The N6E1 seems to be later than what I have been able to pick up. I have
only run into the N6D and N6D1 units. Both are the large bore and use the
piston diaphragm. But when I ran a drill bit through the secondary (next
size up on the drill bit) on one of the later carbs, it seemed to get better
top end, and it didn't screw up the idle circuit, but I had to use a thicker
gasket on the end of the needle so it would seat.
I was using the Tach on my Coupe to note when the points let go, so your 8K
RPM may be closer to the correct point. Although it might have been my
points too. Since the engine valves can impact the piston when out of time
I try only to smooth the surface on the heads although I retorque the head
after running it for an hour or so.
I found that using an oil cooler with a thermostat for the oil kept the
engine running at optimum temperature, caused less varnishing on the cases,
although it didn't keep the cam chain from stretching. I tore one engine
down every 10 K miles and measured several items but watched the cam chain
and drive chains the most. I found that 40K to 45K miles was about average
on a cam chain with a driver who takes the engine to its red line during
most shift ranges. And I have seen a cam chain on another vehicle whose
driver never drove above 5K RPM that achieved 60K on a cam chain and when I
measured the chain it still had not stretched enough to warrant changing it.
Then I had another friend who allowed his teenaged daughter drive his sedan
and she popped the sprocket dampers and broke the drive chains. People who
worked at the Burger shop she worked at said she drove the car like it was a
race every day.
But take a look at the
group page in the parts photo album. I put a picture of the oil cooler set
up there. The only modification to the engine is the oil filter cap and
center bolt. But it really keeps the oil clean
and cool. I have had three engines come back to me after more than 10
years in operation with a oil cooler on them. Talk to Harry Lineback, he
has had one on his Sedan since 1990. Another guy is Henry Tate in Oklahoma,
who used to drive his Coupe between Bartlesville and San Diego every six
months or so, rebuilding his engine when he got home each time until he
installed a oil cooler. That was in 1989, he has not rebuilt his engine
since. Excessive Heat causes wear, take away excessive heat and the wear
is less. I say this because it seems your intent on making your engine HOT.
Bill