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Discussion Starter · #1 · (Edited)
I have a 355 SBC with a cam duration 228 degrees at 050" .511" lift inlet and exhaust. the engine is not recenty rebuilt but has stood a while, I have had a few problems getting this engine going and gradually it has started backfiring through the carb, this backfire is in sync with the engine, not random. I have had a look around and found a large clearance on no 4 exhaust rocker and noticed that the lifter does not travel the same distance as others. My theory is that because no 4 is not exhausting the cylinder is still under slight compression when the inlet opens, causing the popping and banging back up the carb.

what are your thoughts ?
 

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You have whipped out that lobe.
Cam is now bad! :( Sorry!

it's trash.

Some questions?

How old is cam been in the engine?
What oil?

Flat tappet cams need ZDDP for a period to live!

Al
 
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