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- #61
Finally, locate the source of the oil. This was in a cold engine. I will replace the valve stem seals in this cylinder.
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Never dreamed or Kingsbury grade at those speeds. You are correct at maintaining 65 in freeway driving as a goal.
Not sure what Kingsbury grade is but I regularly take a Freeway with multiple 6% ascents and my F.5 is fine accelerating up to the max speed of 130kph (~80mph) in 4th gear, as long as I am already at a speed that allows to open the secondary body of the carburetor (I think it's around 50mph in 4th).
Done this multiple time, stuck on the right lane behind a truck at ~55mph in an ascent, pressing the gas all the way down, the secondary opens (in one shot on a F carb) and puts a big kick all the way to 80mph, which helps a lot to insert on the passing lane with the flow.
For driving a long time at stabilized speed it's happier at ~70mph.
Done this multiple time, stuck on the right lane behind a truck at ~55mph in an ascent, pressing the gas all the way down, the secondary opens (in one shot on a F carb) and puts a big kick all the way to 80mph, which helps a lot to insert on the passing lane with the flow.
For driving a long time at stabilized speed it's happier at ~70mph.
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Great work isolating and finding your issue.
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- #67
At the beginning, I tried the regular gas one and didn’t feel it was right. After playing with the timing, she is running on 93 gas now, and it feels much more stable. No aftermarket cam.
That is great for power across the rpm range.
I assume the head on the left is the 61040 head? Thank you for the visual .
It means you already have 3.7 ratio diff, with 4.1 diff we are already a touch above 3000rpm at 70mph.
80mph should be ~3500rpm on mine (with 7.50R16 tires) but it's doing fine. Noisy but engine is fine at this speed, it's a L6 it needs to run from time to time.
But anyway, no tachometer + ear plugs = no worries
Obviously if it's your daily and doing a lot of miles every year it may be a different story. Wouldn't say no to a 5-speed if it was an easy swap and keeping the originality of the truck (but it's not on a 1974).
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I just run premium in all my vehicles, (except my wife's Subaru Crosstrek, I dislike that vehicle). Figure it is just easier than worrying about pre ignition.
Not big hills, just maintaining hills and slopes around Reno/Carson city. I can keep it around 70 now with 4spd but I have to run above 3000rpm (my self imposed limit)
Nobody said Kingsbury grade!!! Couldn't maintain 65 in my SL600!!
I'm afraid to check.....
That is great news. Did it actually fix the oil issue, or just reduce it?
Should have said i also have 33 inch tires.It means you already have 3.7 ratio diff, with 4.1 diff we are already a touch above 3000rpm at 70mph.
80mph should be ~3500rpm on mine (with 7.50R16 tires) but it's doing fine. Noisy but engine is fine at this speed, it's a L6 it needs to run from time to time.
But anyway, no tachometer + ear plugs = no worries
Obviously if it's your daily and doing a lot of miles every year it may be a different story. Wouldn't say no to a 5-speed if it was an easy swap and keeping the originality of the truck (but it's not on a 1974).
I have 4.10 gears, but with 33 inch tires.It means you already have 3.7 ratio diff, with 4.1 diff we are already a touch above 3000rpm at 70mph.
80mph should be ~3500rpm on mine (with 7.50R16 tires) but it's doing fine. Noisy but engine is fine at this speed, it's a L6 it needs to run from time to time.
But anyway, no tachometer + ear plugs = no worries
Obviously if it's your daily and doing a lot of miles every year it may be a different story. Wouldn't say no to a 5-speed if it was an easy swap and keeping the originality of the truck (but it's not on a 1974).
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- #79
I checked it twice after fixing it, and it looks good. It is running, and there is no issue. I don't want to look inside anymore
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- #80
Probably. This is not my picture, I found it here.