Vortec heads and older blocks? - Chevy Nova Forum
Visit our sponsor, National Nostalgic Nova
 
Steve's Nova Site is an automotive enthusiast website dedicated to the 1962 - 1979 Chevrolet Nova, Chevy II and Acadian automobiles. We work together to preserve, restore, drive, show, race and provide fellowship for these classic cars. This is one of the best places to find information about parts, rebuilding, restoration and racing. This website is not affiliated with GM, General Motors or Chevrolet in any capacity.

Go Back   Chevy Nova Forum > Body, Chassis and Mechanical > Drivetrain & Performance


StevesNovaSite.com is the premier Chevrolet Nova Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 25th-January-2010, 11:01 PM   #1
63Randy

Title: Nova Junior Member
iTrader: (1)
Status: Offline
Join Date: Nov 2007
Location: Los Angeles
Nova(s): 63 Coupe
Posts: 191
Vortec heads and older blocks?

Can anyone tell me if Vortec heads can be installed on a 1991 truck 350 block without modifications or if I do need to modify what mods do I need.

Thanks ahead of time ,
Randy
__________________

Ummm I Think I Broke It
Randy
  Reply With Quote
Sponsored Links
Advertisement
 
Old 25th-January-2010, 11:05 PM   #2
batman09

 
batman09's Avatar

Title: Nova Guru
iTrader: (94)
Status: Offline
Join Date: Jul 2004
Location: Alameda-Norcal
Nova(s): 1967 Ht & 1962 wagon
Posts: 17,219
Quote:
Originally Posted by 63Randy View Post
Can anyone tell me if Vortec heads can be installed on a 1991 truck 350 block without modifications or if I do need to modify what mods do I need.

Thanks ahead of time ,
Randy
You can...no mods...you just need to get a vortec intake manifold.bm
__________________

1967 Nova-----Ls3/4L70e
  Reply With Quote
Old 26th-January-2010, 06:27 AM   #3
63Randy

Title: Nova Junior Member
iTrader: (1)
Status: Offline
Join Date: Nov 2007
Location: Los Angeles
Nova(s): 63 Coupe
Posts: 191
Cool Thanks for the info
Randy
__________________

Ummm I Think I Broke It
Randy
  Reply With Quote
Old 26th-January-2010, 06:46 PM   #4
Dutch
 
Dutch's Avatar

Title: Nova Senior Member
iTrader: (0)
Status: Offline
Join Date: Oct 2009
Location: Richland, WA
Nova(s): 71 SS/74 Custom/74 Hatch
Posts: 435
Get the guided rocker arms, I just put vortec heads on a 74 350, I am not sure about a 91 but I would get the guided rockers just in case, and the only difference is the intake, I reccommend the Air gap, there have been some good aritcles on the power made from just the addition of vortec heads and an air gap intake.
__________________
"Street Legal, who's really looking?"
  Reply With Quote
Old 27th-January-2010, 11:33 AM   #5
arndog

Title: Nova Guru
iTrader: (3)
Status: Offline
Join Date: Feb 2004
Location: seattle,wa
Posts: 650
I thought it was possible to put a standard intake on vortech heads with some hole ovaling or something, can anyone confirm?

arndog
  Reply With Quote
Old 27th-January-2010, 12:12 PM   #6
BowtieGuy
 
BowtieGuy's Avatar

Title: Nova Guru
iTrader: (7)
Status: Online
Join Date: Nov 2007
Location: N.W.,Louisiana
Nova(s): O, But looking for one !!
Posts: 1,248
You can work the holes but you will most likely have sealing problems. Your best bet is to go ahead and get the correct intake for the Vortec heads. The other option is to go to Scroggin Dickey or another major Chevrolet parts dealer and GM per parts sale heads with both intake options. Thats the heads that I`ve just installed on my 3yr old crate 350. I shopped the sites and bought some NIB heads for cheap.
__________________
LSUGeaux Tigers ! Laissez Les Bon Temps Rouler ! Go Saints

Last edited by BowtieGuy; 28th-January-2010 at 12:52 AM.
  Reply With Quote
Old 27th-January-2010, 01:05 PM   #7
WildBillyT
 
WildBillyT's Avatar

Title: Nova Guru
iTrader: (6)
Status: Offline
Join Date: Jan 2009
Location: Raritan NJ
Nova(s): 1968 Nova SS
Posts: 3,530
Quote:
Originally Posted by arndog View Post
I thought it was possible to put a standard intake on vortech heads with some hole ovaling or something, can anyone confirm?

arndog
Quote:
Originally Posted by BowtieGuy View Post
You can work the holes but you will most likely have sealing problems. Your best bet is to go ahead and get the correct intake for the Vortech heads. The other option is to go to Scroggin Dickey or another major Chevrolet parts dealer and GM per parts sale heads with both intake options. Thats the heads that I`ve just installed on my 3yr old crate 350. I shopped the sites and bought some NIB heads for cheap.
You CAN do it but it's not a good idea.

As above, you can get non self aligned rocker arms and use them but you will have to open up the pushrod holes. Keep in mind that you can't get too crazy with the valve lift on a lot of the factory Vortecs (no h in GM Vortec ).
  Reply With Quote
Old 27th-January-2010, 03:32 PM   #8
NOGO
 
NOGO's Avatar

Title: Nova Guru
iTrader: (5)
Status: Offline
Join Date: Oct 1999
Location: LB
Posts: 3,364
Many people have different experiences with the max valve lift on the Vortec heads. Measure yourself before choosing a cam. Umbrella type valve guide seals will also allow a bit more clearance as well.
__________________
Corra su coche, no su boca!
  Reply With Quote
Old 27th-January-2010, 04:00 PM   #9
WildBillyT
 
WildBillyT's Avatar

Title: Nova Guru
iTrader: (6)
Status: Offline
Join Date: Jan 2009
Location: Raritan NJ
Nova(s): 1968 Nova SS
Posts: 3,530
Quote:
Originally Posted by NOGO View Post
Many people have different experiences with the max valve lift on the Vortec heads. Measure yourself before choosing a cam. Umbrella type valve guide seals will also allow a bit more clearance as well.
NOGO:

Yeah, that's actually why I said "most" and not "all". Some can't get much over .430 but others can get more like .480 or more. Measure yourself for sure.
  Reply With Quote
Old 27th-January-2010, 05:07 PM   #10
Chevy Kid

Title: Nova Guru
iTrader: (3)
Status: Offline
Join Date: Feb 2006
Location: Vacaville, CA
Nova(s): 1964 SS
Posts: 1,038
The Vortec intake has a complete different hole pattern than previous sbc's. The bolts are vertical and will not interchange with older heads.

Tim
__________________
67 Camaro RS
64 Nova SS
Nor-Cal Novas

"Pay attention, there's gonna be a test later"
  Reply With Quote
Old 28th-January-2010, 12:17 AM   #11
laser-red-nova
 
laser-red-nova's Avatar

Title: Nova Guru
iTrader: (5)
Status: Online
Join Date: Feb 2004
Location: El Cajon, Ca
Posts: 1,495
Fast burn heads are drilled for both intakes. Excellant heads
  Reply With Quote
Old 28th-January-2010, 12:56 AM   #12
BowtieGuy
 
BowtieGuy's Avatar

Title: Nova Guru
iTrader: (7)
Status: Online
Join Date: Nov 2007
Location: N.W.,Louisiana
Nova(s): O, But looking for one !!
Posts: 1,248
Thanks, I fixed the h in Vortec. The heads I just installed did have both intake patterns and had .530 springs. They were listed has ZZ5 heads on the GM performance part site from several years ago.
__________________
LSUGeaux Tigers ! Laissez Les Bon Temps Rouler ! Go Saints
  Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
vortec heads dude100 Drivetrain & Performance 2 27th-November-2009 08:24 AM
Newer SBC with older style heads 62Nova Drivetrain & Performance 3 6th-July-2009 10:11 PM
vortec heads gfercaks33 Drivetrain & Performance 13 23rd-December-2008 03:30 PM
Will 5.3 aluminum vortec heads work on older SBC? Marcellus Drivetrain & Performance 8 18th-December-2006 03:17 PM


Site best viewed set to 1024 x 768.

All times are GMT -4. The time now is 03:50 AM.

Custom Designed for Steve's Nova Site by: vBSkinworks

 
Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Lt

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.