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1973 Javelin - 304 w/ 3 spd manual |
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Charles_Burgess 
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Joined: Mar/25/2015 Location: Austin Texas Status: Offline Points: 37 |
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 Topic: 1973 Javelin - 304 w/ 3 spd manualPosted: Mar/25/2015 at 8:23pm |
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Just purchased a 1973 Javelin - do not think it is the AMX version, has a 304 with spd manual. Have read a bit about other engines and trans that come with differenct Javelins, like this one because of solid, straight body, great interior. Will mess with it for a long time before changing but wondering if 360 or bigger would be a good engine swap for it - would it be a lot more power for the cost and effort, or is it better to modify the 304 which is all stock at this point.
Thanks,
Charles - Hill Country near Austin Texas |
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Sonic Silver
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Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7950 |
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Posted: Mar/25/2015 at 8:46pm |
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The 360 is a big improvement over a 304. In 1970, a 4 barrel 360 was rated 290 horsepower gross. The 2 barrel 304 was rated 210 horsepower. Add the 4 barrel and dual exhaust to the 304, and you might pick up 20-25 horsepower.
When the ratings changed to net horsepower in 1972, the difference was between 220 and 150 hp. |
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dltowers
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Posted: Mar/25/2015 at 9:17pm |
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Welcome Charles.
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Original Owner, 1974 Javelin:
360ci,2v,727TC. Motorola Multiplex with 8-Track. G4 Plum exterior with 421Q Black Uganda Interior. Purchased on July 16, 1974 from Hooker AMC, Sherman, TX for $4500.20 |
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purple72Gremlin
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Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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Posted: Mar/25/2015 at 9:22pm |
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a mild 360 will out run a 304. but if the 304 runs well, and you are happy with it, you could leave it in. BUT if you change to a 360 or 401, you must get the correct flywheel. a 304 flywheel will NOT work with a 360.
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nda racer
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Posted: Mar/25/2015 at 9:31pm |
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How much HP does it take to go 9/10 faster in the 1/4 mile?
That's how much faster I went with just slapping a 4bbl on a stock 304. |
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purple72Gremlin
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Posted: Mar/25/2015 at 9:42pm |
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nda racer
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Posted: Mar/25/2015 at 9:45pm |
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Eddy Performer and Holley 1850 600 Vac with the check ball removed. Stock spring and check ball still in, yeah only 5-6/10s
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Sonic Silver
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Posted: Mar/25/2015 at 11:28pm |
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uncljohn
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Posted: Mar/26/2015 at 12:12am |
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A 360 is just a nice engine all of the way around. Despite the family interchangeability between a 360 and the other engines, no matter pretty much what you do one of them, doing it to a 360 gives you a bigger bang for the buck and a lot more available parts are there as it was used for such a long period of time.
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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Charles_Burgess
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Joined: Mar/25/2015 Location: Austin Texas Status: Offline Points: 37 |
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Posted: Mar/26/2015 at 4:17am |
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Thanks for the welcome and some great initial suggestions! Any tips are appreciated, adding 4 barrel and dual makes great sense, then if I swap to a 360 down the road, I believe that the new Carb and exhaust would stay with it - If I get a new Edelbrock Intake to accomadate the new 4 barrel, not sure if that would also go on the 360. (great tip on change of flywheel).
I remember in high school days my chevelle with a 3 spd manual had just a 283 but it was plenty of power - It seemed like it had been geared special or maybe it was the 3 spd but you really felt the quickness and power in first 2 gears.
It will be great when my 73 Javelin gets here, I expect the same quick power at low gears, but adding 4 barrel and dual exhaust would be a fun first improvement to work on and it sounds like it would make a difference I could feel and certainly hear. What would be a good suggestion for a dual exhaust set up if I went with addtion of a 4 barrel to the 304 - headers to glass packs to resinators -small regular mufflers after the glass packs maybe? - would be going for best sound but not obnoxious and of course best for performance - thanks - it's great reading your comments!
 Charles
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nda racer wrote: