Pulling the plenum / IH Some pics !!

[5ABI VT]

Here's a few of various plenum/IH .

Can see some machining and a stop line here assuming this Might be from the 93-5 program?


Plenum

[5ABI VT]

Perhaps I confused myself when reading up on primary /secondary sizes etc thinking that they were those sizes from the plenum down to the head? I still find it odd that they are large at the head on the IH/cyl head. Can't be a bad thing I guess once opened up.

Plenum measurements :



Injector housing top

[5ABI VT]

Injector housings bottom /cylinder head side


And the head.

Primary

Secondary

[5ABI VT]

Originally Posted by A26B

Injector Housing; Cylinder Head side
Primary = 32mm
Secondary = 36.5mm

I must have missed this. I feel better now. Isn't it odd that the runners would start small and open up at the head or is it designed that way for air speed/swirl or all that fancy stuff ?

[LGAFF]

Those are stock

[5ABI VT]

Originally Posted by LGAFF

Those are stock

Really happy to hear it! Lack of knowledge on my end that the sizes varied at different points.

The cylinder heads however.. Have definitely been altered. Just got some better photos now of the drivers side. Relieved that the work had been done on both heads so they're equal. I'm
Not sure why someone would do head work and not have done the plenum/IH. My only guess is at some point before sale possibly the ported versions were removed for a set of stockers.

I don't know if the factory heads have any casting material around the valves? Or valve guides (not sure of the exact term) but if there was it's completely removed on all runners. Just the metal of the guide and valve are coming into the runner and it looks like most of the material around the back of the valve has been worked on. How much I don't know. Hopefully it had a positive impact and will only help when the top end is ported. She does run strong now and it's good to know I'll be picking up some ponies after all

[5ABI VT]

Here's a primary on the drivers side..

Shot down at that valve in the runner

Down the secondary .. Ugh .. Good riddance that this won't happen in the future. Unless I idle a lot !

Another primary

[LGAFF]

Those are ported....I would measure them with a telescoping gauge....a lot of the older porting is just cleanup....


http://www.harborfreight.com/6-piece...-set-5649.html

[Jagdpanzer]

From what I can see in the photos the head, injector housings and plenum ports appear to be the same as when they left the factory. I have a untouched set off a 94 motor setting on the bench and they look the same as yours. What you are seeing in the head ports is the minor machine work they performed to help reach the 405 hp rating on the later 93-95 motors.

[5ABI VT]

Originally Posted by Jagdpanzer

From what I can see in the photos the head, injector housings and plenum ports appear to be the same as when they left the factory. I have a untouched set off a 94 motor setting on the bench and they look the same as yours. What you are seeing in the head ports is the minor machine work they performed to help reach the 405 hp rating on the later 93-95 motors.

i can see that the machining at the top of the head being from the factory as its machined quite nicely and evenly. Further down however it looks to me like someone used a porting tool and was doing some clean up. Thats what it looks like to me anyways. Ive searched for hours to find some photos of a factory head/runner to compare and no such luck.