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Search found 1351 matches

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: 2117

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: 2117

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: 2117

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: 2117

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
Thu Mar 07, 2019 11:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Industrial 300 forged cranks?
Replies: 34
Views: 2117

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: 851

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: 2499

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: 2499

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: 2499

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: 2499

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: 2499

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: 2499

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: 2499

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: 1356

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: 1134

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: 1084

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: 1084

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: 3215

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: 1039

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: 2309

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: 1319

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: 689

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: 2256

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: 2139

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: 2821

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: 1042

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: 1121

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: 1374

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.
by CNC-Dude
Tue Oct 30, 2018 2:10 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Headers with turbo adapter
Replies: 8
Views: 1374

Re: Headers with turbo adapter

Do you want a T3 or T4 flange? I have 3D models for both if you want to make your own or you can just buy them.
by CNC-Dude
Wed Oct 10, 2018 5:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Molnar BBC connecting rods in 300
Replies: 28
Views: 2767

Re: Molnar BBC connecting rods in 300

Molnar makes a set of Chevy 292 6 cylinder H-Beam rods that are near the same specs as your rods Greg, they are only $620 for a set of 6 for the Chevy engine, so they may not be that terrible to have them make you a set for the Ford 6. They are correctly double chamfered on each side and not offset ...
by CNC-Dude
Mon Oct 08, 2018 2:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Molnar BBC connecting rods in 300
Replies: 28
Views: 2767

Re: Molnar BBC connecting rods in 300

The rods will actually hit the cam barrel in some engines, and some cam companies even have their cores made with notches in them for factory rod clearance, but still hit the cam with beefier H-beam rods. So it good to check all possibilities and don't assume they won't hit somewhere.
by CNC-Dude
Mon Oct 08, 2018 10:42 am
Forum: 240-300 "Big Block" Six Performance
Topic: Molnar BBC connecting rods in 300
Replies: 28
Views: 2767

Re: Molnar BBC connecting rods in 300

It's not a big deal or that involved. I wrote a book discussing this exact process of installing big block V8 rods into another vintage inline engine, and can be done either in a mill or lathe, whichever you or the shop you decide to use has available to them. Another issue to point out is the possi...
by CNC-Dude
Mon Oct 08, 2018 9:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Molnar BBC connecting rods in 300
Replies: 28
Views: 2767

Re: Molnar BBC connecting rods in 300

No, it's offset from the relationship of the width of the B/E relative to the centerline of the width of the S/E. You can just machine one side of the S/E so it doesn't rub the inside of the piston pin boss. Also, V rods only have adequate chamfering on only one side of the B/E while inline rods hav...
by CNC-Dude
Thu Sep 20, 2018 9:55 am
Forum: 144-250 "Small Block" Six Performance
Topic: 221 Stroked 200 - Myth or Reality
Replies: 22
Views: 2852

Re: 221 Stroked 200 - Myth or Reality

You also have to examine the realistic benefits of doing this and not the theoretical. The costs to do such a small gain in cubes probably won't equal a cost proportional to HP or torque that you'd actually gain.
by CNC-Dude
Mon Sep 17, 2018 3:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 484
Views: 66208

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

It only applies to commercial type ads and not casual, buy/sell items like cleaning out your garage. Soliciting services or parts on a commercial level is only allowed by authorized forum vendors. Also, using the forums messaging system to contact members on behalf of unauthorized forum vendors to s...
by CNC-Dude
Mon Sep 17, 2018 2:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 484
Views: 66208

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

The point is, this entire thread violates forum rules and regulations. So you can't get back to it without continuing to violate the rules.
by CNC-Dude
Mon Sep 17, 2018 11:52 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 484
Views: 66208

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

I pointed out to you some months back that you had been violating forum rules by soliciting parts and services but you didn't seem to get it. Only the authorized vendors shown at the top of the ad banner on the Home Page have this privilege on this forum, and most all other forums as well.
by CNC-Dude
Fri Aug 17, 2018 10:13 am
Forum: 240-300 "Big Block" Six Performance
Topic: More Cam Gear Questions
Replies: 21
Views: 3392

Re: More Cam Gear Questions

As pmuller9 had mentioned, if you'd actually degreed the cam you could have noted the open and closing events of the int/ex to verify what was actually accomplished. Its really a moot point now.
by CNC-Dude
Wed Aug 15, 2018 4:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: More Cam Gear Questions
Replies: 21
Views: 3392

Re: More Cam Gear Questions

I think the 4° retard theory only applied to these engines back in the early 1970's smog emission days, its never been corroborated by anyone with actual Ford knowledge it applied to the later engines. You should have also verified with a degree wheel that you actually installed the 4° key in the ri...
by CNC-Dude
Sun Aug 12, 2018 4:53 pm
Forum: 240-300 "Big Block" Six Performance
Topic: More Cam Gear Questions
Replies: 21
Views: 3392

Re: More Cam Gear Questions

Not sure where the "no longer available" or "discontinued" rumors got started, but I have seen them offered by too many places for almost 2 years when this rumor started for it to be true. That's why I steered you in that direction. Glad you got one, and helped quash the rumor mi...
by CNC-Dude
Fri Aug 10, 2018 6:02 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pulling Cam & Crank Gears
Replies: 13
Views: 1818

Re: Pulling Cam & Crank Gears

Is there a destructive method that will work? I'd hate to pull the cam as Jason823 suggested. Another problem is getting the new gear back on and fully seated against the wedding band spacer to ensure you don't have too much cam thrust, especially with the cam still in the block. Its also a challen...
by CNC-Dude
Wed Aug 08, 2018 2:10 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Composite mpfi manifold
Replies: 9
Views: 1524

Re: Composite mpfi manifold

Yes, volume of the plenum itself, not including the runners should be close to a 1:1 ratio cubic inch wise for a considerably hot performance engine. Naturally aspirated of course.
by CNC-Dude
Sat Aug 04, 2018 3:03 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Composite mpfi manifold
Replies: 9
Views: 1524

Re: Composite mpfi manifold

The CI data for the aluminum head shows and approx. gain of almost 50 HP by using injection over a carburetor, or 351 HP on a 250. So I think it is worth doing. A ported head will achieve an even higher gain.
by CNC-Dude
Thu Aug 02, 2018 9:13 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Composite mpfi manifold
Replies: 9
Views: 1524

Re: Composite mpfi manifold

Since the runners can be taken unbolted from the plenum, a thorough porting of the runners is a breeze and a custom plenum of a larger size can be fab'd to accomodate most any needs.
by CNC-Dude
Wed Aug 01, 2018 4:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 484
Views: 66208

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

Anything between 6.5-7:1 DCR is where you want to be with pumps gas. Since your likely going to run an iron head, i'd stay to the lower side of that range. You can also get a custom grind cam and/or play with the advance or retard, both of those will affect the DCR to tweak it or even add more dish ...
by CNC-Dude
Wed Aug 01, 2018 11:52 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 484
Views: 66208

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

I've already beefed up the top with arp studs and a 1024 felpro gasket, and I've heard many stories of the stock bottom end and holding up to years of 25psi 1/4 mile passes. However I imagine that's with a 8/8.5-1 static compression bottom end. This head would be closer to 9.5-1 with the stock bott...
by CNC-Dude
Wed Aug 01, 2018 9:59 am
Forum: 144-250 "Small Block" Six Performance
Topic: Composite mpfi manifold
Replies: 9
Views: 1524

Re: Composite mpfi manifold

The plenum size and shape are the most critical part of this design, second being the runner length and shape. Keeping airspeed and equal flow to the ports is the critical part of the plenum shape, the size has to be large enough to feed the cylinders. So if the engine is 250 cubic inches, the plenu...
by CNC-Dude
Tue Jul 31, 2018 8:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pulling Cam & Crank Gears
Replies: 13
Views: 1818

Re: Pulling Cam & Crank Gears

Sometimes with a good amount of pressure applied the the puller, you can tap on the bolt with a hammer and it can shock it loose.
by CNC-Dude
Tue Jul 24, 2018 9:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: More Cam Gear Questions
Replies: 21
Views: 3392

Re: More Cam Gear Questions

With close to a 20,000 feedback score, I doubt he's listing something he doesn't have. Many of these sellers buy several dozen items direct at a time from the manufacturer, and since these aren't really very high demand engines, its easily possible he just hasn't sold out of them yet.

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