Just built my 306 and have been running it for about a month, the motor feels great, but i wanted to know about how much horsepower it would make based from your guys experience. I would also like to know what ETs could be realistic as well. I plan on putting it on a chassis dyno, but my budget is near none, due to my expenses. Here is the combo,

- 306 --
- flat top pistons 10.2:1 comp
- 66 289 heads, 54cc 1.84/1.5, gasket matched exaust, removed lips in the bowls
- Tri-y headers, cant remember tube diameters
- Comp cams 270H cam 224/224 duration 500/500 lift hydrolic flat tappet
- Performer intake manifold (want rpm air gap for this combo)
- holley 600cfm vacume secondary (want 650 double pumper)
- Accel Dual points (want...need MSD)

The car-----

- 66 Mustang coupe
- Aprox 3100lbs (read it as stock weight from factory)
- 3speed manual tranny, YES its a stick car, not auto (plan is a race built T5 tranny)
- 8in rear w/mini spool and 3.00:1 ratio (plan is a 9in w/4.11s)
- Tires 195/70/14, 24in tall, for ET purpse, assume it gets traction
- Slapper traction bars

Should be it, I would be happy with mid 13's on this combo, I wonder what a T5 and a 9in rear would do as well. I want to take the car to irwindale very soon to get some ETs, its only a 1/8th mile, but i would like to get into the 8.6-9 range with tunning and great driving, with the last motor i ran 2.25 60foot times on a open peg leg rear end and a 2.79:1 ratio. Not bad for the poor traction i would get anytime i would hit the gas.

Thanks guys any in-put would be great

---Anthony

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Under Construction 66 Coupe

289 V8 - 600cfm Holley - Tri-Y Headers - Flowmaster 2.5 dual exaust - Centerforce Dual Friction

quote:

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Originally posted by 66 Racer:
Thanks guys any in-put would be great

---Anthony

---

Anthony,

You may hit your goal after you do all your planned upgrades. But, with your current package "assuming perfect traction" which you're not gonna find, it'll be a little disappointing. Sorry,

But I, and everyone else that takes their car to the track the first time is expecting about 2 seconds quicker than it realy is.

A few months ago I was at the track and a first timer was there with a '72 mopar w/383, striped interior, tubbed, painted primer. I asked him what he thought it would run and he said "it'll run 13s" I told him he was dreaming. (politely of course)
He said "what do you think I'll run" and I said "a high 15". The next round he looked me up and showed me his time slip, he ran a 15.89.

So Anthony,
In the eigth mile I'm guessing you'll run a 10 your first time out , but you have the potential for much quicker times.

Don't let that discourage you, use it as motivation to prove me wrong.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

Well, I know the car will do better than 10 at the 1/8. I already ran that with my worn out 289 with open rear end. With the engine that i did 10 with, when i took it apart one top ring was actually in 2 pieces. Not to mention the open rear end, now i'll at least have a spool. The best, off the top of my head was 10.01 at 73mph But i do remember it being 10.01. My best 60' with the open rear was a 2.27 or so.

I do agree though, you always expect the car to run faster than it will though. Im hoping to get 8.7, but will probably end up with low 9's my 1st time.

Keep the info coming, i appriciate it all.

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Under Construction 66 Coupe

289 V8 - 600cfm Holley - Tri-Y Headers - Flowmaster 2.5 dual exaust - Centerforce Dual Friction

When I was at the track the there was another 65 set up a lot like mine.But he had a new motor with rpm Ebrock heads.Same rear gears and trans,he ran about .04 slower then me.Because he had small tires and no traction at all.

The thing I've learned from this site is get traction first then add more power.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

Hey guys,

I ran my car this thursday at irwindale dragstrip, its an 1/8th mile and the car ran better than everyone on the web predicted. Personally i think i can get it even faster with better driving, and definetly better tunning.

I dont have the time slip in fron of me now, but the time was

Shift points
1st- 5000
2nd- 6000 (at finish line)
3rd- n/a

ET: 8.87 (est 13.64 1/4 time) (ET x 2 / 1.3)
rt: .730's how embarassing (best is .502 )
60': 2.1
330
mph: 83mph, it was 83 or so.

2nd run:

My second run was embarrasing, heh heh, i gave it more gas but it just spun, im blaming the track though, it seemed like there was some kinda liquid on the floor, a nova with slicks left sideways too, and that guy knows how to drive his car. It was a 10.1sec run, i dont know how though but i remember the mph in the 80's as well.

3rd run :
shift points
1st- 6500
2nd- didnt look
3rd- n/a

ET- 9.07
rt- 700's
60'- 2.3
330-
mph- 81mph

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Under Construction 66 Coupe

289 V8 - 600cfm Holley - Tri-Y Headers - Flowmaster 2.5 dual exaust - Centerforce Dual Friction

---About the 8.87 run, another thing that added to my excitment was that I was the 1st run of the night and i was matched up with a 71 mach1 with a 429 cobra jet engine, Full options from the factory with slicks. A lot of people were telling me it would be a good race, the owner said i should be able to take him out, it was an all original number matching car. He ran 9.1 to my 8.87, i was so happy!

Just with driving i think i can get it down from 8.87 to at around 8.6, i have a feeling the mech advance on the distributor isnt doing the job where its at. With further tunning and jetting on the carb i wouldnt be surprised to see at least 8.5 on my ET's.

With slicks, gears, t5 tranny, rpm airgap, and 650 double pumper, ahhh.... , i cant wait to see what that will give me. Mid 7's ? Man i love these ford small blocks. I cant wait to see what my next engine build up will do. I might build another 306 before i go for a stroker engine.

I guess you guys have already noticed that i am very happy. This engine build up was on a SUPER limited budget, it just shows that you can get a respectable times on a budget.

---Anthony

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Under Construction 66 Coupe

289 V8 - 600cfm Holley - Tri-Y Headers - Flowmaster 2.5 dual exaust - Centerforce Dual Friction

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.