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Search found 1349 matches

by CNC-Dude
Fri Apr 03, 2009 12:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 6cyl. rod big end width???
Replies: 25
Views: 3378

The B/E width on a 300 rod is .982 +/-, which at best will give you .040 side clearance. Just keep in mind the more side clearance, the more oil pressure bleed off you will have. Typically, .020 is pretty ideal for a race engine for side clearance with steel rods, i 've run aluminum rods with .040 b...
by CNC-Dude
Fri Mar 27, 2009 2:23 am
Forum: 144-250 "Small Block" Six Performance
Topic: full floating pins / bushed rods
Replies: 11
Views: 1059

Snap a spiral lock in and use the pliers to remove and you can carry a bag of spiral locks. I believe you are thinking of Tru-arcs, they are similar to snap rings, and require pliers to install/remove them. A spiro-loc is a very secure fitting retention device, that does just as its name implies. I...
by CNC-Dude
Wed Mar 25, 2009 9:11 pm
Forum: 144-250 "Small Block" Six Performance
Topic: Machine Shop, torque plates, FL
Replies: 1
Views: 374

BHJ and Yother offer them. Definately recommended for any performance use whether its V8 or inline....
by CNC-Dude
Wed Mar 25, 2009 6:10 pm
Forum: 144-250 "Small Block" Six Performance
Topic: What size O-ring and how deep a groove?
Replies: 3
Views: 532

At only .021 deep with a .042 wire, the widest part of the wire is hardly inside the groove, if at all. Typical O-ring protusion above the deck is in the .008-.010 range with that size wire. It might be a good idea to take the gasket in case it needs to be "massaged" for clearance around any bolt ho...
by CNC-Dude
Sat Mar 21, 2009 11:26 pm
Forum: The Falcon's Nest
Topic: Looking for a Ranchero fiberglass tonneau cover
Replies: 3
Views: 1433

You can try Gaylord's, they offer them for most PU's and many different years of El Caminos....
by CNC-Dude
Thu Mar 19, 2009 12:02 am
Forum: Turbo, Supercharger, and Nitrous
Topic: O ring block for turbo application
Replies: 13
Views: 1889

With only 4 head bolts per cylinder, O-ringing a Ford is never overkill....you'll be glad you did!
by CNC-Dude
Sat Mar 07, 2009 9:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 I6 roller chain/timing gears
Replies: 4
Views: 928

Some 6's have timing chains and gears, but the 300 and most Cheby 6's use a gear drive. Cams that use a (2) gear gear-drive rotate backwards from a chain drive camshaft, so if you are thinking of trying to morph something, take that into consideration when selecting a camshaft.
by CNC-Dude
Sat Mar 07, 2009 2:17 pm
Forum: Fuel Injection - Mega Squirt
Topic: Nitrous Question??
Replies: 21
Views: 3081

i wonder if the same principle would apply to a turbo or supercharged motor because the intake is already charged and will push as much air in as it can. but on the exhaust side a larger valve might help get the exhaust out faster. Those types of mods are actually done, a head that is going to be u...
by CNC-Dude
Fri Mar 06, 2009 11:58 am
Forum: 144-250 "Small Block" Six Performance
Topic: Porting the 200 head: Benefits, drawbacks, how-to, pics, etc
Replies: 20
Views: 1753

Would love to CNC it but I have two major problems: 1. I work on lathes only and 2. I work for a major defense contractor that frowns upon (read: fires) people bringing in their own work. As many links as can be provided would be great, plus I'm interested to hear what people think about this. Is i...
by CNC-Dude
Fri Mar 06, 2009 1:28 am
Forum: 144-250 "Small Block" Six Performance
Topic: Porting the 200 head: Benefits, drawbacks, how-to, pics, etc
Replies: 20
Views: 1753

There were some pics of a head that was sectioned so you could see how thick(or thin) the head is in some critical areas. I cant remember the title of the post, but it was pretty recent and I think it was in the small six section. Are you going to try to CNC it when nobody is looking(LOL).
by CNC-Dude
Thu Mar 05, 2009 11:43 am
Forum: 240-300 "Big Block" Six Performance
Topic: Torque plate honing on a 240/300 block?
Replies: 10
Views: 1398

There should be no shortage of FUBAR heads out there. Cutting (6) 4.10 diameter holes in one is hardly rocket science, nor is it even remotely precision work. The machine shop which is doing the machining for your rebuild would probably cut one for a nominal fee especially if you offer to let them ...
by CNC-Dude
Thu Mar 05, 2009 1:25 am
Forum: 240-300 "Big Block" Six Performance
Topic: Torque plate honing on a 240/300 block?
Replies: 10
Views: 1398

Raul, the washer idea won' t accurately simulate the cylinder head being torqued on the block, and could actually create a worse condition to the cylinders shape when the head is installed on the block. I know BHJ and Yother make torque plates for most popular engines,including the 300, and it might...
by CNC-Dude
Wed Mar 04, 2009 6:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Torque plate honing on a 240/300 block?
Replies: 10
Views: 1398

I've seen instances were people have actually used a damaged or cracked head, and machined the area out over the top of the cylinders so the hone will fit into the bores. Trying to use any other plate like a 351W wont be as effective, if at all.
by CNC-Dude
Sun Mar 01, 2009 9:22 pm
Forum: 144-250 "Small Block" Six Performance
Topic: hone ,, what grit?
Replies: 6
Views: 866

Your welcome! You also can contact the ring manufacturer, they will be more than glad to give their recommendations for the ring type you are using and application your using it for....
by CNC-Dude
Sun Mar 01, 2009 5:37 pm
Forum: 144-250 "Small Block" Six Performance
Topic: hone ,, what grit?
Replies: 6
Views: 866

Junk-Falcon wrote:im not running molly
The 525-625 grit is for a cast ring, the 820 is for moly and other exotic rings!
by CNC-Dude
Sun Mar 01, 2009 3:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hypertech programmers?
Replies: 5
Views: 986

Hypertech has the results of their programmers listed on their website. Even for the highest HP gains for the LS engines in Corvettes they only add right at 20 HP for those engines. I doubt for a 6 banger you would even get a proportional amount of increase. For the cost of around $350 bucks, I thin...
by CNC-Dude
Sun Mar 01, 2009 3:03 pm
Forum: 144-250 "Small Block" Six Performance
Topic: hone ,, what grit?
Replies: 6
Views: 866

Those grits would be ok for roughing the bore, for finishing honing you need 525-625 grit, even for a stock rebuild ! Much more finer grits are used for racing applications....typically around 820!
by CNC-Dude
Tue Feb 24, 2009 1:49 am
Forum: 240-300 "Big Block" Six Performance
Topic: What happens if I run a 300 without a harmonic dampener?
Replies: 16
Views: 2796

What are you actually trying to install the engine in that is giving you this clearance issue!
by CNC-Dude
Tue Feb 24, 2009 1:47 am
Forum: 144-250 "Small Block" Six Performance
Topic: How do I get correct firinng order with the DUI
Replies: 7
Views: 1201

There's really an infinite number of spots you can get the distributor to fall into the engine with. Many people install them so they can have movement for timing settings so the vacuum advance will not interfere with the block or anything before the desired timing setting is reached. You can make a...
by CNC-Dude
Fri Feb 20, 2009 9:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Head Question
Replies: 26
Views: 2316

78stepside wrote:I see, so what is a good method of transfering runners size from one to the other? so they match up.
Since the limitation is in the intake manifold itself, that should be the standard that the head it made to fit. Port and shape the intake first, then make and match the head to it!
by CNC-Dude
Wed Feb 18, 2009 11:59 am
Forum: 144-250 "Small Block" Six Performance
Topic: Block decking
Replies: 5
Views: 987

Many people incorrectly assume that even unmachined stock blocks and heads come from the factory with acceptable valve train geometry. When in fact, they have a +/- tolerance for manufacturing like all other components. So, any time you have to cut a block or head a considerable amount for a rebuild...
by CNC-Dude
Tue Feb 17, 2009 6:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Ford Drag Engine
Replies: 10
Views: 3794

CNC-Dude IIRC Sizemore's maverick was in the mid to low 11's,11.40's I think. In 78-79 is when he started running I/Gas the first car was one of Gliddens old pintos. I have a couple of pictures one being an engine shot, I'll see if I can post them or get a link. Ok, thanks. I also should have payed...
by CNC-Dude
Tue Feb 17, 2009 12:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Ford Drag Engine
Replies: 10
Views: 3794

There was a man from Alabama in the 70's that had probably the fastest H/MP 300 that there was. His name is Gary Isbell, and was one of my toughest competitors against our ChevyII. That magazine article never states what kind of ET or performance the Sizemore car had. But knowing there is a huge dif...
by CNC-Dude
Tue Feb 17, 2009 11:48 am
Forum: 240-300 "Big Block" Six Performance
Topic: What happens if I run a 300 without a harmonic dampener?
Replies: 16
Views: 2796

They really are vital to engine life expectancy, and other alternatives should be looked into for your clearance problems. Removing it completely should be at an extreme last resort. As FTF said it will break the crankshaft...NO ifs, ands or buts about it, regardless of RPM or how little you use or ...
by CNC-Dude
Tue Feb 17, 2009 11:33 am
Forum: 240-300 "Big Block" Six Performance
Topic: 300 head flow#
Replies: 54
Views: 8395

Someone in a recent post(just over the past weekend), finally found some guideplates that will work on the 300's. The Cheby six has pressed in rocker studs, and doesn't use guide plates!
by CNC-Dude
Tue Feb 17, 2009 2:28 am
Forum: Aussie Ford Sixes
Topic: How do you get HW5200 on the aussie head intake manifold?
Replies: 2
Views: 982

Simple, plug the original 4 threaded holes with aluminum bolts, and redrill for desired carb! You can Lok-Tite the aluminum bolts in the holes, and with a hacksaw, cut them off close to flush with the mounting flange, and file them down the rest of the way until you can blend them with the carb sufa...
by CNC-Dude
Tue Feb 17, 2009 2:15 am
Forum: 144-250 "Small Block" Six Performance
Topic: What kind of horsepower can prepped stock rods support?
Replies: 4
Views: 785

Compression also! Its kind of a double edge sword. Like inliner said, its not the HP that gets you. But without RPM and high compression you don't make any HP....unless your boosted or nitrous! Most all Pontiac V8's used a cast rod all thru the 60's and 70's in their GTO's and TA's, some making over...
by CNC-Dude
Mon Feb 16, 2009 12:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 head flow#
Replies: 54
Views: 8395

well to update you all....i have two intake and two exhaust ports done. i have noticed that the casting is fairly bad. there are big over laps from where the top and bottom castings meet. also the gasket doesn't line up just right. like if i line up the gasket with bolts #1 exh. is off one way and ...
by CNC-Dude
Sun Feb 15, 2009 12:14 am
Forum: 240-300 "Big Block" Six Performance
Topic: needa list of rods with .975 pin
Replies: 2
Views: 475

The most likely source of interchange for you is going to be the SBC family. There are many aftermarket H-beam rods available for those engines, in a variety of lengths from 5.560"-6.350", the 300 rod length is 6.200"! The SBC rod journal size is 2.100" for their large journal V-8 engines, and 2.000...
by CNC-Dude
Sat Feb 14, 2009 11:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: What happens if I run a 300 without a harmonic dampener?
Replies: 16
Views: 2796

I've used a soild hub on 6's in drag racing applications with fair results. Don't know if that is your intention for use or not! Like powerjunkie said, some sort of a hub will need to be used to seal the timing cover....
by CNC-Dude
Sat Feb 14, 2009 1:48 am
Forum: 240-300 "Big Block" Six Performance
Topic: Rear Main Crank Repair Sleeve
Replies: 2
Views: 688

You didn't mention any machine work you might have done with your rebuild, did you by any chance have the block align honed!
by CNC-Dude
Thu Feb 12, 2009 12:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: WWYD - what would you do?
Replies: 32
Views: 3133

I think that you successfully fixed you rocker and lifter problems in the valvetrain area, and should turn your focus in an area that you know still has issues. The posts that im referring to are the one by Does10s, and his recent experiences. As for my experiences, I am a professional engine builde...
by CNC-Dude
Wed Feb 11, 2009 11:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 7/16 guide plates needed for BBC roller rocker conversion
Replies: 11
Views: 1686

80broncoman wrote:When I worked at Crane .
I know Chase Knight well.....small world!
by CNC-Dude
Wed Feb 11, 2009 10:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: WWYD - what would you do?
Replies: 32
Views: 3133

Well the piston skirts don't just mysteriously fall off the pistons for no reason. I guess what brought my attention to this post to begin with, was his failure to be alarmed with what he found in his oil pan, and his bewilderment as to why he still has a noise with half a piston laying in the oil p...
by CNC-Dude
Wed Feb 11, 2009 7:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: WWYD - what would you do?
Replies: 32
Views: 3133

Its possible that you had several problems causing the noise. The new lifters that were installed and other new components, probably cured the majority of the noises, leaving the broken skirt as being the only thing left that wasn't fixed, that you know is still broken and can make that sort of nois...
by CNC-Dude
Wed Feb 11, 2009 6:02 pm
Forum: 240-300 "Big Block" Six Performance
Topic: WWYD - what would you do?
Replies: 32
Views: 3133

Finding a piece of the piston skirt in the pan, should have turned on a light in your head. All the gunked up oil and other stuff was insignificant in comparison to that "find". Obviously it was making the noise before you attempted to tear into it, and find out what was making it. And now after you...
by CNC-Dude
Mon Feb 09, 2009 10:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

Even though there probably isn't going to be anyone here that will attempt anything at the Comp level... Thanks for the offer. I visited a very successful Comp racer using the 240 head (who shall remain nameless) last month and my jaw dropped when I saw the lengths he was going to in his quest for ...
by CNC-Dude
Mon Feb 09, 2009 6:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ported Head Flow#'s Updated (exhaust, large valves) EFI also
Replies: 38
Views: 10830

66 E100 Pickup wrote:it's a brave soul that would put those two seats so close together. John
That isn't that close, most race heads barely have enough room to put a dime on edge between the valves!
by CNC-Dude
Mon Feb 09, 2009 6:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ported Head Flow#'s Updated (exhaust, large valves) EFI also
Replies: 38
Views: 10830

CJ455 wrote:Just talked to the wise man and he said that the 1.78 was way too big. .

Might be too large for a 240, but not a 300!
by CNC-Dude
Mon Feb 09, 2009 11:15 am
Forum: 144-250 "Small Block" Six Performance
Topic: 255p pistons
Replies: 5
Views: 918

350kmileford wrote:

I don't quite understand the 2.320" diameter it is referring to. If those are just sealed power pistons, aren't they the same as the ones Mike sells? Or are they something different/special?
Probably referring to the size(diameter) of the dish on the top of the piston.
by CNC-Dude
Mon Feb 09, 2009 11:10 am
Forum: 240-300 "Big Block" Six Performance
Topic: Undersized Bearings?
Replies: 19
Views: 1527

Should I even bother with taking it to someone else to have it de-rusted or could I just use a strip of sandpaper and sand it a little by hand to clean the crank and rod bearing surfaces up? Its not uncommon for the journals to be out of round by .002 on an engine that has high miles, so without mi...
by CNC-Dude
Sun Feb 08, 2009 9:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

Your racing background sounds quite imprerssive. The last serious world class racer I know of who was actually using a 240 rod was Sizemore on the Prep H car, not the XFLO Pinto. He had the plant make him a set of rods and deleted the big-end oil squirt holes to improve reliability by eliminating t...
by CNC-Dude
Sun Feb 08, 2009 2:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

That 240 rod swap sounds interesting, how did it perform.... Most all of the serious hard-core drag racers I've known have used the 240 length rods (or an aftermarket equivalent). They are easier on the cylinder walls and piston skirts and ring packs, and not as aggressive around TDC in a cylinder ...
by CNC-Dude
Thu Feb 05, 2009 10:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

It depends on several things, mostly how well taken care of the engine has been. On long engines, like 6's, with high miles you can expect to cut .008-.010 off the block to get it back straight and square. If its been run hot many times, as many of the newer heads seem to be a light weight casting a...
by CNC-Dude
Thu Feb 05, 2009 1:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

Well I did the math in my head the first time and I guess I screwed up. I stand corrected. But I do know I have built a 300 with 350 pistons - I guess I must have used the 240 rods (6.79 long) and shaved a little off to get them in there. Its been a while. I don't recommend milling .100 off the blo...
by CNC-Dude
Wed Feb 04, 2009 9:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

Ok, that was the missing key to the puzzle! Just doing the math wasn't explaining how the shorter piston height was working. So decking the block .100 will allow you to use the 327 comp.hgt. piston. Thanks for clearing that up for us....
by CNC-Dude
Wed Feb 04, 2009 7:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240-300 rod oil hole ??
Replies: 8
Views: 1329

My MB diesel has some serious oil squirters mounted in the block that shoot a solid stream of oil into an annular oil passage in the top of the piston. Keeps the pistons cooler under boost. Perhaps the extra oil was for a little cooling affect on the pistons in these cases too. Not a bad thing if i...
by CNC-Dude
Wed Feb 04, 2009 6:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240-300 rod oil hole ??
Replies: 8
Views: 1329

Yep, just think, they were running in their engine just fine before it was torn down. There have been many theories and ideas as to what purpose the oil spit hole actually served. Some peopled have guessed it oils the cam at lower RPM's when there isn't a lot of oil splash to keep it oiled. But I ca...
by CNC-Dude
Wed Feb 04, 2009 6:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240-300 rod oil hole ??
Replies: 8
Views: 1329

The rods without the spit holes are much better for strength, and no, you will not have any problem using them. Other manufacturers used that concept, but abandoned it in the 60's, as Ford should have!
by CNC-Dude
Wed Feb 04, 2009 5:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: pic of 300 with 327 chevy pistons
Replies: 42
Views: 8113

Federal Mogul has a stock replacement 300 piston listed with a compression height of 1.767", and Keith Black has a stock replacement 300 piston listed with a compression height of 1.778". Sealed Power has several pistons listed with compression hgts. in between these two. The 300 has a compression h...

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