455 olds quadrajet

4speedracer · 02-10-2014, 01:39 AM

Working on car not a race car, with lean idle condition and unable to get low enough idle speed approx. 900rpm .Question i have is did some quadrajets have holes drilled in primary throttle plates from factory ? Have vacuum advance hooked to manifold vacuum, without manifold vac engine labors to much and shows late timing with vac gauge. Base timing at 8 degrees, also has no vacuum leaks found .
Thanks Jamie

02-10-2014, 01:39 AM	#1
4speedracer Junior Member Join Date: Sep 2011 Posts: 51 Likes: 0 Liked 10 Times in 6 Posts	455 olds quadrajet Working on car not a race car, with lean idle condition and unable to get low enough idle speed approx. 900rpm .Question i have is did some quadrajets have holes drilled in primary throttle plates from factory ? Have vacuum advance hooked to manifold vacuum, without manifold vac engine labors to much and shows late timing with vac gauge. Base timing at 8 degrees, also has no vacuum leaks found . Thanks Jamie