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Search found 1349 matches

by CNC-Dude
Mon Jul 08, 2019 11:38 am
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 4866

Re: So I have a plan but now im Second guessing myself.

Max_Effort wrote:The #1 problem with brand new lifters having issues, is debris inside. They are trash collectors. The second is QC ..

That is absolutely true!
by CNC-Dude
Sun Jul 07, 2019 1:53 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine is back
Replies: 47
Views: 1820

Re: Engine is back

You first need to verify the cams location relative to the cam card to know how much is needed to align with the cam specs. It could require more than expected, or even less but you have to verify and confirm which way to go first. Some camgrinders grind the advance into the cams already, so straigh...
by CNC-Dude
Fri Jun 28, 2019 6:45 am
Forum: Announcements
Topic: My new book available on Amazon now....
Replies: 2
Views: 260

Re: My new book available on Amazon now....

Hey, I completely understand. Mine isn't full of a lot of gore and violence, it's a simple who done it kind of story. In the intro, a car crashes off a steep mountain bluff. The driver has a large amount of War Bonds and cash in his possession, but no identification. So it's more mystery than anythi...
by CNC-Dude
Thu Jun 27, 2019 6:54 pm
Forum: Announcements
Topic: My new book available on Amazon now....
Replies: 2
Views: 260

My new book available on Amazon now....

Hey guys and gals, I finally have my book available on Amazon for everyone's enjoyment if you'd like to do some casual reading. Its an Historical Fiction 1940's crime novel called, Case File: #1948 , and is set in Chattanooga, Tennessee where I grew up and currently work. It mentions many of the ico...
by CNC-Dude
Tue Jun 18, 2019 5:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cover for Timing Gear Cover
Replies: 4
Views: 418

Re: Cover for Timing Gear Cover

I actually just got through modeling up a 2 pc. finned timing cover for the 240/300's. I'm making the patterns now and should have some ready towards the end of summer.
by CNC-Dude
Tue Jun 18, 2019 9:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Turboing a stock 300, how to make it last?
Replies: 74
Views: 4045

Re: Turboing a stock 300, how to make it last?

Even OEM fasteners do that in stock blocks, but is a non-issue proven by many time and time again as well. The point is you made an unsound and invalid comment based on your "theory" that could cause members with less experience to possibly take your "theory" as being a sound and...
by CNC-Dude
Mon Jun 17, 2019 5:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Turboing a stock 300, how to make it last?
Replies: 74
Views: 4045

Re: Turboing a stock 300, how to make it last?

Also would consider only tightening the head studs to factory bolt specs as to prevent pulling up on the deck too much. Just a theory ive been using. You would just be defeating the purpose of using a better quality head stud by failing to ensure you stretch it to ARP's engineered specifications, a...
by CNC-Dude
Sun Jun 16, 2019 7:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 4866

Re: So I have a plan but now im Second guessing myself.

Another issue with using stock style stamped steel rockers for valve lifts over .500" is that the slots can't allow the rockers to pivot that much without binding against the rocker studs. Even in high performance versions of Big Block Chevy's, GM had to make special long slot stamped steel roc...
by CNC-Dude
Thu Jun 13, 2019 9:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Priority main oiling?
Replies: 4
Views: 447

Re: Priority main oiling?

On Cleveland engines, you tap and install restrictors between the cam and mains. That is mostly for high RPM usage to maximize oil volume to the mains. Really isn't necessary for below 7000 or 7500 usage, but above that it is beneficial.
by CNC-Dude
Wed Jun 12, 2019 8:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Another piston question
Replies: 17
Views: 1010

Re: Another piston question

You only need to use and install the front and rear mains to install the crank to check the deck height. Just use used bearing as has been mentioned and stick the upper thrust bearing in the block and your good. You don't have to fully torque the bolts if you don't want to, but they can be torqued a...
by CNC-Dude
Mon Jun 10, 2019 9:50 am
Forum: 240-300 "Big Block" Six Performance
Topic: Another piston question
Replies: 17
Views: 1010

Re: Another piston question

If he's speaking from experience, then you may need to look into it. Since the 300 stroke is longer than a 390's, and the 300 rod is shorter than the 390's, it stands to reason as the piston approaches the bottom of the stroke, that contact with the counterweighted could occur.
by CNC-Dude
Fri Jun 07, 2019 3:02 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pioneer Rod bolts
Replies: 5
Views: 428

Re: Pioneer Rod bolts

There are different FE rod bolts. One has the football shaped head, the other is the square head. Just make sure of the style you need for your 300 rods.
by CNC-Dude
Fri Jun 07, 2019 11:49 am
Forum: 240-300 "Big Block" Six Performance
Topic: Pioneer Rod bolts
Replies: 5
Views: 428

Re: Pioneer Rod bolts

They are just OEM replacement quality with not much to offer in terms of an upgrade. Never heard anything negative about them though.
by CNC-Dude
Thu Jun 06, 2019 3:40 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Should I Use a Billet Flywheel?
Replies: 17
Views: 1010

Re: Should I Use a Billet Flywheel?

Since its already balanced, there isn't any reason you shouldn't go ahead and use it.
by CNC-Dude
Wed May 22, 2019 11:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Required reading before building a 300.
Replies: 9
Views: 850

Re: Required reading before building a 300.

I worked in a racing machine shop for 15 years, and a lot of that tribal knowledge you just pick up from doing the same processes over and over again until it becomes second nature. Much of the things like deburring the rings after you file them is often just common sense thinking. You would also de...
by CNC-Dude
Thu May 16, 2019 9:53 am
Forum: 144-250 "Small Block" Six Performance
Topic: Final Dynamic Compression Ration Check Assistance
Replies: 38
Views: 1341

Re: Final Dynamic Compression Ration Check Assistance

It has a lot to do with the ignition timing and distributor setup. You can still be well under the DCR recommendation and still ping and rattle if you have too aggressive of an advance curve or incorrectly set up distributor. My reaction would be to push the DCR a little higher to maximize output an...
by CNC-Dude
Sun May 12, 2019 10:04 am
Forum: 144-250 "Small Block" Six Performance
Topic: Final Dynamic Compression Ration Check Assistance
Replies: 38
Views: 1341

Re: Final Dynamic Compression Ration Check Assistance

It will still have to be degreed to assure accuracy because of machining tolerances/errors in the timing set gears and crank keyway.
by CNC-Dude
Sat May 11, 2019 8:41 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Final Dynamic Compression Ration Check Assistance
Replies: 38
Views: 1341

Re: Final Dynamic Compression Ration Check Assistance

For the last few years, I have been heavily involved with quite a few LS racers and have been performing a lot of custom mods for them. I thought I remembered you saying you were using both 91 and 93 octane gas, so if you pushed your DCR into the upper 8's, you would be fine with that. The LS guys a...
by CNC-Dude
Sat May 11, 2019 2:35 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Final Dynamic Compression Ration Check Assistance
Replies: 38
Views: 1341

Re: Final Dynamic Compression Ration Check Assistance

With the extra bump in compression, the larger cam that was suggested can lower the DCR lower. So can advancing/regarding the current cam. Do you have the actual cam opening and closing events to calculate the DCR accurately?
by CNC-Dude
Sat May 11, 2019 12:26 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Final Dynamic Compression Ration Check Assistance
Replies: 38
Views: 1341

Re: Final Dynamic Compression Ration Check Assistance

Jerry and I decided on that cam since I am mostly using this car as a cruiser and not really a racer. RPM range matches my street driving with limited highways. If I take the head down to 50cc my SCR will jump. I’m already at 10:1 with 53cc and flat top pistons. The DCR is more meaningful and what ...
by CNC-Dude
Fri May 10, 2019 11:38 am
Forum: 240-300 "Big Block" Six Performance
Topic: Stainless steel headers - eBay
Replies: 12
Views: 741

Re: Stainless steel headers - eBay

Stainless plus free shipping for that price. Can't beat that.
by CNC-Dude
Wed May 08, 2019 11:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: 600 hp on a 300
Replies: 42
Views: 5975

Re: 600 hp on a 300

That's about what our 292 had for head and HP for H/MP naturally aspirated and a big wallet.
by CNC-Dude
Mon May 06, 2019 11:41 am
Forum: 240-300 "Big Block" Six Performance
Topic: 600 hp on a 300
Replies: 42
Views: 5975

Re: 600 hp on a 300

How is it that Kelly's car (does 10's) makes over 400hp with a 250 and people are saying that the 300 could not handle 600? Isn't the 300 way tougher than a 250? They are using an aftermarket aluminum head. If you used one on the 300, you could possibly achieve that as well. But anytime you approac...
by CNC-Dude
Fri May 03, 2019 5:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Piston wrist pin offset
Replies: 12
Views: 660

Re: Piston wrist pin offset

One thing to consider and do some deductive reasoning with is that cast pistons are not typically made with little to no pin offset, this is nearly a "race only" type of thing because it does make them knock around in the cylinders more, and that type of extra skirt loading is not desireab...
by CNC-Dude
Fri May 03, 2019 9:48 am
Forum: 240-300 "Big Block" Six Performance
Topic: Piston wrist pin offset
Replies: 12
Views: 660

Re: Piston wrist pin offset

Most piston offsets are in the range of .060", not .006" which would basically be zero offset. The offset will be to the same side of the piston when installed with the notches pointing the same direction. When installed in a V8 even with the notches in the same direction, the offset will ...
by CNC-Dude
Wed May 01, 2019 11:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Oil pump issue ?
Replies: 10
Views: 676

Re: Oil pump issue ?

Many people don't realize you need to disassemble new oil pumps to blueprint them also when building an engine. This includes inspecting all components, deburring the gears, adjusting the gears endplay in the main body, checking the function of the bypass spring and plunger to make sure it doesn't b...
by CNC-Dude
Fri Apr 26, 2019 9:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up my block and pistons from machine shop.
Replies: 47
Views: 2835

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

One thing you haven't mentioned is what timing set you are using. It's common knowledge that if using the fiber gear timing set, the gears will shred in no time flat when using anything more than stock valve spring pressures. There are many threads on here discussing this problem. So steer clear of ...
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: 10
Views: 730

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: 49
Views: 3027

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: 49
Views: 3027

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: 487

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: 47
Views: 2835

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: 47
Views: 2835

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: 47
Views: 2835

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: 525

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: 525

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: 525

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: 57
Views: 2476

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: 57
Views: 2476

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: 1590

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: 467
Views: 58019

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: 414

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: 980

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: 877

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: 1748

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: 980

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: 980

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: 54
Views: 2894

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: 1748

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: 1748

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...

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