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Old 06-22-2013, 07:56 AM
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307 chevy engine problems

Hi

i did buy a chevy 1957 with a 307 and a 3 speed manual instaled by a preavious owner

this car has been nothing but trouble so far
it idels great but if you rev it up to 1500/2000 rpm it dies unless you let up on the gaspedal.

i have done a lot of work on it but it still doing the same thing it did have a fuel delivery problem so i did change out the fuel pump, fuel line and the pick up line in the tank.
did clean the tank.replaced the carb with a rebuildt holley

after that i did replace all the ignition parts except the distributor and coil,
i did veryfi tdc with a special tool. it checked out fine did a compressor test 150 high 130 low not great but still it should run.

the only way to make it run somewhat good is too turn the dist so far that i can not see the timming mark anymore
it dose not seam to like crusing speed/low load condition when driving
it run to a surten point then starts to sputter and die unless you accelareate

this is the first time i have worked on a chevy enginge
what degre im i suposed to sett the timming at ?
i did take the distributor out and looked at it, seams ok the counter weights are moving freely did sett it up looking at the vales on cylinder one i do now that the vacum advance is working maby not right but it is changing the timming when i hook it up
i plan to keep turning the distriputor more to see if that helps
i did do that the ather day and it did inprove things but after a couble of adjustments it wouldent start att all so i need to look in to why

i did read some ather post about setting up the timming on chevy enginges seams like it could be a bit complicated some times

im running out of things to do so any help is apresiated

i did buy a new distributor , hei with a coil in it but havent recived it at this time

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Old 06-22-2013, 08:57 AM
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check the engine vacuum at idle,check voltages.(does it use points)check float level of carb,air filter,exhaust system,total timing at 3,000 RPM,

please post more information or we just guess all day
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Old 06-22-2013, 01:03 PM
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i have checked the float level on the carb several times and its where it supposed to be(gas triceling out of the inspection hole at idle)

i have used a vacum gauge on it and its on green and steady (witch is good as far as i know)

i do not have a air filter on ,and the exausts is ending under the driver seat, it has one muffler on easth side, the previous owner hade it that way and im planing to finich it at somme point

it is using points witch are new i have sett the dwell angle i did find that info somewher online but if somebody knows what it should be let me know maybe i got it wrong

i will check voltages and total timing when i can might be a couble of days
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Old 06-22-2013, 04:12 PM
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30 degrees dwell. Do your self a favor and invest $60.00 in that car and buy HEI
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Old 06-22-2013, 04:46 PM
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thats what i did (HEI )a couple of days a go , just waiting for it to show up in the mail.
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Old 06-22-2013, 05:20 PM
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Rip it out and install a Big Block! a 307 you will not like it. Heavy car needs some Horsepower. This will look cool going but you will think its a Yugo ! You go slow!
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Old 06-22-2013, 06:45 PM
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Def sounds like points or distibutor related.Your new HEI may solve it all.I'd ck all the wiring also.Be sure your plugs & plug wires are good. I have seen vacum leaks & bad valves give similar problems tho.I'd put the new HEI in along with a good COMPLETE tune up.
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Old 06-22-2013, 06:51 PM
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307's can be good lil reliable motors.They can make good reliable power for a daily driver or cruiser.Besides wearing out camshafts,they can be good motors.
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Old 06-22-2013, 07:07 PM
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When you install the HEI, run a brand new wire from the starter switch lug to the coil on the HEI. The original factory wire was a resistor wire or was a wire that ran through a resistor between the switch and the coil. That arrangement will offer your new distributor 12 volts on startup, but then after warm-up, the voltage to the HEI coil will drop to 6 volts. The factory did that to prevent burning up the points with 12 volts all the time. Run a brand new minimum 12 gauge wire. I prefer 10 gauge, but then I always over-engineer stuff that I build.
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Old 06-22-2013, 11:07 PM
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what tech just posted is where I was headed with the voltage questions and if it had points.
also the vacuum guage can also tell you if your exhaust is plugged,saying its in the green does not help me,,,
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Old 06-22-2013, 11:23 PM
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Hans

I'm not certain, but I think if you have the stock wiper motor, you'll have a figment issue on any tri-five (55,56,57) with a coil in cap HEI. Hopefully someone will comment, and hopefully I'm wrong. But, for a tri-five, I think to use HEI, you need the HEI with an external coil. Comments?

PatM
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Old 06-22-2013, 11:39 PM
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the HEI with external coil is better than the GM HEI with coil in cap(for high performance)
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Old 06-23-2013, 08:31 PM
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I do not thinks it's the ignition. If the ignition was giving you problem it would break up or misfire and sometime a back fire. The problem is in the carburetor where the booster jets are not coming into play and causing to die. You could have the main jets plugged.
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Old 06-23-2013, 08:44 PM
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Quote:
Originally Posted by PatM View Post
Hans

I'm not certain, but I think if you have the stock wiper motor, you'll have a figment issue on any tri-five (55,56,57) with a coil in cap HEI. Hopefully someone will comment, and hopefully I'm wrong. But, for a tri-five, I think to use HEI, you need the HEI with an external coil. Comments?

PatM
I certainly don't disagree with Vinnie. But I am concerned you may encounter a fitment issue (iPad "helped me" with figment) with the coil in cap HEI not clearing your wiper motor.

PatM
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Old 06-27-2013, 03:36 AM
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should have looked in to the HEI dist before i bought it i guess as i got it today

i have tryed 2 difrent carbs on this car and it still dose the same if it comes done to it i will check the carb again

i do have 12 volts at the coil wired it strait from the bat via a toggle switch to the coil

checked fuel presuare fluktuats rapidly from 6 to 9 psi but it stay that way up till it dies

i did but a vacum guage on it reads 18 on idle and steady

goes up to 20 and steady when i rev up stayes there till i hit the spot where it starts to die then it starts to drop of to zero when it dies

choked mufflers??? thats what the vacum guage manual says
i m going to remove the exsaust pipes and see what happends
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