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Search found 1360 matches

by CNC-Dude
Sun Apr 01, 2018 9:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 75985

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

The potential HP the block can handle is much lower in N/A form than with forced induction. Historically, the Chevy in lines as well as the Ford's become grenades when you get above 500 HP N/A with both block and crank failures. So trying to push a build near or beyond that isn't going to yield sati...
by CNC-Dude
Sat Mar 31, 2018 6:11 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Figuring out pushrod length
Replies: 10
Views: 1337

Re: Figuring out pushrod length

It really doesn't work that way. More important is the rocker contact path on the tip of the valve. An adjustable pushrod length checker is desirable for this. I made up a batch of them some time ago but am out of them or i'd send you one to use. Here is how the cam companies recommend you do it. ht...
by CNC-Dude
Sat Mar 31, 2018 12:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Private label vs name brand.
Replies: 3
Views: 897

Re: Private label vs name brand.

They still have to eat it if it goes bad. So I wouldn't think it would always be lesser quality. Some of the these companies also own smaller companies they may sub the work out to that have cheaper labor rates(overseas plants), but it still needs to pass their same QC requirements I would think.
by CNC-Dude
Sat Mar 31, 2018 12:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Private label vs name brand.
Replies: 3
Views: 897

Re: Private label vs name brand.

Many private label brands are also made by the same top shelf manufacturers. That way they control the whole market by offering the lesser priced products as well as the higher end ones. As you mentioned, the quality on the private label parts are just as good and still has the same "lifetime w...
by CNC-Dude
Wed Mar 28, 2018 10:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 75985

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

I'm sure price will be a large factor. Inline guys in general are well known for not wanting to spend any money, mostly because they just don't have it to spend.
by CNC-Dude
Fri Mar 23, 2018 3:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Wrist pins
Replies: 10
Views: 1598

Re: Wrist pins

There are somewhat special support fixtures to keep from exploding the pistons when you press them apart. If the pistons aren't supported on the pin bosses correctly, even just one ton of pressure can break them. But typically only a few tons is enough to break the pins loose from the rods.
by CNC-Dude
Thu Mar 22, 2018 2:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

Since my background and Bruce's is so similar I keep forgetting and comparing my comments to that level of performance and not the milder street/strip levels of most of the enthusiasts here.
by CNC-Dude
Thu Mar 22, 2018 2:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

There has never been a problem with using the .750" long offset key with the 300 six cam gear. The key has a thickness of .188" and that is only reduced to .153" at the shear point with the offset. Secondly the cam gear has a very tight press fit to the cam snout and will absorb most...
by CNC-Dude
Thu Mar 22, 2018 10:00 am
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

I'm curious: is there an advantage to replacing the gears if all that is needed is a key? When you pull your timing cover and find that the cam timing gear is fiber, you will want to replace it with a metal gear set. The offset key only fits the cam gear which is a very tight press fit. Once a mult...
by CNC-Dude
Thu Mar 22, 2018 9:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

There are still a lot of the desirable Cloyes multi keyway timing sets sitting in parts distributors inventory such as Jegs and Summit, and even eBay. So there is plenty of supply to provide enough to fulfill the few builds that are actually being done for quite a while.
by CNC-Dude
Sun Mar 18, 2018 9:01 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust port question.
Replies: 18
Views: 3232

Re: Exhaust port question.

Those depressions where there before you started and it ran tens of thousands of miles already without any visible issues. By blending and grinding the port like you have, you've actually improved it from its original condition. So I wouldn't be too concerned with it. If you are, just do as brandonc...
by CNC-Dude
Sat Mar 17, 2018 10:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

Ted , I understand about the brand recognition. However, historically unbranded items like valve cover, side covers and even intakes have failed to be popular choices to hot rodders, because that was always the bragging rights for faster hot rods with statements like "After installing my Edelb...
by CNC-Dude
Fri Mar 16, 2018 4:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

Focus your efforts on more unique and useful things (the head). Any attention spent on products and services are useful and needful, even though these particular things may not be to you. These grassroots items are going to far outsell the cylinder head by a long shot. Many guys rebuilding these en...
by CNC-Dude
Thu Mar 15, 2018 9:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

You still align the gears dot to dot using the stock timing mark, the crank is actually rotated depending on which keyway slot you use and the crank position is moved by xxxx degrees relative to the gear position.
by CNC-Dude
Thu Mar 15, 2018 2:11 pm
Forum: 144-250 "Small Block" Six Performance
Topic: What H.P. gains from porting a modified 2v head?
Replies: 13
Views: 2240

Re: What H.P. gains from porting a modified 2v head?

As for port matching and smoothing the casting flash adding HP. It's all part of the puzzle, and if you did that alone and no bowl work, then it likely wouldn't add any measurable increases. Bowl work is where the majority of all port work gets the most benefit and gains. Adding larger valves withou...
by CNC-Dude
Wed Mar 14, 2018 9:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing sets
Replies: 48
Views: 6659

Re: Timing sets

Using an offset key is not the most desirable method to advance/retard camshafts. You narrow the cross sectional strength of the key and it requires much less stress to shear it compared to a key that is full width. You may be ok for stock engines, but in performance apps where you have increased sp...
by CNC-Dude
Wed Mar 14, 2018 4:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: New Ford 240/300 valve cover....
Replies: 29
Views: 6534

Re: New Ford 240/300 valve cover....

I had found a small foundry willing to take on small runs of products. He can cast my intakes for me, and thought he could do the valve cover. But it turns out he discovered, the valve cover core boxes are over 100 pounds when full of sand, and the pour will require 2 people, and he is a one man sho...
by CNC-Dude
Sun Mar 11, 2018 2:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Deck the block or offset grind?
Replies: 4
Views: 986

Re: Deck the block or offset grind?

It's not uncommon for all the cylinders to have different deck heights in a seasoned, unmachined block deck. So I wouldn't sacrifice turning the crank excessively. Since your tearing the engine down completely, just do a cleanup cut on the blocks deck to get the deck where you want it. You can only ...
by CNC-Dude
Tue Feb 27, 2018 10:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 75985

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

Kudos on the ambition and desire. One piece of advice that would carry this to a much higher plateau faster and more economically than you can take it yourself. I would saw a single cylinder segment off of a cylinder head and send it to a truly top shelf cylinder head porter that is up to date on al...
by CNC-Dude
Tue Feb 27, 2018 9:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 75985

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

That's one reason why I haven't pushed ahead to create one based on my Duggan 12 Port Chevy head patterns. For 99% of any Ford hotrodder or racer, the stock cylinder head that is ported will provide all the power needed for what the rest of the components can handle. For the remaining 1% or less of ...
by CNC-Dude
Sun Feb 25, 2018 9:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 75985

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

Forum member SIX GUN has a production cylinder headed ported by the late Jerry Arnold head on his car in the video below that flows well beyond the 250 CFM range in the 260-270 CFM range. His car has run 10.90 quarter mile times so far. Using more modern and current head porting techniques they can ...
by CNC-Dude
Sat Feb 24, 2018 11:01 am
Forum: 144-250 "Small Block" Six Performance
Topic: Custom Forged Pistons
Replies: 19
Views: 3416

Re: Custom Forged Pistons

Don't assume that your block will make a .030" overbore. Have the machine shop clean and rough bore the block first before you order pistons. Some companies wont accept returns if you order the wrong size. The same goes for bearings as well, have the shop verify what size the journal's will mak...
by CNC-Dude
Tue Feb 13, 2018 7:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Early Ford 300 head (years / shape / cc)
Replies: 26
Views: 3361

Re: Early Ford 300 head (years / shape / cc)

Any piston in the bore size you are going to get is made from what is considered a small block based piston forging. You are just going to be using a BBC pin size. Piston manufacturers often create pistons for many different engine brands using a somewhat universal forging die. In the case of engine...
by CNC-Dude
Tue Feb 13, 2018 6:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Early Ford 300 head (years / shape / cc)
Replies: 26
Views: 3361

Re: Early Ford 300 head (years / shape / cc)

[b]pmuller9 & CNC-Dude [/b] --- If I take a set of BBC rods that have this big end off-set, Take care of the other side chamfer, Bush the small end for .990 floating pins and order a set of Forged custom pistons in the correct CH with floating pins to make 11.5 - 12.5 CR with 68cc heads. Will t...
by CNC-Dude
Tue Feb 13, 2018 6:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Early Ford 300 head (years / shape / cc)
Replies: 26
Views: 3361

Re: Early Ford 300 head (years / shape / cc)

arse_sidewards wrote:
old28racer wrote:Now the big question. How do I make the BBC 6.385" long rods with 2.100 journals fit the 300 crank rod journals that are 2.1228 - 2.1236'?


With a boring head and the things required to make proper use of it.

You make the crank fit the rods, not make the rods fit the crank.
by CNC-Dude
Tue Feb 13, 2018 9:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Early Ford 300 head (years / shape / cc)
Replies: 26
Views: 3361

Re: Early Ford 300 head (years / shape / cc)

V8 connecting rods are also offset in width in the bearing
end of the rods. This moves the connecting rod to one side or the other on the crank journal and makes it fit into the piston offcenter as well. Just make sure the small end of the rod doesn't bind or rub the pistons pins boss.
by CNC-Dude
Sat Feb 10, 2018 7:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Early Ford 300 head (years / shape / cc)
Replies: 26
Views: 3361

Re: Early Ford 300 head (years / shape / cc)

I don't think the 300 ever came with a "high compression" head, you must be thinking of the smaller chamber 240 head that has the kidney shaped chamber.
by CNC-Dude
Sat Feb 03, 2018 6:32 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 triple carb ideas
Replies: 8
Views: 2000

Re: 300 triple carb ideas

The bore spacing on numerous 40MM-48MM DCOE's i've CMM'd is 3.550", and the IDF's in that same size range have the same spacing.
by CNC-Dude
Thu Feb 01, 2018 7:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240 rods the good ones???
Replies: 16
Views: 2469

Re: 240 rods the good ones???

Typically, I like to remove the rod bolts and polish the beams. Then shotpeen, cut the rod caps and deburr the parting line on the caps and rods. Then install new rod bolts, preferably ARP and torque to specs. Then balance and side clearance the rods, and then recondition as the last step.
by CNC-Dude
Tue Jan 30, 2018 5:53 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240 rods the good ones???
Replies: 16
Views: 2469

Re: 240 rods the good ones???

Now see if you can get 6 of them to be close enough weight-wise to make a set.
by CNC-Dude
Sat Jan 27, 2018 7:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

Lightening the crank can help also. Just picture these 6 cylinder cranks(Ford, Chevy and Chrysler) as being like a piece of spaghetti(unboiled). The more mass the cranks have ie. counterweights and rods/pistons, the more the crank flexes as it spins the higher it spins, helping to induce the dreaded...
by CNC-Dude
Sat Jan 27, 2018 9:44 am
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

Oh absolutely! The converter seems to act like another dampener to absorb shock and harmonics that can kill a stick car. Great point and observation. :thumbup: We were on the ragged edge for sure and so were others. If it wasn't the crank, it was kicking a rod and piston out of the side of the block...
by CNC-Dude
Sat Jan 27, 2018 9:02 am
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

Its no secret that forced induction engines can make more HP with less parts breakage than high HP naturally aspirated engines. FTF and Rich in past years posted in depth articles of Bruce's I/Gas Pinto, and it mentioned that while his engine did have forged cranks in them, they still only lasted an...
by CNC-Dude
Fri Jan 26, 2018 8:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

It was our Chevy 292 6 cylinder. They have a 4.120" stroke. We left the line between 10,500-11,200 RPM, but shifted at 7000 RPM. Our cast cranks only lasted (20) 1/4 mile passes, but have seen some of our Ford competitors with forged cranks only last as little as 15 passes with reportedly much ...
by CNC-Dude
Fri Jan 26, 2018 2:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

The journal overlap kills it when the stroke goes beyond 4" like ours was at these power levels N/A. Even billet can't withstand the harmonics in those scenarios in high RPM and very high compression, forced induction they would last longer because the stresses are much less and the RPM's are a...
by CNC-Dude
Fri Jan 26, 2018 11:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

We ran a few forged cranks in our H/MP car, but they broke with fewer passes than the cast cranks did so we always ran the cast cranks afterwards. Even Ford guys that ran forged cranks broke them with fewer passes than we did with cast cranks. So we never saw any benefit to getting custom cranks mad...
by CNC-Dude
Tue Jan 23, 2018 4:35 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Milling off log head intake
Replies: 8
Views: 1568

Re: Milling off log head intake

Yes, there are quite a few threads here discussing it and showing it done. Just do a search and see what pops up.
by CNC-Dude
Fri Jan 19, 2018 11:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Sandwich head. Or two piece head.
Replies: 40
Views: 7421

Re: Sandwich head. Or two piece head.

Indy Cylinder Head used to furnace brazen our 6 cylinder heads when a combustion chamber would blow out of them. Don't know if they still do this or not but the did then.
by CNC-Dude
Sat Jan 13, 2018 11:51 pm
Forum: Aussie Ford Sixes
Topic: Importing a 4.0L Engine into the USA
Replies: 8
Views: 18271

Re: Importing a 4.0L Engine into the USA

That really falls outside the scope of their concern. Their agency only cares about is that the products coming or going into the country aren't on a prohibited list and that the duties and taxes are collected. How or what the products are used for isn't their concern.
by CNC-Dude
Sat Jan 13, 2018 7:29 pm
Forum: Aussie Ford Sixes
Topic: Importing a 4.0L Engine into the USA
Replies: 8
Views: 18271

Re: Importing a 4.0L Engine into the USA

Based on what was said, I would think so. Myself, I wouldn't hesitate to install one in an older hot rod like a Mustang or Maverick. If the car is already registered and titled, i've never had anyone ever ask me at the tag office if the engine is original or not, and most state don't do inspections...
by CNC-Dude
Sat Jan 13, 2018 11:42 am
Forum: Aussie Ford Sixes
Topic: Importing a 4.0L Engine into the USA
Replies: 8
Views: 18271

Re: Importing a 4.0L Engine into the USA

Based on what was said, I would think so. Myself, I wouldn't hesitate to install one in an older hot rod like a Mustang or Maverick. If the car is already registered and titled, i've never had anyone ever ask me at the tag office if the engine is original or not, and most state don't do inspections ...
by CNC-Dude
Sat Jan 13, 2018 11:39 am
Forum: 144-250 "Small Block" Six Performance
Topic: Weber DCOE?
Replies: 26
Views: 4892

Re: Weber DCOE?

I offer several DCOE side draft intakes for other inline engines I've designed and manufacture, and the DCOE carbs are very tuneable and reliable. I think you'll enjoy them.
by CNC-Dude
Wed Jan 10, 2018 9:54 am
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

Correct, there is one in the works as the ad banner at the top of the webpage here clearly announces. But this isn't an overnight process and takes much design engineering and R&D to perfect the product. Very interesting! I took the time to google Marshall, (is that your project?) I've noticed ...
by CNC-Dude
Mon Jan 08, 2018 6:01 pm
Forum: Aussie Ford Sixes
Topic: Xflow Head for US Swap - Any Interest
Replies: 10
Views: 4027

Re: Xflow Head for US Swap - Any Interest

Installing a OZ Crossflow head onto a USA non-Crossflow block requires extensive block modification. You may want to find the Crossflow head to non-Crossflow block threads here and read through them thoroughly before you decide to purchase one.
by CNC-Dude
Sun Jan 07, 2018 9:25 am
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

Correct, there is one in the works as the ad banner at the top of the webpage here clearly announces. But this isn't an overnight process and takes much design engineering and R&D to perfect the product.
by CNC-Dude
Fri Jan 05, 2018 4:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

Their group buys were made direct from Offenhauser on all occassions, so no chance of counterfeit products. I'll let the Slant 6 guys know that they may need to re-address their issues with them.
by CNC-Dude
Thu Jan 04, 2018 11:58 am
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

This is an ongoing issue they have known about for years. The slant 6 guys did a special group buy direct from Offenhauser on three or four separate occasions and had a high percentage of them warped so bad they weren't usable on each buy over a several year period . There was also a YouTube video o...
by CNC-Dude
Mon Jan 01, 2018 1:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Testing the waters, potential for new cast aluminum valve cover.
Replies: 23
Views: 3677

Re: Testing the waters, potential for new cast aluminum valve cover.

There are already vendors here on the forum creating products for these engines such as this. Just look at the ads at the top of the webpage for details. Also, Offenhauser doesn't make valve covers very well for in lines. There are dozens of threads on the Slant 6 forum with almost 100 complaints of...
by CNC-Dude
Sat Dec 30, 2017 4:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Is there any other Adjustable Gear Set other than the Cloyes 8-1014?
Replies: 11
Views: 2403

Re: Is there any other Adjustable Gear Set other than the Cloyes 8-1014?

I am not aware of any other brand that ever made an adjustable timing set for them. Jeg's, Summit, Rock Auto, Napa also sell them, so you may want to explore those as options to purchase one. You can also get the non-adjustable Cloyes set and have a machine shop broach the other keyways in the crank...

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