New engine in Formula, more problems then a math book!
#21
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Join Date: Oct 2000
Location: Spicewood, Texas USA
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One quick observation. You are using Vortec heads. Since they are a fast burn chamber design you cannot run a lot of timing like you normally would on a BBC. 28 degrees total advance is about the maximum you can run. It's possible you detonated it right off the bat if you had a lot more timing initially. Maybe broke a ring land, torched a piston or tuliped some valves.
Bob Lloyd
Bob Lloyd
#27
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The 8.1 was referred to as a "vortec" also. I don't even think a 8.1 head would bolt on a 454 block. I assume he has gen 6 vortec heads. They do NOT like a lot of timing. I'm also pretty sure if you bolt those heads on a older block you must use the right head gasket. If the wrong gasket was used, water flow would be all jacked up. Prob overheating the block/heads from a water flow issue. I'm not certain on what mods are required to make that work ? That might explain why after 7 minutes it all went to $hit.
#28
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What was the piston to wall clearance ? I think the reason it starts running worse after it runs for a while is because your vent tubes from the valve covers are putting oil in your carb. Also that is very low compression.
#29
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If for some reason the head gasket didnt block the front water hole in the block, the water will bypass right thru there, coming out the thermostat housing. The rest of the heads and block will not cool, and overheat, but the temp gauge sender will still see water flow, and think all is well since its located at the Tstat housing area.
#30
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newer rings these days are looking for a very specific cylinder wall finish, no longer can you just scuff and install most of the rings now, you have a issue(no ****) in the pistons/rings, could be the hone job, the wrong ring(size/type) were they file fit rings ? or just plan screwed up on the install...