Search found 1144 matches

by CNC-Dude
Tue Dec 12, 2017 10:00 am
Forum: 240-300 "Big Block" Six Performance
Topic: Maximum CFM flow potential for 240-300 production heads
Replies: 6
Views: 116

Re: Maximum CFM flow potential for 240-300 production heads

One upgrade you can do is ditch the Webers and go to Holley's. We ruled H/MP for years with Webers and thought they were unbeatable until we swapped over to Holley's and gained close to 30 HP.
by CNC-Dude
Mon Dec 11, 2017 9:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Off Index Lobe Grinding
Replies: 15
Views: 234

Re: Off Index Lobe Grinding

We tried this first in 1978 with one of our 292's because we were killing cam bearings with our insane valve spring pressures and only 4 cam bearing journals. It was still in its infancy back then, but we saw the potential in it.
by CNC-Dude
Mon Dec 11, 2017 4:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Off Index Lobe Grinding
Replies: 15
Views: 234

Re: Off Index Lobe Grinding

I've seen guys on Inliners mention this on some vintage Bonneville GMC engines, but I think you end up with a much stiffer and better cam by enlarging the bearing journals and cam barrel than by trying to add another support boss in the block. We had some SBC Comp guys we did stuff for that in the l...
by CNC-Dude
Mon Dec 11, 2017 9:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Off Index Lobe Grinding
Replies: 15
Views: 234

Re: Off Index Lobe Grinding

Correct, as FTF mentioned. As the base circle becomes larger to add rigidity, you loose the amount of net lobe lift you can achieve. The only way to compensate is to enlarge to bearing journal diameter to increase the barrel and base circle, yet still achieve desired lobe lift. But then you have to ...
by CNC-Dude
Sun Dec 10, 2017 4:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Off Index Lobe Grinding
Replies: 15
Views: 234

Re: Off Index Lobe Grinding

Greg, we experienced another anomaly with Cotton's cams that we didn't realized until by a fluke, Headrick decided to degree the cams on every lobe before and after the valves were adjusted. For years, like most engine builders, he degreed the cams with only the shortblock assembled and all looked s...
by CNC-Dude
Thu Nov 30, 2017 5:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Solid Lifter for Pushrod Measurement
Replies: 16
Views: 234

Re: Solid Lifter for Pushrod Measurement

You will have to add some amount of lifter preload to that reading or the pushrods will be too short.
by CNC-Dude
Thu Nov 02, 2017 4:05 pm
Forum: Vintage Ford Sixes
Topic: Any interest in a new dual carb intake?
Replies: 43
Views: 3872

Re: Any interest in a new dual carb intake?

Well, again after over year of waiting for those who have shown an interest in helping bring this to fruition have fallen threw and not sending any core pieces I needed to begin the patternmaking process, I am once again closing the door on this offer.
by CNC-Dude
Sun Oct 29, 2017 7:05 pm
Forum: Aussie Ford Sixes
Topic: Xflow Head for US Swap - Any Interest
Replies: 7
Views: 453

Re: Xflow Head for US Swap - Any Interest

You kinda threw out there a scenario of a $50 dollar head costing $150-$200 to ship like that was going to be more expensive than one of your heads, so how much for one?
by CNC-Dude
Mon Oct 23, 2017 4:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: bullet proof
Replies: 7
Views: 449

Re: bullet proof

I get 18 MPG in my '05 F350 dually with a 7500 pound trailer. Its a diesel and you'll have a hard time out pulling it with a gas burner and it will cost you a lot more money for what you're intentions are. Like FTF said, I don't know if a 300 swap will be a benefit either towing or gas mileage wise ...
by CNC-Dude
Mon Oct 23, 2017 4:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

Yeah, I was meaning more about the stud fitment since I thought our discussion was heading more towards that. But yes, straps or a full girdle are difficult to fit on some inlines more than others. I have seen a 3/4 length girdle on the Chevy's but have mixed feelings about how beneficial it is over...
by CNC-Dude
Mon Oct 23, 2017 5:34 am
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

On many of the 5.0 Mustangs engines i've built and most Ford V8-s as well as other inlines that used main studs, it is common to have to clearance the oil pump body for stud clearance and to trim the top few threads off of the stud end. That's all just part of the engine building process on some eng...
by CNC-Dude
Sun Oct 22, 2017 10:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

ARP has made stepped main studs for many years to use in engines with windage trays and/or oil pump pick up tube tabs in inline engines and most Ford V8's just for that purpose. They don't come in the stud kits, you have to buy them separately, either just a single one for a pick up tube or 5 or 6 f...
by CNC-Dude
Sat Oct 21, 2017 12:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

You can try it, but I think you're wasting your time and there is probably a reason something like this hasn't already been. And for the same amount of time or less, you can truly make a product that will without a doubt provide a much stronger and proven platform for stiffening and supporting the c...
by CNC-Dude
Sat Oct 21, 2017 9:51 am
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

Doubtful it would be of any benefit. The true benefits of girdles and straps are from there shear mass and size, and a sheet metal oil pan would still have too much flex and give to be a structural component.
by CNC-Dude
Tue Oct 17, 2017 4:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 699

Re: Strapped main caps

Strapping the caps doesn't weaken the cap by milling the caps flat unless you don't put the strap on them. You are actually creating somewhat of a brace by the same thickness of the strap by placing it on the cap, usually 3/4" thick. I have seen many caps broken without being strapped but I nev...
by CNC-Dude
Sat Sep 30, 2017 10:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft main bearing cap bolts?
Replies: 33
Views: 1138

Re: Crankshaft main bearing cap bolts?

Even though you may torque a stud to the same spec as a bolt, the stud closes the housing bores tighter because of the difference between fine threads on the studs and course thread on the bolts. It really is one of those things you have to see and witness by working in a machine shop to understand....
by CNC-Dude
Sat Sep 30, 2017 4:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft main bearing cap bolts?
Replies: 33
Views: 1138

Re: Crankshaft main bearing cap bolts?

Broken rings are normal wear and tear on high mileage engines, I was meaning more serious damage like spun or burned up main bearings that might have introduced elevated temps to the bottom end components. If you didn't have any issues in this area, you will be fine re-using them.
by CNC-Dude
Sat Sep 30, 2017 10:24 am
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft main bearing cap bolts?
Replies: 33
Views: 1138

Re: Crankshaft main bearing cap bolts?

Hundreds of thousands of popular V8's and other types of engines get rebuilt numerous times throughout their 30-40 year lifespan without replacing main bolts or having failures in these areas. So unless any engine damage occurred before you rebuilt this one that would otherwise cause you to suspect ...
by CNC-Dude
Sun Sep 24, 2017 4:45 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Retightening head studs?
Replies: 6
Views: 365

Re: Retightening head studs?

Torquing using factory specs only works when using OEM factory bolts and fasteners. ARP, and most all aftermarket bolt and stud manufacturers have their own specs for torquing their bolts and studs because they are made from completely higher quality grades of steel than OEM bolts are made from. So ...
by CNC-Dude
Mon Sep 11, 2017 4:22 pm
Forum: Wanted
Topic: WTB, Aussi 250 2v head and intake
Replies: 8
Views: 528

Re: WTB, Aussi 250 2v head and intake

They are on ebay quite often, so watch there and you'll get one pretty quickly.
by CNC-Dude
Sat Sep 09, 2017 11:49 am
Forum: 240-300 "Big Block" Six Performance
Topic: Head bolt broke!
Replies: 15
Views: 768

Re: Head bolt broke!

That is a misprint or misinformation. A 7/16" course thread OEM bolt universally only torques as FTF said, whether its Ford, Chevy, Chrysler or any. Torques the same as the main bolts which are also 7/16". Aftermarket fasteners are a different story, but for OEM bolts and fasteners, they a...
by CNC-Dude
Fri Sep 08, 2017 4:15 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Cleaning bare engine block ( hot tank ) at home?
Replies: 29
Views: 1220

Re: Cleaning bare engine block ( hot tank ) at home?

You'll have to remove the cam bearings and probably even the freeze plugs when using methods like this, so keep that in mind before it eats them up. So if money is tight, you may not want to fix it if it isn't broke.
by CNC-Dude
Sat Aug 26, 2017 3:19 pm
Forum: Vintage Ford Sixes
Topic: Knudsen 3 in 1 Intake Manifold
Replies: 2
Views: 198

Re: Knudsen 3 in 1 Intake Manifold

Most intakes of this type with the carbs slanted backwards were for use in boats. You may also want to verify it will actually fit your engine and is not for some other type of specialty engine.
by CNC-Dude
Tue Aug 15, 2017 3:54 pm
Forum: Wanted
Topic: looking for blower pistons for 300
Replies: 2
Views: 246

Re: looking for blower pistons for 300

Many piston companies that offer custom pistons can help you out. Racetec has been mentioned many times on here, they aren't going to be cheap regardless of who makes them, so be prepared to pay more than a "shelf" piston. But it gives you the chance to add features you can't select with a...
by CNC-Dude
Tue Aug 08, 2017 7:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: New Ford 240/300 valve cover....
Replies: 26
Views: 2657

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

old28racer wrote:CNC Dude -- Got any idea of a date for the polished valve covers?
I need to be on a list!
Nice work


My "go to" foundry has decided they are cutting back and not looking to take on new projects at the moment, so I am shopping around for other foundries right now.
by CNC-Dude
Tue Aug 01, 2017 5:04 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Timing tape
Replies: 8
Views: 572

Re: Timing tape

Go to a fabric store and buy you a sewing style tape measure. Just wrap the tape measure around the balancer your self and make your timing marks to reflect +10°, +5°, -5°, -10° and also a total advance mark at -32°, -34°, -36° or whatever you choose. A total advance mark is very beneficial to know ...
by CNC-Dude
Sun Jul 30, 2017 8:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cam bearing size differences!!!
Replies: 11
Views: 850

Re: Cam bearing size differences!!!

Only for the years the blocks use the different OD bearings.
by CNC-Dude
Thu Jul 27, 2017 4:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cam bearing size differences!!!
Replies: 11
Views: 850

Re: Cam bearing size differences!!!

You don't push the bearings thru one bearing hole to get to the next one. You start at the rear and work your way to the front of the block regardless of what size the ID's are.
by CNC-Dude
Tue Jul 18, 2017 4:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cut and See
Replies: 20
Views: 1350

Re: Cut and See

The cutoff for HAMB criteria is 1964 and earlier, so you'll need to find an earlier vintage Ford powerplant to be let in to their events.
by CNC-Dude
Thu Jul 13, 2017 5:40 am
Forum: 240-300 "Big Block" Six Performance
Topic: Tall valve cover
Replies: 10
Views: 1320

Re: Tall valve cover

I'm about 2-2-1/2 weeks out on another batch.
by CNC-Dude
Sun Jul 09, 2017 11:27 am
Forum: Aussie Ford Sixes
Topic: Where to find 250 Crossflow bellhousing spacer plate?
Replies: 3
Views: 290

Re: Where to find 250 Crossflow bellhousing spacer plate?

That plate is only .025"-.030" thick, so I can't see that making or breaking a flexplate install for clearance. If I had one laying around I would gladly create a CAD file for you to get one laser cut or water jetted though.
by CNC-Dude
Sat Jul 08, 2017 11:46 pm
Forum: Aussie Ford Sixes
Topic: Where to find 250 Crossflow bellhousing spacer plate?
Replies: 3
Views: 290

Re: Where to find 250 Crossflow bellhousing spacer plate?

I can't tell you how many of those I have thrown away on the dozens of 302's, 351W and Cleveland's and other Ford engines i've built. I don't think they are actually necessary in case you can't find one. They haven't ever caused any issues in the many Ford engines i've built, and i've known many oth...
by CNC-Dude
Fri Jul 07, 2017 4:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Valve cover
Replies: 31
Views: 1865

Re: Valve cover

That same thing is an issue with the 5.0 Mustangs when you use a HV oil pump. The pump housing is plenty thick enough to grind and relieve for main cap bolt/stud clearance.
by CNC-Dude
Fri Jun 30, 2017 5:09 pm
Forum: Forum Issues Only
Topic: Photobucket no longer hosts photos to third party (e.g. fordsix) websites
Replies: 11
Views: 830

Re: Photobucket no longer hosts photos to third party (e.g. fordsix) websites

It has to do with the brand of forum software. The software brand this forum uses(phpBB) and many others use(UBBThreads)do not support the ability to host pictures, that's why 3rd party hosting is required. Only changing to a completely different forum software will accomplish this, and it will be l...
by CNC-Dude
Wed May 31, 2017 10:00 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Camshaft installation
Replies: 8
Views: 592

Re: Camshaft installation

I"m seeing a thrust plate used for the cam, so until the forward movement of the cam is about the same as the crank thrust. This will confirm the gear is fully seated on the snout of the cam.
by CNC-Dude
Mon May 29, 2017 5:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: ARP Rod bolts?
Replies: 4
Views: 506

Re: ARP Rod bolts?

That does seem a little pricey based on my experience. The race shop I worked in charged $10 per rod to recondition them and $1 a piece to R&R the rod bolts. So for a 6 cylinder, it was $72 dollars labor, plus the cost of the rod bolts. To pin fit and R&R the pistons was $28 additionally. So...
by CNC-Dude
Wed May 24, 2017 8:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Tall 240/300 Valve Covers
Replies: 14
Views: 1269

Re: Tall 240/300 Valve Covers

I think most cast aluminum valve covers have adequate height and don't require a spacer. Mine spacer is mostly for those using a stock stamped steel valve cover.
by CNC-Dude
Wed May 24, 2017 6:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Tall 240/300 Valve Covers
Replies: 14
Views: 1269

Re: Tall 240/300 Valve Covers

Still working on it. For now the spacer is available if that helps out.
by CNC-Dude
Mon May 22, 2017 6:04 pm
Forum: Announcements
Topic: Marshall Inline Products featured in Hot Rod Mag......
Replies: 5
Views: 740

Re: Marshall Inline Products featured in Hot Rod Mag......

Thanks everyone, now let's see if we can get some Ford 6 exposure.
by CNC-Dude
Mon May 22, 2017 5:58 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Rear Main Seal
Replies: 8
Views: 686

Re: Rear Main Seal

The edges of the seal protrude above the block and caps parting line, so when the cap is torqued, it provides crush to the seal to hold it in place.
by CNC-Dude
Sun May 21, 2017 3:07 pm
Forum: Announcements
Topic: Marshall Inline Products featured in Hot Rod Mag......
Replies: 5
Views: 740

Marshall Inline Products featured in Hot Rod Mag......

Constantly trying to get inlines noticed in magazines is always a challenge, so participating with them in feature articles is always a positive sign. Here is a recent Hot Rod Magazine article that used one of my products I designed and manufacture in a series of dyno tests for an inline engine buil...
by CNC-Dude
Sat May 20, 2017 4:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Big Six aluminum head update 9-14
Replies: 185
Views: 60614

Re: Big Six aluminum head update 9-14

Gary Isbell ran low 11 second quarter mile times in his Modified Production Maverick back in the mid-1970's with a 300 engine in it. Using modern porting and cylinder head techniques we have now in the 21st century, a stock production cylinder head still offers more than enough potential for what pe...
by CNC-Dude
Mon May 15, 2017 4:07 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Rear Main Seal
Replies: 8
Views: 686

Re: Rear Main Seal

Yes on the sealer! Its common practice to rotate the upper and lower halves of the seal so the parting line of the block and cap is offset from the parting line of the seal halves to reduce the chance of leaks. Apply a thin dab of sealer at the parting lines of the seal and this should also seal the...
by CNC-Dude
Fri May 05, 2017 6:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Converting a 240 to 300
Replies: 65
Views: 4655

Re: Converting a 240 to 300

Ford specs are to tighten push rod to take up slack and go 1 additional turn then collapse the lifter slowly and check valve stem to rocker arm clearance should be .082 to .152 I checked total advance. It's 45 degrees. Zero lash plus a 1/4 turn is about the most any hydraulic lifter requires. That ...
by CNC-Dude
Tue May 02, 2017 9:26 pm
Forum: 144-250 "Small Block" Six Performance
Topic: 144 vs 170 Head dimensions
Replies: 30
Views: 1827

Re: 144 vs 170 Head dimensions

Thank you very much!
by CNC-Dude
Fri Apr 28, 2017 4:39 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Tall valve cover
Replies: 10
Views: 1320

Re: Tall valve cover

Ryan I have yours ready, pm is sent! I have a few left from my latest batch as of yesterday. If anyone else needs one, just let me know.
Thanks.
by CNC-Dude
Mon Apr 24, 2017 8:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Front timing cover dowel pins
Replies: 4
Views: 483

Re: Front timing cover dowel pins

The Ford 300 doesn't have dowels in the front of the block, there is only bolt holes. You have to let the timing cover self center with the balancer in place and tighten the timing cover bolts before you tighten the oil pan or it will move it off-center and leak.
by CNC-Dude
Sat Apr 22, 2017 9:40 am
Forum: 144-250 "Small Block" Six Performance
Topic: 144 vs 170 Head dimensions
Replies: 30
Views: 1827

Re: 144 vs 170 Head dimensions

Any pics of the underside of the Offy intake? I'm curious how the outer carbs seal to the top of the log. What are the carb spacing dimensions between the carbs? It wouldn't be hard for me to make patterns to cast a manifold for either the 144 or other small 6's.

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