SPANKY LS1

iTrader: (24)

Assuming that all else was equal (engine mods, drivetrain, weather, etc) what kind of gains, both in HP and TQ, do the 382s produce vs the 346s, and at what RPM? (382 will produce more useable HP and TQ lower in RPMs, correct?) Assume a 346 H/C car makes 430RWHP, what will the 382 make with only change being cam size. (To make cam size proportionate to engine size. I.E.: 230/224 in 346 to ~244/236 in 382)

Or, is it simply calculated as ~10% more HP and TQ, due to ~10% increase in displacement.

I guess what I'm asking is, what could I expect to gain with a 382 All Bore, vs a full bolt on, heads and cam 346? Thanks, Shawn

Dean98TA

Correct me if I'm wrong, but it sounds like you are not expecting to do any head work for your 382?? That would be a mistake, IMO.

Why bother going with more cubes if you are going to starve them for air? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

If you want build your 382 right, then either way you go, you're looking at head work. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Godspeed

The world is changing, check out the G5X-2 thread about our 460+ RWHP heads/cam package for stock 346" motors.

Black Sunshine/ 00SS

iTrader: (1)

I dont think that he was inplying that he wasn't going to do heads along with the 382. The chambers would need to be enlarged to match the bore.

I have a 393 all bore being built right now. I have not come up with a cam yet, but I expect it to be somewhat mild compared to what I have now, as I want better manners. I'm expecting 440-450 HP/TQ with this cam (A4), & 300 on tap (n20)when it's needed <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

I think a motor like this will produce more TQ in the lower range that will be more useful on the street. How much lower in the powerband, I dont know. But I'm about to find out.

383ss

iTrader: (14)

my 382 stroker has about 30-50 more rwtq than most all out h/c 346 cars and I have mild heads. Hp numbers between the two are a lot closer though.

FASST

I'll probably get flamed for this, but IMO you won't make too much more with an all-bore 382 than with a 346. I say that because, there has been allot of work with H/C combos that work on 346s...not nearly as much with a 382. Sure there are some stout 382 setups out there, but the level of development is lower with a 382 than a 346. Therefore, I'd say on average, assuming proper head work and cam selection you might put down an extra ~20hp with the larger cubes. Is that worth the price?...you be the judge.

rob-ss

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Talon WS6:
<strong> I have a 382 all bore and with no tuning through my 12 bolt 4.10's it made 446 RWHP and 440 RWTQ

My old stage one setup made 406 RWHP and 388 RWTQ through a 10 bolt 3.73's tuned

Im running a thunder 230/224 in the 382 but might step it up to something a bit larger but it makes the power down low where i need it.

Tom M. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Tom I sent you a p.m.

VINCE

iTrader: (1)

FASST.... The development you are talking about with the 346ci is all in the H/C package.. If you slap the same on top of a 382ci.. You will get 480rwhp or higher. MTI has already done this..

Ragtop 99

iTrader: (7)

I agree with Vince. The flow improvement on 346 heads will carryover to bigger cube motors. Maybe not 1:1, but the big cubes will make the power.

Joe Prince recently did a big bore that had a huge increase in torque in the midrange a nice gain over the typical big cammed 346 in top end HP. It was done with a mild cam. Thus you could have more TQ, more top end power and better drivability than most big cammed 346 packages.

I wish I did an all bore when I redid my motor. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

Linson

All bore?
what does that mean?

G Atsma

As opposed to both bore and stroke being changed.

99 Black Bird T/A

iTrader: (4)

Note this thread is from 2003.

All Bore was typically refering to an early resleeved LS1/LS6 often with stock crank & rods from back in the early days. Many of the early resleeve all bore set ups had issues with coolant leaks & head gaskets. Lots of Barrs Leak was a common band aid back in the early days for many of the set ups. Joe Prince's resleeve stuff was among the very worst with problems.

Steve Dumarjin of R.E.D. developed the Darton MOD sleeves that resolved the sleeving issues with quality machine work and made resleeved blocks a success. ERL & RED do top notch work based on what I've read and seen.

Darth_V8r

iTrader: (4)

This has been my general observation as well. A 346 won't be able to make more than about 430-440 lbs of torque, but the longer stroke 383 can get 460-470 torque. There's a 383 build on here with an almost identical top end as mine, and thats what we've been predicting. We'll be very close on peak HP, but mine will peak at a higher RPM than his. On the upshift, he should be 30-ish higher torque vs me.

Even more to this -- bore shrouds intake valves, which restricts flow. As you open the bore, the heads flow better. Look at all the flow bench stuff out there. You'll find some guys report their flow numbers on 4.060"+ bore plates, but if you put the heads on a 3.9, you won't get those numbers. In fact, when I start comparing heads, I also look at the bore plate used on the flow bench. All things equal, the highest flow on the smallest plate is what I look for.

There are some LS7 destroked to 388 getting serious numbers and revving to the moon. Personally, if I was doing a 383, I'd go all bore vs stroke every time. That gives you the option to use LS7 heads - and their aftermarket varieties.

kinglt-1

iTrader: (26)

bigger bore is where it's at... just costs a good bit to resleeve the block properly which is why it has not been popular around here in the last 12yrs.