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Old 01-21-2013, 06:54 AM
BuzzLOL BuzzLOL is offline
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.. Ignore the red hot headers for now, since they're wrapped/insulated, of course they're going to run hotter than bare ones that can loose heat/energy/power...

.. Sounds like you have a severe lean misfire at high RPMs... and plugs verify it... those look like old used plugs that were sooted up a bit, then you put them back in the new engine build and they're burning white/lean/too hot on the ground strap/outer electrode end...

.. As others noted, is the timing advancing as the RPMs go up... are all the EFI sensors good?

.. What did you do to make a 355"? Was it a 350/355 to start with? Was the EFI/TBI for a 350/355 or for a 305?

.. Is this an edelbrock 2-bbl. TBI intake or a 4-bbl. one with a 2bbl. adapter? Are the cylinders sealed/separated 4 and 4 from each other under the TBI, or is there some common plenum opening feeding all 8 cylinders? If there is common plenum for all 8 cylinders, it usually requires a richer TBI or carb. secondaries to avoid going too lean at WOT...
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