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Joined: Apr 2008
Posts: 131
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2008
Posts: 131 |
My 1968 Camaro has a 327/275 and having major problems with idle and low end speeds
Adance id ar 15 degrees,dwell at 28 new 45S AC Plugs, new Delco Wires,New Point Dist. and Advance, Compression at 160 to 170 vacuum at idle 19 inches.
The engine runs super rich and plugs are blackened with soot and the exhaust is to strong it will run you out of the garage
My Quadrajet builder said it is not the Carb.?
Would appreciate any suggestions as I have been working on small blocks for years and I'm stump, engine has about 10k on a complete rebuild with a mild cam, Thanks Denny
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Get another Quadrajet builder. Change out the carb to check it out.
How Sweet the roar of a Chevy four!
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Joined: Apr 2008
Posts: 131
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2008
Posts: 131 |
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Check the rocker arm travel. Some of the new cams are not properly hardened and will loose lobes.
Gene Schneider
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Joined: Apr 2008
Posts: 131
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2008
Posts: 131 |
Thanks, checked the tolerance at static vavles that were closed had the right travel and non engaged rockers allowed the push rod rotated with just a slight drag
Not very good at setting valves but there was no clatter and the engine was built with a Melling camshaft but a grind just over stock or RV
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Joined: Aug 2011
Posts: 214
Backyard Mechanic
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Backyard Mechanic
Joined: Aug 2011
Posts: 214 |
When I was working as an auto mechanic in the 70's, I remember some Q-jets having problems with the floats absorbing fuel and becoming to heavy. Alot of carb rebuilders overlooked this.
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Joined: Apr 2008
Posts: 1,194
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Apr 2008
Posts: 1,194 |
The well plugs are known to leak in a Quadrajet.
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
Joined: Dec 2001
Posts: 11,162 |
Yes I have a Q-jet body (original for our 68 327 275HP) that had been repaired with JB Weld and finally gave up the Ghost when the threads for the needle and seat corroded and wouldn't hold threads. I bought an exact replacement Holly rebuild through my local Mom & Pop auto parts, farm equipment store. for $125 5 years ago. They were only going to allow me $21 for my old core so I kept it for internals. The bottom of the float bowl was paper thin.
Life's a long winding trail, love Jesus and ride a good horse!
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