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78,
Sorry for any confusion, but I think you are confusing 'total' timing with idle timing.

Total is what the engine wants under load at high rpm, though it may come in at lower rpms. There is...

LX,

I have the Chinese HEI in my GTO, been in a few years, driven weekly. They even come with a steel dist gear, & I am using mine with an 8620 roller cam. No problem. I have lost count of how...

LX,
Why don't you get a GM HEI for it? Put your own curve in it so you can run MVA. $80 brand new from Road Star in Sydney. I would be happy to set up the dist for no charge. I provided the...

I do not think Summit is the problem as far as shipping goes. There is a HUGE amount of product on b/order in the US. Some of it could be due to the China/US trade war.

I have a contact at Comp...

What he is saying is he is blipping the secondary shaft.

In that case, I suspect fuel flow from the sec T slots would be correct because that is the only airflow into the engine & is at high...

Basic,

Were you using the Crane VA unit? Those & many others like Accel & Mr. Gasket have a sleeve inside the spring & when adjusting rate AND travel, the thing can lock solid & you get NO vac...

Basic,
No argument from me that modern digital ign systems can duplicate the timing features provided by MVA. Some like me like the simplicity & reliability of MVA to get the job done, not to...

Not a silly question. VA, whether ported or manifold sourced, is a load sensitive device, based on engine load & vacuum. That is the beauty of it. When you go to full throttle, vac drops to zero or...

Basic.
Yes". many engines run 'perfectly fine without 35-40*', on, say, 15* init timing . The point is that many of them would run better with 35-40* of idle timing...or substantially more timing...

Basic,
Couple of comments about your comments. My reference to needing 40* at idle was specific to this engine, which has low vacuum [ & also a big cam, & specifically the overlap ] & low CR;...

LX,
'Runs heaps better with more timing at idle'. Believe me, you are NOT the exception to the rule. I 'preached' on here when I first joined about the benefits of manifold connected vac adv [...

Agree with EH about more timing.

If I am reading the numbers correctly, you have a total of 40* at cruise. That is really low for 9.0:1 CR. I would add at least another 5 -10* of vac adv. That in...

Excellent set up!

I think most likely cause is a vacuum leak or valve adjustment [ valves not fully closing because of wrong lifter pre-load adjustment ]. Also check the PCV. Block the PCV. If vac is then steady, PCV...

The idea is to try 'balance' the force or load on the t/shaft to minimise wear. So there would be some adverse affect if there is a spring pulling in the same direction as the linkage/cable. It might...

Smitty,

I looked at the pic of your cable. Same problem. Cable & spring pull in same direction putting extra force on the t/shaft. You could create a balanced force by hooking the spring on the...

Smitty,

It is a problem whether a cable or rod linkage is used. It as all about the force pulling or pushing on the shaft, whether it is cable or rod linkage. The only difference might be between...

Two points.

Don't use RTV where petrol or fumes come in contact with it. It softens up. If you are sealing a threaded hole in the induction system, use Loctite 567 Pipe Sealant.

Many GM cars...

Symptoms do point to excessive fuel pressure as a possible cause. No need or reason to reduce plug gap with HEI. I have run over 3mm plug gaps...just for the heck of it....

Ran & started just the...

Hq308,
You are correct, no relay. I saw that he 'rewired' for 12v & assumed a relay was used.

Kavesh.

Water is heavier than fuel & sinks to the bottom of the tank. So it gets sucked up...