Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

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1mainiac:
I guess my original post of this did not get worded or understood correctly. My question is what parts should I order to get my carb jetted for this engine setup?, I have the idle mixture screws backed out around 6 turns to get it to idle and it is way lean thru the entire throttle range I can't find any numbers on the jets or rods on the original carb which I would prefer to rebuild and as such would like a idea of which parts to get so I can rebuild it one time and use the boat.

Cliff Ruggles:
We can supply tuning parts wit the rebuild kit.  It will need a slight modification to the idle system as well, since it appears a larger than stock cam is being used.  Marine carburetors are not emission calibrated, and actually pretty generous for fuel delivery everyplace. 

If the engine vacuum is lower at idle and low rpm's than the original engine, it will still need a little help, but it will work fine for the larger engine once you get it tuned correctly......Cliff

1mainiac:
Can you put a kit together and price it for me or secondly what would you charge if I sent you the original carb for a rebuild and rejet.  Here are the basic specs for the engine
Block GM 4-bolt 1 PC rear main seal
Crankshaft Scat steel 383 crankshaft
Connecting rods GM 3.750 w/ARP 150,000 bolts
Pistons Speed Pro Hypereutectic flat top 9:1 comp ratio
Piston rings Mahle plasma moly piston rings
Camshaft Comp marine .462/.477 - 218/224 - 112 specs
Lifters Speed Pro hydraulic
Oil pump Melling high volume oil pump
Timing set Cloyes HD double roller timing set
Bearings Clevite/Mahle HP "tri-metal" rod & main bearings
Flex-plate Pioneer 14" 168 tooth
Harmonic balancer GM externally balanced
Freeze plugs Brass deep dish
Heads GM 76CC 1.60/2.02 cylinder heads
w/hardened valve guides, seats, guide plates & screw-in studs
Valves Stainless steel swirl polished 1.60 / 2.02
Springs Comp series valve springs .530 max lift
Push rods Elgin hardened push rods
Rockers GM 1.5 ratio rockers arms, balls & nuts

The boat ran 4200 rpm at 40mph with the original engine which had 2 dead cyl before it dropped the 2 cyl it would run around 43 at 4800rpm that was a stock 230hp OMC. This motor should make between 350 and 400hp It was listed as 390hp at 5200rpm I am rev limiting it at around 5500 which is plenty fast for a fishing boat.

Cliff Ruggles:
Best to call the shop to order parts.  We can discuss rebuild options if you want to send the carb here and have us do the work.....Cliff

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