306 vs 308? vs 331

OonDeanisS · Feb 6, 2004

my brother just emailed me this...

hey do me a favor i cant post on stangnet....can you write something asking if i should go with a 306-308-331???? i dont know and i think that coast high performance has raised the price on the 331 so i think i might just go with the 306....and if thats the case, im ordering it like next week. but i kinda want peoples opinions, b/c im not sure what would be the best to do. thanks

Black331Stang · Feb 6, 2004

well if hes looking for an increase in HP over the 302 hes not gonna find it with the 306, a 308 is just a waste...so its between a 331 and 306. so if he wants significant power over the 302 go 331 cause 306 is the same thing

93steeda · Feb 6, 2004

I'd like to know the usual hp increase with a 306 myself.

5spd GT · Feb 6, 2004

93steeda said:
I'd like to know the usual hp increase with a 306 myself.

You could see anywhere from 4-10 horsepower depending on how bad you need a rebuild...usually no more than 4-5 horsepower...its practically the same...most people just do a 306 to get a freshened cylinder wall...

A 331 will definatly be a noticeable power gain...

David

N8Miller · Feb 6, 2004

As NitrousGt told me, "there is no replacement for displacement".

hearing that, i opted for the 331 over the 306. i only wish that i would have fully upraded my internals to a forged crank and I rods (maybe is H---which everone is better is the one i wisht hat i would have gotten)

Go 331 with a nice cam.

what mods are done to the car?

Black331Stang · Feb 6, 2004

H beam rods are good, y are u saying u want I's? u wouldnt be able to tell the difference. and what are u doing with your car. forged wont give u power, actually just more unwanted wieght unless u really gonna be beating the nuts off teh motor and throwing everything at it. did u get a shortblock form KC? if so how much was it?

There is Really NO difference ina 302 and 306...everyone is usualy like oooooooo 306. woopie, means $hit. maybe a few HP only cause by freshening up the motor not really more cubes. u wont feel a difference.

5.0 HOtrain · Feb 6, 2004

Well, apples for apples a 331 is only going to make around 25-30 more hp's than a 306. So depending on price difference go with whatever is in the budget. If I were doing a n/a motor under or around 400hp and was going to keep it that way, I would go with "I" beam rods, they are quit a bit lighter than the forged H-beam. I went all forged because I plan on making around 600+fwhp n/a and then add some nitrous on top of that. What's you're brothers plans/goals/future ideas, and most important, budget
mike.

N8Miller · Feb 6, 2004

Black331Stang said:
H beam rods are good, y are u saying u want I's? u wouldnt be able to tell the difference. and what are u doing with your car. forged wont give u power, actually just more unwanted wieght unless u really gonna be beating the nuts off teh motor and throwing everything at it. did u get a shortblock form KC? if so how much was it?

i know that the I beams wont make any more power, but it will give me more peace of mind when i start to spray on it. i know it will be fine with some good tuning, but i should have gotten them while the motor was being purchased.
yes, its aKC econo 331 stroker---around 2300ish. great investment.

Black331Stang · Feb 6, 2004

so the I beams are overall better than H beams???

No way only 30 HP more...yeah maybe if u shove all the stock crap parts back on. But the 331 can take alot better bigger, high flowing parts than a 306, resultingin more power. no comparison.

TIMMY2734 · Feb 6, 2004

i beams are lighter than h beams. And for a street car, i beams should be plenty strong, assuming that you use a quality rod. If you are using a stock block, than i beams and a good cast crank should be more than plenty. Usually, the first thing that will break in the short block is the block itself, not the crank or rods.

Heres a good thread about which is stronger
http://www.corral.net/forums/showthread.php?s=&threadid=375712

StreetStang37 · Feb 7, 2004

a 331 is only going to make about 10% more power than a 302 with the same setup.

JadeFalcon · Feb 7, 2004

what is with this 306 and 308 mystery, its just a bored over 302! its like 4 cubic inches!! Its like .82 horsepower! G#%@%^@$#^$#@&$%

OonDeanisS · Feb 7, 2004

his mods are as follows:

underdrive pullies
hooker headers
bassani off road X
flowmaster 2 chambers
3.73s
tremec 3550
steeda tri-ax
FRPP adj. clutch cable
FRPP heavy duty clutch
lightweight flywheel
FRPP 9mm wires
Performer heads
Performer RPM intake
1.6 roller rockers
F303 cam
FRPP timing chain
30 lb/hr injectors
Aeromotive Fuel pressure regulator
Eibach sway bars
Eibach road race springs
Eibach subframes
poly bushings
X drilled rotors
Koni 5-way adjustables
Corbeau seats
cold air intake
fluidyne 2 core heavy duty alum. radiator
alum. driveshaft & loop
75mm MAF
70mm TB
190 lph fuel pump
aluminum fan

Ryan91Saleen · Feb 7, 2004

would a gt40 motor work?

Black331Stang · Feb 7, 2004

holy sick avatar ryan...did whytry do that for u??

if those are his planned mods he will have a pretty stout 331. get a new custom cam and a 255lph fuel pump and he should be mid 300 RWHP.

StreetStang- so your telling me that a 302 will have 250 Hp and a 331 qould only make 275???? U have to think that a 331 will need more air, resulting in the acceptance of bigger/higher flowing parts which then results in more overall HP.

A 331 WILL have significant power OVER a 302/306

OonDeanisS · Feb 7, 2004

he has all that stuff now, the only planning hes doing is the engine size, and he thinks he'll be over 400 rwhp

306 vs 308? vs 331

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