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Search found 214 matches

by Firepower354
Sun Jul 05, 2020 2:29 am
Forum: 240-300 "Big Block" Six Performance
Topic: Another idle contemplation -the 300 six "marinized" for watersport
Replies: 53
Views: 1017

Re: Another idle contemplation -the 300 six "marinized" for watersport

There's a big-ole-log 300 marine manifold on the 'Bay for $1000. Egad A Holset/Cummins marine water jacketed turbine housing should size up easy enough I haven't been in the belly of one lately, but unless there's room to move the bellhousing flange rearward, the balancer is going to run in to the s...
by Firepower354
Sat Jul 04, 2020 6:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Clifford 43-4502 4V 240/300 Intake Bolt Pattern ??????
Replies: 14
Views: 367

Re: Clifford 43-4502 4V 240/300 Intake Bolt Pattern ??????

I was finally able to get ahold Of Clifford Performance today. Tec guy said the bolt pattern in the intake is square 3 7/8" x 3 7/8". Will only fit their adapters. At $58 for one of their 4x2 adapters I think I will get another pc aluminum plate & build one. Their adapters are nice. A...
by Firepower354
Sat Jun 13, 2020 12:25 am
Forum: 240-300 "Big Block" Six Performance
Topic: "Conceptual 240"
Replies: 15
Views: 474

Re: "Conceptual 240"

All sorts of kooky extrusions are out there. Obviously too much restriction is bad, but it seems a very simple way to shed some heat.
Image
by Firepower354
Fri Jun 12, 2020 3:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: what have i done? water pump oddity
Replies: 9
Views: 426

Re: what have i done? water pump oddity

Looks like the EFI pump is like the volleyball coach, and goes both ways. 4 bolt flange and a threaded center.

Specsticles:
https://www.rockauto.com/en/moreinfo.ph ... 23&jsn=746
by Firepower354
Fri Jun 12, 2020 3:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: "Conceptual 240"
Replies: 15
Views: 474

Re: "Conceptual 240"

Turbo plain bearings need a decent flow of oil. Normal pressure line uses a 1.5mm restrictor, and large drain. My manifold came from a rear mount setup, and he'd used the mechanical fuel pump as an oil return/suction. Thermosiphon may be adequate for the water portion, but not oil. I'd suspect that...
by Firepower354
Tue Jun 09, 2020 8:47 pm
Forum: 240-300 "Big Block" Six Performance
Topic: "Conceptual 240"
Replies: 15
Views: 474

Re: "Conceptual 240"

Turbo plain bearings need a decent flow of oil. Normal pressure line uses a 1.5mm restrictor, and large drain. My manifold came from a rear mount setup, and he'd used the mechanical fuel pump as an oil return/suction. Thermosiphon may be adequate for the water portion, but not oil. I'd suspect that ...
by Firepower354
Mon Jun 08, 2020 9:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: "Conceptual 240"
Replies: 15
Views: 474

Re: "Conceptual 240"

Curious as to why a rear-mount turbo? None are all that difficult, but there are more obstacles. Oil needs to be pumped in both directions, without pooling in the housing too much Air filtration/ducting Inlet runner diameter, thus volume, sized for unrestricted 20psi flow, may give a little soggy th...
by Firepower354
Sun Jun 07, 2020 4:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 / 3 speed top loader.
Replies: 54
Views: 1112

Re: 300 / 3 speed top loader.

My DD is a 300 with a 3 speed Toploader.
Your trans and engine are fine, but you likely have the small bellhousing, ID method in link.
by Firepower354
Sun Jun 07, 2020 4:40 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

OK, so I got a used Dual-Port, and didn't like the fuel-wash patterns in the reversion area of the runners. I do not have a lot of room in the E350 bay, so I plan to use a 2v carb on an adapter plate. I don't like the way it appears that primary bores can short circuit to 3/4, while the primary plen...
by Firepower354
Sun Jun 07, 2020 3:56 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 / 3 speed top loader.
Replies: 54
Views: 1112

Re: 300 / 3 speed top loader.

Small flywheel bellhousing won't work on a 300.

http://www.mustangtek.com/sidebyside/Sm ... lsize.html
by Firepower354
Fri May 29, 2020 9:40 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cylinder heads valves and rockers
Replies: 41
Views: 4770

Re: Cylinder heads valves and rockers

I keep forgetting the oiling. Noted. Stock cam, just swapping to a small chamber head from a worn out open chamber, to see if it helps with the excess breather volume, and adds a little pep on what I'm figuring is a HD/low squeeze, non-catalyst, 8600 etc, and the compression wet and dry was pretty u...
by Firepower354
Fri May 29, 2020 3:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cylinder heads valves and rockers
Replies: 41
Views: 4770

Re: Cylinder heads valves and rockers

When you switch to rocker studs on the EFI head you need pushrod guide plates that mount under the rocker stud raising it up the plate thickness. Chances are if you use the Chevy six rocker you wont bottom out on the stud threads. The BBC rockers are .050" longer from stud to rocker tip and ne...
by Firepower354
Fri May 29, 2020 2:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Cylinder heads valves and rockers
Replies: 41
Views: 4770

Re: Cylinder heads valves and rockers

I've not been able to find these two answered:

EFI pedestal heads, converting to adjustable rockers, do the bosses need to be shortened?

With the higher ratio rockers, Chevy six only, or are the BBC ones usable? 3/8 vs 7/16 ball & nut determine my stud purchase.
by Firepower354
Fri May 29, 2020 10:24 am
Forum: 240-300 "Big Block" Six Performance
Topic: For those of you who were at Ford, when the boss 429...
Replies: 26
Views: 895

Re: For those of you who were at Ford, when the boss 429...

There were several different 429 Boss castings, chamber designs, and like Ford did, a bunch of experimentals. Jon Kaase has revised a few things and offers incredible horsepower from his Boss 9 packages. Dove, similarly kept the SOHC alive, buying the tooling after Ford was done. Robert pond has som...
by Firepower354
Sun May 24, 2020 1:13 pm
Forum: Orphan Inlines
Topic: need some input
Replies: 14
Views: 548

Re: need some input

AJ6/16 seems decent. Only .050 more bore spacing than the Small Six Or, the quirky 3.7L Mercruiser four? With an aluminum 460 head, it's absurdly light and makes decent power. Stroker 460 method of offset grind for BBC rods puts them in the 4L range, if one wanted. 4200 GM Atlas/Vortec is way too ta...
by Firepower354
Tue May 19, 2020 4:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 HD heavy duty exhaust manifold
Replies: 80
Views: 35655

Re: 300 HD heavy duty exhaust manifold

Mine just uses a flat gasket like a header collector, and the flange is welded to the pipe. No squeaks. No leaks.
by Firepower354
Mon May 18, 2020 4:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Aussiespeed Manifold
Replies: 4
Views: 581

Re: Aussiespeed Manifold

With the Aussiespeed, one could contact Mark. He's typically pretty friendly. The Offy DP I picked up had some interesting patterns from reversion vs fuel wash. Lots of clean alloy in the lower center runner floors, outside corner of the 2/5, less in 1/6 but still obvious. The exhaust heat pocket ex...
by Firepower354
Mon May 18, 2020 4:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 HD heavy duty exhaust manifold
Replies: 80
Views: 35655

Re: 300 HD heavy duty exhaust manifold

Ok diggin up bones. Can someone supply a link to a flange that will fit the 3 bolt HD manifold or at least the dimensions. My Roadster is 40 miles away so I cannot measure mine! My searches come up dry! Jim The relief on my HD manifold accepts the 2-1/2 pipe. Flange bolts close to 3-1/4 apart. Driv...
by Firepower354
Thu May 14, 2020 7:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

Erson Cams E270121 (TQ20H) .478"/.478" 214/214 292/292 111deg. The actual .006 duration is closer to 280 degrees which will keep the DCR low If you go with a larger intake valve you can still move the chamber wall back some while keeping it tight to the valve. The exhaust can be opened up...
by Firepower354
Thu May 14, 2020 7:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

I have a floor shifter and the linkage arms for a T170 out of an 83 econoline (with a 300) on a shelf in my shop. Already sold the clutch pedals and linkage, but you dont need that anyways. Lemme know if this is something that interests you. For the engine, the pcv system is what sounds like is the...
by Firepower354
Thu May 14, 2020 7:19 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

...If I can get 70cc and not hurt the swirl too bad, that puts me in the 9.3 range... Swirl is generated - generally speaking - if the mask clearance to the edge of the valve is between 1.5 and 3 mm. Opening it up beyond 3mm will effectively diminish the fast burn effect. Beyond 3mm you'll have to ...
by Firepower354
Wed May 13, 2020 11:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

Those are great, and if I could get one that had substantially less material removed from the deck face, and everything else staying the same compared to the valve cover rail, I'd be all over it. But I already have two EFI heads, and they should suffice. If I can get 70cc and not hurt the swirl too ...
by Firepower354
Wed May 13, 2020 8:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

pmuller9 wrote:I wasn't aware that the EQ head isn't available. What's the story?


Sorry, I meant in a larger chamber version, via leaving material on the deck face.
by Firepower354
Wed May 13, 2020 7:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

The EFI head with the shrouded intake valve will get you the best gas mileage because of the swirl but it's not the best for power. If you unshroud the intake valve you lose swirl but will increase flow below .350" valve lift significantly. An unshrouded EFI head can easily have a 70cc chamber...
by Firepower354
Wed May 13, 2020 6:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

I have a floor shifter and the linkage arms for a T170 out of an 83 econoline (with a 300) on a shelf in my shop. Already sold the clutch pedals and linkage, but you dont need that anyways. Lemme know if this is something that interests you. For the engine, the pcv system is what sounds like is the...
by Firepower354
Tue May 12, 2020 6:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

Re: 300 mileage/torque build

Are you saying the engine that is running and losing oil has the Chevy 392 rods and short pistons and EFI heads? Please excuse my confusion. Nah, it's poorly written. My stream of consciousness writing... The stock 82 engine is the one that is pushing oil out. It's not burning any. The pistons are ...
by Firepower354
Tue May 12, 2020 3:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 mileage/torque build
Replies: 21
Views: 825

300 mileage/torque build

After a few road trips where I nudged up past my typical 55, it's clear that the oil just isn't going to stay inside. Small RV/big van, 1982 E350 based, stripped, under 6000lbs. 3 on the tree, 3.55 Sterling, 235/85-16s It has a HD manifold and nice 2-1/2 exhaust that I added, otherwise it's complete...
by Firepower354
Tue May 12, 2020 1:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 300 6 cylinder rebuild
Replies: 6
Views: 476

Re: Ford 300 6 cylinder rebuild

The Offy intake should have two ports on the outside of the plenum.

A pair of 3/8 pipe to 5/8 hose 90 fittings and a scrap of metal, and you can make the water plate for under $10

Depending on your chassis, there are some nice high flow pipes. And the Walker...
by Firepower354
Sun May 10, 2020 9:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 300 6 cylinder rebuild
Replies: 6
Views: 476

Re: Ford 300 6 cylinder rebuild

Watch interference between manifolds, and assemble.
Water heat plate is usually used to improve drive-ability.
viewtopic.php?t=73730
by Firepower354
Sun May 10, 2020 4:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Edelbrock DP Modification
Replies: 29
Views: 4893

Re: Edelbrock DP Modification

I just dragged home an 87 300 with a Dual Port that had a 1.08 2100 on an open adapter. I see no real need to mill the whole center out., especially if stacking open spacers. Reversion black washed away in the corners, tell me it was marginally effective, and he noted it lacked power. It did have a ...
by Firepower354
Sun May 10, 2020 4:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Need Rebuildable Autolite 2100/2150 Carb
Replies: 3
Views: 360

Re: Need Rebuildable Autolite 2100/2150 Carb

I have three 1.08s and one each 1.14 and 1.21
Will PM
by Firepower354
Fri May 01, 2020 10:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Next build phase-Intake and ignition
Replies: 72
Views: 6483

Re: Next build phase-Intake and ignition

The starter solenoid would be the likely spot, so it gets 12v during cranking, but not run. The general consensus is that you need to GROUND the fifth pin to engage the timing retard. That being said, there are references to two variations of the 5-pin module, one which needs +12 V on the fifth pin...
by Firepower354
Wed Apr 29, 2020 4:47 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Next build phase-Intake and ignition
Replies: 72
Views: 6483

Re: Next build phase-Intake and ignition

The starter solenoid would be the likely spot, so it gets 12v during cranking, but not run.

Ground, not 12v. Memory slip... :oops:
by Firepower354
Tue Apr 28, 2020 8:56 am
Forum: 240-300 "Big Block" Six Performance
Topic: Next build phase-Intake and ignition
Replies: 72
Views: 6483

Re: Next build phase-Intake and ignition

1894308 GM module has a 5th pin for a retard function, that was tied to the OE primitive ESC. Turbo builds have used it with a pressure switch, and I may add a dash switch in case I get a knock-prone fuel/environment/load combo. 10474610 heat sink from LT1 cars looks to be suitable. It mounts to a b...
by Firepower354
Tue Apr 21, 2020 11:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Planning build: 300 in a 1985 E350 Quadravan
Replies: 50
Views: 2320

Re: Planning build: 300 in a 1985 E350 Quadravan

I kinda think the Elgin and Mellings are the same 204/214 RV grind, same lobes as used across the board. .420/.442 on SBC, a few thou advertised to appear unique is my guess. I was shocked to see the 220 degree number, glad to see that sorted. How are these Y-pipes? I kinda prefer the smoother bends...
by Firepower354
Wed Apr 08, 2020 11:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Long intake runner on factory manifold
Replies: 31
Views: 1780

Re: Long intake runner on factory manifold

If the stock Carter has a 40mm venturi, could one reason that a different 40mm carb that has jetting capabilities, would work? https://www.ebay.com/itm/CV-40mm-Carburetor-For-Harley-Davidson-CV40-Road-King-Super-Glide-Fatboy-Touring/362950163172?fits=Make%3AHarley-Davidson&hash=item548183fae4:g:...
by Firepower354
Wed Mar 25, 2020 2:05 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Turbos and. Fords
Replies: 8
Views: 1946

Re: Turbos and. Fords

Conversions:

To make each 100 hp

Different sources use different figures. The four below are most common, and are expressing the same amount of air, essentially.
150 cfm
12.105 lb/min
.0708 m3/sec
.0917 kg/sec
by Firepower354
Wed Mar 25, 2020 1:56 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Turbos and. Fords
Replies: 8
Views: 1946

Re: Turbos and. Fords

by Firepower354
Tue Mar 17, 2020 2:52 am
Forum: 144-250 "Small Block" Six Performance
Topic: Alternative 200 six connecting rod
Replies: 52
Views: 14693

Re: Alternative 200 six connecting rod

I don't find the 2018 update, but the 2006 one is one of my favorites for oddball research.
Feel free to delete if covered elsewhere.
http://www.guiaautomotrizcr.com/images/ ... manual.pdf

And of course the piston specs.
https://uempistons.com/c-29-silv-o-lite.html
by Firepower354
Mon Mar 16, 2020 1:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust manifolds
Replies: 20
Views: 3600

Re: Exhaust manifolds

Adding a couple more 1v carbs, and Jet Hot coating the inside of both cavities, has been in my mind for a decade, see post #21 in the "Intake Manifolds" thread. Yep, but that only addresses the "easy" part of what the uni-log fixes. I dig the solid single flange and one-piece-ed...
by Firepower354
Mon Mar 16, 2020 11:24 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust manifolds
Replies: 20
Views: 3600

Re: Exhaust manifolds

I just ran across this and thought of this thread [as well as the intake manifold thread]. https://www.ebay.com/itm/ECON-O-POWER-MARINE-WATER-COOLED-EXHAUST-MANIFOLD-FORD-240-300-CID-USED/223769830463?hash=item3419b8a43f:g:h0MAAOSwX-Zd3rZc I've been watching that but it's about 4x more than I could...
by Firepower354
Sun Mar 15, 2020 5:03 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Turbos and. Fords
Replies: 8
Views: 1946

Re: Turbos and. Fords

I'm sure I'm oversimple in thinking a 2.5L engine that zings 7000 should want about the same as a 5.0L at 3500? It would be true if the Volumetric Efficiency (% of cylinder fill) is the same for the 2.5l engine at 7000 rpm as it is for the 5.0l engine at 3500 rpm. The stock 300 six has a peak VE be...
by Firepower354
Sat Mar 14, 2020 12:31 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI on factory intake? Dependability?
Replies: 31
Views: 2797

Re: EFI on factory intake? Dependability?

The HD manifold doesn't have a heat-riser plate, but is open to the intake base all the time. I wonder if it's a vapor lock issue? Modern fuel sucks, and winter blend vapor point could be letting the bowl "boil" out? My HD manifold was welded shut with a plate by the PO. Driveability isn't...
by Firepower354
Sat Mar 14, 2020 11:53 am
Forum: Turbo, Supercharger, and Nitrous
Topic: Turbos and. Fords
Replies: 8
Views: 1946

Re: Turbos and. Fords

Mostly to mark my spot... I've been struggling with that complex matrix of turbo selection as well. Compressor needs to flow a certain amount of air to meet power goal, at a boost level it can survive. Turbine needs to spin fast enough to build boost in the desired range, but not create excessive re...
by Firepower354
Mon Mar 02, 2020 11:40 pm
Forum: Orphan Inlines
Topic: Mercury marine 165hp six
Replies: 4
Views: 4935

Re: Mercury marine 165hp six

For sure 250 I6 Chevy. Slightly hotter cam, and some had cast valve covers, fewer had cast lifter covers.
by Firepower354
Mon Mar 02, 2020 10:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY
Replies: 22
Views: 2354

Re: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY

I'm not sure how the pushrod angle would be a factor. Moving the pivot back toward the pushrod, while reducing the distance from pushrod to fulcrum, and optimizing pushrod length. I'll have to look at the drawings later tonight. You loose valve lift and possibly create oiling hole misalignment. By ...
by Firepower354
Mon Mar 02, 2020 2:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY
Replies: 22
Views: 2354

Re: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY

I'd meant, to have the same net valve lift, and potentially more dwell at full open, compared to a similar lower ratio cam. I'm not sure how the pushrod angle would be a factor. Moving the pivot back toward the pushrod, while reducing the distance from pushrod to fulcrum, and optimizing pushrod leng...
by Firepower354
Mon Mar 02, 2020 10:59 am
Forum: 240-300 "Big Block" Six Performance
Topic: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY
Replies: 22
Views: 2354

Re: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY

Interesting. So 1.590 is the pivot length on the BB6? Close enough. There is variation even on the same head. I have measured 1.585" Are the valve stem and rocker stud parallel? Close. Next chance any of us get to measure a head one of us should check the angle. When milling for screw in studs...
by Firepower354
Thu Feb 27, 2020 9:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY
Replies: 22
Views: 2354

Re: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY

On a 300 six if you use rocker arm that has a little more length (.010") than the fulcrum to valve stem center, the rocker will be 90* to the valve stem at 1/2 valve lift which is where minimum rocker roller tip travel occurs. (Harland Sharp) At .500" total valve lift that travel distance...