SlickVert

iTrader: (5)

What do you all think about 347 vs 383 for a Drag Racing and a weekend Street car?

383 build with;
Callies 4” Stroke and 6.125 Rods
Diamond 3.905 custom reverse dome 7cc pistons
ET 215 Heads 58cc with 2.040/1.57 valves SCR 12 to 1
Fast 90/ 90
1 3/4 LT’s
M6
4.56 gears
Custom cam to try and carry the power to 7,200rpm
MAF less SD Tuning

Do you thing that the 383 would out ET and MPH a compare 347 engine with the same parts except the crank and cam?

Bob

1QuickT-A

iTrader: (12)

I definately think the 383 would out power the 347.. I'm a firm believer in that old saying "there is no replacement for displacement!" And that saying is even more true when you're throwing a longer stroke into the mix..

Do a Search on Tony Mamo's 383 build that he did with a small solid roller and the AFR 225s..

skipperbisket

iTrader: (4)

you could run the same cam and everything on the 346, it would make a little less power probably. i personally if i have the choice would go with a 408 instead of a 383 since it's the same cost for either. my next build will be a 408 or bigger, currently running a 13:1cr 346 full drag setup.

1QuickT-A

iTrader: (12)

you got that right!

gator's 99TA

iTrader: (2)

for a DRAG car i would stay away from the 408 iron block. nothing hurts you like weight on the nose. that extra 75+ lbs is killer.

saying that i dont like the 382" stroker motors. still stuck with the bullshit 3.89" bore (ok maybe 3.90 with the hone job) which means SMALL valves which means SMALL power. ofcourse there are exceptions but not my opion of a good combo. over square is not a good thing. 3.90 bore and 4.0" stroke is not good. power is made through the bore, not stroke. anyone telling you "a stroke is great for power" has no idea what they are talking about .

either go for a 347" ls1 or go for a 408 with a LOT of weight reduction up front.

skipperbisket

iTrader: (4)

haha, yeah, that extra weight is killer for drag cars. thats why all of the fastest LS1 cars in the country have iron 408s, ohio boys, icon formula, etc etc etc.... get real.

gator's 99TA

iTrader: (2)

big attitude. what does your car run again? it probably has an iron block in it too.

let me add nearly 100 lbs to the front of your car and see how she runs. lets try not to compare low 8 second cars with this guy...mmm..k?

1BADAIR

iTrader: (1)

don't they have 370's?
get a ls2 402

skipperbisket

iTrader: (4)

my current motor is an alum. block 347, 13:1cr, solid cam etc etc.... but the next one will be an iron block....and it'll be more than a 10 second drag radial street car thats for sure.

1QuickT-A

iTrader: (12)

I personally see no problems at all with the Iron Block LSX setups.. Yeah 75lbs on the nose isn't all that great.. BUT, almost every drag car out there has an Iron Block in it unless they spent a few g's on a aftermarket aluminum block and that is pretty rare except for the big cube stuff like 555, 632, 706, 738, 800+ cid guys.. So, I don't see what the big deal is. I think the gain from the stronger block outweighs the 75lb weight difference.

ls1408cp

iTrader: (37)

I would do a 347 setup and some spray. You would save some money plus you already have et215s which would work great.

gator's 99TA

iTrader: (2)

good thing i have a 9 second street radial car ....

anyways, ls1 guys go with iron blocks for hte big bore. resleaved alum motors are junk.

SlickVert

iTrader: (5)

408, No! I don’t want the extra weight up front. I am not even considering an Iron block.

402, I have a set of heads that are desided for a 3.900 bore, so I plan to stay with it and do a hone to 3.905.

If I was starting all over again, yes big bore, bigger heads with LS7 runners, different intake, ect. ect.

I have seen guys like Tony, Jason and few others with there 383 strokers, dyno HP numbers close to or better then many 402 and 408’s. but always Better then 99.9% of the all 346/347.

I have not seen anyone with track numbers (good or bad) for a 383 yet.

Dyno numbers are one thing and track ET and MPH are another.

My car already went high 10.s with the 346 and ET215 set-up with some valve train issues. I am looking to run mid 10’s or better with the parts I already have.

My question is, I am planning a forged bottom-end and using my ET 215 heads, is there any ET/MPH benefit of the extra stroke?

gator's 99TA

iTrader: (2)

that 215 head has a big set of valves on it? might look into valve shrouding. maybe not.

if you want 382" all stroke ls1 combos, search 383ss on here. he is a buddy of mine and is a 6 speed. runs 10.50s n/a and 10.1 on a small nitrous shot. car goes 1.45 60' - this is at an average track and average to poor air conditions in KC.

skipperbisket

iTrader: (4)

9sec radial car? who cares....hell, it has an iron block in it too doesn't it?

mike#9

iTrader: (3)

A 383 should fun faster mph and times. You should be making more power with the cubes....which is going to get you down the track quicker. No added weight with the 383...so there is just added power!!!!

Loudmouth LS1

iTrader: (10)

LS1 Queen is a 383 Stroker, talk to her, her car runs real good.

Slow Z28

iTrader: (19)

I got a 382 all bore and it's doing fine

Preference wise, I'd do a high compression 347 if I had to do it over again. Especially since you have some things you are already working with that fit that application.

Chris

skipperbisket

iTrader: (4)

in my opinion either combo will make the power, the only reason i would step up to the 408 is that the cost would be the same and you're looking at 25 more cubic inches which is good for more power. a 383 or 382 done right with solid roller and bad *** heads have the potential to make 500rwhp+ any day of the week. i'm like SlowZ28 though, i like the high compression 347 for the time being (until i build a 408 that is)... My 13:1 347 should do ok...

skipperbisket

iTrader: (4)

by the way...when you do an all bore 382 does this require the block being sleeved or can it be done with a stock cylinder liner? if it does require new liners isn't that pretty expensive?