what's the diffrence in v8's?

[secretagent]

What's thie diffrence in small block chev v8 that have the center bolt valve cover and that don't, other than the obvious center bolt. and what years did they change to that. i just bought an edlebrock efi unit but it says for 1987 and older, i have a v8 with center bolt covers and wonder if the thing is going to work or am i going to have to change other things.

 

[dustin]

What's thie diffrence in small block chev v8 that have the center bolt valve cover and that don't, other than the obvious center bolt. and what years did they change to that. i just bought an edlebrock efi unit but it says for 1987 and older, i have a v8 with center bolt covers and wonder if the thing is going to work or am i going to have to change other things.

Vortec vs non vortec heads? I thought that they (atleast wtih the V6 motors) kinda moved the bolts around to make the ports bigger/ breath easier?

-Dustin

 

[orangefj45]

gm started using the center bolt style in 87 i believe, when they did away with carbe completely.
you can still use the efi setup, but i think you'll have to run earlier heads. different angle from what i remember. i'd calll edelbrock. good tech department.

 

[Cdaniel]

I'm not sure, but I don't think center bolt equals vortec. But vortecs do have center bolt covers and different intakes due to the head design. I have a 350 crate eng with center bolt covers in my 62 Chevy Truck. I've got a regular old Edelbrock performer and Q-jet induction on top. It does have a 1 piece rear main seal though. Earlier 350s are two piece.

 

[HI^C]

hold,

vortec V8 started in 97, three hump castings. Vortec V6 started much earlier, and are available in mpi and Tbi.

back to V8
Tbi setups can go on any sbc with a 4barrel to tbi adapter like $25 or so.
intake manifold bolts do change angle.

87 is the first yr for center bolt hole covers, in trucks.

 

[Rock_Hugger]

The difference in the center bolt vs. the old style heads is the 2 center bolts that hold the intake to the heads is at a different angle. You can modify the 2 center bolt holes on the intake to work on the eariler heads. Edelbrock even has a tool to do a cleaner job. Not a big deal, I've seen it done many times.


This is on pre-Vortex head's 97ish.

 

[Rock_Hugger]

for Small-Block Chevy Intake Manifolds


This handy tool is for the amateur as well as the professional engine assembler allowing for simple elongation of the intake manifold hold-down bolt holes. ItÕs for use on intake manifolds in which the engines have had either the heads or the deck surfaces milled and the stock location manifold bolt holes are mis-aligned. This steel tool can be used in the shop or at the track. With only three parts, this tool is very easy to use with detailed, step-by-step instructions and a user-supplied drill motor and 7/16" drill bit.

Manifold Bolt Hole Slotting Tool ....#8501

 

[secretagent]

rockhugger, thanks for the info. where can i buy one of the 'dohickies'?

 

[dustin]

to be a smart ass (you can teach a man to fish... ): just copy this" Manifold Bolt Hole Slotting Tool ....#8501" into Google.

 

[Rock_Hugger]

to be a smart ass (you can teach a man to fish... ): just copy this" Manifold Bolt Hole Slotting Tool ....#8501" into Google.

Or you can read my first post, it says who makes it


I'll give you a hint............................................ Edelbrock

try here

 

[secretagent]

I f---ked up and didn't see it. Thanks again........of ya

 

[Bennett]

http://www.edelbrock.com/automotive/index.html

$67

woops.. go to intake/ manifold GM/ performance tools

or

http://www.google.com/search?hl=en&q=Manifold+Bolt+Hole+Slotting+Tool+8501&btnG=Google+Search

 

[zebrabeefj40]

If you don't wanna spend the coin on a fancy tool you can use a round file or a burr in a Dremel tool to open the holes up. This worked for me....

The engine builder I used to work for would do this modification on his milling machine for $50. You might check around...



Nick Jennings