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Author Topic:   Popping and Rough Running Small Block Chevy
NJantz
Member
posted April 20, 2004 05:50 AM
You didn't mention if you checked the timing. I've had problems where I didn't tighten the distributor enough and it's worked itself out of time during a race. Just a thought...


avila
Member
posted April 20, 2004 11:32 AM
sounds iginition system related.
check grounds, battery charge, wires ...
the sparks may have been unburned fuel in
hot headers, could have been flames.


R26MOD
Member
posted April 20, 2004 06:30 PM
Check to see if flywheel is hitting the starter drive.


NJantz
Member
posted April 21, 2004 05:21 AM
you run a 377 don't you ours did the same thing this year machine shop said that for one the 400 blocks are bad about blowing head gaskets but in 3 years we have never had this problem. Make sure you check block surface for flatness. Two you are running to lean or three head gasket failure. We used a different head gasket this year when it happen to ours went back to the expensive fel-pro and did't have a problem. How big a groove did it leave in your block and heads.


NJantz
Member
posted April 21, 2004 07:46 PM
we use the 1034 on ours what plugs were you running we use the autolite 134. We never had a problem till we use the rebuildt kit from speedway all the gaskets were good except the head gaskets they didn't look right when we put them on but we called and they said nobody was having troubles with them. The cooling lines in the heads redistribute the water for better cooling but we have never done it.


chomme
Member
posted April 21, 2004 09:46 PM
Another cooling trick (especially on 400 blocks) is to run external lines from the block drain plugs up to the heads between the 2 middle cylinders. Just drill and tap a hole for a 1/4" NPT fitting and run it straight up from the bottom of the block to the heads.


chomme
Member
posted April 22, 2004 10:25 AM
Mine was about the same and the machine shop welded both up and resurfaced everything ready to go back together for $200 well worth it considering they were my dart 215 cc heads and I only have 2 400 blocks both 377.


NJantz
Member
posted May 13, 2004 01:31 PM
I was told it takes alot on alchol to lean it out and burn the headgasket out the problem we found was the head gasket we used this year. Put 1034 felpro in and no troubles. How far down the threads of your plugs were you showing alchol. We lean down till we get color into the first thread of the plug.


NJantz
Member
posted May 14, 2004 07:21 AM
YES!!!


02racing
Member
posted May 14, 2004 11:53 AM
yes go to the 1034 the steam holes shouldn't hurt we block ours off. From the sounds of your plugs the color change could off come from once the block and head were fire slotted. We thought we ours was lean but like I said it ended up being faulty headgasket were leaner now than we were then. Have been for six weekends and no troubles and the color goes down to first thread off the plugs on 3 and 5.


NJantz
Member
posted May 19, 2004 12:46 PM
YES!! To keep the ring out of the chamber. I'd use deck reinforcement plugs as was mentioned earlier. I'd say your cam timing was off a smidgen and exhaust valve was opening prematurely. That was the start of the problem. Then when the torching progressed it created a lean condition and when the cylinder lean popped a couple times on the alky and blew the head gasket wide open. *Lean on alky is gonna create a pop at the end of the straightaway. ONE or two of these and you're done.


NJantz
Member
posted May 20, 2004 05:47 AM
Thanks a ton for your guys' help.


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