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I was a little shocked at the conclusion of my horsepower by many people on the forum. If I put all that work into a motor and only make 195 RWHP, what are stock 289/302s making to the ground?
 

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engine type 8 cylinder
90 degree, OHV
displacement 302 CID
foundry group Small block
maximum
horsepower 210 Bhp @ 4,400rpm
(1968)
220 Bhp @ 4,600rpm
(1969-70)
210 Bhp @ 4,600rpm
(1971)
141 Bhp @ 4,000rpm
(1972-73)

maximum
torque 310 lbs./ft. @ 2,800rpm
(1968)
300 lbs./ft. @ 2,600rpm
(1969-71)
242 lbs./ft. @ 2,000rpm
(1972-73)

max. compression ratio
(w/ service-type gaskets) 9.5:1 (before 2-68)
10.0:1 (from 2-68)
9.5:1 (69/70)
9.0:1 (71)
8.5:1 (72/73)

combustion chamber
(volume) 61.7cc - 64.7cc
(before 2-68)
52.0cc - 55.0cc
(from 2-68)
56.7cc - 59.7cc
(1969-73 models)


carburetor Autolite 2100 (2V)
(automatic choke)

Factory Spec's for a 200-1V engine type 6 cylinder
inline, OHV
displacement 200 CID
foundry group "Fairlane six"
maximum
horsepower




91 Bhp is the real HP of
the of the 200 six, Ford
adjusted the HP in 1972

116 Bhp @ 3,800rpm
(1964)
120 Bhp @ 4,400rpm
(1965 - 67)
115 Bhp @ 3,800rpm
(1968 - 69)
120 Bhp @ 4,000rpm
(1970)
115 Bhp @ 4,000rpm
(1971)
91 Bhp @ 4,000rpm
(1972-73)

maximum
torque 190 lbs./ft. @ 2,400rpm
(1965 - 67)
190 lbs./ft. @ 2,200rpm
(1968-70)
180 lbs./ft. @ 2,200rpm
(1971)
154 lbs./ft. @ 2,200rpm
(1972-73)

max. compression ratio
(w/ service-type gaskets) 9.2:1 (1965 - 68)
8.8:1 (1969)
8.3:1 (1972-73)

combustion chamber
(volume) 51.5cc - 54.0cc
(quench type)

carburetor Autolite 1100 (1V; 64 - 69)
Carter YF (1V; 70-73)
all automatic choke*
 

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A 68-69 302 2v is putting 220 hp to the crank so this means that it is putting about 180 hp to the ground, give or take a few.

I think your engine may be putting a few more horses than that...due to the small advantage in compression and a few other mods you have listed....the main limitation are the ability of the cylinder heads to flow...
and the size of the valves.

The main thing I would be eye balling is the timing, tuning of the carb and the rear gears to compliment your driving habits.

Keep in mind that there are other ways to gain some ponies....lighten the car, electric cooling fan, under drive pullies etc...

Now if you really wanted to wake that 302 up, you could get a set of powerheads or ones ported by thumper....

Huskinhano and I will agree that bang for your buck, the GT40P heads
are good flowing iron castings that help burn the mixture pretty clean.

These are a good bolt on that will bring compression up almost a whole half point. (60cc comb chambers)

Moving air makes horsepower.
 

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.......what are stock 289/302s making to the ground?
The short answer is.....not alot. And the best way to find out how much is a chassis dyno. I know more than a few people humbled by the experience of putting their "400+ horsepower" steet car on the rollers only to find out the truth.

The key is choosing the parts that work together to optimize the potential for reaching your performance goals.

Have a plan and have fun. :)
 

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ive seen a few dyno sheets on stock 289. they usually put out about 170 RWHP...
 
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