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Old 08-07-2005, 01:46 PM
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Edelbrock 1405 no top end

I just bought a 1984 GMC half ton short bed truck. It has a 1405 edelbrock 4-barrel with a 350/350. The low end is good but it seems like the engine doesnt want to rev up. Is there a way to tune it so it has more top end? Or maybe Im just used to the JET Q-jet in my blazer which has alot of top end. Would it just be better to put a Q-jet on there?

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Old 08-07-2005, 01:58 PM
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While I always recommend a Q-jet, in this case it`s not that simple, there`s too many things that can cause lack of top end. Lack of fuel from float level too low, fuel pressure too low, secondary`s set too lean, lack of ignition, valve train worn, cam worn, exhaust corked up, air cleaner corked, fuel filter corked, slackish timing chain, spark timing too low, lack of spark advance, tune up in bad shape, etc. What distributor are you using? is the computer still in use? Need more info on the overall.
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Old 08-07-2005, 02:52 PM
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The distributor is the AC delco HEI, and appears to be new, as well as the wires and plugs. I have a feeling it is the exhuast manifolds. The computer is no longer a factor becuase all the emissions stuff has been removed. It has a 2 inch dual exhuast with glass packs. When I keep it in 1st gear it revs up, just takes a while to get there. The rear gear is 3.08 which might also be the problem. Maybe a performer intake and some 1.5in headers would help out some?
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Old 08-07-2005, 05:30 PM
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At this point, you, and everyone else can only assume that its a stock engine. If it revs to 4500 its doing good. 5000 may be wishful thinking. Like previously posted, there are too many other things to consider before condemming the carb. Valve float is a big one, so are crappy flowing heads and restrictive exhaust.
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Old 08-07-2005, 05:54 PM
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i seriously doubt that the 3.08 gear is the problem.

dual 2" shouldnt keep the engine from getting to 5500. unless theyre packed with bannanas

i stock 350 will rev to 5000 just fine. even 5500. if something has failed then you will have problems.

can you verify your timming setting for me?

is it starting off in 1st?

do the plugs look lean?


i have found that 5500 is easy to attain. you just need to be able to control/tun your fuel and timming curve. going past 6000 is the challenge. speaking hydraulic domestic v8s of coarse.

Last edited by Drugs; 08-07-2005 at 06:07 PM.
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