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Discussion Starter #1
Ok, here we go.... I have a 67 coupe with a 69 302 engine with an offenhouser 4bbl alluminum intake manifold and a holley 4160 600cfm carb. w/vacuum secondaries. The old point's style distributor has been changed to a magnetic pickup assembly w/vacuum advance. The car was running fine if a bit rich untill recently. My problem is, whenever i stomp the gas (in park or drive) my carb. makes a huge sucking sound then POP! right back up through the manifold. This only happens from a dead stop. When i'm already cruising along and I stomp it, no problem. I thought it might be the power valve, so i changed it along with a new accelerator pump diaphram. Still does the same thing. Also, I've noticed a slight miss at idle. Please help me solve this problem. Any comments are welcome..... thanx!
 
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Discussion Starter #3
Bishir posted about a similar problem just a few days ago. He fattened up his mixture and got rid of most of the symptoms.
I have experienced similar carb backfires when I installed too light advance springs (from the Crane kit) and returning to the stock springs cleared it right up. Given that you have a new distributor you might think about having someone tune the car (ie. chassis dyno or a good old race guy) to get everything sorted out.There's a guy around here that'll keep your car overnight and will shake it out for $50('course I'd hate to see one of his 'torture tests'!).
.......Bill
 

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When mine did this the first time, it scared the poop out of me! (running in the garage w/o the air cleaner box) Big ol' flame jumping out of the carb..."Ho, yeah that's good stuff."

http://my67heven.tripod.com/emsm.gifI was looking for a restoration of fantasy. I do not want my car to be as it was in 1967. I want it to be as I imagined it in 1967. -John Baird
Got Rust? 1967 A-Code Coupe
 

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Your timing is to far retarded. Give it some more timing till it pings
a little, then back it off till it just doesn't ping. Good Luck!

http://home.earthlink.net/~myradpc/_uimages/turn4.JPG
Turn 4 @ Laguna Seca----Turn 2 @ Sears Point
http://home.earthlink.net/~myradpc/_uimages/turn8.JPG
 
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Discussion Starter #6
Why different wheels, different numbers and roll bar variance? Are different numbers assigned at different races? This gotta be two different runs, correct?

Dan
Be a good dad to your kids and phone your mom twice a week...
 

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Believe it or not they are the same wheels, I think the sun had something
to do with the way the photo cam out. I try to get #351 every time but
the person it is reg. to has to pass on that event for me to get the number.
The Sears point photo is a older shot without the rollbar, dumb I know but I
did it. The Laguna Photo is a more recent photo.

http://home.earthlink.net/~myradpc/_uimages/turn3.JPG
Turn 5 @ Laguna Seca----Turn 2 @ Sears Point
http://home.earthlink.net/~myradpc/_uimages/turn8.JPG
 
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Discussion Starter #8
n/m

Dan
Be a good dad to your kids and phone your mom twice a week...
 

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I had a Holley 4 barrel that did that. Along with the pop, I'd get a bunch of soot shooting out of the exhaust! I kept tinkering with it and finally replaced it with an Edelbrock 1405. No more pops :) Plus a carb makes a really cool looking paperweight!

'65 289 4V Edelbrock 1405 600CFM C-4 yada yada yada
 
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