Installing Big block into C3
Burning Brakes
Joined: Apr 2003
Posts: 844
Likes: 0
From: Central KY
Re: Installing Big block into C3 (Torque Crazy)
I did this a few years ago with another car. You do have to remove the stock big block exhaust manifolds even though they hug tight and appear that they would drop right in with the motor... Heads can stay on... I also put the motor in alone, with the tranny (manual) and bellhousing already there waiting for the motor. Other folks put the whole package in as an assembly.
Team Owner
Joined: Feb 1999
Posts: 34,455
Likes: 665
From: Republic of Texas
Re: Installing Big block into C3 (joe73vette)
The thing you have to work with is there is no fuel pump boss on the 502's, only 454's. Joe
Team Owner
Joined: Feb 1999
Posts: 34,455
Likes: 665
From: Republic of Texas
Re: Installing Big block into C3 (ORVette)
My 454HO has a mechanical pump boss. I'm running a mechanical pump. Do yourself a favor though, go electric.
:cheers:
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Burning Brakes
Joined: Apr 2001
Posts: 752
Likes: 1
From: Springfield Oregon
Re: Installing Big block into C3 (Corey 68)
??? I don't know? Mine is actually a Gen. VI block. I think it was assembled in '98 if I remember right from the build tag. Anybody else know why the difference? :confused:
Team Owner
Joined: Feb 1999
Posts: 34,455
Likes: 665
From: Republic of Texas
Re: Installing Big block into C3 (BB73Chris)
ORVette which intake is that on there? It looks pretty low does it fit under your '73 hood? I assume it's for oval port heads is that right?
[Modified by Corey 68, 12:41 PM 5/28/2003]
Burning Brakes
Joined: Apr 2001
Posts: 752
Likes: 1
From: Springfield Oregon
Re: Installing Big block into C3 (Corey 68)
The intake I have is casting# 3963569. It is a 70-71 LS6 low rise, as far as I know. Corey is right, it is for rectangle port heads. I think you have a few more options with oval port intakes, but yes, this one fits under a stock '73 hood with a little room to spare. I think I paid $200 for it from another forum member.
