mentioned, the stock ratio for all the Chevy 6 engines is 1.76.
by CNC-Dude
Fri Jan 25, 2019 5:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft prep before machine shop.
Replies: 6
Views: 679

Re: Crankshaft prep before machine shop.

I'd leave it stock stoke, you will only be lightening your wallet for no amount of gain you'll ever be able to measure or notice.
by CNC-Dude
Sat Jan 19, 2019 9:19 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1090

Re: misaligned block cam journal

Yes, it's called "thermal expansion. You also need to let all the components involved acclimate to the same temperature in the same room, including micrometers, dial bore gauges and engine parts. That really makes a difference, and 10 degrees can make a big difference, especially when you are m...
by CNC-Dude
Wed Jan 09, 2019 9:14 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Crossflow 250 Head Swap
Replies: 19
Views: 590

Re: Crossflow 250 Head Swap

It really doesnt look like its uber difficult. Not easy but it definitely looks like something anyone whose a little daring could do. Anyone know what shipping is roughly from Australia for that head? This is something I'd definitely consider. I've purchased several Crossflow heads before from Oz. ...
by CNC-Dude
Wed Dec 26, 2018 6:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 3.50 bore 3.100 stroke?
Replies: 5
Views: 380

Re: 3.50 bore 3.100 stroke?

May sure you can fit the rod in to cylinder at 3.500". When we first used aluminum rods in our Chevy 292 6 cylinder, the only forging that were available then were 426 Hemi blanks, and we had to machine the sides of the rods before they would go into the bores. Double check how wide the 240 rod...
by CNC-Dude
Sat Dec 01, 2018 8:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Aftermarket 300 Rod opinions?
Replies: 27
Views: 1293

Re: Aftermarket 300 Rod opinions?

The 240/300 is already available with .912" wrist pins the same as the SBF's, so the aftermarket piston companies also already have them available in that size as well. But a near stock drop-in rod that fits the stock crank journal sizes would be the most common so off the shelf parts could be ...
by CNC-Dude
Tue Nov 27, 2018 4:58 pm
Forum: 240-300 "Big Block" Six Performance
Topic: CONNECTING ROD FAILURES AT OIL SPIT HOLE - HAD ONE???
Replies: 30
Views: 1124

Re: CONNECTING ROD FAILURES AT OIL SPIT HOLE - HAD ONE???

We had a customer break one at the spit hole in a dirt track engine. He was just hot lapping and didn't even make 2 full laps, and was just keeping the engine below about 5000 RPM. He was using them in a 351W engine and built a budget long rod combo with JE pistons that only weighed about 400g. So i...
by CNC-Dude
Tue Nov 20, 2018 11:08 am
Forum: Fuel Injection - Mega Squirt
Topic: Home made 36-1 trigger wheel
Replies: 16
Views: 1627

Re: Home made 36-1 trigger wheel

Its my understanding from the wheels i've made before that they need to be made from iron or steel because the sensors create a magnetic field and aluminum isn't magnetic. Also the teeth need to be sharp at the bottom instead or having a radius because it affects the pulse signal.
by CNC-Dude
Mon Nov 19, 2018 9:42 am
Forum: 144-250 "Small Block" Six Performance
Topic: Aluminium heads other than vintage inlines
Replies: 7
Views: 708

Re: Aluminium heads other than vintage inlines

Go with a proven design and quality product like the Classic Inline head Matt offers. By the time you pay duties and customs plus shipping from Argentina, and the communication barrier, you could pay more and still have a poorer quality product. Then you have to deal with sending it back on your nic...
by CNC-Dude
Thu Nov 15, 2018 11:49 am
Forum: 144-250 "Small Block" Six Performance
Topic: What’s a fair price for a stock C9 250 head (about 100k miles)
Replies: 11
Views: 596

Re: What’s a fair price for a stock C9 250 head (about 100k miles)

Most shops won't buy any blocks, heads or cranks until they are degreased and magnafluxed first, then they will give you the standard $40 or $50 going rate. Most people will not buy one that isn't magnafluxed first. There is just too high of a risk of them being cracked or unusable.
by CNC-Dude
Wed Oct 31, 2018 9:19 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Headers with turbo adapter
Replies: 8
Views: 957

Re: Headers with turbo adapter

Econoline wrote:CNC-Dude, do you have the small six flanges?


No, but I do have a CAD file for them if anyone is interested. I didn't create it, someone else here did so I can't verify the accuracy so you'll need to keep that in mind. I don't have a head or I could do it.

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