Hermes

I was doing some research on the C5R block, and it's possibilites. The bore/stroke info seems to be somewhat sketchy. So far, the biggest stroke I have found is the 4.250, and the biggest bore I've seen anyone say is possible is 4.160. This would give a displacement of 462.121 CI.

I just wanted to see if anyone knew of a C5R block pushed further than this, of if 462 is the limit. Thanks!

<img border="0" alt="[Camaro]" title="" src="graemlins/camaro.gif" />

ls1290

iTrader: (20)

I have heard that the C5R block could be pushed to 4.155" in bore going only N/A. I have not heard of anyone actually doing it though......

Ling_650vette

iTrader: (1)

I think the largest Gen III(not the Vortec 8100 496) motor i heard, was stretched to about 434 CID which is <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> imo. Hell, 422 and 427 CID is pretty astonishing w/ a small block. Not really sure if it was 434 or 432 CID...but i believe it was around there. If anyone else "knows" i'd welcome them proving me wrong <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

<small>[ October 18, 2002, 03:51 PM: Message edited by: Ling_650vette ]</small>

00blkws6

This is not C5R info, but I believe Nineball has a 434 from MTI. Check them/him out!
They are one of the only companies I would trust to do work with the cylinder liners.
Jay

<small>[ October 18, 2002, 04:49 PM: Message edited by: 00blkws6 ]</small>

really slow truck

I believe MTI is putting together a 471ci c5r setup for Colonel...

Dope

iTrader: (2)

Nine Ball's 434 is a LS1 block. I believe the biggest a C5R block can go is 471 (at the present).

Dope

1CAMWNDR

iTrader: (21)

Yes, the 471" C5R based engine Colonel is getting uses a 4.2" bore and a 4.25" stroke. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Sick isn't it <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

DONAIMIAN

iTrader: (18)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1CAMWNDR:
<strong>Yes, the 471" C5R based engine Colonel is getting uses a 4.2" bore and a 4.25" stroke. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Sick isn't it <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Sick??? <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" /> verry sick!!!!!, talk about pushing it.

Colonel

My two projects are getting confused.

The 471 (4.2 bore x 4.25 stroke) will be with an LS1 block and will be going in my '02 Z28 as a VERY streetable setup. The idea with this project is to go NA 10s without compromising idle quality, drivability, or reliability any more than slightly. We'll be using a very mild hydraulic cam for this displacement. Probably an X1 on a 116 LSA. Compression will be aimed at 93 octane. Shift points will be somewhere around 6100. I'm thinking it'll be about a year before this engine is built (going to use up some of that new car warranty first!)

The C5R is 434 CI (4.155 bore x 4" stroke) and was just planted under the hood of my '00 Z28 last week. It is an all out race effort that will spin somewhere in the neighborhood of 9000 RPM.

Fenris Ulf

Colonel, why in the world are you pushing the limits (going past them probably <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) with a 4.200" bore and then choking the motor down with a puny cam like the X1?

Colonel

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fenris Ulf:
<strong>Colonel, why in the world are you pushing the limits (going past them probably <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) with a 4.200" bore and then choking the motor down with a puny cam like the X1?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">For the same reasons. Idle quality and drivability. It should still make about 500 RWHP and idle pretty close to a stock engine while doing it. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> Jayson Cohen (the owner of MTI) runs an X1 in his 422 (434?) powered 'Vette and absolutely LOVES it!

Fenris Ulf

I understand the idle part of it, but I seriously doubt a 4.200 bore is very streetable in terms of life expectancy, but all just idle speculation of course <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Best of luck with your cars Colonel!

Z-Rated

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Colonel:
<strong>It is an all out race effort that will spin somewhere in the neighborhood of 9000 RPM.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Dude thats freakin sick!! i really wish that i could hear that thing one day <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> good luck

Drew

ls1290

iTrader: (20)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1CAMWNDR:
<strong>Yes, the 471" C5R based engine Colonel is getting uses a 4.2" bore and a 4.25" stroke. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Wow!!! A 4.20" bore, those walls have to be darn thin <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Fahad

what will be happen with The 471ci for daily drive ?? or notyet...

I saw post before three days (maybe) , for someone her say , colonel will be go with C5R block and 481ci ???? is that correct.

Fahad..

Colonel

Thanks!

I'm not really dead set on a 4.2" bore. We'll decide between now and then if we think 4.2" will be reliable enough. I'm not really looking to build a 100,000 engine but at least 20,000 would be nice! So, it may end up being a 4.155" bore. I'll let Jayson make that call. If he tells me 4.2" will work well for awhile I'll try it.

Colonel

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fahad:
<strong>what will be happen with The 471ci for daily drive ?? or notyet...

I saw post before three days (maybe) , for someone her say , colonel will be go with C5R block and 481ci ???? is that correct.

Fahad..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Read my post in THIS thread. It's 6 posts up above yours. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

The C5R is 434CI and is in my '00 Z28 (track only car.) The 471CI will be an LS1 block and will be in my '02 Z28 (daily driven street car.)

Fenris Ulf

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

I'm not really dead set on a 4.2" bore. We'll decide between now and then if we think 4.2" will be reliable enough. I'm not really looking to build a 100,000 engine but at least 20,000 would be nice! So, it may end up being a 4.155" bore. I'll let Jayson make that call. If he tells me 4.2" will work well for awhile I'll try it.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">20k miles out of a 15k motor is ridiculous. I would trade a stock idle for three times the longevity of the motor and put up with a little lope any day.

Colonel

"20k miles out of a 15k motor is ridiculous. I would trade a stock idle for three times the longevity of the motor and put up with a little lope any day."

Well, I get bored easily! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I agree that for most people a loss of 11ci would be well worth the extra reliability. Might be worth it to me too. As I said, I'm not dead set on 4.2". If it means the difference between 20K miles and 75K miles then yeah, I'd go 4.155". That's not known at this point but will be fully discussed with Jayson before the call is made.

02 'Hawk

spin to 9K?!?!?!?

That's Winston Cup territory...

I thing Ryan Newman's Penske motor spins to 9200 at some tracks...