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Username Post: new headers        (Topic#357703)
stoveboltshane 
Poster
Posts: 12

Reg: 09-07-17
08-17-19 11:47 PM - Post#2773440    

hi guys recently put my 59 chevy belair 235 away to fit new split stainless steel headers have run them dual headers into single pipe into a 18 inch glasspack exiting at the rear , she fires up fine and revs no problem but when i put her in gear and try to pull away she stutters and stumbles then dies , tm not running any heat to the intake manifold yet , and did notice my plugs are pretty black do you think the lack of heat could be the problem ? or is it possible the new headers or intake manifold havnt sealed propperly against the block ? cheers .



Edited by stoveboltshane on 08-24-19 11:04 AM. Reason for edit: No reason given.

 
Ecklers AutoMotive
JayChicago 
"9th Year" Silver Supporting Member
Posts: 357
JayChicago
Loc: Chicago
Reg: 01-03-13
08-18-19 12:13 PM - Post#2773490    
    In response to stoveboltshane

Black plugs and unable to run under load made me think of choke not opening. I’m not familiar with how the automatic choke senses engine heat on the 235 engine. Did that function get defeated with the new headers?



 
stoveboltshane 
Poster
Posts: 12

Reg: 09-07-17
08-21-19 09:33 AM - Post#2773760    
    In response to JayChicago

i run the 235 with a webber 38/38 now and manual choke which im pretty sure is working ok



 
stoveboltshane 
Poster
Posts: 12

Reg: 09-07-17
09-15-19 09:21 AM - Post#2775564    
    In response to stoveboltshane

have now fitted heat to intake manifold from new headers via copper tubing and exhaust gasses, also put timing light on motor only to find timing was way retarded now timing reset she pulls ok in gear , took out on open road with the new dual headers fitted and the 18 inch glass pack silencer she has less power than with my original cast iron header set up not what i was expecting .



 
Mel Foye 
*VIP* Founding Member
Posts: 4877
Mel Foye
Reg: 09-29-00
09-15-19 11:20 AM - Post#2775570    
    In response to stoveboltshane

B4 the headers were added did the Webber run ok? How did the timing get retarded?
I am a believer in heat but I am not leaning toward it is your problem.
Manual or PG? Idle rpm?



 
stoveboltshane 
Poster
Posts: 12

Reg: 09-07-17
09-15-19 11:41 AM - Post#2775575    
    In response to Mel Foye

yeah before the split headers the webber was great, the car was pretty reactive on the throttle even on hills , as well as fitting the headers i also fitted a pcv valve? , and she seemed to run a bit lumpy after that at tick over so i just loosened the distributor and turned it till engine smoothed out , but ive never put a timing light on her before always timed it by ear never been a problem, shes a 2 speed auto , engine runs lovely now but just lacks the oommphh it had before fitting the so called performance improving headers.



 
Mel Foye 
*VIP* Founding Member
Posts: 4877
Mel Foye
Reg: 09-29-00
09-15-19 03:13 PM - Post#2775592    
    In response to stoveboltshane

Timing by ear or vacuum is right up there with building a house without a measure to me. They have followers but it just doesn't fly to me.

Now on to fixing your problem. Vacuum line not leaking and vacuum advance working? Is the centrifugal working?
After checking those out how about taking out the PCV and plugging both ends. I am 100% for a PCV set up but need to backtrack here. Does a Webber say how to hook PCV up? Is the valve for a cubic inch size engine like yours? Mel



 
stoveboltshane 
Poster
Posts: 12

Reg: 09-07-17
09-15-19 03:49 PM - Post#2775597    
    In response to Mel Foye

i didnt hook the pcv to the webber , i hooked it to the vacuum point on the inlet manifold , the advance and retard working ok, the plugs used to burn a good colour before i put the headers on with no heat , with no heat they were pitch black but that was only firing it up in a garage and not using on open road , then i found the timing was out, and i added heat now the plugs centre core are quite white with black soot on the rim of the plug ,when i drive her she hesitates under throttle specially up hill more you depress the throttle , more she struggles , ease off the throttle she picks up a bit and wants to go ? with the 18 inch glasspack its becomes all noise and no go under load




 
Mel Foye 
*VIP* Founding Member
Posts: 4877
Mel Foye
Reg: 09-29-00
09-15-19 10:11 PM - Post#2775619    
    In response to stoveboltshane

The stumble with trying to increase speed and when backing off the gas and it runs better reminds me of working on a friends Corvette. It had a Q-Jet and the cam like part that raises the metering rods up was rounded off. So the back barrels would open and dump in more air but the rods did not let in more fuel.
What is your Webbers way of letting in more fuel when needed?
Was the PCV valve matched to your size engine?



 
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