I know Lunati is supposed to be the shiznat - but I see some other brands floating around on eBay for chump change..

Is there a "real" difference in quality here? I mean why not buy a no name crank for 250.00 vs a Lunati crank for 2,500.00 <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Have a look @ these on eBay and tell me what you guys think about these other brands..

Link to all 383s on eBay

School me.... I need info..

 

Those'd be great if you had a SBC for a motor. You have an LS1, and they won't work.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Bugblndr:
<strong>Those'd be great if you had a SBC for a motor. You have an LS1, and they won't work.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So a 382 is the only "stock bore" option eh?

 

The biggest crank I've heard about is a 4.25" stroke Lunati. That will get you 406ci with a stock bore. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I believe all Lunati strokes cost the same but, there may be extra balancing required with the 4.25" crank.

John

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XLR8NSS:
<strong>The biggest crank I've heard about is a 4.25" stroke Lunati.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I know that Lunati also makes a 4.125" Stroker crank too. 394 CID on a stock bore block, 414 CID on 4.0" bore block, 422 CID on a 4.04" bore block, and 436 CID on a 4.1" bore block.

 

undersquare sucks.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ryan:
<strong>undersquare sucks.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No, small cubes suck. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Everything is relative.

I think we may start seeing some nice undersquare motors with more people using the iron 6.0L block for strength and reliability. I think people just got turned off to strokers when the Lunati kit didn't perform very well. Porting techniques and LS1 knowledge has come a long way since then. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Take care.

John

 

yeah i know...but here's a good example.

SBC 302 vs. SBC 305. all things being equal the 302 performs better. just as the 382 vs. 382....all other things being equal. personnally i wouldnt want to have to do extra crap to increase flow and efficiency rather than just spend comparable money for an oversquare motor rather than an undersquare one. but i guess there are good performing under's out there...i guess.

 

I've only seen one that really had all the components to have a chance and it put down some nice numbers. It was an iron block 4.06" bore *4.125" stroke setup. It had a "small"(relativey <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> ) hydraulic cam with LS6 heads milled for around 11.4:1 cr. I think it dynoed around 480-490rwhp in a 6speed.

I'm currently having one built that is maybe just a touch hotter but, only with a 4.03" bore. I'm thinking real hard about having a reverse split cam in there to help intake flow out a little. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I will agree that the bigger bore motors have an advantage but, I'm wondering if you can actually feel the difference between 490 and 520 rwhp. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />

John <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by ls1290:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XLR8NSS:
<strong>The biggest crank I've heard about is a 4.25" stroke Lunati.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I know that Lunati also makes a 4.125" Stroker crank too. 394 CID on a stock bore block, 414 CID on 4.0" bore block, 422 CID on a 4.04" bore block, and 436 CID on a 4.1" bore block.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So where is the sweet spot on a stock bore motor? 383? I am going for reliability - not 500RWHP - not that it wouldnt be nice.. I just want a solid bottom end for a 450RWHP motor... All comments welcome..

 

Wasn't Callis or Scat coming out with a less expensive LS1 stroker crank a while back?

 

What about a square engine?
Say 3.90 bore +/- 5 and a 3.90 stroke.
U wouldnt need to unshroud the valves and I bet it would be a great power maker.

What cubic in would this make?
375?

JS

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JS:
<strong>What about a square engine?
Say 3.90 bore +/- 5 and a 3.90 stroke.
U wouldnt need to unshroud the valves and I bet it would be a great power maker.

What cubic in would this make?
375?

JS</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">~373 cubic inches. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

If your going to spend the money on a crank you might as well go big. The returns may be less the bigger you go on a stock bore but, I doubt it's going to make less power than a smaller stroke.

John

PS - Scat does make a crank but, I don't think its any cheaper than the others. There are 4-5 manufacturers making cranks for the LS1 now and the cheapest is still over 2000 dollars AFAIK.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 99 Black Bird T/A:
<strong>Wasn't Callis or Scat coming out with a less expensive LS1 stroker crank a while back?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I've seen ads now for Cola stroker cranks. They offer them in a variety of strokes.

The power isn't made in the bottom end anyways, it's in the heads. A good stroker crank will give you more torque though. I'm going with 6.0L heads and a Vortech, and later building a 6.0L block, and will probably go with a 4" crank. If I'm going to go with an aftermarket forged crank, I may as well go a little bigger and get some more out of it, especially since it won't cost any more to do so.

 

Ryan - no doubt about the cast crank. If they had built it and the price was right I would have one in a aluminum big bore block right now. There was a company in Australia making a cast crank but, I don't know when it will be out.

As I said I agree that the big bore motors have an advantage. I had to pick a point though(money wise) and stick to it. The iron block allowed me to go with a bigger bore over stock and put a little more into the heads which, IMO are more important than the bottom end for power production. I'm not sure how you come up with the same price for the big bore and an iron shortblock. There should be about a ~$1500+ difference. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

It would have been nice to lose the ~80#'s but, the project my motor is going in already has an iron block from the factory so it's no big deal. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

One other thing that kept me away from the resleeved motors was the chance that it might have integrity problems. I know people say its not that big a problem anymore but, not being close to any major shops I didn't want to take the chance.

In the end for me it came down to setting a goal and seeing how I could accomplish it given certain restrictions. I think the iron block will take care of my needs. If it doesn't I might just kick myself for not getting the biggest, baddest setup available. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Take care

John

PS - When AFR comes out with there new LS1 heads in a year or two I don't think 500+rwhp will be a problem on any block setup. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

i agree with the issue with re-sleeved blocks. but its preference...although i definately agree that the heads make the power, hense why i said the all bore will make more since more work can be done on the larger bore/head combo.

Tbyrne lists the lunati kit for 4100 bucks. i put 3500. Rapid motorsports says a resleeved bare block is 2600. the differnce in price is made up with pistons and rods which the lunati kit includes. granted, there are better/cheaper ways to do anything...but thats pretty damn close if you spend around 1600 for pistons/rods. this is just 382 v. 382. but say i did a 393 shorty and you did a 408+ shorty. after we bought blocks id be ahead and if you had to buy different pistons anyway....i still think they'd be pretty damn close.

Ryan

 

Does a LS1/LS6 block have to clearanced (like a SBC does) for the Lunati stroker crank?

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XLR8NSS:

PS - When AFR comes out with there new LS1 heads in a year or two I don't think 500+rwhp will be a problem on any block setup. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> [/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Any idea what the AFR LS1 heads might cost? I know new AFR Chevy Big Block heads start at about $1575 per pair bare...

<small>[ July 07, 2002, 05:31 PM: Message edited by: 99 Black Bird T/A ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 99 Black Bird T/A:
<strong>Does a LS1/LS6 block have to clearanced (like a SBC does) for the Lunati stroker crank?

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XLR8NSS:

PS - When AFR comes out with there new LS1 heads in a year or two I don't think 500+rwhp will be a problem on any block setup. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Any idea what the AFR LS1 heads might cost? I know new AFR Chevy Big Block heads start at about $1575 per pair bare...[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">These heads are a long way from production from what I heard. I'm sure pricing is not even being considered yet. Sorry.

John

 

Ryan - I think we are talking about two different setups or something. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I was thinking about an iron 422 and an aluminum 422. Both will need pistons/rods/crank. The fact is that the iron block cost less(4.03-06 bore) than the resleeved aluminum block.

Sorry for the confusion. I didn't realize what was being compared. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

John

<small>[ July 07, 2002, 05:46 PM: Message edited by: XLR8NSS ]</small>

 

yeah...thats what i figured. an aluminum 422 would be 1500+ more expensive. i was making the comparison of all bore vs. all stroke. i would optimally go for a 4" stroke CAST crank (one day, lol) and an iron 4.03" block. actually, i myself would like a cast 3.875" crank to go with a 3.905" bore stock block. forged pistons and rods.

dreaming again....