I was just thinking on how alot of the ls1 peeps like doing the 382 all bore rather than stroking it. From my understanding is that you get more hp and less torque from an all bore motor?. the motor I plan on building is a blown low compression 383. it will be seeing in the near future around 12-15psi of boost. I was wondering which will be the better application..all bore? or stroked?.

Im kind of hesitant on going all bore as that would cause the block to be resleeved and I really dont want that. But if that gives me better results with my setup than I'll go with that. Thanks in advance.

Shawn

 

are you talking about an all bore 382 for a lt1??

 

http://web.camaross.com/forums/showt...threadid=99143

Check that thread out.

If you have a LT1 you can't do a All Bore.

IMO A street LS1 should be a stroked LS1 because the block will have alot less problems and the assembly should cost less too.

That tread has all of my thoughts on bore vs stroke.

Bret

 

In general yes it will have some more top end vs tq, its been awhile but a comparison between a 377 destroked 400, and a 383 put the 377 on top in terms of slight overall HP gains.

But having a thin bore, is going to allow the block to flex a bit, and since it would be a higher RPM setup, besides the computer cost for going beyond 7000, you look at reliability. Thats alot of what is so great about cubes, you dont have to rev to the moon to make the power, so rings/bearings can last longer and you can enjoy some bottom end, think Viper

So, my own preference would be to stroke it. Even though you can buy another block down the road if need be, I never really understood why people maxed out thier bores right off the bat in a rebuild, like a 468 etc, if you have the dough maybe thats fine, but a couple extra cubes doesn't seem to make it worth it. Street engine with great power vs racey engine with slightly better top end is what I think it comes down to.

Since the LT1 is very limited on bore, you wont go very far.

 

what is the max bore on an LT1

 

So what your saying is that for my application which will be boosted, I should go with a stroked motor rather than a all bore motor?. I kind of though the same thing too but was just curiose as what would be more effcient for a boosted application.

 

For a boosted app I wouldn't go nuts on a stroker, although its of course been done. Mark Montalvo, amongst his many engines had a 422 stroked LT1 with blower (nobody was interested in doing a turbo setup with him) in an open road project.

I figure though, if your making up for cube deficit go 355 or 383, I wouldn't go bigger, but that is because I'd prefer to get some miles out of my cars and have fun on the street now and again, for a full on race project that wont see alot of miles then thats different. The Pontiac cars had some 4"+ stroked setups, but they had longer rods, and in an LT1 I dont think you'll be seeing nearly 7" rods in a 4"+ stroker.

With ring life and wear in mind, 355 or 383, but that is just one opinion of many. Compression ratio and strength of the piston would be somewhat limited in apps beyond 383, for a blown car. For sure though I would not max out the bore, since they will provide at least some rigidity to the block.

 

Had to laugh on that one.

Haven't you heard of deck spacers Mudge?
Weld them onto the deck of the block (you'll need a set that's ~1.1" or better) and bore/hone away. Then you can run your 7" rods.

Seriously though, for a boosted motor, just build a 383 with a good 5.7" rod and get on with other things. You'll most likely break something before a bit more cylinder wear plays it's part.

-Mindgame

 

yea man 383 is nice for a street motor.. plenty of power for steet def and a weekend to the track. If you wanna kill some of the torque keep the stock gear, although I recommend maybe a 3.42 (i dunno if you have an auto or manual)
built one for a friend that'll just spin the tires b/c the trans shifts hard and b/c of the 3.73's.
If you're going boosted though, try a 355, should be plenty