Baffled

[Ron in SoCal]

Gae when you say hesitating under load, is it a stumble/miss and then builds rpms?

[Track Junky]

Originally Posted by Ron in SoCal

Gae when you say hesitating under load, is it a stumble/miss and then builds rpms?

Its an intermittent hesitation that doesn't stop until I let off.

Stand by for some pics.

[Track Junky]

OK, so here is a pic of the cracked cap that I replaced that I thought would fix the issue.



Hers a pic of the rotor I just pulled off. Notice the broken portion to the upper left of the screw. That's a weird deal there

[Vegas69]

So it misses from the time you matt it until you hit redline? Or is it only initially and cleans up?

Where is the timing?
Have you checked the fuel pressure at WOT?

The gear change may require you to install a slightly bigger accel pump cam on the secondary side. Meaning, more volume initially. I say this because you should be accelerating a bit quicker which means you are gaining rpm faster.

That cap looks short, are you sure it's the right one?

[Ron in SoCal]

This is a guessing game without more info, but presume fuel is getting to the carb, your wires/spark is good and timing events from the distributor are as they should be. Do you have PTFE fuel hose forward of the pump? Slight cracks (even on the return side) will do that. Also pull the valve covers and inspect just in case.

I've also seen internal detonation cause this issue (hope not!), but if you don't find the issue do a quick compression check. Fingers crossed it's something simple Bro

[Track Junky]

Originally Posted by Vegas69

So it misses from the time you matt it until you hit redline? Or is it only initially and cleans up?

Where is the timing?
Have you checked the fuel pressure at WOT?

The gear change may require you to install a slightly bigger accel pump cam on the secondary side. Meaning, more volume initially. I say this because you should be accelerating a bit quicker which means you are gaining rpm faster.

That cap looks short, are you sure it's the right one?

Yes...as soon as I hit the secondary's until I let off.....and that is exactly what I was thinking Todd......more fuel may be needed.

Havent checked fuel pressure or timing yet.

Stand by....more pics

[Track Junky]

Pic of rusty reluctor

[Vegas69]

Plugs all being consistent rules out compression and likely any other mechanical cylinder issue. The valve springs probably need checked but I doubt it's the problem here as it would likely be a high rpm misfire.

A worn distributor gear will retard the timing and cause a pope and misfire. Ask me how I know...

Check the fuel pressure and timing before you waste more time.

[Track Junky]

And now the million dollar question. Above is a spare MSD distributor. Below it is the one I pulled out of the car with the bronze gear (which is still in good shape.)
Can you guys tell me why one gear is higher than the other because I don't have a clue.

[Vegas69]

Different application or the gear is on upside down.