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Discussion Starter #1
Its a 79 f100 4150lbs with me street/strip truck.
466 9.5:1 L2404 pistons
Comp XE284h
Crane Gold Race rockers
Weiand Stealth
1 3/4" headers 3" exhaust 40 series flowmasters
C6 TCI Streetfighter 3000 converter 3.70 gears 325/50-15 MT drag radials

With stock D0VE heads and an 850dp my best was a 12.73 @104 but it ran consistent 12.9s at 102-103.

Bolted on ported D0VEs with 2.19-1.73 valves and milled to 68cc and went 12.81 at 104. I borrowed a 1000hp from a friend and my best is down to a 12.57 at almost 106 with a little more in it. I could have worked with the 850 more but he offered the carb so I tried it. I have since put an O2 sensor in the exhaust and put the innovate wideband tuner on it and got my a/f to right around 13:1 but haven't ran it since. I also havent sprayed it at the track yet with the new carb but I will be this week.
 

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Didn't seem like much of a difference with the ported/big valve heads. I'm planning to put a comparable combo in my '64 Galaxie I wonder if the better heads are worth the money?

GT300TD
 

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Discussion Starter #4
I was definently hoping for more but what are you gonna do. I dont know who ported the heads. They looked good to me and it was a good deal so I picked em up. Figured they couldn't be worse then stock. I do believe the headers are holding me back some. I have 1 7/8 headers for it but im waiting because I want to get the exhaust redone with an x-pipe and some Magnaflow's or Dynomax's. I really want to go 10s on the bottle with the setup I have. I feel its possible but not sure if it will happen.
 

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I bought those heads off a guy who had them on his pulling truck. I don't know who ported them. Anyway these are the flow numbers that came with the heads:

28" H2O

Intake

.1 69
.2 135
.3 190
.4 262
.5 300
.6 313
.7 321

Exhaust

.1 55
.2 97
.3 134
.4 156
.5 172
.6 182
.7 188

We gave them a new valve job but didn't flow them. I will tell you this your headers are killing you at 1-3/4 ! Forget the 1-7/8, go to a 2"

Steve
 

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The smallish headers are hurting it for sure, but it sounds like the big improvement came from the larger carb.
Im sure the combo of the bigger carb, AND the ported heads helped. Get some bigger headers on there and the whole flow path will thank you!!

What intake?? carb spacer??
 

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Discussion Starter #7
68xr7cat said:
We gave them a new valve job but didn't flow them. I will tell you this your headers are killing you at 1-3/4 ! Forget the 1-7/8, go to a 2"
The biggest headers you can buy for a 2wd 73-79 f100 are 1 7/8 that I don't know of anyone who builds custom headers for a reasonable price.
TorinoStyle2 said:
What intake?? carb spacer??
It has a stealth on it with a 1" open phenolic spacer plus the 1/2" nos plate on top. That added a 1/2 a tenth and 1 mph when I put it on. I sprayed it on tuesday and the motor mount broke on the starting line on the 1st pass. At least it hooked :) I am fixing it now to drive it to Ocean City, Maryland for a big cruise type deal. I will run it again on Thursday so hopefully it will hold together.
 

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Discussion Starter #8
Went to the track tonight with 28x10.5w ET drags (usually run drag radials). It was kind of muggy. Best pass was a 11.41 at 116.39 1.59 60 ft 7.21 at 94.75 in the eighth. Spun a little every pass. Other passes were 11.45 and 11.48 at 116. My best ever 60 ft was a 1.55 and that was on radials.

I guess the suspension needs work. It has the rear on top of the springs with homemade slapper bars. It hooks at first then it unloads the tires and it spins for a couple feet. It has Summit 90/10 drag shocks in the front with stock 6 cyl springs and Chassis Tech 3"drop I beams. I will be ordering a set of custom Caltracs this week.
 

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What shocks do you have on the rear? How are your slapper bars adjusted? Where does the nose of your bars contact the spring? What are you using on the nose of the bar? The type of bar can make a big difference and to me the cal-tracs would be the way to go....D
 

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The rear shocks are shorter then stock replacement shocks. There isnt alot available because the shocks have a stud on top like the front shocks. They are at a 45 degree angle which I was told doesnt help much. The bars are adjusted 1/2" from the spring eye with a lakewood snubber. Here are some pics of the lift in the rear. The first pic is to show how it sits normally.




This pic is a 1.55 60 ft on drag radials.

 

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Hey there....those shocks may well be a problem but a 1.55 60' in that truck with a 3000 converter sounds very good to me. Is that with or without nitrous on the launch? Sounds like that is with you spraying it out of the hole...I would actually like to see how it would do if you adjusted out the clearance and gave it some preload on the right side. Not sure how that would work with the extra torque the nitrous gives you. Tuning out the fact that it hooks and then unloads could prove to be difficult. The weight is probably settling forward much too quickly. As for the shocks you will probably have to test different ones to find one that works better...or ya could change how and where they mount and run a different type. Keep us posted....D
 

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Discussion Starter #12
Thats spraying right off the line. Will only get a 1.65-1.7 leaving on motor and spraying. I will try to adjust the traction bars for next week because im goin to Orlando this weekend.
 

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Discussion Starter #14
justintx75 said:
man drop the flowmasters and watch your truck pick up
I will be picking up some dynomax or magnaflows ovals in the next month or so and putting on an x-pipe. Trying to quiet it up as well. Kind of loud for a street car.
 

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Discussion Starter #15
Went to the track last night after finally finding out the starting problem with my truck. Turned out to be the pick-up in the msd distributor went bad. Also bolted the 850dp back on because my friend neeeded his 1000hp back. Changed nothing other than that. Made 3 passes on motor [email protected], [email protected], and [email protected]

This is a break-up of my best pass
1.72 60ft
5.04 330
7.84 1/8
86.75 mph
10.30 1000
12.424 1/4
106.36 mph

My worst 60 ft of the night was my previous best 1.77 and it also went a 1.75. Ran the et street radials with alot of air 28lbs and it was hooking even though it was in the mid 30s. The cold air no doubt made in difference in performance but it still felt great to go faster. Id say the heads picked up 3 tenths and 2 mph over the previous stock head best in the same weather conditions whick isn't too bad.
 

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wow! if you put that 1000hp back on coupled with a change of mufflers and 2 inch headers that things gonna fly. wonder how that combo would do in a 3000lb foxbody. :idea: good job guy.
 

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Those actually arent bad '60 times on that tire.Im sure you can get down into the 1.6's with some more tuning,but im sure the florida weather treated you good :D
 

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headers

Hi Dropped, great looking truck. reminds me of the 79 i used to have. I love that bodystyle.

I don't know of anyone who builds custom headers for a reasonable price.
I used to wonder why custom header prices seemed so "unreasonable" too. This summer I fabbed a custom set of 2 1/4" for my car. :shock:
I don't have too wonder anymore, "reasonable" is definetly a relative term. :wink:
Anyway I think the 2" would make a good difference. Keep on truckin.
 

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Only problem is the biggest headers they make is 1-7/8 for the 2wd F150. The 2" is a fenderwell exit header made for the 4wd.

I'm pretty sure the passanger side will work but the driver side will probably need some good mods to fit. (Steering box is up high on the 2wd, where the 4wd the steering box is down low and infront of the axle.) I wish someone would try the 4wd 2" headers and see how much reshaping is involved.
 
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