368 sleeves and pistons?? - ZR-1 Net Registry Forums

Paul Workman · 08-05-2009

I'm looking to LA Sleeve for info on 4.0" sleeves for the LT5, and am totally open to what and where to get pistons for the 368 conversion that work with the stock rods. Any info on which sleeve to order (fm LA Sleeve) or where and what part numbers for the pistons would be helpful. (The idea of a group purchase/discount comes to mind!)

That said, money is an object these days...

So, depending on what it would cost to get into a 368 will determine when that will be.

What say you gurus??

P.

Polo-1 · 08-05-2009

LA's $1100.00
JE's $1600-2200.00 (options)
Rods/Bal. $500.00
Block hone/clean $450.00

These are just quick #'s for you.
Stock Rods must be trim at the top end. Then everything balanced.

Paul Workman · 08-06-2009

Quote:

Originally Posted by Polo-1

LA's $1100.00
JE's $1600-2200.00 (options)
Rods/Bal. $500.00
Block hone/clean $450.00

These are just quick #'s for you.
Stock Rods must be trim at the top end. Then everything balanced.

Excellent info!

Thanks! I read your PM first, but now with this info, I know what direction to head...NEXT winter (2010-2011) project! That will give me time to bone up - beginning with pulling the motor now to fix whatever and time the cams. (Silly me...I still wanna drive it some this season! I've put less than 1000 miles on 'er this year so far, and that is very sad!

P.

Kevin · 08-06-2009

i need to learn to read. nothing to see here

Aurora40 · 08-06-2009

Wow, doesn't really sound like "while you are in there" kind of money. $4k just in parts?

While a 368 if you needed to freshen the motor anyway sounds cool, do they really make that kind of power for a "while you're in there" thing? It's only a 5% increase in displacement. Presumably it's about a 5% increase in power, or maybe 20whp. Is that about right?

Polo-1 · 08-06-2009

Quote:

Originally Posted by Aurora40

Presumably it's about a 5% increase in power, or maybe 20whp. Is that about right?

Most 368's also are 12:1 comp ratio.
With the 4" bore helping the unshrouding, the bump in compression helps it too.
Most 350's 490-510hp
Most 368's 530-560hp 560hp from added cams.

lbszr · 08-08-2009

Quote:

Originally Posted by Polo-1

Most 368's also are 12:1 comp ratio.
With the 4" bore helping the unshrouding, the bump in compression helps it too.
Most 350's 490-510hp
Most 368's 530-560hp 560hp from added cams.

Can pump gas still be ran with the 12:1?

Anybody know what the highest CR and still be on pump gas? Just
curious.

Polo-1 · 08-08-2009

All builders run 11.75 to 12.25:1 and run pump gas.

flyin ryan · 08-08-2009

Quote:

Originally Posted by lbszr

Can pump gas still be ran with the 12:1?

Anybody know what the highest CR and still be on pump gas? Just
curious.

LT-5 specifically or just any engine in general?

lbszr · 08-09-2009

Quote:

Originally Posted by flyin ryan

LT-5 specifically or just any engine in general?

Was just curious on lt5, found out the hard way 383 with hypereruetic keith black pistons dont hold up up to 10.5cr in a boat on pump gas, it still lasted quite(years, roller cam went in, it lasted 5 hours) a while till it broke the top land off the piston and wasn't room in cyl for it at 6000.

08-05-2009	#1
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	368 sleeves and pistons?? I'm looking to LA Sleeve for info on 4.0" sleeves for the LT5, and am totally open to what and where to get pistons for the 368 conversion that work with the stock rods. Any info on which sleeve to order (fm LA Sleeve) or where and what part numbers for the pistons would be helpful. (The idea of a group purchase/discount comes to mind!) That said, money is an object these days... So, depending on what it would cost to get into a 368 will determine when that will be. What say you gurus?? P.

08-05-2009	#2
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 956	Re: 368 sleeves and pistons?? LA's $1100.00 JE's $1600-2200.00 (options) Rods/Bal. $500.00 Block hone/clean $450.00 These are just quick #'s for you. Stock Rods must be trim at the top end. Then everything balanced.

08-06-2009	#4
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: 368 sleeves and pistons?? i need to learn to read. nothing to see here __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" Last edited by Kevin; 08-06-2009 at 01:35 PM.

08-06-2009	#5
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: 368 sleeves and pistons?? Wow, doesn't really sound like "while you are in there" kind of money. $4k just in parts? While a 368 if you needed to freshen the motor anyway sounds cool, do they really make that kind of power for a "while you're in there" thing? It's only a 5% increase in displacement. Presumably it's about a 5% increase in power, or maybe 20whp. Is that about right?

08-08-2009	#8
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 956	Re: 368 sleeves and pistons?? All builders run 11.75 to 12.25:1 and run pump gas.