Re: My new heads are killing me need help
[Re: 70dusterjohn]
#2538601
08/19/18 05:34 PM
08/19/18 05:34 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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Just because the heads are better doesn’t automatically mean you jet up. You may be to Rich now or issues with the carb from sitting
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
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Re: My new heads are killing me need help
[Re: pittsburghracer]
#2538614
08/19/18 06:08 PM
08/19/18 06:08 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Just because the heads are better doesn’t automatically mean you jet up. You may be to Rich now or issues with the carb from sitting That was where I was heading. He thinks he's lean but he very well could be rich. The plugs would give a better idea which way to go.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: My new heads are killing me need help
[Re: 70dusterjohn]
#2538636
08/19/18 07:28 PM
08/19/18 07:28 PM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
mopar
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mopar
Joined: Feb 2017
Posts: 566
Texas
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Can you get or borrow and AFR guage? Can you get to a chassis dyno to get help in trouble shooting and dialing the car up? Is it blowing black smoke, a dog at idle/off idle. Somehow i think you would know if its "that" rich. Can you get someone to video a burn out and a run ? What does engine vacuum look like at idle in neutral and i gear?
Are the plugs black and sooty or white as snow?
How long did your fuel sit? Down here is "really, really" easy to have ones fuel turn to engine puke solution- wont run for squat. Checked floats/fuel pressure?
Is distributer locked out or on a timing curve- if on a curve, make sure curve is still intact( nothing gave up in distributer)
we recently had an MSD issue, actually the connector between distributer and msd box- i check that all the time now- grin.
Sure hope you can find your gremlin. How are water temps? Any pressure in the cooling system after the runs?
Last edited by RustyM; 08/19/18 07:37 PM.
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Re: My new heads are killing me need help
[Re: 70dusterjohn]
#2538658
08/19/18 08:15 PM
08/19/18 08:15 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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I’d see about borrowing a known good carb off a somewhat similar combo.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: My new heads are killing me need help
[Re: fast68plymouth]
#2538672
08/19/18 08:45 PM
08/19/18 08:45 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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Some guys laugh at me for never having an engine on a dyno in 44 years but having a RacePak in my car gives me info on every pass, not just in the dyno room.
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
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Re: My new heads are killing me need help
[Re: 70dusterjohn]
#2538687
08/19/18 09:16 PM
08/19/18 09:16 PM
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Joined: Jan 2003
Posts: 11,713 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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Which spark box are you using? The only thing i have ever had go bad that killed a ton of ET was a Digital 6 box. Took half a season to find the problem. Swapped it and car came back. It would cause a miss in second and third gear was the symptom
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: My new heads are killing me need help
[Re: Locomotion]
#2538700
08/19/18 09:44 PM
08/19/18 09:44 PM
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Joined: Jan 2003
Posts: 11,713 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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* Jet for MPH. * Squirters & pump cams for 60'
Be careful so one doesn't overlap the other. (i.e.: too much jet can mask a need for bigger squirters and/or a bigger (longer squirting) pump cam.
Smaller squirters will increase the duration of the squirt and bigger squirters will shorten the duration of a given pump cam. You don't want the squirt any longer or shorter than necessary because it will mess up the A/F ratio of the main metering system (jets). Yep. All that stuff contributes to optimal ET’s. But his car is off 8 tenths or more.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: My new heads are killing me need help
[Re: fast68plymouth]
#2538702
08/19/18 09:46 PM
08/19/18 09:46 PM
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Joined: Dec 2004
Posts: 10,554 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,554
Rittman Ohio
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I’d see about borrowing a known good carb off a somewhat similar combo.
John I have a good running 1050 Quickfuel I could let you use just to see if it changes at all. I work in Kent not to far from you. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: My new heads are killing me need help
[Re: 70dusterjohn]
#2538718
08/19/18 10:13 PM
08/19/18 10:13 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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I know you can’t compare carb to carb but my old high 9 oldschool (906 heads) build had 99 jets in my 1050 carb. My 8.50 build with 440-1 heads had 90-91’s Jets in the same carb
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
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