|
|
Another carb size question!
#59848
05/19/08 07:31 PM
05/19/08 07:31 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
Looking for a new carb for my 70 GTX. I'm currently using a Holley Street Avenger 770cfm and the car seems to bog or just has no bottom end torque. It's a street only car with a mostly stock 440, iron heads, MSD Ign. compcams 231dur 525lift and factory iron intake, 727 TF and 3.55 gears. Was thinking 650cfm Thunder Series carburetor. All thoughts welcome. gary 
|
|
|
Re: Another carb size question!
#59850
05/19/08 07:33 PM
05/19/08 07:33 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
IF your stuck on a holley.. go HOLLEY 850 VS, otherwise get a DEMONSIZZLER 850 ThermoQuad.
|
|
|
Re: Another carb size question!
#59851
05/19/08 07:40 PM
05/19/08 07:40 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
I have not made any adjustments to the carb. haven't touched it.
Last edited by wilk308; 05/19/08 07:46 PM.
|
|
|
Re: Another carb size question!
#59852
05/19/08 07:52 PM
05/19/08 07:52 PM
|
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
|
Quote:
I have not made any adjustments to the carb. haven't touched it.
I think those are jetted with 72's from the factory. A set of 76's might cure the bog (might not too). Are you running 36-38 degrees total mechanical advance? What about Vacuum advance (many 440's like a total (combined) of about 54) That can greaty improve throttle response.
|
|
|
Re: Another carb size question!
#59853
05/19/08 08:05 PM
05/19/08 08:05 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
I've got the initial timing 15deg. tot mech 36 and 52 w/vac hooked up. I get ping anything beyond that. I have O experience tunning carbs but it seems to be way rich. Plugs are almost black. Got this carb second hand so I have no idea who's been in it. 
Last edited by wilk308; 05/19/08 08:19 PM.
|
|
|
Re: Another carb size question!
#59854
05/19/08 08:17 PM
05/19/08 08:17 PM
|
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
|
Quote:
I've got the initial timing @15deg. tot [Email]mech@36[/Email] and 52 w/vac hooked up. I get ping anything beyond that. I have O experience tunning carbs but it seems to be way rich. Plugs are almost black. Got this carb second hand so I have no idea who's been in it.
Since its a second hand carb, before I did anything else, I would tank off the primary bowl. Maybe the previous owner put 80 + jets in there!!! MAybe it has a blown power valve? Check those two things next and then re-think a strategy before ditching the carb...
|
|
|
|
|
|
|
