17059284

[passthebuck]

Hi all. I have a 327 bored 60 over with Trickflow 1st gen heads, performer intake & @.050 in. 194/204, Lift .398/.420 cam backed by a 700r4 and 3.08 rear gears with a 29" tall tire in a 4000lb truck. It has a quadrajet carb with number 17059284 & 0749 CBY under that. I just installed 1 5/8 headers and a true dual exhaust & now it surges/stumbles at about 1/2 throttle to full throttle. It had manifolds and a more restrictive exhaust. It was rebuilt years ago with shaft bushings. It ran great and pulled hard with the manifolds but it's not happy with the headers. The rods are stock but I don't know what they are. I suspect that either the primary rods/jets and/or piston spring are too lean & I have your book on order Cliff. I want to get a good baseline (not falling over itself) so I can start to tune for power.

My questions are:

What is my stock jet and rod (primary and secondary) set up?

Where do I start & where do I go from here?

Is this a good carb for performance?

Do I want to install the APT screw?

I just discovered this forum & I'm already impressed. I look forward learning a ton from all the quadrajet gurus here. Thanks in advance for your knowledge!

Greg

[billy 2]

Welcome to the Forum, The 17059284 carb was used on the cars sold in Canada. The primary rods
were 51 and the jets 77, secondary rods are CH. And I would install an ajustable apt screw. It helpswith the last bit of fine tuning. It sounds like you're runnig out of fuel under a load. Cliff will help you with set-up of the carb.
billy 2

[Ethan1]

Welcome to the Forum, The 17059284 carb was used on the cars sold in Canada. The primary rods
were 51 and the jets 77, secondary rods are CH. And I would install an ajustable apt screw. It helpswith the last bit of fine tuning. It sounds like you're runnig out of fuel under a load. Cliff will help you with set-up of the carb.
billy 2

 Yep. What I found as well. As noted, an adjustable APT screw would be great to have. Cliff will help with the other questions.

[Cliff Ruggles]

I'm not familiar with that carburetor number, but it's most likely a large main airbleed model.  It may help to install smaller full tapered primary metering rods to get more control with the APT system.   Probably going to like some smaller tipped secondary metering rods as well.....Cliff

[passthebuck]

Cliff,

Do you have any recommendations as to what rods to start with, or should I repost in the tuning section of the forum?

Greg

[Cliff Ruggles]

Is it the large main airbleed model, with the APT system in front of the power piston?......Cliff

[passthebuck]

I don't think I have the adjustable APT on there & I have yet to receive your book (Canadian mail is slooow) so I'm still not sure what I'm looking for but I took some photos to see if you can see. Ignore that spacer for my air cleaner nut I have resting on the stud so I don't loose it... Thank you again for your help. I have more photos - just ask!

[Cliff Ruggles]

That carb will have an APT system.  Remove the air filter gasket, and look for an aluminum plug directly in front of the choke housing, under the gasket......Cilff

[passthebuck]

Cliff,

There is the alum plug.  Insert embarrassed face here...

[Cliff Ruggles]

Good news.  I would replace it with a 3/8" set screw so you can remove the plug and make adjustments without taking the airhorn off the carburetor or leaving the plug out.

You may not have enough control with the current jet/rod set-up.  The carb is a large main airbleed model.  We typically install smaller MAB's in them, and recalibrate with a better jet/rod set-up.....Cliff

[passthebuck]

Cliff,

Kit received & installed. Is running much better! Thank you! Tuned it with a vacuum gauge & verified it with my Autometer a/f gauge. Still in the tuning stages but at WOT the engine is stumbling, coughing & the af gauge swings to 18+. I THINK it's a stock fuel pump problem (generic no-name factory replacement...).

Do you agree?

If so, can you recommend a pump that kicks out more fuel but that I wont need a regulator for? Carter? Holley Etc?

Greg

[Cliff Ruggles]

Most high performance mechanical pumps do not require a regulator. 

Also keep in mind that they are only as good as the supply to them.  To see maximum output from the pump, it must have large feed lines and no restrictions anyplace.

I've never had much luck with mechanical pumps, even high performance ones on really fast cars, but I wouldn't think the little small block 327 with the small cam would have problems with fuel delivery for what you are doing, even with a stock mechanical pump......Cliff