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09-30-2011, 10:20 PM
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#1 |
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Registered User
Join Date: Sep 2011
Location: Eau Claire, Wisconsin
Posts: 415
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engine dead spot
Hi guys, ive been messing with my 327 lately and it has a dead spot as soon as you hit the throttle.It runs great at higher rpm when you hit the gas but the throttle response is terrible and it hesitates and spits and sputters when you hit the gas hard at a dead stop. If i drive it normal it runs fine but as soon as you hammer on it it hesitates and runs bad. The motor is a 327 thats bored .30, has a .464/.480 crane cam, 202 camel hump heads 487 casting, hydraulic lifters harland sharp roller rockers, victor jr. edelbrock intake, and holley 650 double pumper carb. I dont know if its the mix of parts thats wrong, ive messed with the timing and made it better but i cant get it right. Any advice is greatly appreciated. Thanks.
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1969 shortbed c/10 1998 GMC sierra |
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09-30-2011, 10:45 PM
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#2 |
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Registered User
Join Date: Jan 2010
Location: Liberty In
Posts: 46
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Re: engine dead spot
the victor jr is made for best preformance in the upper rpm range but it should Not be totally flat. Does it rev up nice from a idle with no load (in park) or stumble till it builds rpms?
What kind of ignition are you running? and are you running a good premuim octane gas ? Last edited by 68streetrod; 09-30-2011 at 10:46 PM. Reason: left word out |
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10-01-2011, 01:43 AM
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#3 | |
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Registered User
Join Date: Jul 2010
Location: reidsville north carolina
Posts: 64
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Re: engine dead spot
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09-30-2011, 11:04 PM
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#4 |
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Registered User
Join Date: Sep 2011
Location: Eau Claire, Wisconsin
Posts: 415
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Re: engine dead spot
When its in park it has a small dead spot right away and the rest of the rpm range is awesome. I run premium gas with a mix of turbo blue 110 octane every once in a while. It has an hei distributer too.
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1969 shortbed c/10 1998 GMC sierra |
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09-30-2011, 11:26 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: Arizona
Posts: 404
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Re: engine dead spot
I had a similar problem and it turned out to be a bad carburetor gasket.
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10-01-2011, 05:27 PM
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#6 | |
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Registered User
  
Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,214
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Re: engine dead spot
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When I got the new crate engine, I just moved the intake and carb, new dist, etc. from the 307 over to the new 350. Guess what !! The stumble is still there.  All that trouble, $1800 engine and the time it took to swap it for a bad carb gasket. As soon as we replaced it, the stumble was gone. Hope you get it figured out 
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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10-01-2011, 12:02 AM
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#7 |
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Registered User
Join Date: Jan 2011
Location: Edinburg, Texas.
Posts: 194
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Re: engine dead spot
make sure the accelerator pump is squirting as soon as the linkage moves
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10-01-2011, 12:55 AM
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#8 | |
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"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: engine dead spot
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Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69: |
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10-01-2011, 09:04 AM
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#9 |
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Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: engine dead spot
Dual plane would be a better choice, but IMO it is not what is causing his problem. Its the carb, and maybe even a little bit of a timing issue. Do you have vacume advance?
It needs 'dialed in'
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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10-01-2011, 01:37 PM
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#10 |
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Registered User
Join Date: Oct 2006
Location: lost angeles
Posts: 159
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Re: engine dead spot
fairly sure it needs some carb adjustments. changing the cam thing on mine made a big difference. mine had a nice stumble off the line. now i can go as slow as i want to, and i dont have to power thru the flat spot.
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10-01-2011, 03:31 PM
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#11 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
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Re: engine dead spot
That thing needs MORE PUMP SHOT!
Step up about 3 or 4 sizes in the primary squirter. Even though the Victor Jr. manifolds look sick on a street rig... they suck as far as driveability goes. RPM range is somewhere around 3,500 to 8,000. So unless you're seein' above 6 grand on a consistent basis... you're losing a lot of low end torque. Which could also help increase the big stumble you have now. Change over to an Edelbrock Performer RPM Air-gap intake. You'll be glad you did. Gary Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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