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Search found 820 matches

by MechRick
Mon Feb 27, 2012 4:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 into my 1971 crewcab f250
Replies: 55
Views: 9721

Re: 300 into my 1971 crewcab f250

I think you will be fine as far as fuel distribution. You might have issues with the pump shot, though. I ran into this a few years ago when setting up an intake for a 2.3L Ford. The common dirt track setup was an adapter plate on top of the lower half of an EFI intake. The result was much like what...
by MechRick
Thu Feb 23, 2012 2:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Those with 4x4 F250s, opinions please.
Replies: 37
Views: 6007

Re: Those with 4x4 F250s, opinions please.

Don't know what it is, but all the FE's seem to drink fuel. If I were in your shoes, it would be 6.9L IDI all the way. Gear it into it's sweet spot for economy (1800-2000 RPM) maybe install some Stan's headers (http://www.stans-headers.com/Photos/269.jpg). That would be your best bet for economy. 5....
by MechRick
Fri Feb 17, 2012 7:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 EFI head on older block
Replies: 7
Views: 4150

Re: 300 EFI head on older block

The use of a carb head on a street vehicle that will rarely see more than 4000-5000 isn't really necessary. The EFI head would work fine on such an engine. The intake valve shrouding does not reduce flow as much as many people think. From my days with Ford, I remember the instructors telling us that...
by MechRick
Fri Feb 17, 2012 4:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 into my 1971 crewcab f250
Replies: 55
Views: 9721

Re: 300 into my 1971 crewcab f250

In my Bronco: engine #1) 351 windsor HO (stock) C6 trans 12mpg engine #2) 351 Cleveland, performer/edelbrock 600 C6 12mpg engine #3) Explorer 5.0 (stock roller cam, GT40P heads) C6 12mpg Engine #4) 1996 4.9L pocket-ported, stock valves, Comp 268H, C6 14.4 mpg Same as above with ZF 5-speed (.76 OD) 1...
by MechRick
Thu Feb 02, 2012 11:56 am
Forum: 240-300 "Big Block" Six Performance
Topic: Spark Plug Issues
Replies: 6
Views: 1533

Re: Spark Plug Issues

I'm curious when you say "completely shorted" on the center electrode. In practice, I've never seen this. I look for somewhere around 5k ohms on suppressor plugs and something a bit less with resistor plugs. Spark plug wires should be 2k to 4k ohms per foot. Maybe I've been away from point...
by MechRick
Tue Jan 24, 2012 5:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hedman header gasket
Replies: 4
Views: 1142

Re: Hedman header gasket

Well, I'll have to delay the exhaust installation for a while... http://i1109.photobucket.com/albums/h438/pilot42/crash1.jpg http://i1109.photobucket.com/albums/h438/pilot42/crash2.jpg http://i1109.photobucket.com/albums/h438/pilot42/crash3.jpg ...the sheet metal damage is extensive. More than I wan...
by MechRick
Wed Jan 18, 2012 10:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hedman header gasket
Replies: 4
Views: 1142

Hedman header gasket

I've just finished sandblasting my header and applying two coats of POR 20. Saturday I'll try to get the header installed and the a/c bracket modified. I've been eyeballing the paper gasket that Hedman sends in the box. Should I use it, or is it a bad idea? The entire system will be 2" duals us...
by MechRick
Wed Jan 18, 2012 12:15 pm
Forum: 240-300 "Big Block" Six Performance
Topic: What is the pcv valve type thing on the thermostat housing?
Replies: 8
Views: 1838

Re: What is the pcv valve type thing on the thermostat housing?

All of the vacuum diagrams I can pull up for '82 300's show a 4 port vacuum control valve. Are you sure the year of the engine is the same as the truck? Regardless, the e port (usually the closest to the threaded portion of the valve) goes to the e nipple on the carb. The other ports go to either a ...
by MechRick
Sun Jan 15, 2012 4:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: lopey cams
Replies: 10
Views: 3239

Re: lopey cams

Mine does. Idle speed is critical. I can almost tune the lope out of it above about 850 rpm.
by MechRick
Sat Jan 14, 2012 12:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: E-85
Replies: 43
Views: 5380

Re: E-85

Your points are all valid. When I use the word 'alternative', I mean an indefinitely sustainable fuel that can still be produced when all of the crude, CNG and coal have *run out*. Gasoline makes great fuel because it is easy to store, relatively safe and cheap. The closest substitute that will drop...
by MechRick
Sat Jan 14, 2012 12:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: lopey cams
Replies: 10
Views: 3239

Re: lopey cams

I've been running the 268h for a couple years. I like it. Just drop it in with new lifters and the stock springs and go. It's a flat tappet cam with fairly aggressive ramps, though. Break-in is crucial. Use the supplied moly on the lobes, zinc additive in the oil, and run it at 2000 rpm+ for 20 minu...
by MechRick
Sat Jan 14, 2012 1:22 am
Forum: 240-300 "Big Block" Six Performance
Topic: lopey cams
Replies: 10
Views: 3239

Re: lopey cams

A lot of factors go into whether a cam will cause an engine to lope or not. Lope at idle is caused by mixture dilution from exhaust bleeding back into the combustion chamber during valve overlap. My engine has the Comp 268h which has 219 degrees of duration at .050" valve lift. Overlap is 48 de...
by MechRick
Thu Jan 12, 2012 3:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 470 truck avenger on 300?
Replies: 10
Views: 3145

Re: 470 truck avenger on 300?

Comparing to pictures of an older upper, the runners appear straighter and there are bung castings close to the upper/lower mounting surface. Almost looks like Ford was considering CNG or propane injection or something.

Also, the plenum is divided front 3 to rear 3 cylinders. Typical?
by MechRick
Wed Jan 11, 2012 5:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 470 truck avenger on 300?
Replies: 10
Views: 3145

Re: 470 truck avenger on 300?

F250 Restorer: Do you use a spreadbore adapter to mate the Q jet to your intake? I've been toying with the idea of gathering a CCC quadrajet, harness, sensors and ecu from a mid '80s V6 GM car and bolting it to my DP intake. I've always been a quadrajet fan, and have heard they work well at extreme ...
by MechRick
Tue Jan 10, 2012 6:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Another head porting thread...
Replies: 6
Views: 1790

Re: Another head porting thread...

You must be driving the clone to my Bronco...did you have to body lift it to get the ZF to fit? My concern with your setup is the compression. Mine will ping a bit with 8.7:1 that the EFI head gives on 87 octane. I think fuel distribution issues with the DP is causing it because it sounds like one c...
by MechRick
Thu Jan 05, 2012 7:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: cutting larger valves in efi head w/carb
Replies: 18
Views: 36626

Re: cutting larger valves in efi head w/carb

The EFI head chamber design goes back to the 1984 Tempo HSC (high swirl combustion) head. It was originally designed for non-crossflow heads, but was also used on 2.3L Lima Ford engines... http://i1109.photobucket.com/albums/h438/pilot42/chamberview.jpg And 1986 5.0L Mustangs... http://i1109.photobu...
by MechRick
Thu Jan 05, 2012 4:52 pm
Forum: big six
Topic: Stock 300 camshaft specifications
Replies: 26
Views: 21037

Re: Stock 300 camshaft specifications

I realize this is an old thread, but... The stock 300 six/4.9 efi cam has quite a bit of advertised duration (~268) but the ramps are very mild. I assume this is for longevity more than anything else. When building my 4.9, I was initially going to use a Comp 260H. When I discovered (on this forum) t...
by MechRick
Thu Jan 05, 2012 4:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: E-85
Replies: 43
Views: 5380

Re: E-85

I hear lots of people bash ethanol as a fuel, but the truth is it's the best alternative to petrol we have. It won't solve all the problems, as the U.S. simply doesn't have the farmland to produce enough of it to power the 250 million + vehicles we have, but at least we don't have to buy as much cru...
by MechRick
Thu Jan 05, 2012 12:27 am
Forum: 240-300 "Big Block" Six Performance
Topic: EVAP: Hardware present, test disabled?
Replies: 4
Views: 1222

Re: EVAP: Hardware present, test disabled?

If I remember correctly, '96 F150 with sixes do not run an evap monitor. I remember scanning mine, and the evap flags would always show 'not available'.
The trucks still have the purge valve and canister, but no leak test is run.
by MechRick
Thu Jan 05, 2012 12:19 am
Forum: 240-300 "Big Block" Six Performance
Topic: E-85
Replies: 43
Views: 5380

Re: E-85

I'll chime in here, since I've done this with a turbo 2.3 Mustang. E85 works great in performance vehicles, because it has an effective octane rating of 105 (actual octane number is a few points lower, but ethanol runs cooler than petrol, so the effective rating is a bit higher). You can run substan...

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