Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Engine Swap
Register Forgot Password?

Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 06-25-2011, 12:33 AM   #1
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
305 vortec heads on 350 sbc, will it work?

ok so i've got this 1984 chevorlet 350 motor, i was wondering if i could take the vortec heads off of my 1990 305 and put on the 350, would it work, or would i have problems with oil and water?
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 02:59 AM   #2
Member
 
Join Date: Feb 2011
Location: Virginia
Posts: 311
Car: 85 camaro z28
Engine: 355
Transmission: t-5
Axle/Gears: 3.73

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

Don't put 305 heads on a 350, thats just silly.

Just my 2 cents.
NathanLewis is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 03:03 AM   #3
Supreme Member
 
Join Date: Dec 2005
Location: Macon, GA
Posts: 6,063
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70

Classifieds Rating: (3)
Send a message via AIM to InfernalVortex
Re: 305 vortec heads on 350 sbc, will it work?

What did the 350 come out? The 305 heads may work well, they may not. I dont know much about the 305 Vortecs beyond that they have nothing to little in common with the 906/062 350 Vortec heads other than the bolt/intake port pattern. They'll have smaller intake/exh valves for less flow, and a smaller chamber for higher compression. I dont know enough about their flowrates to say whether they'd be as good as some LB9 305 heads, but if they're the same it wouldnt be a bad idea to put larger valves in them if you've got dished pistons in your 350 and your stock 350 heads are smogger style junk. 1984 was around the time they were starting to get their **** together so they may not be too bad, but it just depends on a lot of things.
InfernalVortex is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 09:06 AM   #4
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

It's just gunna be temporary,until i can get me a set of good aluminum edelbrock heads
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 10:00 AM   #5
Supreme Member
 
BlackenedBird's Avatar
 
Join Date: Mar 2011
Location: Central Texas
Posts: 2,891
Car: GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: Aussie 9-bolt/3.27 posi

Classifieds Rating: (5)
Re: 305 vortec heads on 350 sbc, will it work?

Your 84 intake won't fit the Vortec heads. So your "temporary" solution would cost a little more coin because you'd have to buy a new intake.
BlackenedBird is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 11:00 AM   #6
Member
 
bluers91's Avatar
 
Join Date: Dec 2005
Location: Wild Blue Yonder
Posts: 387
Car: 1991 RS Camaro
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42 Posi

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

They didn't make vortec heads in 90. Which casting numbers you got?
bluers91 is offline vBGarage Page   Reply With Quote
Old 06-25-2011, 04:33 PM   #7
Senior Member
 
Join Date: May 2011
Location: in a huge granite cave
Posts: 1,198
Car: '84 & '86 Camaros
Engine: building turbo 5.3L, & 3.4L
Transmission: 4L80E & 700R-4
Axle/Gears: TBD & 3.42:1

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

The '90 305 TBI heads are swirl-port. No flow. For mild commuting, they are tolerable up to 3500-4000 rpm.
ronnjonn is offline vBGarage Page   Reply With Quote
Old 06-26-2011, 05:16 PM   #8
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

idk the casting numbers... but they guy i got the car from said it was all original, his son smacked into a tree a few years back and hit it hard enough to break the distributor... so yea my temporary solution is gunna cost a little more than i expected, the heads are centerbolt heads, which i've always called vortec heads...
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 06-26-2011, 05:16 PM   #9
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

and i have the intake from the 305... once again "temporary"
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 06-26-2011, 06:04 PM   #10
Senior Member
 
Join Date: May 2011
Location: in a huge granite cave
Posts: 1,198
Car: '84 & '86 Camaros
Engine: building turbo 5.3L, & 3.4L
Transmission: 4L80E & 700R-4
Axle/Gears: TBD & 3.42:1

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

Quote:
Originally Posted by 1FSTBRD View Post
centerbolt heads, which i've always called vortec heads...
This is the fault of Chevrolet's marketing people. '87 was the first year of centerbolt heads, and all '87 TBI SBCs and 4.3s had high-swirl heads. The '87 4.3 got called the Vortec.
When car people refer to Vortec, we only care about the '96-up Vortec 350, with the high-flowing heads.
No other "Vortec" stuff is useful for high performance.
ronnjonn is offline vBGarage Page   Reply With Quote
Old 06-26-2011, 06:45 PM   #11
Member
 
Join Date: Jun 2010
Location: Tucson, AZ
Posts: 301
Car: 89 Formula
Engine: 305 (LO3)
Transmission: 700R4
Axle/Gears: 2.73?

Classifieds Rating: (1)
Re: 305 vortec heads on 350 sbc, will it work?

Your 305 should be throttle body injected, no way to mount a carb.

Quote:
Originally Posted by 1FSTBRD View Post
and i have the intake from the 305... once again "temporary"
gwarren007 is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 03:28 PM   #12
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

ok... i'm real confused right now, so i'm gunna tell u everything that i have goin on to the 84 motor, i have the centerbolt heads, and intake from the 305 which is throttlebody... goin on to the 84 350 which is carbed... will it work
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 03:48 PM   #13
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,049
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

Yes, it will "work".

Now, "How well will it work?" is a different question. To answer that, we need more information about what this '84 350 is out of. If it was a truck, the pistons will most likely be dished, which means the smaller chambers of the 305 heads will be fine for a final compression ratio. However, if the 350 pistons are flat tops (even with the valve relief "eye brows"), the compression ratio will be too high with the small chamber 305 heads.

Taking the high-percentage guesses, here are my predictions:
- The heads will be fine because the 350 pistons are dished.
- You will need a different flexplate, because the 350 came from a truck with a 168-tooth flexplate, which won't work with your 305 starter (which would be best to use in a 3rd gen), and the 305 flexplate won't work because the '90 305 is 1-piece rear main seal, and the '84 350 is 2-piece rear main seal. Simple solution - go to your nearest chain parts store and get a flexplate for an '84 3rd gen V8 auto transmission (don't tell them it is a 350, because their computer won't show a 3rd gen f-body 350 in model year '84; and it doesn't matter, because a 305 or 350 of the same year will use the same flexplate).
- The car won't run very well with a 350 and 305 tuning, and 350 with 305 exhaust. But, it will run.
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 03:54 PM   #14
Supreme Member
 
Orr89RocZ's Avatar
 
Join Date: Sep 2003
Location: Pittsburgh PA
Posts: 19,845
Car: 89 Iroc-z
Engine: Twin Turbo 401
Transmission: TH400
Axle/Gears: 4th gen 12 bolt 3.42

Classifieds Rating: (20)

Send a message via AIM to Orr89RocZ
Re: 305 vortec heads on 350 sbc, will it work?

You can put them on, and it will run just fine...just dont expect much out of it.

Only thing you may need to watch is compression, i'm not sure what the cc chambers are on the 305 castings, but if they are 58cc then you may run into high compression on iron heads with small cam so it may not like pump gas, especially with any kind of timing advance in it. I know the later 80's 350's had 12cc dish pistons so 58 cc would put you at 10 to 1 which is high for iron heads...usually need a decent sized cam to be ok on pump gas.

What do the pistons look like in the 84?

edit; I've been tree'd see above post
__________________
1989 Twin Turbo IROC-Z
"Twin Turbo 401 Buildup Pics "
Photobucket 401 Twin Turbo
1009 whp / 844 wtq 24.5 psi pump gas only
Orr89RocZ is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 04:20 PM   #15
Junior Member
 
N.J.-SLICK-1's Avatar
 
Join Date: Dec 2004
Location: dirty jerzee
Posts: 91
Car: 92 camaro R.S.
Engine: 406 Carbed
Transmission: T-400
Axle/Gears: 3.73 limited slip

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

Quote:
Originally Posted by bluers91 View Post
They didn't make vortec heads in 90. Which casting numbers you got?
Thank you, thats exactly what I was thinking, they came out in 1996 up to 2000 if I'm correct?

Last edited by N.J.-SLICK-1; 06-27-2011 at 04:23 PM.
N.J.-SLICK-1 is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 04:29 PM   #16
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,049
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

The "good" Vortec castings are 906 and 062, came on light truck 350's from '96-'99, with a few in 1 ton trucks in '00.

The only thing you "need" to know is the casting # - if it isn't 906 or 062, you don't have the "good" Vortec heads.
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 04:31 PM   #17
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,049
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

Quote:
Originally Posted by Orr89RocZ View Post
Only thing you may need to watch is compression, i'm not sure what the cc chambers are on the 305 castings, but if they are 58cc ...
All 3rd gen 305 heads had 58cc chambers (roughly - within normal factory tolerances).

Quote:
Originally Posted by Orr89RocZ View Post
edit; I've been tree'd see above post
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 07:30 PM   #18
Senior Member
 
Join Date: May 2011
Location: in a huge granite cave
Posts: 1,198
Car: '84 & '86 Camaros
Engine: building turbo 5.3L, & 3.4L
Transmission: 4L80E & 700R-4
Axle/Gears: TBD & 3.42:1

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

I thought CHP or Super Chevy reported that the LO3 heads were 55 cc, stock?
ronnjonn is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 07:51 PM   #19
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,049
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

They may have. Reports here vary from 54cc to 60cc. The "target" was supposedly 58cc.

My polished chamber (no unshrouding performed) World S/R 305's cc'd at 64.
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2011, 10:14 PM   #20
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

i've just decided to convert it to carb for right now, seeing as the 305 heads will need to be reworked... what all will i need to convert it to carb and electronic ignition?
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 07-26-2011, 02:08 AM   #21
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

crap 305 is out and gone, upgraded to a 4.8 ls based engine
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 07-26-2011, 03:13 AM   #22
Junior Member
 
Join Date: Sep 2010
Location: Maili HI
Posts: 64
Car: 1989 RS,1991 Z28
Engine: TargetMaster 350, L98 350
Transmission: 700R4
Axle/Gears: 10 bolt posi 2.73s, and 3.23s

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

lol well thats a ample solution. good job
DRock89RS is offline vBGarage Page   Reply With Quote
Old 07-26-2011, 03:27 AM   #23
Member
 
Join Date: May 2011
Location: Andalusia, AL
Posts: 285
Car: 1991 Camaro RS
Axle/Gears: Stock

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

Quote:
Originally Posted by DRock89RS View Post
lol well thats a ample solution. good job
1SICK90RS is offline vBGarage Page   Reply With Quote
Old 07-25-2012, 12:48 AM   #24
Member
 
Join Date: Jan 2009
Location: southern Pa
Posts: 119
Car: 87 GTA, 99 VFR800
Engine: 5.7 TPI wrong heads , 781cc
Transmission: 700R4
Axle/Gears: 3.08, msg me if u hav 3.42 4 sale

Classifieds Rating: (0)
Re: 305 vortec heads on 350 sbc, will it work?

I ran 14.35 with my L98 and 305 heads. I have yet to learn more about mine since I just bought it. I had some questions regarding this though.

http://www.thirdgen.org/techboard/tp...ml#post5335993 (Upgrade heads)
TA-Rocks is offline vBGarage Page   Reply With Quote
Old 07-25-2012, 12:48 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Engine Swap

Tags
1984, 1992, 305, 350, chevy, exchange, head, heads, intake, lti, parts, put, sbc, vortec, years
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 03:25 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.5.2
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details