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I have a 78 308w (it is .40 overbored) with a HEI distributor, stock heads but the exhaust sides are ported, an aluminum intake manifold, and a 4 barrel carburetor. behind it is a C6 and a Ford 9 inch with 3.70 gears. What do you think it will make in horsepower and torque? By the way it has a 63 grille
Sorry, but a 302 2bbl with a stock hydraulic cam, even with the addition of an intake, 4 bbl & headers, IMO will not come close to 250.
Think about the '83/84 Mustang, when they first put a 4bbl carb on them, (and almost certainly more cam than earlier 2bbl engines), and they were something in the order of 175 HP........
If the OP neglected to mention the addition of a more aggressive cam, then the numbers would get better, but even the '85 5.0L with hydraulic roller cam was only rated @ ~225HP.............
The only book I have handy stops at 1975 but they didn't get any better by 1978. The most powerful 302 in 75 was in a t-bird and it had a whopping 129 hp. Any gains you got with the 4 barrel and a little porting will be lost to the internal friction in that C6. Those little engines can make impressive HP an torque but you have to throw a lot of parts at one to get it there.
There were good reasons Ford never put the 289 in trucks.
No torque.
Horsepower is a calculation: torque times RPM divided by 5252. Therefore, the faster an engine turns, the more horsepower it can (theoretically) make.
289-302's are rev happy torque-less small car motors. Reason: no stroke, which means no leverage for the exploding mixture to exert upon the crankshaft.
302 = 3" stroke - 290 ft/lbs
352 = 3.5" stroke - 350 ft/lbs
390 = 3.78" stroke - 390 to 427 ft/lbs
All of the above utilise 4" bore (390 4.05", pretty dang close)
Trust me, you WILL feel 50 ft/lbs of torque increase.
BTW, all the above is based on '69 specs (65 for 352) and my own experience.
The only book I have handy stops at 1975 but they didn't get any better by 1978. The most powerful 302 in 75 was in a t-bird and it had a whopping 129 hp.
The first year that Thunderbirds were available w/a 302 was 1977. 1972/76 Thunderbirds came with the 460.
The first year that Thunderbirds were available w/a 302 was 1977. 1972/76 Thunderbirds came with the 460.
You're right ND. I saw that they just listed all the Ford engines together after I typed that. But even the once mighty 460 had been detuned to 218 HP.
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and it had a whopping 129 hp.
