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Old 09-08-2003, 09:35 AM
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Mild 350 pops

I have a 350 that I built for low RPM power for my truck. It's got a 650 Edelbrock, a Performer intake, a matched (mild) Edelbrock RV cam, and the stock HEI. It has 2.5" headers that exit with dual glass packs.
I've got stock 882 heads on it.
The timing is set at 11* and runs great.

My question is- when I'm at speed with the motor at about 3000 rpm and I let off the gas a sound comes out of the exhaust like a bunch of softballs being rolled down a wooden staircase (it took me a while to think up that description). Any ideas what that is? My header is tight with a new gasket. It doesn't ping or backfire at any other point, just that weird rumble.

Thanks for any and all help,
-B.

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Old 09-08-2003, 10:49 AM
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Could be normal,depending on the exhaust sytem you have . I had a set of glass packs on mine ,and it would do a rumbling noise letting off of the gas.
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Old 09-08-2003, 11:03 AM
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If you have checked the exhaust system over good and found no leaks, you can have your muffler shop install a crossover pipe inbetween the pipes just past the tranny. They will cut a hole in each pipe, then weld a piece of matching exhaust pipe inbetween the 2 pipes. This is very common and will usually quite down any rumbling in the exhaust system on deceleration. Usually smooths out the sound on accel. too.

Mark
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Old 09-08-2003, 02:24 PM
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I think you are just hearing backpressure when you let off.
I also suggest getting a H pipe.
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Old 09-08-2003, 02:57 PM
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The noise really doesn't bother me, you see I don't so much fit on this board. The truck is a '67 Kaiser-Jeep M-715. It's a Vietnam-era pickup. It came with a 230 in-line 6, but I swapped it out with the 350 for better towing and as such had to make my own exhaust. I'm probably the only member of this board who's hotrod sits on 40" mud tires.
Everything about the truck is simple and cheap. I was just worried that I had trouble with the new motor seeing as how it was my first attempt.

I appreciate all the help, you guys came through where my 4x4 page couldn't.
-B.
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