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Comment by Jack Wasmuth on May 3, 2018 at 11:08pm

David check the cylinder walls for scoring. Also check the piston closely. The heat in that cylinder will affect other parts. Sometimes the top compression ring gets damaged as well. After you reinstall the heads, do a compression test.

Place a couple of rare earth magnets on your new oil filter. This will trap any metal that may be floating around in your oil.

The straighter the intake runners are you will get more fuel to the cylinders. Air goes around corners but the fuel puddles at the turning point. A stock dual plane intake manifold is basically for mom and pops going to the store. Your torker is made for mid range power.

Using a higher grade fuel (octane) slows the burn and produces more power. I only use 90-92 octane. It also burns cooler with respect to the richness. The ECM tries to maintain 14.7 to 1 air fuel ratio throughout the power curve. 

The O2 sensor would pick up the lean condition and increase fuel to all cylinders. Even with port fuel injection the ECM can not richen up one cylinder. With two O2 sensors (one for each bank) the ECM richens up one bank and not the other. The TBI unit works well.

Comment by David W. Davis on May 3, 2018 at 10:53pm

Chris,

Yes, 441 is 4 lanes most of the way, no traffic. Some small towns, takes a while, but few semis, very relaxing. Many campgrounds are close to 441. Picking it up in Athens, GA, going directly to Gainesville, FL, then down to Ocala, over to 95, then US1 on down.

Dave

Comment by David W. Davis on May 3, 2018 at 10:21pm

Jack,

Of course, you're correct, exhaust valve. Seat is recessed. Going to have the head rebuilt with hardened seats.

Has an Endlebrock Torker manifold and Holley 4150 that I inherited from the previous owner. Torker is a really simple large plenum manifold. Maybe I should find another manifold or a factory 4 bbl manifold. Cast iron is ok. It is an RV, reliability is important. With TBI the lean condition would still exist at the 1,2,5,8 cylinders.as the manifold would be the same. Port injection would be better. Not sure this is all worth the expense for an RV. I could just be sure the end cylinders are rich enough. EGT would work, used on  aircraft, or I could fit a wideband O2 sensor near the #8 cylinder.

Comment by postman on May 3, 2018 at 8:00pm

Jack Wasmuth, my bad. I didnt mean a test gauge I meant a dash mounted. I was factory trained on Sun Engine Analyzer and Dynanometer.

The true sweet spot 22 psi (secondaries open). The vacuum decreases from 27 psi on acceleration, causing the timing advance to actuate at approximately 65% of torque output and the carb accelerator pump squirts . Yes atmospheric pressure does impact performance. So what happened with the burnt valve, I agree burned to lean. LOL I was typing when your reply came in.

All the tricks and tips we did, are now done on chips.

Comment by Jack Wasmuth on May 3, 2018 at 7:06pm

A vacuum gauge is a good tool for finding the sweet spot for timing if you do not have a timing light and also for adjusting the idle circuit on a carb. However a vehicle does not travel down the road at idle. Fuel mixture and timing change with rpm and load. 

I had a chassis dyno in my repair shop and it is a valuable tool to properly tune any vehicle as I could see what was happening while pulling a hill with a load. A adjustable timing light and the ability to read a spark plug is crucial. A carb will go rich while climbing in altitude. It is necessary to jet the carb leaner by 0.002 for every 4,000 ft rise in elevation. Hope this helps.

Comment by Chris Ramey on May 3, 2018 at 6:48pm

I second that, Postman! A GOOD vacuum gauge and a REALLY GOOD Timing Gun!

Comment by postman on May 3, 2018 at 6:45pm

Jack Wasmuth  I have a 440-3, carter on an edelbrock performer (sealed the deal), because wont run worth a darn without the right cam.  Somewhere i read a conversation about vacumn and rich and lean. I reply, "A vacumn gauge is your best friend on a dodge big block." 

Comment by Chris Ramey on May 3, 2018 at 6:25pm

Hmmm. Must have gone on the wrong thread... Also, the celeryfone is actin' up.

Comment by Chris Ramey on May 3, 2018 at 6:20pm

441 is a back road heading North South

Comment by Jack Wasmuth on May 3, 2018 at 6:18pm

Dave your problem was more likely caused by a lean condition. The four corners cylinders of a v-8 tend to run lean and the #8 cylinder is the most common. Unleaded fuel played hell with the valve seats. Is your seat recessed? I can't tell buy the picture but that is a exhaust valve, larger is intake. 

I installed a TBI unit from Affordable Fuel Injection. It is a complete early 1990's Chevy 350 from a pickup. The reason I installed this unit is ease of install and the availability of replacement parts and coast. Just less that $1,000.00 (I did not use their Dist.)

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