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Re: How much are my small headers killing my performance [Re: Plymouth340] #2543019
08/29/18 01:59 PM
08/29/18 01:59 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,116
PA.
Originally Posted By Plymouth340
Originally Posted By pittsburghracer
From everything I've read and heard about this engine combo I would lean towards the converter not being the right stall. That seems to be the biggest issues


Well I finally put in a 7 inch converter and it picked up all most 2 tenths..9.07 @ 149 in 4000 da air..that was the ticket and I haven't tried leaving at higher rpm yet or a little more jet




Very nice!!!!!!!


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: How much are my small headers killing my performance [Re: Al_Alguire] #2543060
08/29/18 03:03 PM
08/29/18 03:03 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
Plymouth340  Offline OP
mopar

Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Originally Posted By Al_Alguire
FWIW the smallblock in the heads up car made over 1000 with a set of 1 7/8" 20 long primary headers on the dyno. Headers on the car are 1 7/8 to 2 to 2 /18". Car ran 8.0's last year at 2800.




had some headers built...1 7/8-2 1/8-2 1/4..didnt see much performance diff..converter made all the diff

Re: How much are my small headers killing my performance [Re: Thumperdart] #2543062
08/29/18 03:04 PM
08/29/18 03:04 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
Plymouth340  Offline OP
mopar

Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Originally Posted By Thumperdart
Originally Posted By Plymouth340
Originally Posted By pittsburghracer
From everything I've read and heard about this engine combo I would lean towards the converter not being the right stall. That seems to be the biggest issues


Well I finally put in a 7 inch converter and it picked up all most 2 tenths..9.07 @ 149 in 4000 da air..that was the ticket and I haven't tried leaving at higher rpm yet or a little more jet


What carb(s) are you running............



one 1200 cfm

Re: How much are my small headers killing my performance [Re: Plymouth340] #2543394
08/30/18 12:27 PM
08/30/18 12:27 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
master
gregsdart  Offline
master

Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
I agree on the horsepower being in the 700 range with current setup,given a decent chassis. First off, you say peak power is 9,000 and you shift at 8700? Peak torque is 7200 and stall is 7,000?
My deal makes peak power at 6900, and shift at 7450 and 2/3 at 7300, stall is 6200, but peak torque is 5,000! I dynoed the motor and it said 847 hp, car weighs 3065, i use 2078 Goodyear slicks that weigh 41 lbs each, and the car went 8.900 at 2100 da.
The point of all this info is if ypur tq and hp peaks are what you say, the stall and shift points may be a big part of the problem. Too low. Its dyno time! Get the real dope on the motor and go from there.

Last edited by gregsdart; 08/30/18 12:32 PM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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