Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power WindowsRain Gear Wiper Systems
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



Username Post: Carb tuning help.        (Topic#352011)
Impala_dave 
Contributor
Posts: 402

Reg: 07-15-14
07-13-18 06:13 PM - Post#2739908    

Hello all so I finally finished building my motor and installing my th350. My motor is stock 4 bolt bottom end with flat top pistons with 4cc valve reliefs 2.02 fuelie heads with manly stainless valves harland sharp roller rockers comp camp spring comp cam xe268h cam edelbrock rm performer intake holley 750 vacuum secondaries. Now my issue is its breaking up at full throttle and plugs look alittle lean. I'll try to post pics of the plugs. My ignition system is a mad street fire with jegs 8mm wires and ngk yr5 plugs gapped to 35. And 12 degrees initial timing. I replace the ignition module with a stock head replacement if that matter. If anyone can help or needs any more info please ask thank you.

[image][/image] left plug is cylinder 4 and right is cylinder 3

[image][/image]

Cylinder 4 far right cylinder 3 far left and cylinder 7 in the center




Edited by Impala_dave on 07-13-18 06:19 PM. Reason for edit: No reason given.

 
This Forum is Sponsored by
1-800-IMPALAS  *  www.impalas.com
Visit Impala Bob's forum on ChevyTalk
427SS65 
"14th Year" Platinum Supporting Member & Moderator
Posts: 14542
427SS65
Age: 72
Loc: St. Louis, MO
Reg: 12-11-03
07-14-18 10:05 PM - Post#2740001    
    In response to Impala_dave

Your problem might be remedied with slightly larger secondary jets. Try a set of AC Delco 44's.

Tom 65-70 Full Size Team Moderator

View My Photos Here

65 Impala SS Tahitian Turquoise


 
Impala_dave 
Contributor
Posts: 402

Reg: 07-15-14
07-15-18 06:03 PM - Post#2740101    
    In response to 427SS65

I did rejet the carb it has 72 mains and 76 secondaries I swapped the 76 into the main and 80s into the secondaries. It got worse. So I swapped my edelbrock that needs a rebuild back on it to se if it runs better. And it does so I'm gonna rebuild the edelbrock and see how she runs and re check the plugs after running it for alittle and see what the plugs have to say



 
This Forum is Sponsored by
1-800-IMPALAS  *  www.impalas.com
Visit Impala Bob's forum on ChevyTalk
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

89 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.334 seconds.   Total Queries: 13   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 06:01 PM
Top