What's a "Economical" way to increase our Displacement???? - Page 3 - ZR-1 Net Registry Forums

GOLDCYLON · 11-22-2012

380 bottom end with full top end porting including the heads and Long tube headers and petes cams = the biggest bang for the buck.

Pete · 11-22-2012

Quote:

Originally Posted by GOLDCYLON

380 bottom end with full top end porting including the heads and Long tube headers and petes cams = the biggest bang for the buck.

Have to agree with GC 380ci is the most economical big inch.
Heck i spend almost the same amount and still have stock 350ci

Every Z should have a 380 ci
It would be like LS3 but the LT3

Pete

GOLDCYLON · 11-22-2012

Quote:

Originally Posted by Pete

Have to agree with GC 380ci is the most economical big inch.
Heck i spend almost the same amount and still have stock 350ci

Every Z should have a 380 ci
It would be like LS3 but the LT3

Pete

I'm so happy my second 380 will be done by march

alnukem · 11-22-2012

What is cost difference between 4.00" & 4.125" completed bare block job? I don't know why I'm asking, I am sure I'd have to do the 4.125.

Polo-1 · 11-22-2012

Quote:

Originally Posted by Pete

Have to agree with GC 380ci is the most economical big inch.
Heck i spend almost the same amount and still have stock 350ci

Every Z should have a 380 ci
It would be like LS3 but the LT3

Pete

I'm thinking more like LT5.3

Polo-1 · 11-22-2012

Quote:

Originally Posted by alnukem

What is cost difference between 4.00" & 4.125" completed bare block job? I don't know why I'm asking, I am sure I'd have to do the 4.125.

$10k

4.00-4.020 $1,000-1,200 drop in LA sleeve. fits factory block. (368-382ci)

4.100-4.165 starts @ $8,500.00 block work (390-450ci)

For Me

If you want big cube go for the 380 then if needed more power hit it with N20

The LT5 really likes the cooling effect of the nitrous. Makes great power with 100-150 shot. RWTQ jumps well over 500 of a 350ci motor.

RICKYRJ1 · 11-22-2012

What kind of hp our we lookin at with a proper 380? Any reliability issues with a offset crank?

Polo-1 · 11-23-2012

A 380ci should be in the 475rwhp 430rwtq range. Better porting, intake cams...
I would think you could hit 500-515rwhp without too much problems.

Stock cranks have been offset ground forever. Most grinds are .100 as the normal cut. The LT5 offset started with Mike Ebert's 396ci motors, I think. The crank guy I used said it has a ton of meat in it and is a high quality unit. I went with 3.750 (3.66 stock) It looks like it can be pushed out 3.775 without any problems. The SBC small journal bearings come in .001 - .030 under size, so thats not a problem.

Like I have said before, I have done the MEGA $$$ 402ci build. If it were for me or anyone else, go for the 380 it's only a few hundred over the 368 build.

Paul Workman · 11-23-2012

Quote:

Originally Posted by Polo-1

A 380ci should be in the 475rwhp 430rwtq range. Better porting, intake cams...
I would think you could hit 500-515rwhp without too much problems.

Stock cranks have been offset ground forever. Most grinds are .100 as the normal cut. The LT5 offset started with Mike Ebert's 396ci motors, I think. The crank guy I used said it has a ton of meat in it and is a high quality unit. I went with 3.750 (3.66 stock) It looks like it can be pushed out 3.775 without any problems. The SBC small journal bearings come in .001 - .030 under size, so thats not a problem.

Like I have said before, I have done the MEGA $$$ 402ci build. If it were for me or anyone else, go for the 380 it's only a few hundred over the 368 build.

All very intoxicating, I must say. (Y'all got me starting to drool over a 380 w/ some cams now...

)

I ran some numbers based on rwhp/cid for fully ported350s w/intake cams for those of us with "mortal" 350s (est. 450 rwhp) and Pete's insane 474 rwhp 350. For a 380 ci the proportions work out to between 489 rwhp (w/cams) for us "normal" peeps, to 515 rwhp for a setup like Pete's. (He says he keeps the magic formula burried in a Mason jar in his backyard. Maybe that explains why there's so many little pot holes in his back yard...Spoze?)

Anywayz... north of 480 rwhp would make for a lot of low 11-sec LT5s when the team ZR-1 Net Registry makes a run on the club trophy next fall! (But, unless I win the lottery, I'll just have to be happy with my 500+hp, Nikasil 350 (oh, the horror!

)

Fun topic!

P.

Polo-1 · 11-23-2012

If you don't need a rebuild and money is tight, tickle that 350 with a nice 100-150 dry shot nitrous. Nothing like 3rd gear and given it a hit and having the 335's let loose on the street.

11-22-2012	#21
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,147	Re: What's a "Economical" way to increase our Displacement???? 380 bottom end with full top end porting including the heads and Long tube headers and petes cams = the biggest bang for the buck. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 11-22-2012 at 02:45 PM.

11-22-2012	#24
alnukem Join Date: Jan 2010 Location: Freedom Pa Posts: 275	Re: What's a "Economical" way to increase our Displacement???? What is cost difference between 4.00" & 4.125" completed bare block job? I don't know why I'm asking, I am sure I'd have to do the 4.125.

11-22-2012	#27
RICKYRJ1 Join Date: Dec 2005 Location: Tinton Falls, NJ Posts: 1,177	Re: What's a "Economical" way to increase our Displacement???? What kind of hp our we lookin at with a proper 380? Any reliability issues with a offset crank?

11-23-2012	#28
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 954	Re: What's a "Economical" way to increase our Displacement???? A 380ci should be in the 475rwhp 430rwtq range. Better porting, intake cams... I would think you could hit 500-515rwhp without too much problems. Stock cranks have been offset ground forever. Most grinds are .100 as the normal cut. The LT5 offset started with Mike Ebert's 396ci motors, I think. The crank guy I used said it has a ton of meat in it and is a high quality unit. I went with 3.750 (3.66 stock) It looks like it can be pushed out 3.775 without any problems. The SBC small journal bearings come in .001 - .030 under size, so thats not a problem. Like I have said before, I have done the MEGA $$$ 402ci build. If it were for me or anyone else, go for the 380 it's only a few hundred over the 368 build.

11-23-2012	#30
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 954	Re: What's a "Economical" way to increase our Displacement???? If you don't need a rebuild and money is tight, tickle that 350 with a nice 100-150 dry shot nitrous. Nothing like 3rd gear and given it a hit and having the 335's let loose on the street.