So I finally get my stroked SB fired up after several years of building up.
1st of all WOW!
, and a couple of
All my patience seems to have paid off.
It's been about 2 weeks now since I last fired it up. Excessive work (6 days a week), couple of mini vacations, a few birthdays, list of honey do's... and yard work have kept me busy.
This idle issue has been on my mind almost every moment of the day.
I have read many other posts and still have no solution yet. Maybe I missed a post that may have helped. Been writing on this post for the last 3hrs now.
Just found one (https://www.camaros.net/forums/showth...acuum+readings
) BUt I'm too tired to read anymore for now and I'm going to bed.
Mom and the kids are taking me to Monterey tomorrow for my birthday.
Oldest son wants to go on a boat to see the Whales and Dolphins.
Here's the story.
I sent my Rochester Spread Bore 750cfm Vac secondary carb off to Sean Murphy for restoration and calibration for its intended application. (Sure looks good) Throttle response is amazing. Tuning problem I am having is getting a steady idle vacuum reading. Highest vacuum reading I got was 17hg. Smoothest reading was around 15hg but the gauge bounced between (+ - 1 deg) at idle. Engine seems to like the initial timing at around 18deg. I can't get the (no load) idle RPM below 1000/1200RPM before it starts to run so rough like it is going to stall out. I have dabbled with the Air/fuel mix and timing till I had to walk away.
There does not seem to be any vacuum leak any where but I won't rule that out just yet.
What am I missing?
Should I set the carb for the best readings and then re-adjust the rockers to maybe 1/4 lash while she is running at operating temp?
Any help is very much appreciated.
Here is a basic run down of my engine setup.
AFR 195 heads opened up, ported and polished a bit.
Edelbrock RPM intake
Pro Magnum 1.5 roller rockers (lash set at 1/2 turn)
Comp cams hydraulic XE274 Cam
(BTW, Valve train noise is next to non existent using Joe Gibbs BR Performance Break-in Oil)
PerTronix billet flame thrower magnetic Pickup distributor & Coil
PerTronix flame-thrower 8mm spark plug wires. Custom fit.
Bosch 7557 plugs
Holley Mechanical fuel pump 110 GPH 6.5 to 8 psi
Thorley headers ( Currently dumping into a 2" dual exhaust with Flowmaster muffs)
2.5" exhaust and Borla Mufflers on the horizon.
I did a cold compression test and here are the following psi readings.
1- 195 2- 190
3- 200 4- 190
5- 208 6- 200
7- 200 8- 200