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Post#4. You have lost me. The idle jets on the exterior....I presume you mean the idle mixture screws. What do you mean mate to the float?

That is the WORST place to put EDM holes because it is where the max load is. You are taking away surface area where it is most needed. EDM hole should be off centre.

That should have the ball & trunnion U joint up front. They can be clunky when they wear. If it is old, has mileage on it, it should be replaced. With a GV, you might need to hack into the trans tunnel/floor pan.

What heat range are the plugs?

Good post^^^^^. Chrys used low-er taper lifters on the 6 pack & I believe the Hemis. The lifter rotation would have been slower, but more contact area.

Pontiac built an experimental 427 OHC engine in the 60s. One of the Pontiac engineers, 'Mac' Mc Kellar got one & put it in his daily driver.

N/seats could be jamming in the closed position. So no fuel will enter the carb. Remove carb top. Hold up & watch floats drop down. Needles should drop with floats. If not they are binding. Unless the n/seats are severely worn, I do not use them in current o'haul kits. Don't trust them.

Pretty sure EPDM refers to the material that the insulation is made of....not the metal core. Be careful with the 'hype'. MSD plug leads are advertised as 'silicon'. Only the outer red or black jacket is silicon. The white inner material is EPDM.

Looks like a hole in the centre. The finish looks a bit rough to me, but it could be the pic. If you can catch your finger nail on the machining, that is a no-no.

And alum brake drums.

It is BS to say Carters are sensitive tio fuel pressure. I have run 9 psi at the strip as means of enrichening the mixture, no problems at all. Chart below comes from Carter as you can see: 10 psi. As with any carb, the float level should be set according to the fuel pressure. My loooong...

Omit the Edel filters & use an external inline filter. Float level should be 7/16"; make sure floats are not binding...or rubbing on the side of the body. Have you driven it again? If problem still exists, give more info.

You will get LOTS of answers. ALL different. I run break in oil for 2000 miles; it is not just the cam that has to break in. After break in, pick your favourite oil that is designed for FT cams.

Offer to buy her a female ladder.......

I doubt veeeeeeeeeeeey much that a Champion '14' spark plug would be too hot for THIS engine. Dieseling is caused by high idle speed & high engine temps, not spark plugs. Alum heads remove heat faster; so all else being equal, you need a hotter plug to maintain tip temperature. Unless the...

The 850 carb has large[r] throttle blades. That means they let more air into the engine compared to a smaller carb. If the engine load/gearing is 'right', I could see that this engine could cruise at 60 mph on the transition cct.

As others have mentioned, cams for low compression engines require careful thought. They are already HP compromised due to the low CR. The 280 cam that PR mentioned would be as big as I would go.

He says his transition is lean. Transition fuel is supplied by the idle jet. Increase the idle jet in 0.002" increments & retest. Idle mixture gets RE-adjusted via the mixture screws. You could also try raising the fuel level slightly about 0.100" before drilling any holes.

Need more info: - rough idle acceptable? How rough? - max rpm? - what intake, carb?

I see no harm in idling. It [ wear of lobe & lifter surface ] is about the amount of time that the two parts are in contact. Taxis can spend a lot of time idling at the taxi rank, yet the engines are known for long life.