The factory version of the 305 Vortec is called the L30. The HP is 230Hp stock and the 350 version is 250Hp stock.

I dunno the stock Torque. Maybe someone else can find them.

This is the replacement crate engine: http://www.sdpc2000.com/cart.asp?act...tid=127&pid=98

The more well known vortec is the L31, the 350 version. Pablo, me, and some others were looking for L30 heads that we could bolt on with out needing to have them milled like the popular L31(350) version. Unfortunately when we finally found them it turn out they cost too much.

According to Jeff@SDPC:
"There are L30 vortec 305 heads. They are part number 12529180. They do not flow as well as the 350 heads, but they do have the 58 cc chambers. They cost $754.66 a pair. The 350 vortec heads flow better cost less and can be milled to get the compression needed."

So it turned out that the 350 Vortec heads were about $350 less because of the mass distribution of them. The L31 heads flow better than the L30 heads but need to be milled to get the compression back up. When your shortblock goes south you can keep the heads and put them on a 350 if they don't need replacing yet.
A combination that I would like to try is the Vortec heads, the Edelbrock Victor Jr. vortec intake, 670 Holley, and maybe an LT1 or LT4 cam.
Since I dont have TPI I'll probably do this setup on my next engine which will be 350+ sized.

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-Tas
'89 Formula WS6

305, TBI, auto, 14x3 chrome flat based open element with K&N, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz
ICQ 82881207


[This message has been edited by Tas (edited October 18, 2000).]

 

Sweet Tas. Didn't know that. So they are swapable to a 350 eh? Thats some info if anyone is going to build there 350 from the block up. They can throw on those heads for now on their 305 and throw them on there 350 block when they do that. Cool. But are they great heads for a 350 or are the better heads like Fast Burn or somethin that are better?

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Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor
-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone

http://hometown.aol.com/J007Golden/index2.html

[This message has been edited by 91Bird305 (edited October 18, 2000).]

 

They are all small block chevys. The milled heads(along with about everything else) are swapable. you just need to make sure the compression on the 350 is then not too high.

 

IMHO Fast burns are the best now short of maybe some AFR heads. Popular Hot Rodding compared L98 heads, to L31 heads, to Fast burns on a 350.

350 with 750 carb and some fat looking headers:
L98: 356 HP
408 TQ
L31: 390 HP
Fast burns: 432HP

the Vortecs are just like the Fast burns combustion chamber but the heads are made of cast iron and smaller valves.

[This message has been edited by Tas (edited October 18, 2000).]

 

Ok, cause I have heard Fast Burn are good heads. I see GMPP put them on their ZZ5. Makes less torque than the ZZ4 though. 385hp and 385lbs of torque compared with the ZZ4 with 355hp and 406lbs of torque.

 

ok so ur saying if i go to the dealer and order L30 heads i can bolt them up to my stock LO3 with no mods to n e thing and have 230 hp?

 

no the stock L03 exaust system sucks. it has dual 1&3/4 exaust manifold outlets to a single 2.25" intermedieate pipe. if you have exaust and an open elemnt on the L03 you are well into 200Hp territory for sure. To use Vortec heads you need a vortec intake and if you want to use your TBI and not carb on that intake you need an adapter plate. Like I said the 305 (L30)vortec heads aren't worth the money.
Tas

 

With my mods I should be over 180Hp or 190Hp for sure. I raced a 4.3L Vortec S-10. I just pulled on him on a LONG street.

------------------
-Tas
'89 Formula WS6

305, TBI, auto, 14x3 chrome flat based open element with K&N, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz
ICQ 82881207

 

Thats sweet. I raced a Dodge Stealth R/T rated at 222hp and I beat him by 1 1/2 car lengths. I didn't have some of the mods I had before. I think at the time, I had the exaust, no headers, had the pullies, geez, I can't remember, it was a cool race though. Oh, i know I had the 3:73's at the time and the tires. That helped. It was a race up to 85mph. It was cool.

------------------
Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor
-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone

http://hometown.aol.com/J007Golden/index2.html

 

The torque rating on the L30 is 285lbs.....

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88 IROC the best RS ever made!
well except for the B4C

 

those 4.3 vortec s10s are quick! especially with the 5-speed. my friend has one, and it screams. he has the open exhaust with no mufflers like the full sizes have...sounds pretty good.

-brian

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1991 Camaro RS
----------------------------------------------
Ultra Blue Metallic, T-Tops

GM 350 HO Crate Engine - Vortec Heads, Edelbrock Performer Vortec Intake, Holley 670 CFM Throttle Body, Open Air Cleaner w/14"x3" K&N, Edelbrock TES Headers, Edelbrock Victor Series Water Pump, Accell Superstock Wires, Cap, and Rotor, MSD Blaster Coil, Hypertech Fan Switch & Thermomaster Chip, AC Delco Rapidfires, 3" Cat Back, Flowmaster 40 Series Muffler

700R4 - 2,400 Stall Converter, Vette Servo, Shift Kit, B&M Super Cooler

Brian's 1991 RS

Central NY F-Body Association

z28boy@twcny.rr.com IM name: Z28 Boy