Carb. Rebuild

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Aug 10, 2018 | 06:27 AM

69vette427/435

Thread Starter

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Joined: Oct 2014

Posts: 64

Likes: 2

From: Toms River NJ

Carb. Rebuild

I looking to send out Rochester to get rebuilt. Any suggestions on where to send it? Want to make sure it's done the correct way

Aug 10, 2018 | 06:53 AM

kansas123

Melting Slicks

Joined: Sep 2006

Posts: 2,815

Likes: 470

From: Wichita Kansas

Quote:

Originally Posted by 69vette427/435

I looking to send out Rochester to get rebuilt. Any suggestions on where to send it? Want to make sure it's done the correct way

https://www.corvetteforum.com/forums...and-after.html

Last edited by kansas123; Aug 10, 2018 at 06:58 AM.

Aug 10, 2018 | 09:26 AM

Street Rat

Le Mans Master

Joined: Aug 2010

Posts: 5,339

Likes: 546

From: Central Texas

Get a hold of lars here on the C3 forum. He is a resident Quadrajet guru.

Aug 10, 2018 | 02:00 PM

sambrand

Racer

Joined: May 2018

Posts: 297

Likes: 43

Quote:

Originally Posted by Street Rat

Get a hold of lars here on the C3 forum. He is a resident Quadrajet guru.

he is well known throughout all the forumns I have subscribed to, never heard a single bad word about his work, only praise. send it to lars.

Aug 10, 2018 | 06:50 PM

gguillot

Racer

Joined: Mar 2011

Posts: 490

Likes: 99

From: The South

Quote:

Originally Posted by Street Rat

Get a hold of lars here on the C3 forum. He is a resident Quadrajet guru.

++1 on Lars. He's rebuilt one Quadrajet, two Holleys and two Delco distributors for me. Top quality work.

Aug 10, 2018 | 10:27 PM

Calo69

Drifting

Joined: Sep 2014

Posts: 1,430

Likes: 59

From: Long beach NY

St. Jude Donor '15-'16, '18

Probably the easiest answer to any question i've seen asked. Gave me great advice.

Last edited by Calo69; Aug 11, 2018 at 12:01 PM. Reason: spelling

Aug 11, 2018 | 08:13 AM

TedH

Le Mans Master

Joined: Feb 1999

Posts: 8,351

Likes: 75

From: Tampa Bay FL

Quote:

Originally Posted by 69vette427/435

I looking to send out Rochester to get rebuilt. Any suggestions on where to send it? Want to make sure it's done the correct way

After 15 years on ethanol, I sent my q-jet to Lars for its second rebuild (he rebuilt it in 2003).

He got it in ship shape for less than half the going rate for a rebuild and that included all shipping and repairs. Can't beat that price especially with tune and set-up on his test engine included.

Be sure to include specs on your engine config for baseline considerations.

If you send to Lars, be sure to use the #7 USPS Priority Mail box (or equivalent). I think it measures 12x12x8" (8" tall) and you will need to drain and wrap the carb with copious amounts of bubble wrap with box stuffing to keep it snug.

Aug 11, 2018 | 08:18 AM

tyrant

Pro

Joined: Sep 2002

Posts: 747

Likes: 54

From: Dunmore PA

Another happy customer of Lars here. There is no one else I would consider.

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Aug 11, 2018 | 11:14 AM

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,380

Likes: 6,390

From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by TedH

After 15 years on ethanol, I sent my q-jet to Lars for its second rebuild (he rebuilt it in 2003)..

Ted - Have you run the carb again yet? Hope we got it all straightened out for you!

Quote:

Originally Posted by TedH

If you send to Lars, be sure to use the #7 USPS Priority Mail box (or equivalent). I think it measures 12x12x8" (8" tall) and you will need to drain and wrap the carb with copious amounts of bubble wrap with box stuffing to keep it snug.

Yeah, as Ted had the unfortunate experience of finding out, if you don't follow the shipping instructions that I provide to you, and your failure to follow instructions results in damage to your carb, I will chew your butt and ridicule you mercilessly...

Thanks for everyone's kind comments - it's fun to build nice products for people who appreciate and enjoy the results!

Lars

Last edited by lars; Aug 11, 2018 at 11:20 AM.

Aug 11, 2018 | 01:32 PM

#10

Jebbysan

Dr. Detroit

Joined: Mar 2012

Posts: 10,097

Likes: 4,027

From: New Braunfels Texas

Quote:

Originally Posted by lars

Ted - Have you run the carb again yet? Hope we got it all straightened out for you!

Lars

This guy has no idea what he is doing.................................sp ending all day on Corvette Forum

To the OP..........E-mail Lars and ask for his timing and carb papers.......great reads. Even if you send out your carb to him.....still read the literature.....it is priceless.

Jebby

Aug 11, 2018 | 07:16 PM

#11

twinpack

Drifting

Joined: Mar 2009

Posts: 1,461

Likes: 361

From: Monson MA

Lars rebuilt mine and when I dyno'd my L79, the machine shop was very surprised how well it performed. No adjustment was need and It produced 383 HP/428 FT.TQ. Lars was very informative, performed excellent work and turn around was unexpected. Thank you Lars.

Aug 11, 2018 | 08:46 PM

#12

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,380

Likes: 6,390

From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by twinpack

Lars rebuilt mine and when I dyno'd my L79, the machine shop was very surprised how well it performed. No adjustment was need and It produced 383 HP/428 FT.TQ.

Peter's carb was actually a good example of the "normal" condition that these carbs are in when I receive them. Here is the "short list" on the problems that his carb had when I received it from him:

Fuel leak at inlet fitting - faulty inlet fitting gasket
Lean primary jets
Lean secondary rods
Incorrect primary rods installed - rich at cruise
Low APT (power piston height) - set very lean
APT adjustment tang machined off flat with throttle plate by previous rebuilder
Cold fast idle screw fully backed out - no fast idle - 560 rpm
Hot idle set very low
Cold fast idle mixture set at 20:1
Hot idle mixture set at 12.5:1
Throttle plates not aligned in throttle bores, jamming the throttle
Secondary linkage adjusted to prevent secondaries from opening more than 50%
Power piston rod hanger arms bent

With a few replacement parts and a good setup, it sounds like the carb turned out pretty good - good to hear that I got lucky again...! I hate it when you guys check my work on the dyno....

Quote:

Originally Posted by Jebbysan

This guy has no idea what he is doing.................................

Jebby - you promised me you wouldn't tell anyone that I just copy/paste stuff I find on the Internet to make it sound like I know what I'm doing... Yeah, so I have to spend all my time on the 'net to find plausible quotes to re-post... Thanks for really blowing my cover, man...