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Search found 669 matches

by F-250 Restorer
Sun Jul 14, 2019 11:35 am
Forum: 240-300 "Big Block" Six Performance
Topic: Offenhauser DP to Clifford heating difference.
Replies: 2
Views: 87

Offenhauser DP to Clifford heating difference.

I changed from a Offy DP to a Cliff. intake. Both have the engine coolant flowing through them. I changed the intake and engine a couple of months ago, so I've been playing with/adjusting the choke to get it right. However, with the Cliff. intake, using the same holley carb as was on the Offy, I fin...
by F-250 Restorer
Sun Jul 14, 2019 11:14 am
Forum: 240-300 "Big Block" Six Performance
Topic: Edelbrock avs2 1901
Replies: 5
Views: 232

Re: Edelbrock avs2 1901

I have been reading about vapor lock. There are a few vids on youtube about resolving the issue. Much of the problem is from fuel being heated up while standing still in the lines. Some of the owners have installed a fuel return system, so new, cooler, non boiling fuel is pushed through when the eng...
by F-250 Restorer
Wed Jul 10, 2019 8:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Edelbrock avs2 1901
Replies: 5
Views: 232

Re: Edelbrock avs2 1901

I ran a Hedman long tube header with a DP intake. That put the primaries right over the header. I tried an Autolite 4100 and the Summit carb. Both had heat problems in summer. I even tried an aluminum sheet heat shield, which didn't help. Now that I've switched to a C intake with Clifford shorty hea...
by F-250 Restorer
Tue Jul 09, 2019 11:03 am
Forum: 240-300 "Big Block" Six Performance
Topic: Edelbrock avs2 1901
Replies: 5
Views: 232

Edelbrock avs2 1901

I wonder if anyone is running this carb. And, if so, do you have a header? I had heat problems in the past and wanted to find out if others are having this problem with this carb. I'm impressed with this carburetor. It has taken two classic carbs and taken the best from each and combined them: The f...
by F-250 Restorer
Wed Jul 03, 2019 1:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Tuning my Holley 390. The saga continues.
Replies: 28
Views: 4974

Re: Tuning my Holley 390. The saga continues.

The last post by the author of this thread was dated 2011.
by F-250 Restorer
Sun Jun 23, 2019 2:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Vacuum Secondaries
Replies: 27
Views: 1219

Re: Vacuum Secondaries

Nice to see this topic is still active. The small primaries in a quadrajet carb are a real asset for good drivability to pull hard at low rpm. Many QJ's had a by-pass air system. Rochester and GM found that with the tiny primaries, when they were placed on engines drawing a certain amount of air, t...
by F-250 Restorer
Tue Jun 18, 2019 10:19 am
Forum: 240-300 "Big Block" Six Performance
Topic: Offenhauser VS Clifford
Replies: 16
Views: 1124

Re: Offenhauser VS Clifford

I just wanted to add that r & r'ing a starter with the Hedman header is not impossible. I have a 75 F250 with a 300 in it. I used C clamps to pry the header tubes/collectors a bit, but everything was fine. With the new engine I used an efi era small starter, even though I'm now running Clifford ...
by F-250 Restorer
Wed Jun 12, 2019 11:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Vacuum Secondaries
Replies: 27
Views: 1219

Re: Vacuum Secondaries

Anyone have experience with a 450 double pumper? I need to decide on my induction soon, so this thread is of the highest importance at this point for me. 10:1 Schneider 142F 300 rods I have two Carter BBD (285 cfm) carbs that are an option to a 4 barrel mechanical. The 450 double pumper is a distin...
by F-250 Restorer
Mon Jun 10, 2019 12:22 am
Forum: 240-300 "Big Block" Six Performance
Topic: Vacuum Secondaries
Replies: 27
Views: 1219

Re: Vacuum Secondaries

I have run ten different carbs, from 465 to 800 cfm. All but one, the 465 Holley, were run exclusively with a c6 and a small rv cam. Of those I have to say that the 500 Eddy and the 600 cfm Summit produced the best driveability. The performance provided by the 600 Summit, was in a class of its own. ...
by F-250 Restorer
Sun Jun 09, 2019 5:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Vacuum Secondaries
Replies: 27
Views: 1219

Re: Vacuum Secondaries

The CFM requirement of the 300 is low... maybe 175 CFM at 2000 RPM. That would make sense. The 750 cfm Quadrajet flow 180 cfm on the primary side, and that was used on small and big block engines. The 800 cfm Quadrajet flowed about 210 cfm on the primary side. That would seem to indicate that small...
by F-250 Restorer
Fri Jun 07, 2019 12:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Which mini starter for an old 300.
Replies: 8
Views: 400

Re: Which mini starter for an old 300.

I use an efi starter on my 75 300. With both a c6 and a ZF5 behind the same motor, I had to space the starter from the mount with two washers between the block and the starter on each mount bolt. Unless you have headers, I would stick with the old style. Rebuilds for the old style are half the price...
by F-250 Restorer
Fri Jun 07, 2019 12:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Offenhauser finned side and Valve cover
Replies: 0
Views: 270

Offenhauser finned side and Valve cover

I have a friend with a 300 hotrod that he takes to shows. He said the Offy rep told him that Offenhauser is about to release a finned side cover for the 300, and that a finned v. cover will follow. Hoorah.
by F-250 Restorer
Thu Jun 06, 2019 11:47 am
Forum: 240-300 "Big Block" Six Performance
Topic: Seeing is Believing: LS1 into crossflow 300
Replies: 14
Views: 921

Re: Seeing is Believing: LS1 into crossflow 300

I wonder if those Quadrajets are the 800 or 750 cfm models? Either way, that puts the primaries of both carbs at about 400cfm. The 800 cfm model came oem on a 231ci v6! Talk about versatility.
by F-250 Restorer
Thu Mar 14, 2019 12:11 am
Forum: 240-300 "Big Block" Six Performance
Topic: Harland Sharp roller rockers
Replies: 8
Views: 544

Re: Harland Sharp roller rockers

Tomorrow I start the new engine for the first time. Pmuller, I want to thank you for leading me the entire time, years, through the Blondie cam talks, helping me comprehend how a cam works, and so many other aspects of my build, from the 351w pistons, to the 67 rods, the r.rocker issue, adjusting th...
by F-250 Restorer
Mon Mar 11, 2019 1:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Harland Sharp roller rockers
Replies: 8
Views: 544

Re: Harland Sharp roller rockers

I agree with pmuller9, sounds like the stud top thread is not clean. With the rocker removed you should be able to run your poly lock all the way down by hand. You may have all ready made sure the polylock nut threads are OK. If the problem is the top threads you can chase them with a die even thou...
by F-250 Restorer
Sun Mar 10, 2019 4:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Harland Sharp roller rockers
Replies: 8
Views: 544

Re: Harland Sharp roller rockers

That is not normal. The nut has to have consistent inside tread in order for the set screw to work smoothly so something else is wrong. If you take the set screw out the nut should screw all the way down till the stud runs out of thread. If it gets tight along the way then the stud threads have a p...
by F-250 Restorer
Sun Mar 10, 2019 3:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Harland Sharp roller rockers
Replies: 8
Views: 544

Harland Sharp roller rockers

I have a new set of HS 3/8 stud roller rockers. They set right on the stud, but I notice that the nuts tighten up after just a few turns, before the nut hits bottom on the rocker mounting shaft. And that is with the Allen lock backed out. Is that normal? Are they designed to be tight like that so th...
by F-250 Restorer
Thu Feb 14, 2019 11:06 am
Forum: 240-300 "Big Block" Six Performance
Topic: Carb options
Replies: 33
Views: 2087

Re: Carb options

I have used the Summit carb on my truck. I was running a Hedman header and a DP intake which put the primary bowl right over the header, and I could not resolve the boiling fuel issue. I tried a heat shield, wrapping the fuel line, turning the carb around, all while using the insulating thick gasket...
by F-250 Restorer
Sun Feb 03, 2019 12:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 l6 EFI rebuild
Replies: 3
Views: 518

Re: 300 l6 EFI rebuild

The best way to learn about how to proceed with your build is by doing a search on this forum and Ford Truck Enthusiasts. Read, copy/paste, take notes, read more, just like a school project, and then proceed. Confirm what people say with multiple forum members or sources. Good luck. I have an Iskida...
by F-250 Restorer
Sun Feb 03, 2019 12:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: What ignition system?
Replies: 10
Views: 832

Re: What ignition system?

I have used 5 ignition systems: stock points, MSD 6A (before they went digital), the Summit box (the stronger of the two, when they made two), the GM 4 pin, and an MSD 6A digital. I liked the performance of the MSD the best. The 4 pin is a step down in pep, noticeable. I do, however, keep a 4 pin in...
by F-250 Restorer
Sun Feb 03, 2019 12:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Holley Carb left turn stumble or stall!
Replies: 23
Views: 1391

Re: Holley Carb left turn stumble or stall!

So, am I the only one that can't figure out what 'new set-up' means? I'm sorry, but I see where you said 'easy fix in two hours,' but does that mean that changed the position of the pump cam, got a new one, or acquired a new carb?
by F-250 Restorer
Thu Jan 31, 2019 11:08 am
Forum: 240-300 "Big Block" Six Performance
Topic: Priming Oil system/pump
Replies: 5
Views: 469

Priming Oil system/pump

To prime the oil system I simply insert the proper size hex shaft down through the dizzy inlet and into the oil pump, and turn it carefully with a drill, right?
by F-250 Restorer
Fri Jan 18, 2019 9:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

I think maybe the block was still cold from the night, since it was morning. That is fascinating the with calipers. I didn't know that.
I was using Plastigauge.
by F-250 Restorer
Thu Jan 17, 2019 11:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

I did not ck the cam because the tale involves one block and 2 new cams. Each cam had trouble entering the same journal in the block. **Guys, I have to mention something you may find interesting or already know. So, about 4 days ago when the temp was about 12* warmer here, I measured in the afternoo...
by F-250 Restorer
Thu Jan 17, 2019 9:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

If those clearances bug you run a HV oil pump. One of the reasons for pulling my engine was that I had to use 20/50 oil to get 10psi, with a HV pump. I want to be able use normal oil w/o a hv pump, and maintain good oil psi. Btw, what do you guys think of my pan with clear on it? https://i.imgur.co...
by F-250 Restorer
Thu Jan 17, 2019 9:10 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

Interesting about using under-sized and standard size bearing, mixing them. The problem I have with the new block is that the book says iirc .0005--.0015 for the mains. I measure larger than that. But that is not a problem. I'll just swap the crank and bearings back to the first block where the tole...
by F-250 Restorer
Wed Jan 16, 2019 11:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

Sealed power makes a set of undersize bearings, main bearings, for the three hundred. I found them on rock auto,.001 under the standard size. Well I guess the three hundred doesn't like me. Today I took the rotating assembly out of the first block with the misaligned cam. I guess what the other foru...
by F-250 Restorer
Wed Jan 16, 2019 10:24 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

pmuller9 wrote:Is the other block already 4.030" bore?

Yes.
by F-250 Restorer
Wed Jan 16, 2019 9:56 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

pmuller9 wrote:Is the main line for the crank straight?


It seems to be. The crank spins easily.
I guess the only way to be certain that the engine is good is to abandon this block and use the other one. OK. That is what I'll do today.
by F-250 Restorer
Tue Jan 15, 2019 11:58 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

I pulled the cam out. Then I tried it in only three of the journals, and then in two. What I found was that it seemed to get difficult to turn as the cam entered the rear side of a couple of the journals. So I decided to just take some four hundred wet and dry sandpaper and sand that area on those j...
by F-250 Restorer
Mon Jan 14, 2019 11:07 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

Thanks for all the suggestions and feedback. The journal is misaligned. The cam hits on the bottom of the bearing. If I do anything to remove some of the bearing surface and allow the cam to spin freely, that means there is that much play/gap on the other side of the bearing. If I remove .001-.002&q...
by F-250 Restorer
Mon Jan 14, 2019 1:26 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

Thanks, I will ck all that. I saw that the cam was hitting the bottom of the bearing, so I chamfered the edge and sanded the bearing with 400 w/d sand paper, and then was able to slide the cam in. I'm guessing I should have sanded a bit more? until the cam is easy to turn? I have a 'spare block with...
by F-250 Restorer
Mon Jan 14, 2019 12:39 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

Good point. I will check, but I'm pretty sure the bearing is touching all the way around. It has done this with two sets of cam bearings, the second set purchased and installed by a machine shop so I could make sure I had it right.

Should a cam be stiff to turn?
by F-250 Restorer
Mon Jan 14, 2019 12:23 am
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

Re: misaligned block cam journal

I have the earlier block, so the later bearing choice would not affect the insertion of my cam. The ID would be the same, right.

If the cam is tight as it is, am I making a mistake by proceeding with this block?
by F-250 Restorer
Sun Jan 13, 2019 11:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: misaligned block cam journal
Replies: 33
Views: 1612

misaligned block cam journal

Hey guys. The second cam journal in my block is slightly out of alignment. I had to chamfer the leading edge of the bearing to get the cam to slide in. Once in, I could feel it was tight/stiff to rotate. Installed all the way, with both hands holding the cam gear, it is stiff to rotate. Am I making ...
by F-250 Restorer
Sat Jan 12, 2019 12:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: I bought a used zf5-42 for my 1984 f-150
Replies: 21
Views: 1206

Re: I bought a used zf5-42 for my 1984 f-150

I have a thread going on Ford Truck Enthusiasts forum, in the 73-79 section, about putting in a zf5, and all the small stuff that is needed. The thread is: C6 to zf5, and all the small stuff. Or, search posts by F250 Restorer. You might find it useful. The first thing you need to do is determine whe...
by F-250 Restorer
Tue Dec 25, 2018 11:56 am
Forum: 240-300 "Big Block" Six Performance
Topic: Enlarging the Combustion Chamber?
Replies: 8
Views: 742

Re: Enlarging the Combustion Chamber?

Maybe I just need a bit of info/clarification. With a 70cc chamber, I come up with a dcr of 7.39. Is that going to cause pinging/issues with the low grade fuel? Pmuller: I just wondering why it would be better to expand the chamber with a curved area, following the radius of the valves, rather than ...
by F-250 Restorer
Mon Dec 24, 2018 7:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Enlarging the Combustion Chamber?
Replies: 8
Views: 742

Re: Enlarging the Combustion Chamber?

Thanks for the note. I'll try to recheck. I have the cheap type, but it works. It took a few practice runs, but I figured it out. I do have to admit that yours certainly looks sharp. I wasn't aware that polishing takes off quite a bit of material.
by F-250 Restorer
Mon Dec 24, 2018 2:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Enlarging the Combustion Chamber?
Replies: 8
Views: 742

Re: Enlarging the Combustion Chamber?

If you have that image handy of the chamber that you did like that, can you please post it again?
by F-250 Restorer
Mon Dec 24, 2018 11:04 am
Forum: 240-300 "Big Block" Six Performance
Topic: Enlarging the Combustion Chamber?
Replies: 8
Views: 742

Enlarging the Combustion Chamber?

Having scribed the cylinder circle onto the head from the block, I found that I am already out to that circle on the spark plug side of the chamber. If I still need a couple of more cc's in the chamber, is it acceptable to expand the side opposite the spark plug side? I have seen where pmuller did i...
by F-250 Restorer
Wed Dec 19, 2018 3:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: chrome side lifter cover?
Replies: 6
Views: 607

Re: chrome side lifter cover?

I took my oem lifter cover to the local chrome shop and had them chrome it. I have had it on for more than 10 years, and it still looks good, no rust.

Image
by F-250 Restorer
Wed Dec 19, 2018 1:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: How to remove valve seals
Replies: 1
Views: 315

How to remove valve seals

The seals I have sit down inside the boss. How do I remove them? Head has about 40k miles on it. I thought I'd replace them while in there.

Thanks.
by F-250 Restorer
Sun Dec 09, 2018 11:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Does anyone have any experience with the Clifford 6-8 dual carb setup?
Replies: 10
Views: 932

Re: Does anyone have any experience with the Clifford 6-8 dual carb setup?

I find that very interesting that one of the posters has a set of headers that's been going for 15 years. I have been running my Hedman set for 10+ years. Of course the efi manifolds will last nearly forever, but restrict your flow. One tip I would toss in here is to use grade 8 studs and crimp nuts...
by F-250 Restorer
Fri Dec 07, 2018 1:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

Do I need to remove all those scratches and pits?
by F-250 Restorer
Thu Dec 06, 2018 7:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

Here you go.

Image

Image
by F-250 Restorer
Thu Dec 06, 2018 1:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

pmuller9 wrote:Would you post pictures of the polished piston tops.
Thanks

I will try to get a photo up today.
by F-250 Restorer
Wed Dec 05, 2018 1:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

Are the pistons are hung on rods? The pins need lube and rods will rust quick if left unprotected. I'd wait to clean them until it's time for assy. Then a few drops of oil on the pins on each side. IDK how your shop did it, but I use engine assy lube on the pins. Normally, any piston work is before...
by F-250 Restorer
Wed Dec 05, 2018 1:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

I mean that the ring groove must be deeper than the width of the rings so the rings aren't help out past the piston sides. I had a set of rings where the oil rings were too wide and wouldn't let the piston go into the cylinder even though the ring end gap was good. The metric rings and piston groov...
by F-250 Restorer
Tue Dec 04, 2018 11:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

Sorry, guys. I didn't see the last two replies until now. I'll check end gaps. Good to know. Pmuller, what do you mean the ring depths? Can you please explain. I will do what is needed. Oh, and I know this is a silly question, but today I polished the dish on each piston. Although I blew out each pi...
by F-250 Restorer
Thu Nov 29, 2018 11:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rod Bearing width, etc.
Replies: 24
Views: 1548

Re: Rod Bearing width, etc.

I bought these rings, sealed power e-251k 30, and they are supposed to be non-filing. Does that mean I still have to check each set? Also, there was no bevel or mark on either the compression nor oil ring. Just to double check, does that mean install as you will?

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