Crank no start after rebuild?

Tiny
DALTONTROTTER
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
Recently rebuilt my whole top end in my 5.3 and threw a cam”mad max” in it. I replaced every sensor on the engine with ac delco. I installed an after market intake called aces efi. The truck is getting fuel and it’s getting spark. I don’t have a fuel return line I just plugged it but I don’t think it should affect it that much. When cranking everyone once in a while I’ll get some fire out of the exhaust which is just long tube headers no full exhaust yet. Any ideas on what’s wrong with it?
Saturday, November 29th, 2025 AT 7:02 PM

3 Replies

Tiny
DALTONTROTTER
  • MEMBER
  • 4 POSTS
Truck will shoot some flames when cranking but just won’t start.
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Sunday, November 30th, 2025 AT 6:57 PM
Tiny
DALTONTROTTER
  • MEMBER
  • 4 POSTS
I changed out my crank and camshaft sensor with my old ones which still worked and that didn’t fix the problem all of the grounds are good too
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Sunday, November 30th, 2025 AT 7:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
So with this camshaft it can be holding the valves open, I would remove the spark plugs and do a compression test to make sure this is the problem. Here is a video to help you.

https://www.youtube.com/watch?v=KOxIm1F8AW0

Get back to me with the readings please.
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Monday, December 1st, 2025 AT 10:11 AM

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