[Greg Reid]

You're set up sounds pretty much just like mine. Even the temp concerns. I'm climbing a little past 220 and with no relief in sight it gets me concerned.
While looking at this I was leafing through the Rocky Rotella book and J. Hand books and found my handwritten notes. 14* initial at 750rpm. Mechanical starts at 1300 and adds 7*. Fairly linear increase and all-in at 20* added by 3500 rpm. That's added to 14 initial, totalling 34* by 3500-ish. With full vacuum I just took a reading of 28° BTDC.
I don't think that that's going to be a problem at idle with no load since it's advancing the exact same amount now as soon as l crack the throttle.

[jhein]

OK, so I have 15 deg of vacuum advance at idle connected to manifold vacuum. I have my initial timing set at 10.5 (dead center between 9 and 12). My mechanical advance is coming in at 24 deg, total being 34(.5) all by 3000 rpm. I also did some tuning of the carb, idle mixture and idle. I have 15 in/hg at 750 rpm. Oh, and I do have the newly rebuilt 7040263 carb on it.

I took it out for a little test run. It's running better now than it ever has. Starts right up (new mini-starter too which is amazing, no more hot start problems). Idles well, great throttle response. No knocking. When those secondaries open, it goes. Water temp is at 180 degrees even sitting at idle for quite a while while I was doing all the tuning.

So I'm tempted to just leave it alone at this point.

[Carousel72TRed]

Hi Jhein,
Where did you get your mini starter? Ames sells them and I think Summit does too. Is it heat resistant?
Carousel72TRed

[jhein]

Originally Posted by Carousel72TRed

Hi Jhein,
Where did you get your mini starter? Ames sells them and I think Summit does too. Is it heat resistant?
Carousel72TRed

I don't know for sure where it came from. I initially got a Powermaster 9000-10 from Summit. That was supposed to fit according to the Powermaster website. However, it did not, even with re-clocking it. I believe that starter only has two different clocking positions. My mechanic then got a Powermaster 9510 which has "inficlock" clocking so you have "infinite" 360 deg clocking which did fit. So I don't know where he got it, but Summit does have those in stock according to their website. I don't know what brand Ames sells.

As far as function, that bad boy spins the motor with ease even when hot. I can't tell any difference in cranking at all when hot.

[hiyabradHO]

Originally Posted by Kenth

All 1970-74 Pontiac V8´s, except 1971 455 H.O., uses the Transmission Control Spark system (T.C.S.).

What did the 1971 455 H.O. use?

[74SDformula]

Originally Posted by hiyabradHO

What did the 1971 455 H.O. use?

Looks like they have a ported vacuum source. Sorry the photo is upside down.