350 cu in LT5 - ZR-1 Net Registry Forums

BennieC. · 09-20-2014

What the highest horsepower can we get out of it. No force induction or NOS. Just naturally aspirated. The plenum and IH has been ported(siamesed). I'm in a process of installing SW headers and eliminating the Secondaries. I will change the injectors as well since car has 98k + miles on the clock. I will also install 4.09 gears. I'm also debating if I should just install the 385 cu.in. Lingenfelter built. Dynoed at 572 at the crank.

XfireZ51 · 09-20-2014

Let's say Mr. Polatsidis is north of 560 crank using a .85 factor.

Kevin · 09-20-2014

mid 400's at the tires

Schrade · 09-21-2014

Good question...

BennieC. · 09-21-2014

Quote:

Originally Posted by XfireZ51

Let's say Mr. Polatsidis is north of 560 crank using a .85 factor.

What mods was done to it? Is it streetable?

Quote:

Originally Posted by Kevin

mid 400's at the tires

And what was done to this also? Inquiring mind wants to know.

Paul Workman · 09-21-2014

I hope Pete chimes in, but IIRC Pete posted 474 rwhp before his last go-round of cam grinds. His signature has links to one of his 11.4x second quarter mile runs* at Great Lakes dragstrip; a performance level I've seen repeated several times at the Crown Point Corvette Club's annual Corvette Shootout (next one coming up in a week (9/28/14), as a matter of fact!) But, that was before he upped his cam profile a couple years ago.

*Since then Pete has come to within 0.04 seconds of breaking into the 10s with his latest round of mods to his street driven, NA, stock bottom 5.7 LT5.

Any more details, Pete will have to provide (as the FBI gang is sworn to secrecy on pain of a Greek death what goes on in Pete's garage!

)

Paul Workman · 09-21-2014

Ya posted this as I was typing...

Quote:

Originally Posted by BennieC.

What mods was done to it? Is it streetable?

I drove his car once - even got to hammer it on a tuning run while he monitored his laptop. It is very streetable! Idle is about 850 rpm with a mild chop, and it has manners in traffic like a stocker. A real sleeper, especially with the NPP valves.

I'll let Pete or Marc fill in porting specifications for the "500" package if one of them wants to. But, it is safe to say the top end is aggressively ported, long tube headers with 3" outlets into 3" exhausts and B&B mufflers (now fitted with NPP valves to minimize drone), It is cammed, and the phasing is optimized for best performance while remaining streetable.

XfireZ51 · 09-21-2014

Pete's ZR traps at 129+. It's also a bit lighter than the stock ZR w deletion of A/C for example. He's a good driver too.

Pete · 09-23-2014

I think if a LS motor can crank 500 rwhp from 350ci, I don't see why we couldn't get that from the 350ci LT5.

I think with some more compression among other things could be done but this will basicly be a race motor need to run hi octane/race gas and be loud.

Most want a nice quiet driver.
Pete

XfireZ51 · 09-23-2014

Quote:

Originally Posted by Pete

I think if a LS motor can crank 500 rwhp from 350ci, I don't see why we couldn't get that from the 350ci LT5.

I think with some more compression among other things could be done but this will basicly be a race motor need to run hi octane/race gas and be loud.

Most want a nice quiet driver.
Pete

Pete,

For me, the possibility of owning a 5.7L motor that is putting down upwards of 550chp and yet idle at 850-900rpm without sounding like a bathtub draining was what attracted me. Aesthetically, its a great looking motor and one that isn"t seen very often.

09-20-2014	#1
BennieC. Join Date: Feb 2013 Location: Sacramento Posts: 21	350 cu in LT5 What the highest horsepower can we get out of it. No force induction or NOS. Just naturally aspirated. The plenum and IH has been ported(siamesed). I'm in a process of installing SW headers and eliminating the Secondaries. I will change the injectors as well since car has 98k + miles on the clock. I will also install 4.09 gears. I'm also debating if I should just install the 385 cu.in. Lingenfelter built. Dynoed at 572 at the crank. Last edited by BennieC.; 09-22-2014 at 01:04 AM.

09-20-2014	#2
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,661	Re: 350 cu in LT5 Let's say Mr. Polatsidis is north of 560 crank using a .85 factor. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

09-20-2014	#3
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,633	Re: 350 cu in LT5 mid 400's at the tires __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

09-21-2014	#4
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: 350 cu in LT5 Good question... __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

09-21-2014	#6
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: 350 cu in LT5 I hope Pete chimes in, but IIRC Pete posted 474 rwhp before his last go-round of cam grinds. His signature has links to one of his 11.4x second quarter mile runs* at Great Lakes dragstrip; a performance level I've seen repeated several times at the Crown Point Corvette Club's annual Corvette Shootout (next one coming up in a week (9/28/14), as a matter of fact!) But, that was before he upped his cam profile a couple years ago. Since then Pete has come to within 0.04 seconds of breaking into the 10s with his latest round of mods to his street driven, NA, stock bottom 5.7 LT5. Any more details, Pete will have to provide (as the FBI gang is sworn to secrecy on pain of a Greek death what goes on in Pete's garage!* ) __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 09-21-2014 at 08:08 AM.

09-21-2014	#8
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,661	Re: 350 cu in LT5 Pete's ZR traps at 129+. It's also a bit lighter than the stock ZR w deletion of A/C for example. He's a good driver too. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

09-23-2014	#9
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,680	Re: 350 cu in LT5 I think if a LS motor can crank 500 rwhp from 350ci, I don't see why we couldn't get that from the 350ci LT5. I think with some more compression among other things could be done but this will basicly be a race motor need to run hi octane/race gas and be loud. Most want a nice quiet driver. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage