Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Choke Pulloff - Marine Carb just rebuilt

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5stareventsdj:

--- Quote from: 429bbf on October 08, 2012, 07:15:31 PM ---greg i hate to ask dumb questions but sometimes you get to the bottom of the problem .did you check the cam timing?maybe the cam is timed wrong.1or 2 degrees .how about comp.?did you get a slug low comp. engine.dean

--- End quote ---
Not dumb questions at all. Thank you for asking them. I've never checked cam timing. Not quite sure how to do it. I did check compression 150psi on all 8 cylinders.  I will look into checking cam timing. I also haven't used a stop to verify tdc. I will put that on my list of things to learn/do.

I bought the engine remanufactured from a reputable engine builder. I didn't expect I would have to check these things... :-(

Greg

429bbf:
greg i built a 1970  429 about 11.5 comp ratio.when i did the comp test it tested about 250 .i could burn diesel.to make a long story short i had a (reputable) shop do the the heads .and guess what? 10,000 miles later i had it back apart because he never put hardened seats in like he said he did. and the valves where half way sucked up in the head.just a suggestion go the the shop and find out what heads, pistons ,and cam are in it and the chevy guys on this site will tell you if it 150 hp or 300. with 150 hp it may only rev up to 3800.jmtc. dean

89SS196:
Did the boat run 4600 rpm before the motor broke?  Maybe your boat has too tall a prop for the motor to turn at the correct rpm.
What is your boat's weight, length and hull deadrise?  These factors all affect the amount of power it takes to propel it.  What is your drive ratio and what is your prop pitch?  If the prop is too tall the motor won't be able to reach correct wide open throttle RPM.
I guess what I am saying is, are you sure the motor is the problem?

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