Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40, mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry, rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad, drag-200stang, THE FRENCHTOWN FLYER, Jimmys61falcon, rjonah, Sooshi, Robert92867, Invectivus


PLEASE TEST ON http://dev.fordsix.com

<<<***PLEASE READ*** New Site Update >>>

Search found 453 matches

by guhfluh
Sat Feb 22, 2020 10:47 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cylinder heads valves and rockers
Replies: 10
Views: 451

Re: Cylinder heads valves and rockers

There was just one odd head that was not mentioned: Some 1982 300 heads had ridges in the combustion chambers. No one to this point has been able to explain why or in which models the ridges were found. https://i.imgur.com/gTbawb3.jpg https://i.imgur.com/B6JN5Fb.jpg Looks like a normal chamber to m...
by guhfluh
Tue Feb 18, 2020 1:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: A question about aftermarket TBI?
Replies: 19
Views: 363

Re: A question about aftermarket TBI?

Gears and a ZF5? Not sure what year the truck is, but it can be a bolt in swap on some models. I also agree that a 4wd NP435 and transfer case, or even a divorced transfer could be an option for some year trucks. I wonder if a custom thick headgasket would be practical and affordable with a smaller ...
by guhfluh
Mon Feb 17, 2020 12:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: A question about aftermarket TBI?
Replies: 19
Views: 363

Re: A question about aftermarket TBI?

A TBI EFI won't help. A properly tuned sequential port injection could possibly help some, but it'd take quite a bit of tuning to get much benefit. A smaller carb may benefit some from a better signal strength. A good bit of timing advance as mentioned. Mine seems to like manifold vacuum advance mor...
by guhfluh
Tue Feb 11, 2020 2:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Water pumps
Replies: 13
Views: 480

Re: Water pumps

What does the TSB say? And, see my edit. It's been years and I don't recall the TSB number "don't block the radiator bypass circuit because if you do that the coolant doesn't flow around the engine portion of the system very much until the thermostat opens and that could cause localized hot ar...
by guhfluh
Tue Feb 11, 2020 2:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Water pumps
Replies: 13
Views: 480

Re: Water pumps

All 240/300 vehicles were originally fitted with a heater shut off valve which completely blocked any coolant flow in the circuit when shut and no other coolant bypass. There are literally millions of F-series and E series and at least one TSB saying not to block that port that beg to differ Anothe...
by guhfluh
Tue Feb 11, 2020 2:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Water pumps
Replies: 13
Views: 480

Re: Water pumps

Some of the older water pumps without the threaded pilot have the heater input tapped and some don't. If you aren't running a heater core and want one less rubber line to leak it makes running some sort of hard line for the radiator bypass (you can't just delete it without having some other way for...
by guhfluh
Tue Feb 11, 2020 1:56 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Water pumps
Replies: 13
Views: 480

Re: Water pumps

If you aren't running a heater core and want one less rubber line to leak it makes running some sort of hard line for the radiator bypass (you can't just delete it without having some other way for a limited amount of water to move past the thermostat)  This is incorrect. All 240/300 vehicles were ...
by guhfluh
Tue Feb 11, 2020 12:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Camshafts
Replies: 4
Views: 401

Re: Camshafts

Your pictures and descriptions are backwards.
by guhfluh
Mon Jan 27, 2020 6:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rectangle to round exhaust manifold
Replies: 12
Views: 532

Re: Rectangle to round exhaust manifold

16 gauge 321 isn't much more than 304, shopping around. And, if you can get some of the transition made in the flange plate, it shouldn't be too tough to hammer/arbor/press it in to a squircle*, IMO. Job shops are out there, I see, that do that sort of thing. A bucket of 1-1/2" long transition...
by guhfluh
Sun Jan 26, 2020 4:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rectangle to round exhaust manifold
Replies: 12
Views: 532

Re: Rectangle to round exhaust manifold

Sch. 10 is what I've seen recommended, though sch. 40 works as well. I also know of one person who builds manifolds that prefers 16ga, but always has the turbo supported by a strong bracket design from the engine, not the manifold. He just completed a Toyota 7mgte inline 6 manifold a few weeks ago t...
by guhfluh
Sun Jan 26, 2020 3:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Valve length
Replies: 15
Views: 649

Re: Valve length

There is one older board member on here that comes to mind that had used a Crane Hydraulic roller cam. Username: Thad
by guhfluh
Sun Jan 26, 2020 2:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rectangle to round exhaust manifold
Replies: 12
Views: 532

Re: Rectangle to round exhaust manifold

Heat and a vise?
by guhfluh
Sat Jan 25, 2020 4:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 1961

Re: Picked up a Turbo

For what it's worth, my Father-in-law has an 89 F150 300 with a C6, so they were still available in later models if you wanted to swap a case.
by guhfluh
Fri Jan 17, 2020 8:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: First three plugs look great, second three...
Replies: 5
Views: 477

Re: First three plugs look great, second three...

Check where the PCV routes back into the intake and if the intake ports are oil coated from it.
by guhfluh
Wed Jan 08, 2020 9:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 truck headers
Replies: 13
Views: 882

Re: 300 truck headers

Interesting video on headers. Shows the effectiveness of ceramic coatings. Jump to 4:55 in this video where they compare temps of ceramic vs. non. https://www.youtube.com/watch?v=O1bXPNy1Yn4 Kinda, but not exactly. Infrared is not an accurate measuring tool when used with reflective surfaces. It wi...
by guhfluh
Wed Jan 08, 2020 2:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Another piston and connecting rod combination
Replies: 28
Views: 2075

Re: Another piston and connecting rod combination

With the narrower rod, I'd go with a piston guided rod set up. That was the general consensus when I posed the question at this years PRI. It seems any cost benefit of using these rods is then nulled by the machining costs of the Pistons and spacers needed to run piston guided. Have you found anyon...
by guhfluh
Mon Jan 06, 2020 9:51 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Turbo Manifold DIY
Replies: 7
Views: 785

Re: Turbo Manifold DIY

If you want to copy the Cummins manifold you would keep the tubes separate till they reach the collector at the turbocharger flange. Slightly improved sketch: https://www.dropbox.com/s/325vjyfhy7xvhz1/turbo%20manifold%20improved.png?dl=0 Now the challenge is actually making it. Your first sketch wa...
by guhfluh
Thu Jan 02, 2020 1:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 79418

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

Gramps responds in the following post# order: #489- My Pinto gets 1ST Prototype X-flow I will not sell any until I can verify functionality in the dynamic ¼ mile test bed. Time will tell no dates forcast. #490- Your uplifting inspirational post is most appreciated Woodbutcher. Many Thanks and have ...
by guhfluh
Wed Jan 01, 2020 1:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 496
Views: 79418

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

So, I thought the JR head port and chamber were finalized. Are the published numbers and pics for it now not applicable because of flow bench issues? Being it seemed as if it was finished design, it seemed to be ready to be digitized and CNC produced if desired. Is it not the case now? I understand ...
by guhfluh
Sun Dec 22, 2019 12:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Turbo 240 bit the dust. Hole in the block.
Replies: 43
Views: 1693

Re: Turbo 240 bit the dust. Hole in the block.

I was hoping to post the pictures in a fashion that would allow some other valued opinions to build and maybe some other interpretations of the damage but ill do my best to describe the findings. Also i did not pull the head yet or valve cover to see if any top end event played a part. But here goe...
by guhfluh
Sun Dec 22, 2019 10:04 am
Forum: 240-300 "Big Block" Six Performance
Topic: Turbo 240 bit the dust. Hole in the block.
Replies: 43
Views: 1693

Re: Turbo 240 bit the dust. Hole in the block.

board quota reached, is a banner i get also . is this a quota that is ascribed to the unwashed non subscriber? or is the board simply out of space ? bad bit of luck on the blow-up. Was it rod bolts? Now, more than ever, we need a good replacement rod. I remember when turbos on this board were a new...
by guhfluh
Sat Dec 21, 2019 2:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Turbo 240 bit the dust. Hole in the block.
Replies: 43
Views: 1693

Re: Turbo 240 bit the dust. Hole in the block.

Details on when it let go? Cruising? RPM? Under load? How much boost had you gotten up to in the tune so far? Also curious how your timing curve looks in boost as well, just because.
by guhfluh
Sun Dec 15, 2019 6:19 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 1 piece oil pan gasket always leaks
Replies: 8
Views: 718

Re: 1 piece oil pan gasket always leaks

I always use a dab of silicone at the corners of a cap or parting line when installing a gasket. No leaks here with the one piece.
by guhfluh
Tue Dec 10, 2019 6:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

I haven't looked up the info, but as far as I can tell looking at them, they are around the same "heat range" plugs, just the EFI plug electrodes are much longer. I can see it creating a hot spot for preignition in an extreme scenario. I think I'd want to run a cooler plug in a forced indu...
by guhfluh
Sun Dec 08, 2019 7:46 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Ford should have done it
Replies: 43
Views: 1851

Re: Ford should have done it

I also want to mention, I was looking at my engines a day or so ago, looking at where would be a good place for the turbo and piping, and I also thought that below the alternator would be a good place, but that it is a tight fit with my v-belt drive mounting. Looking at the serpentine belt mounting ...
by guhfluh
Sun Dec 08, 2019 4:23 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Ford should have done it
Replies: 43
Views: 1851

Re: Ford should have done it

A turbo blanket should suffice and is inexpensive. It will accelerate rust in my wet climate. But my experience with coating and a SS shield is its still very hot.
by guhfluh
Sun Dec 08, 2019 1:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Chrome vs moly rings
Replies: 3
Views: 438

Re: Chrome vs moly rings

Probably only worthwhile if intended for high performance I'd guess. I'm no ring expert though.
by guhfluh
Sun Dec 08, 2019 12:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Chrome vs moly rings
Replies: 3
Views: 438

Re: Chrome vs moly rings

Just because chrome is hard, can flake and not as easy to break in or seat, I like the more modern moly design. I'm not sure the benefits of chrome, other than maybe wear resistance? I was thinking chrome may be hard on the cyls and wear them faster, but that may be more of steel rings vs ductile or...
by guhfluh
Fri Dec 06, 2019 5:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

Speak of the devil...

https://www.facebook.com/groups/megasqu ... 6&sfnsn=mo

Link G4 knockblock just posted for sale on Facebook MSEFI group.
by guhfluh
Fri Dec 06, 2019 3:56 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

Please show where the Holley Sniper EFI system can take a direct knock sensor input signal and do something with it. On second look, it appears that only the Super Sniper can do that. Bummer. But, it comes with 3 input wires which can be configured. Basically, just showing between 1 and 5 volts. No...
by guhfluh
Fri Dec 06, 2019 2:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

Most knock sensors contain a piezoelectric element (crystal) that is tuned for the specific frequency that is produced by a particular engine and is a narrow band device. Output is in tenths of a volt, the amplitude depending on the intensity of detonation and can be used directly with the Holley E...
by guhfluh
Fri Dec 06, 2019 1:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

The only two knock modules I'd consider trying would be from Plex or Link. Knock sensors need electronic circuitry to handle the small mv signal the sensor outputs and convert it to something useable. The sensor is basically just a microphone. I have wired a wide band sensor to a microphone input on...
by guhfluh
Fri Dec 06, 2019 1:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1245

Re: Engine doesn't like a lot of timing.

Detonation in a 4" bore has a frequency around 5.7 khz. The best way to detect that frequency is to use a Knock sensor. It will not respond unless it sees the high frequency detonation signal. That only works if using a narrow band sensor tuned to the specific frequency of the specific bore si...
by guhfluh
Fri Dec 06, 2019 12:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Adjustable Vacuum Canistor for 300 4.9L
Replies: 25
Views: 1741

Re: Adjustable Vacuum Canistor for 300 4.9L

I'm still not convinced that neither of your vacuum advance canisters are adjustable. Have you tried multiple sizes of Allen wrenches inside the vacuum nipple hole? Basically every canister Ford supplied was adjustable and came adjusted at the factory to each engine and emission requirements, both s...
by guhfluh
Fri Dec 06, 2019 12:04 am
Forum: 240-300 "Big Block" Six Performance
Topic: Another piston and connecting rod combination
Replies: 28
Views: 2075

Re: Another piston and connecting rod combination

the follow on logical question is : do spacers or shimming the rod end on its riding surface either the pin of crank, pose any potential problems? i mean is this a common solution to dimensional variance? if the LS world is available to us then we have truly found the pot at the end of the rainbow....
by guhfluh
Thu Dec 05, 2019 7:19 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Adjustable Vacuum Canistor for 300 4.9L
Replies: 25
Views: 1741

Re: Adjustable Vacuum Canistor for 300 4.9L

guhfluh -- As I am locater in CA lots of ignition parts are not found at our local parts stores because of the smog rules. Good part is my 1971 F250 300 4.9L is exempt (pre 1975). Where are you located? Can you get me a O'Reilly's Part number for an adjustable distributor vacuum advance canister li...
by guhfluh
Tue Dec 03, 2019 4:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Adjustable Vacuum Canistor for 300 4.9L
Replies: 25
Views: 1741

Re: Adjustable Vacuum Canistor for 300 4.9L

Mine came on my refurbished distributor I purchased through O'Reilly's for a 1968 F100 300. It is internally adjustable with an allen through the vacuum tube hole.
by guhfluh
Fri Nov 01, 2019 3:30 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3167

Re: How to add computer controlled timing

From what ive seen, For the TFI distributor, you have to wire the hall effect up to switched 12v power, ground(or Sniper green wire) and the Sniper trigger input(purple wire). Modify the reluctor wheel to have even vanes. Set everything else up as Holley suggests for their Dual Sync distributor. As ...
by guhfluh
Thu Oct 31, 2019 1:25 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3167

Re: How to add computer controlled timing

Ok. Help me out here, I’m getting hung up on this one... The f150s in 1996 that came with a 300 had sequential fuel injection and computer controlled spark. No crank trigger. Why is this any different? Signature PIP. A pattern at cam speed with at least enough pulses for each cylinder plus one diff...
by guhfluh
Thu Oct 31, 2019 12:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 2815

Re: Loss of compression in all cylinders

From what I see in the bore pictures, I see some detonation speckles, but I also see what appears to be ash and carbon deposit buildup from what I'd say is some oil ingestion. Oil contamination leads to preignition and detonation, so it's hard to say cause and effect, but I figured I'd throw in my o...
by guhfluh
Thu Oct 10, 2019 4:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intermittent miss
Replies: 16
Views: 1628

Re: Intermittent miss

I have tries to set the vacuum advance curve not quite sure I have it right. If I try to pass or get on it it stumbles and backfires on 4th and 5th gear Does it 'stumble and backfire' with the vacuum advance unplugged? I'm going to echo my post above, simply because I've seen this sooo many times s...
by guhfluh
Fri Oct 04, 2019 2:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lower EFI intake runner for performance?
Replies: 2
Views: 809

Re: Lower EFI intake runner for performance?

Anyone know the runner length and diameters of the EFI lower? The length is 9.88" +/- 0.10" and the I.D. at entry is 1.625". I have not measured the port dimensions. Thank you. That is close to what I estimated and unfortunately what I feared the ID was near. It seems to me that the ...
by guhfluh
Thu Oct 03, 2019 7:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lower EFI intake runner for performance?
Replies: 2
Views: 809

Lower EFI intake runner for performance?

Anyone know the runner length and diameters of the EFI lower? What is the effective head runner length/size to the back of the valve? What I'm curious about is the effective tuning RPM of just the lower and it's power potential or at what point it would become a restriction. I'm also interested in b...
by guhfluh
Thu Oct 03, 2019 7:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Carb Options For Offy Dual Plane on 240
Replies: 4
Views: 929

Re: Carb Options For Offy Dual Plane on 240

Anything is going to take some decent reworking of the factory linkage on a 72 to work sideways on a Dual Port manifold. What may work the best is a conversion to cable from a late 70's truck or something from Lokar that might convert the stock linkage.
by guhfluh
Thu Oct 03, 2019 6:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Y Pipe For EFI Exhaust Manifolds For 72 Model Year
Replies: 3
Views: 1024

Re: Y Pipe For EFI Exhaust Manifolds For 72 Model Year

The Walker Y pipes are crinkle bent and the merge angle isn't the greatest, but still reported to work well. In some they also have a lot of material blocking the merge section that wasn't cut out of the pipe before the other one that is merging in is welded on. People just reach in with a grinder a...
by guhfluh
Thu Oct 03, 2019 3:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Rebuild
Replies: 95
Views: 8264

Re: 300 Rebuild

Smart move, because if you have to go .060 over to clean the bores you may not have the cylinder wall thickness for it to work. I think .030 overbore is the normal max for a 300 block. Like you said don't waste money on a junk block. Your list of new engine parts sounds real good, good building. Na...
by guhfluh
Thu Oct 03, 2019 2:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intermittent miss
Replies: 16
Views: 1628

Re: Intermittent miss

Just a note here that may at least help it run better. The distributor you purchased probably does not have the correct ignition curve for a 1990 EFI headed 300. If you used the 1990 head on the engine when you swapped it into your truck, it probably needs a lot less advance curve under cruise and l...
by guhfluh
Sun Sep 22, 2019 3:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 P&C Distributor As A Spare
Replies: 7
Views: 1191

Re: Ford 240/300 P&C Distributor As A Spare

I noticed one of those links is an original new Ford/Autolite distributor that isn't rebuilt for about $120. Just in case you missed it.

I don't have a spare though. I wish I had kept my original load-o-matic instead of trading it in for a core.
by guhfluh
Sun Sep 22, 2019 3:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 1988 F-150: Hood latch modifications to fit huge intercooler
Replies: 6
Views: 761

Re: 1988 F-150: Hood latch modifications to fit huge intercooler

You should be fine without it, but bracing would be nice, as well as bracing with/through the intercooler.

Expect decreased A/C performance.

Go to advanced search