Head work or Cam change?
#1512630
10/05/13 02:36 AM
10/05/13 02:36 AM
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Joined: Feb 2008
Posts: 128 West Michigan
76318dart
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okay let me start with I ran my best ET couple weeks ago with my dart. It ran 11.40 @ 116. My 60ft was a 1.58 and my 1/8 mile was 7.21 @ 94mph Heres my combo: 340 4inch stroke 571/571 248/256 Hyd roller' RHS heads 2.02/1.625 untouched 11:01 compression Edelbrock air gap Pro systems 830 cfm holley 904 Trans w/turbo action 10" stalls around 3800 8 3/4 373 gears 27in tall tire 3350lbs w/driver My question is I wanna get the car down to 11.00 range and was wondering what my best options would be to change?
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: mopartoby]
#1512632
10/05/13 02:52 AM
10/05/13 02:52 AM
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Joined: Feb 2008
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76318dart
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So single plane? and My heads should be fine the way they are? would You go with a solid roller?
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: 76318dart]
#1512633
10/05/13 03:07 AM
10/05/13 03:07 AM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
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I would tune what you have first, jetting, timing, shift points and starting line stall speed, tire pressure and then look at the chassis parts before messing with the motor, make sure it is maxed out all the way from the front bumper bolts to the rear bumper bolts before changing any other parts Concentrate on the 60 ft times first, make that baby moves hard the first 60 ft, as hard as you can get it to The first part I would look at changing once you get it maxed out is the converter, is this a street and strip car or race only? EDITED: what RPM are you crossing the finish line at now?
Last edited by Cab_Burge; 10/05/13 02:33 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Head work or Cam change?
[Re: viperblue72]
#1512635
10/05/13 07:35 AM
10/05/13 07:35 AM
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Joined: Feb 2008
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76318dart
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Its a street/strip converter. I cross the traps at 6000. I played with the timing and it ran best at 32-34 total. Where would be a good place to have my RHS heads ported at?
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: viperblue72]
#1512636
10/05/13 08:59 AM
10/05/13 08:59 AM
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Joined: Feb 2008
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76318dart
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Also my fuel system is a holley blue pump with 8an line to the carb. And my suspension is ss 002/003 springs with longer shocks and pinion snubber. And I have 90/10 shocks in the front.
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: 76318dart]
#1512637
10/05/13 09:55 AM
10/05/13 09:55 AM
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Joined: Feb 2005
Posts: 4,320 Prospect, PA
BSB67
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IMO, your current set-up is pretty well matched. It will be a bit of a challange to get what you want from one change. I think you would be best served, like you are planning, to find more power, but understanding that your suspension will become less ideal as the power goes up. With that said, you're looking for 40 hp or so. I would start with the heads. If you can live with more CR, get that too. This will help you every where in your current power range, and keep you from the "now I need more gear/converter/tire...." syndrome. The next item would be the cam, but again, I would not make a big change there for the same reason. A solid roller or FT with faster ramps similar or slightly larger specs as you have now. Unfortunately, this change would be $$$$.
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Re: Head work or Cam change?
[Re: Crizila]
#1512639
10/05/13 11:06 AM
10/05/13 11:06 AM
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Okay thanks. Anyone recommend someone that does a good job with RHS heads?
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: B3422W5]
#1512641
10/05/13 12:12 PM
10/05/13 12:12 PM
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Joined: Apr 2007
Posts: 2,028 Trumbull,CT.
jim sciortino
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If you port the heads, be sure to address the intake manifold...
You should treat the two as one unit, since the port goes from the throttle blade to the valve seat. So many people worry about ported heads yet leave the manifold, or carb as the choke.
Also, after you have the heads and manifold ported "correctly", you will need to adust the valve events to best take advantage of your newfound airflow. This usually affects mutltiple other areas, such as converter stall and rear gear ratios, etc....
In short, it's the combination that makes it quick.
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Re: Head work or Cam change?
[Re: jim sciortino]
#1512642
10/07/13 11:56 AM
10/07/13 11:56 AM
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76318dart
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Okay thanks. One other question do you that a single plane with help any?
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: 76318dart]
#1512643
10/07/13 12:22 PM
10/07/13 12:22 PM
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Joined: Jan 2003
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B3422W5
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I would think a weiand excellerator would work well. I have had excellent results with them. Nice intake.
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, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Head work or Cam change?
[Re: B3422W5]
#1512644
10/07/13 12:45 PM
10/07/13 12:45 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
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I think you're close to using all of the head you have now. If the gearing remians, I'd leave the intake, add a 950HP carb, and swap in a solid flat tappet with another 15° @ .050 and .030 more lift. I'd also plan to upgrade the convertor to a UCC custom 9" to work with the gears and street use and still give good track times. If you're not going to gear it, you'll need more steam but IMO a single plane will take some of the flatness from the torque curve which will hurt you.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Head work or Cam change?
[Re: moper]
#1512645
10/07/13 05:56 PM
10/07/13 05:56 PM
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Posts: 128 West Michigan
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Okay my carb right now is a 950hp but flows 830cfm.
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: 76318dart]
#1512646
10/07/13 06:23 PM
10/07/13 06:23 PM
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dannysbee
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Something Seems out of wack if you are turning 6000 in the traps and only running 117 mph with 3.73 gears. That seems like lots of slip.
Getting old just means you were smarter than some and luckier than others.
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Re: Head work or Cam change?
[Re: dannysbee]
#1512647
10/07/13 06:30 PM
10/07/13 06:30 PM
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Posts: 128 West Michigan
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Converter slipping too much? I shift the car at 6000 also.
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Head work or Cam change?
[Re: 76318dart]
#1512648
10/07/13 06:53 PM
10/07/13 06:53 PM
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Joined: Nov 2003
Posts: 5,160 Texas
dannysbee
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Hard to say from this end but if your tach is right you are losing 12 mph in slip. No slip should be about 5400 at 116 mph. I am figuring about 11.5 percent of slip.
Getting old just means you were smarter than some and luckier than others.
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Re: Head work or Cam change?
[Re: dannysbee]
#1512649
10/08/13 08:44 AM
10/08/13 08:44 AM
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Joined: Dec 2006
Posts: 1,178 Indy
FlyFish
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super stock
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I would port the heads first too. My combo is almost identical, but with ported Edelbrocks, less compression, smaller carb, and more converter...runs 10.7x's @ 123mph.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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