71 - 74 Corvette 454 Engine compartment size - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

71 - 74 Corvette 454 Engine compartment size

Reply
 
 
 
Thread Tools Search this Thread
Old 12-28-2011, 02:47 PM   #1
corvette_stingray
Junior Member
Thread Starter
 
Member Since: Dec 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default 71 - 74 Corvette 454 Engine compartment size

1974 C3 Corvette 350 engine swap to 74 BBC 454 truck 3999289 casting number for 454 engine.

* understanding that the 74 Corvette was the last year of the BBC 454 LS4 engine with Auto TH400 Tranny.

The question is: on a 71 - 74 Corvette is the Engine compartment size the either if the car was a SBC 350 or BBC 454 from factory.

Second part to question: is the Corvette Engine compartment size on a 71 -74 Corvette difeerent from a 75 - 79 corvette.

Please help, as I'm ready to shoehorn a 74 Truck 454 engine (3999289) into a 74 Corvette Stingray.

Last question: should I use a Short Water Pump vs Long Water Pump?

Thanks in Advance to all,
New Member
corvette_stingray is offline   Reply With Quote
Old 12-28-2011, 03:32 PM   #2
HamadUP
CF Senior Member
St. Jude Donor '08
Support Corvetteforum!
 
HamadUP's Avatar
 
Member Since: Jan 2003
Location: Doha
Posts: 2,860
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I believe engine compartment size is the same among the C3 years, so basically any C3 will be able to get a big block inside it.

You should use short w/p in that application, also you have to use a different oil pan and possibly intake.
HamadUP is offline   Reply With Quote
Old 12-29-2011, 12:59 PM   #3
Big Block Dave
CF Senior Member
 
Big Block Dave's Avatar
 
Member Since: Jun 2010
Location: Bellmore NY
Posts: 768
Thanked 8 Times in 8 Posts
Default

I could be wrong, but I beleive that the waterpump may also be Corvette specific, as opposed to standard short waterpump.

Personally I would spend the money in building a killer sbc before swapping in a BBC...its just a simpler package with a small block and far more convenient to work on....in addition to all the silly crap youd have to buy in bracketry and pulleys etc
Big Block Dave is offline   Reply With Quote
Old 12-29-2011, 04:03 PM   #4
Easy Mike
CF Senior Member
Support Corvetteforum!
Cruise-In II Veteran
 
Easy Mike's Avatar
 
Member Since: Jun 2000
Posts: 33,227
Thanks: 0
Thanked 298 Times in 281 Posts
Default

Quote:
Originally Posted by corvette_stingray View Post
...on a 71 - 74 Corvette is the Engine compartment size the either if the car was a SBC 350 or BBC 454 from factory...
Engine compartments are the same size.

Quote:
...is the Corvette Engine compartment size on a 71 -74 Corvette difeerent from a 75 - 79 corvette...
No.

Purchase the 74 assembly instruction manual (AIM) and follow the installation diagrams for the big block option. The AIM shows how they did it and will also list the various parts you will need for the swap.

You will need a big block radiator for cooling and big block front springs for the additional weight. Truck blocks are a little taller than passenger car blocks so you may need a low rise intake manifold for hood clearance.

Good luck.

Easy Mike is offline   Reply With Quote
Old 12-29-2011, 05:04 PM   #5
corvette_stingray
Junior Member
Thread Starter
 
Member Since: Dec 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default Gentlemen thank you soo much for all the advise and Help

Really has been helping me out, Happy New Years to all Corvette Lovers...

The Corvette is still American's Sexy Car...

Thanks again.
corvette_stingray is offline   Reply With Quote
Old 12-29-2011, 05:15 PM   #6
Alan 71
CF Senior Member
 
Alan 71's Avatar
 
Member Since: Sep 2006
Location: Westminster Maryland
Posts: 23,882
Thanks: 0
Thanked 934 Times in 839 Posts
Default

Hi c_s,
The only thing I'll add is that I believe the a/c option limits the room available for the engine since the blower duct work is larger then a non-a/c car.
This didn't stop the factory installation of a bb in any way, and may not affect you in any way either.
Happy New Year!
Regards,
Alan
Alan 71 is online now   Reply With Quote
Old 12-29-2011, 05:24 PM   #7
DRIVESHAFT
CF Senior Member
 
DRIVESHAFT's Avatar
 
Member Since: Aug 2005
Location: League City TX
Posts: 1,680
Thanks: 0
Thanked 0 Times in 0 Posts
Default

FYI - Your block may have come out of a light duty truck, but its not what is considered a truck block.
Thats a good thing. Truck blocks are taller, heavier, and a general pain in the butt for no advantage unless your trying to build a major stroker.
DRIVESHAFT is offline   Reply With Quote
Old 12-29-2011, 05:28 PM   #8
RHD '68 L89
CF Senior Member
 
RHD '68 L89's Avatar
 
Member Since: May 2003
Location: Melbourne, Victoria, Australia, the World
Posts: 1,634
Thanks: 0
Thanked 1 Time in 1 Post
Default

3999289 block was used in Vettes so all the factory bits should just bolt up.
RHD '68 L89 is offline   Reply With Quote
Old 12-29-2011, 05:46 PM   #9
corvette_stingray
Junior Member
Thread Starter
 
Member Since: Dec 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default Thanks for the info, this is great news

Quote:
Originally Posted by DRIVESHAFT View Post
FYI - Your block may have come out of a light duty truck, but its not what is considered a truck block.
Thats a good thing. Truck blocks are taller, heavier, and a general pain in the butt for no advantage unless your trying to build a major stroker.
Thanks for the info, this is great news.
corvette_stingray is offline   Reply With Quote
Old 12-29-2011, 05:47 PM   #10
corvette_stingray
Junior Member
Thread Starter
 
Member Since: Dec 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default This is great news

Quote:
Originally Posted by RHD '68 L89 View Post
3999289 block was used in Vettes so all the factory bits should just bolt up.
Thanks for the info, this is very good to kown.
corvette_stingray is offline   Reply With Quote
Old 12-29-2011, 10:15 PM   #11
Ben Lurkin
CF Senior Member
St. Jude Donor '09
 
Ben Lurkin's Avatar
 
Member Since: Dec 2006
Location: Oquirrh Mountains
Posts: 2,867
Thanked 3 Times in 2 Posts
Default

You will need corvette specific pulleys and accessory brackets for your 454 as well as a short water pump. Somebody already mentioned the springs and rad. Add to this list a corvette specific oil pan and oil pump pickup tube. All these items will probably cost you $1200 or so.

GM never made the 454 in a tall-deck block; only the 427 and 366 md & hd truck engines came in that configuration.

I hope you are planning on rebuilding and doing some performance upgrades to that 454 before installation; otherwise you are going to be disappointed with it.

Last edited by Ben Lurkin; 12-29-2011 at 10:21 PM.
Ben Lurkin is offline   Reply With Quote
Old 12-29-2011, 10:44 PM   #12
scrappy76
CF Senior Member
 
scrappy76's Avatar
 
Member Since: Jan 2011
Location: Hamilton Virginia
Posts: 1,244
Thanks: 0
Thanked 18 Times in 17 Posts
Default

short water pump is a short water pump. There is not a corvette specific short water pump. I am also doing this swap and if you have patience in your search for the correct pulleys and brackets, it will cost less that $1,200. Also if you do some searching There are two others on here who have swapped in a light duty truck bb and used the same oil pan, but if you want the vette oil pan, I have seen a couple on ebay for a average of $50.
scrappy76 is offline   Reply With Quote
Old 12-29-2011, 11:47 PM   #13
Big Block Dave
CF Senior Member
 
Big Block Dave's Avatar
 
Member Since: Jun 2010
Location: Bellmore NY
Posts: 768
Thanked 8 Times in 8 Posts
Default

My waterpump speculation is from many years of reading catalogs while sitting on the toilet. If Im wrong, please forgive me, but please tell me why a manufacturer would make two of the same part for an additional application specified for Corvette, with a different part number?

http://www.tuffstuffperformance.com/...od/prd9010.htm

http://www.tuffstuffperformance.com/...od/prd8951.htm
Big Block Dave is offline   Reply With Quote
Old 12-30-2011, 04:12 AM   #14
HamadUP
CF Senior Member
St. Jude Donor '08
Support Corvetteforum!
 
HamadUP's Avatar
 
Member Since: Jan 2003
Location: Doha
Posts: 2,860
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Big Block Dave View Post
My waterpump speculation is from many years of reading catalogs while sitting on the toilet. If Im wrong, please forgive me, but please tell me why a manufacturer would make two of the same part for an additional application specified for Corvette, with a different part number?

http://www.tuffstuffperformance.com/...od/prd9010.htm

http://www.tuffstuffperformance.com/...od/prd8951.htm
simply because the corvette uses a different shaft diameter, I think it was 3/4 in. vs 5/8 in. for the passenger cars. If you want to retain the stock fan clutch then you need a corvette specific w/p with the larger shaft, so basically you could use any BB short w/p as long as you have the correct fan clutch.
HamadUP is offline   Reply With Quote
Old 12-30-2011, 09:50 PM   #15
scrappy76
CF Senior Member
 
scrappy76's Avatar
 
Member Since: Jan 2011
Location: Hamilton Virginia
Posts: 1,244
Thanks: 0
Thanked 18 Times in 17 Posts
Default

Quote:
Originally Posted by HamadUP View Post
simply because the corvette uses a different shaft diameter, I think it was 3/4 in. vs 5/8 in. for the passenger cars. If you want to retain the stock fan clutch then you need a corvette specific w/p with the larger shaft, so basically you could use any BB short w/p as long as you have the correct fan clutch.
If you go on each of the following auto parts stores : Napa , Advance , or Rock auto , They all offer replacement water pumps for the 1974 454 big block in either 5/8 or 3/4 shaft. In different brands too. I am sure if you go with the 3/4 shaft, it is stronger than the 5/8.
scrappy76 is offline   Reply With Quote
Old 12-31-2011, 01:46 PM   #16
hugie82
CF Senior Member
 
Member Since: Mar 2007
Location: Bridgewater nj
Posts: 3,553
Thanked 30 Times in 30 Posts
Default

I did a 74 with a 427bb and 4speed. Fit right in DrRebuild supplied all the brackets and mounts.
hugie82 is offline   Reply With Quote
Old 12-31-2011, 06:20 PM   #17
stingr4y
CF Senior Member
 
stingr4y's Avatar
 
Member Since: Mar 2005
Posts: 287
Thanks: 0
Thanked 0 Times in 0 Posts
Default

For what its worth, I too dropped in a 454 with the truck oil pan. I didn't know to worry about it. It fit fine.

I even ran with all the truck pulleys for a while, (had to re-wire for alternator). No A/c, no power steering though.
stingr4y is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • 71 - 74 Corvette 454 Engine compartment size
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    1974 corvette bbc pullys genep C3 General 3 07-14-2015 09:24 PM
    71 LS6? Motor question... 19Tyler74 C3 Tech/Performance 13 03-28-2012 11:08 PM
    454 starter question... babalu95 C3 Tech/Performance 5 08-12-2011 06:18 PM
    Any info on this motor I found? Fubba C3 Tech/Performance 7 03-21-2010 07:18 PM
    Gen VI, Gen IV parts interchange? 454_71Stingray C3 Tech/Performance 3 07-11-2007 09:52 AM


    Tags
    1974, 350, 454, 71, 74, ac, casting, compartment, comperment, corvett, corvette, corvettes, engine, swap, vette

    Thread Tools Search this Thread
    Search this Thread:

    Click for 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

    Forum Jump


    All times are GMT -4. The time now is 06:22 PM.