hey all, this is another best bang for buck thread, sorry. I was thinking of purchasing a 1974 for maverick with 302 and a c4. what is the stock hp? i was thinking of doing the cam, headers plus exhaust with 40 series flow masters, air filter and perhaps carb spacer, and perhaps roller rockers. what gains would be made and what mods could suppliment the mentioned mods. thanks warlord
302 Mod's The book says 140 bhp for the 74 302, this is a bit lower than the hp calculation that was earlier used. To answer your modifications, all would depend on many factors such as cam specs and intended use (street, strip or both). Use a good dual plane intake and good ign. system. Forget the carb spacer for now, not a real factor at the moment. Shift kit in the trans and a little deeper rear gear will do wonders for a mild built engine. Try to remember that whatever you add on must be matched to the other engine mods or spec's to get full benefit. As you gain your performance increases, then think about stall converter and aftermarket heads etc. When you mention roller rockers, you cannot use them on stock heads without adjustable type screw in studs. You can use the steel roller tip ones but the exact performance gain is questionable in my opinion. All goes back to what cam spec's and intended use etc. Good luck with your project and have fun doing it.
gees dave, you klnow heaps the car already has a single plane manifold and a 600bbl holley on it. also it has a different cam, the cam i want is a bit more wild, but still streetable. also the trans has been shift kitted for firmer shifts. they guy used the car for towing a caravan, i've been for a ride in it and it has really strong mid range. i want something that will do a mid to high 12 second pass, with out lighening (just so i can beat my mate in his mitsubishi evo 1)
Sorry, but you aren't going to get close to even 13 sec. with the set up you have and a cam change and exhaust won't do it either. The compression has to be bumped up well over 9 to1. much better heads a selected cam, gears, plus traction and tire help. There more to this than you think.
40 series Flowmasters I have 40 series Flowmasters on my 1971 Comet 302. I am highly satisfied. I am working on other hot rod options also. Ask the folks at Autokrafters.com for advice, also. I am running a mostly stock engine now and am loving changing things to increase horsepower. What is your opinion on the carburetor your are now running? I am running a Motorcraft rebuilt two barrel.
hmmm, my car at the moment, would be quicker than alot of mavericks in here (twin turbo subaru legacy gt jdm model) any way the car i was looking at has a 600bbl holley on top. I feel that this carb is adiquite, but not too large and not too small, because other areas in the engine are restictive there isn't any reason to go bigger. if say the valves were replaced with larger ones and the whole motor was balanced with large tube headers and all the rest then I would consider going to a 850 900bbl, and not much larger due to the smalll relitive displcaement of this engine.
Well, if the Subaru is so fast just use it to outrun your friend's Mitsubishi !!! One rice eating another rice!!
Respectfully, you need to get a better perspective on what is needed from an engine for the performance you expect. The 302 displacement will only flow a little over 600 cfm at 100% volumetric, at 6000 rpm. Since the engine is not 100% efficient, the flow is less. The 600 carb is enough in most cases. The use of a much larger carb will reduce flow losses at wide open throttle and add some top end power but hurt throttle response lower where most of the driving takes place ( on the primaries) besides the jetting work that would have to be done and resultant poor fuel milage. For 12 second quarter mile runs, the engine need to produce in the area of at least 300 hp. You need the mods as listed before, to even approch that figure in power. Then there is suspension setup, torque convertor, tires etc. Good luck with your car.
Yes my subaru is damn fast... but, it won't run 12.6 seconds, i cant dump the clutch (busted gear box) and i hate jap cars. I want to return to the "roots" of motoring, not that i am saying that a v8 is old tech or anything like that and no disrespect ment. I love V8's and i have always wanted one, if it wasn't for outside opinions such as "big heavy tank" I would have bought one. so for a 12 second i was thinking of this list. air filter cam headers and exhaust increased compresion nos tires 90/10 shocks what do you think? aside from the facts before i love this type of car because there is not nasty technology to confuse me and i can do alot of work on it myself.
Remember everything works as a system. Don't buy a cam too big for your setup, or too big a carb either. A big cam and carb will only work well with more performance oriented heads, exhaust, intake, etc. http://www.auburnextremeracing.com/drivers/charlie/ The above link shows my modifications. I have not yet run with the Cal-Tracs or X303 camshaft yet. I'm pretty close to your goals. I think you need to add gears to the list, and a converter.
commetgt1974, thats an interesting propostition, that page is bookmarked now. anyway i just got that dyno program and it says that the stock 302 makes 200 hp @ 4000 to 5000 rpm. by retarding the timing by 15 deg it makes 250 hp @ 5000 to 6000, but the cureve is alot flatter. in this instance the torque is about the same. now with the mod i am going to do, cam, exhaust inc headers , bigger valves (2.02 in and 1.6 ex) and raise the compression to 12:1 it says i should make about 350 hp@6000rpm and 35 lb/ft torque @5000 rpm. i will then upgrade the tyres and torque convertor. also this program is exactly the same as ihra dragracing from bethsoft
well..... some of those computer dyno's at home software aren't entirely accurate, theres alot unaccounted for but it gives you sort've an idea. i was running a 302 pretty much stock except w/ edelbrock performer 289 intake, and edelbrock 600cfm 4bbl carb, 14" chrome air breather and 3" flowmaster exhaust...i was pretty happy with this essentially that with just that i could beat many ricers and sound better doing it without straining my engine!!!! after you get the hang of that and opportuinities arrose i bought a 347 stroker kit recently it is a big jump in power, but with using the same tires and rear gears i tend to sit still at the line! the 302 was set up great with 3.00 gears and 14" tires and a new tranny it will routinely chirp 2nd gear and launch off the line. everything has a place, live and learn, and everything coinsides with each other ex. new aluminum heads w/o buying a new cam, or new intake old carb. oh by the way it is a 1971 302 ~Dan~
