Interesting pop coming from HEI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jimbotronics · 11-19-2004, 02:50 PM

87 350 w/hei and holley 600cfm

When i rev my engine and then let it back off I hear a solid 'pop' coming from the hei distributor. Truck is running great (other than flooding on me every now and then).

Also a quick question about timing, if I'm standing on the driver side of the truck pointing the timing light down at the harmonic balancer, where should the lines be.... marking on balancer should be before, even, or after pointer marking...?

Super Duck · 11-19-2004, 02:55 PM

I have no idea about the pop but with the mark bafore would be btdc and after would be atdc on the mark would be a big 0

Jimbotronics · 11-19-2004, 03:30 PM

well now - there's one more terminology i can add to the list... thnks

btw: bad a$$ truck super duck! I had a 69 swb step in high school just about that color. Just added yours to the list of colors to decide from on repainting this one.

Super Duck · 11-19-2004, 03:34 PM

the collor is bahama blue

Longhorn Man · 11-19-2004, 03:46 PM

The noise sounds to me like worn bushings on the shaft of the HEI. When you let off the throttle, the dist wants to climb the gear, and it is letting it do so. Then ot hits the seal and stops it, causinf a popping noise.

This is speculation, I have never had one do this, nor have I had one with worn bushings. Just seems to make sence to me.

Jimbotronics · 11-19-2004, 04:28 PM

hmmm, never tore into one - are they rebuildable or does it mean buying new? If in that's what it happens to be.

JimKshortstep4x4 · 11-19-2004, 08:11 PM

Check that the cap is seated and latched down. It is possible that the rotor is hitting the cap.

Jim

11-19-2004, 02:50 PM	#1
Jimbotronics YA YA Join Date: Aug 2004 Location: Rockledge, Fl Posts: 1,273	Interesting pop coming from HEI 87 350 w/hei and holley 600cfm When i rev my engine and then let it back off I hear a solid 'pop' coming from the hei distributor. Truck is running great (other than flooding on me every now and then). Also a quick question about timing, if I'm standing on the driver side of the truck pointing the timing light down at the harmonic balancer, where should the lines be.... marking on balancer should be before, even, or after pointer marking...? __________________ Jimbo '72 SWB - 350 (frame-off resto in progress - donations accepted) '04 Chevy Avalanche '03 Cadillac CTS (wife's ride) Restoration progress - http://67-72chevytrucks.com/vboard/s...d.php?t=335707

11-19-2004, 02:55 PM	#2
Super Duck Chevy Nuttttt Join Date: Sep 2004 Location: Santa Maria Ca. Posts: 568	I have no idea about the pop but with the mark bafore would be btdc and after would be atdc on the mark would be a big 0 __________________ 67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell is there anything else?

11-19-2004, 03:30 PM	#3
Jimbotronics YA YA Join Date: Aug 2004 Location: Rockledge, Fl Posts: 1,273	well now - there's one more terminology i can add to the list... thnks btw: bad a$$ truck super duck! I had a 69 swb step in high school just about that color. Just added yours to the list of colors to decide from on repainting this one. __________________ Jimbo '72 SWB - 350 (frame-off resto in progress - donations accepted) '04 Chevy Avalanche '03 Cadillac CTS (wife's ride) Restoration progress - http://67-72chevytrucks.com/vboard/s...d.php?t=335707

11-19-2004, 03:34 PM	#4
Super Duck Chevy Nuttttt Join Date: Sep 2004 Location: Santa Maria Ca. Posts: 568	the collor is bahama blue __________________ 67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell is there anything else?

11-19-2004, 04:28 PM	#6
Jimbotronics YA YA Join Date: Aug 2004 Location: Rockledge, Fl Posts: 1,273	hmmm, never tore into one - are they rebuildable or does it mean buying new? If in that's what it happens to be. __________________ Jimbo '72 SWB - 350 (frame-off resto in progress - donations accepted) '04 Chevy Avalanche '03 Cadillac CTS (wife's ride) Restoration progress - http://67-72chevytrucks.com/vboard/s...d.php?t=335707

11-19-2004, 03:46 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	The noise sounds to me like worn bushings on the shaft of the HEI. When you let off the throttle, the dist wants to climb the gear, and it is letting it do so. Then ot hits the seal and stops it, causinf a popping noise. This is speculation, I have never had one do this, nor have I had one with worn bushings. Just seems to make sence to me.

11-19-2004, 08:11 PM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Check that the cap is seated and latched down. It is possible that the rotor is hitting the cap. Jim



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