Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 05-23-2021, 05:43 PM
dmarr35 dmarr35 is offline
Member
 
Join Date: Dec 2018
Posts: 62
Thanks: 14
Thanked 32 Times in 10 Posts
Default Carb replacement Suggestion

I am having trouble with the Holley 4150 on the 1969 Copo 427 idling I had it restored but the consensus is it has a problem does anyone have a suggestion on a Holley replacement the engine is as stock I installed a Factory Muscle 242/242 Solid Flat Cam runs fine just idle when hot in gear
Reply With Quote
Click here to view all the pictures posted in this thread...
  #2  
Old 05-23-2021, 11:26 PM
RPOLS3's Avatar
RPOLS3 RPOLS3 is offline
Yenko Contributing Member
 
Join Date: May 2009
Location: Rockford, IL area
Posts: 3,109
Thanks: 4,230
Thanked 1,713 Times in 733 Posts
Default

Send it to Eric Jackson
__________________
Jake Dykstra

Dykstra Motorsports
Reply With Quote
  #3  
Old 05-24-2021, 12:39 AM
1971ls6's Avatar
1971ls6 1971ls6 is offline
Senior Member
 
Join Date: Mar 2011
Location: Michigan
Posts: 190
Thanks: 15
Thanked 75 Times in 51 Posts
Default

I have the carb for you. I built this Holley HP 950 for my Copo, it is tuned and fresh. During Covid, I was bored and built both a down leg and an Annular booster 950’s.

This carb is very responsive on the street over a 850
__________________
1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
Reply With Quote
  #4  
Old 05-24-2021, 02:37 AM
67since67's Avatar
67since67 67since67 is offline
Yenko Contributing Member
 
Join Date: Mar 2016
Location: Waterloo Iowa
Posts: 1,740
Thanks: 2,700
Thanked 3,934 Times in 949 Posts
Default

I agree with Jake, Eric can fix that.
Reply With Quote
The Following User Says Thank You to 67since67 For This Useful Post:
dmarr35 (06-04-2021)
  #5  
Old 05-24-2021, 10:24 PM
JRSully JRSully is offline
Yenko Contributing Member
 
Join Date: Dec 2002
Location: Long Island
Posts: 2,330
Thanks: 0
Thanked 318 Times in 155 Posts
Default

Eric will dyno test your carb before it goes back to you, then you can get him on the phone while its running to finish off the tuning. You may need to rebush throttle plate tubes, which some rebuilders don't like to, but its a constant vacuum leak if you don't
__________________
70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55
71 Porsche 911 Targa
Reply With Quote
The Following User Says Thank You to JRSully For This Useful Post:
dmarr35 (06-04-2021)
  #6  
Old 05-25-2021, 12:22 PM
WILMASBOYL78's Avatar
WILMASBOYL78 WILMASBOYL78 is offline
Yenko Contributing Member
 
Join Date: Jul 2003
Location: new york
Posts: 8,171
Thanks: 1
Thanked 1,597 Times in 491 Posts
Post Carb issues...

Many car issues are difficult...this one is easy. SEND IT TO ERIC.

-wilma
__________________
02 Berger 380hp #95
Lots of L78 Novas
Join National Nostalgic Nova!
70 Orange Cooler
69 Camaro
Reply With Quote
The Following User Says Thank You to WILMASBOYL78 For This Useful Post:
dmarr35 (06-04-2021)
  #7  
Old 05-26-2021, 12:45 AM
firstgenaddict's Avatar
firstgenaddict firstgenaddict is offline
Yenko Contributing Member
 
Join Date: Jul 2001
Location: Greenville, South Carolina
Posts: 5,596
Thanks: 161
Thanked 942 Times in 457 Posts
Default

Before sending the carb off...
With the auto and big cam the rpm's will drop when in gear and the advance can will drop out and the idle suffers greatly.
Check your distributor vacuum advance.
When the car is in gear what is the vacuum reading?
Which advance can do you have in the distributor?

IF you run a B28/VC177 advance can (all in at 8" of vacuum) it should stay deployed when in drive and allow the car to idle.
__________________
~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
#21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built.
71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
NUMEROUS Lemans blue Camaros,
Monza Red and Daytona Yellow Corvettes
& a Chevelle or two...
Survivors, restored cars, & other photos
https://picasaweb.google.com/lh/myphotos
Reply With Quote
  #8  
Old 05-26-2021, 12:58 AM
1971ls6's Avatar
1971ls6 1971ls6 is offline
Senior Member
 
Join Date: Mar 2011
Location: Michigan
Posts: 190
Thanks: 15
Thanked 75 Times in 51 Posts
Default

While Eric does awesome work, you may not want to foot the bill that comes with his masterpieces.

I have the same car and have a good idea what will work. I am not looking to sell one of the carbs I have built, just help out a hobbyist like myself.

Feel free to pm me if you need help
__________________
1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
Reply With Quote
The Following User Says Thank You to 1971ls6 For This Useful Post:
dmarr35 (06-04-2021)
  #9  
Old 05-27-2021, 09:57 PM
napa68's Avatar
napa68 napa68 is offline
SCR Sponsor
 
Join Date: Oct 2008
Location: Presque Isle, WI
Posts: 3,232
Thanks: 4,356
Thanked 3,069 Times in 903 Posts
Default

I remember a saying........

"90% of carb problems are ignition related"

Otherwise.......I'm an Eric guy too!

Tim
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:33 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.