My buddies dad has a 67 Mustang fastback with the 390 in it and a 3 speed auto and he tells me itd destroy my car even though he hasnt ever been for a ride in it yet. I wouldnt put my money on winning, but i dont think itd be a huge difference in the 1/4. The engine is stock and rated at 335hp. My 89 5 speed has a few mods and the consensus around here seems to be that its making about 260hp, so im outgunned there anyways, but ive seen 1/4 mile numbers for a lot of those old cars stock and they werent too impressive, especially with an auto. Let me know what you guys think.

 

i think the 390s gotcha outclassed there

 

Depends on how that horsepower is calculated. 335HP rating in 67 is not the same as 335HP rating today (or in 89).

If it's the system used in 1967, it is flywheel without any accessories or even complete exhaust. If it's using today's system, it is at the flywheel with accessories and a proper exhaust system.

Difference can be 20%. Which would put the 67 at around 270.

Add in the automatic. Think you would have a close race.

Doubt it would be a thrashing.

 

Well it was 335hp from 1967. its the original engine i think. theyve had it in their garage since 1981 for some stupid reason.

 

good point Diamond. but then again, what'r the rear gears in each car?

i know stock 5-ohs had lile 2.73:1s.... what'd a GT 390 have? cuz thats another factor...

also, which one wieghs less?

 

 

Im not too sure about the 67, i think it probably has a 3.73 or maybe even a 4.11 cus most of those old cars are geared like that, mines a 2.73. As for the weight thing, mine is probably about as light as a GT can be, no options except tilt steering. Id guess the 390 is about 3400lbs and id say probably 3200 for mine, but i could be way off.

 

your's weighs under 3000lbs, like 2900. I believe
Their 67 has most likely lost alot of power from being old and original. Old autos are no good.
What are your gear ratios for your tranny, because I think it's unfair to judge soley through rear-end gearing since we are dealing with two differently geared transmissions.
In the end I really think you'll win it

 

i dunno, i think it'll be mighty close

try and get us some vid of the run

 

ManEHawke is right. A '67 390 stick would do 60 in 7.5 new with a quarter in the mid 14s. Factor in the auto and nearly 40 years and youre looking at absolute best case scenario high 7 seconds to sixty and low 15s. Your Fox, if well driven, should waste him.

 

well the 390 in 67 had 320hp.if it was a 3 speed auto it should be a c-4 which is a decent tranny for its age.i think it would come down to driver.

 

I'd warn him that in order the "thrash" you, he'd need to actually get that car out of the garage first. If it really hasn't moved in 24 years, it's either so immaculate he's afraid to get it rained on, or it's in such awful shape it's not really driveable I'd bet. Armchair racers are like armchair generals, there's plenty to go 'round, and they don't win victories...

 

Well, as far as i know the only time its been driven in the last decade for sure was to move it about a kilometer from their old house to their new one. Anyways, they bought it in 81 to restore but really it just needed a few body pieces and some paint, which they still havent done. If i can convince him to "borrow" it from daddy for a few minutes i'll see what i can do about getting some race footage.