Engine help - Team Camaro Tech
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post #1 of 4 (permalink) Old Nov 4th, 05, 11:17 AM Thread Starter
Join Date: Sep 2005
Posts: 4
Engine help

This in kind of hard to explain, but I`ll try. I have a 406 in my 74 Z28, with th350 and 4.10 gears. This car is very very very slow. My 1/4 mile time is 15.01 at around 82 mph. I would have to think that I have major firing problems, possibly busted rings. I changed the plugs and wires, didn`t help any. Also, if you hold the pedal to the floor, the car sounds like its running out of gas for about 4 seconds, then runs for about 2, then starts running out of gas again. What do you guys think.
schevy is offline  
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post #2 of 4 (permalink) Old Nov 4th, 05, 01:21 PM
Join Date: Oct 2005
Posts: 477
Re: Engine help

Could be anything Carb problems, fuel pump, ignition, timing, or others. Give us some information on what you have and what you have checked etc.
TexasPerfProd is offline  
post #3 of 4 (permalink) Old Nov 4th, 05, 02:19 PM
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Join Date: Dec 2003
Location: Leander, TX
Posts: 2,762
Re: Engine help

A compression test would be your first step before you spend any more time and money. The test could reveal that the engine is in need of a rebuild.

Don't mean to add to your disappointment, but a 406 can't be bored to .060 so, if you need a rebuild, starting looking for a std bore 400 block.

But, I hope your comp test reveals that the rings and valves seals are good. Then you can begin diagnosing ignition and fuel metering.

Are you using any oil?
Straight-line-69 is offline  
post #4 of 4 (permalink) Old Nov 4th, 05, 05:30 PM Thread Starter
Join Date: Sep 2005
Posts: 4
Re: Engine help

I got the car with bought this 400 and was told it was bored .30, so I figured that was a 406. Carb is brand new Edelbrock 600. I was thinking it could be the fuel pump, because it is the small kind (stock I believe) with a oversized cam. Not sure of the exact size of the cam. One thing I do know, it is impossible to get a smooth idle. As far as oil, 4 quarts last me about a month and a half, with fresh oil change every 3 months. Im pretty sure it isn`t the vacuum advance, and I know I don`t have any vacuum leaks.
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