Timing

Barry Jackson · 12-17-2002, 08:10 AM

Ok, I read the great disertations as of 12/8 on timing. Really it was very helpful to me. Now, should I run my vacuum line from the distributor above the plates on into the base on my holley? It appears I should run it above to bring in the vac on a timed basis. Is there a situation where I would want to run it in the base?
Thanks,

WADS56 · 12-17-2002, 10:06 AM

If you run it below there will be allot of vacuum at idle keeping your timing advanced at idle, and when you are at WOT there is less vacuum and it may even pull timing. So yes run it above.

PKRWUD · 12-17-2002, 12:45 PM

Run the vacuum line from the distributor to the vacuum port on the passenger side of the primary metering block (just behind the site plug in the primary bowl). There is never a time when you will want the vacuum advance connected to manifold vacuum (vacuum ports on the intake manifold and the carburetor throttle plate are manifold vacuum).

Take care,
~Chris

12-17-2002, 08:10 AM	#1
Barry Jackson Registered Member Join Date: Oct 1998 Location: Pitts. Pa. USA Posts: 61	Timing Ok, I read the great disertations as of 12/8 on timing. Really it was very helpful to me. Now, should I run my vacuum line from the distributor above the plates on into the base on my holley? It appears I should run it above to bring in the vac on a timed basis. Is there a situation where I would want to run it in the base? Thanks, __________________ 87 LX, 74 351W, performer plus intake, holley 750, vac sec., 78 prim. 80 sec., 50 pump: Wolverine cam 292-512, windsor heads, ported 3 angle valve, 4:10 rear, AOD, Lentech valve body w/ 10'' converter. No time slips yet!

12-17-2002, 10:06 AM	#2
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	If you run it below there will be allot of vacuum at idle keeping your timing advanced at idle, and when you are at WOT there is less vacuum and it may even pull timing. So yes run it above. __________________ 79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor 93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe Ricer hater's club member #49

12-17-2002, 12:45 PM	#3
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Run the vacuum line from the distributor to the vacuum port on the passenger side of the primary metering block (just behind the site plug in the primary bowl). There is never a time when you will want the vacuum advance connected to manifold vacuum (vacuum ports on the intake manifold and the carburetor throttle plate are manifold vacuum). Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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