Pontiac - Street No question too basic here!

          
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #11  
Old 05-13-2025, 07:26 PM
Schurkey Schurkey is offline
Ultimate Warrior
 
Join Date: Aug 2002
Location: The Seasonally Frozen Wastelands
Posts: 6,346
Default

Quote:
Originally Posted by ericwoo View Post
my car is still kind of sluggish IMO.

I have a hard time seeing my 350 producing much more than 300 horsepower.
[*]600 cfm double barrel Holley carb (I tried putting a 750 double pumper and it was bogging down the engine)[/list]
Any idea of what I can look at that may be wrong with this set up? Or what upgrade I should do to get this thing to over 350 horsepower?

I was expecting some decent power but boy this thing is kind of a dog.
PRIMARY problem is that you started with a 350 when there's no penalty for going 400+ cubes. On a mild engine, every cubic inch is one horsepower and 1 1/4 ft/lbs of torque. ~50 cubes = more better. 100+ cubes = happiness.

Secondary problems:
600 cfm DOUBLE BARREL Holley carb??? Apparently with no tuning

Cam installed "dot-to-dot" when there's a half-dozen things that all are needed to be precisely machined for that to be accurate--and "accurate" may still not be "optimum".

No mention of timing advance tuning

No mention of piston design/quench distance/ring package/block honing


As said--compression test needed. Fuel pressure test needed, with engine at WFO and max RPM. Verify throttle plates open fully, and the trans TV cable and shift-points match the torque curve.


Last edited by Schurkey; 05-13-2025 at 07:32 PM.
The Following User Says Thank You to Schurkey For This Useful Post:
 


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 -4. The time now is 09:44 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017