building destroked 3400

[bjornmk1]

it's an 3400 block,I'm sure.

it has an A on it.
bore is 92mm.

I got it without the upper plenum though,but i bought the upper part on ebay
for 12$ LOL.

bjorn

[bjornmk1]

unfortunately the crank deal was not going to happen.

I bought a crank from stan mizell engine builders in florida in 10-10 grind.
still the bearings will be from clevite.

It would be better to work with a standard size crank
for the strength of the bearings...but that's just the way it is.

maybe I will look into oilsquirters for nr.5 and 6 pistons
to get some extra cooling for those.

got the upper plenum and it looks like there is a kind of restriction
on the throttlepart.
I will probably make a new neck from some 2,5-3 inch alu tube
and have it welded by a guy at my work.

that's it for now..I'll keep you posted guys.

[IsaacHayes]

What year 3400 upper plenum? 00+ have a bit better neck on them.

[Lilchief]

IsaacHayes: Have you thought about using 6.2 rods instead of the 5.7 ? I got 6" H beams in my 3.4 so 6.2 should fit as long as the big end is right and if you was to use ross pistons you'd have wrist pin oilers, might have the same affect as oil squirters. Just thought I'd make some suggestions.

[bjornmk1]

no idea what year that plenum is.
butt I'm gonna modify it anyway cause
the throttle is mounted on the intake of the sc.
only thing i need to do is make a new neck on that plenum
for my rubber hose to fit on.

btw.lilchief I am using forged cosworth pistons and they also have a sort of
pin oilers since they are not the pressed pinn type.

butt the differance in oilsquirters and pin oilers is that a squirter is
provide oil almost all the time (100%)during the stroke and a pin oiler only when the piston is going down(50%).

thanx for your thoughts guys

[IsaacHayes]

lilcheif, Heh, not me, I'm not the starter of the thread!

bjorn: the 2000+ plenums the egr mounts on a small square mount vertically. The older ones it's got a flat horizontal mount. Do post pics of the mods as you go!

[bjornmk1]

I will for sure.

than it's a old type plenum.
but I won't use the egr.

[Lilchief]

Sorry IsaacHayes, my bad. Question was for bjormnk1

[bjornmk1]

intake plenum

hey guys,

got my UIM gasket matched today.

here are some pics,before and after matching:

the marked area is where the neck would be welded "probably"

[IsaacHayes]

Cool! Be careful with those wheels on the gasket surfaces, I think you went over it to clean it with one? They can leave un-even surfaces and scratch the surface. The plenum should be ok but I'd be carefull if using them on heads/LIM. The LIM I got from the junkyard shipped to me they used one and it had some deep scratches. I sanded it smooth but not sure if the surface is uneven.

For cleaning the gasket surfaces I use brake cleaner and paper towels. Takes longer but doesn't harm the surface.

Did you ever look into the 3500 plenum? It's 65mm opening stock. But of course isn't near as cheap as your $12 one

Keep the pics coming, you're going to have one unique setup!!

[bjornmk1]

no bud,

I used a flat block of wood with some 360 grit paper wrapped around
to get rid of those sharp edges after grinding with the dremel.
I am sure the surface is flat and will not leak.

and for that 3500 plenum...eh..would be almost impossible to find
overhere in europe.

this one will have a 65-or 70 mm neck after I am finished with it.

now have to do the same for the lower manifold and the intakes of my heads.
I think I'll beadblast my heads intakes to prevent having drops of
fuel sticking to the heads intake.

I'll keep you guys informed.

[IsaacHayes]

Ah ok good. Hard to tell by pictures they don't show 3D. For de-burring after porting I took a flat razor blade and went around on the inside edge of mine and it took all of that off. Just a 45* angle going around the inside is enough to cut off the burs. I figured getting the 3500 plenum would be hard over there. Can't wait to see the new neck. BTW are you going polish the combustion chambers?

[bjornmk1]

headers for my build

found some headers from a 3L-24valve v6 engine.
these should fit with some work done to them.

I plan on making an adapterflange that will bolt to the head.
then after i mod the headers(for the spacing between cylinders) i will drill new holes in the adapterflange to mount the modded header on the adapter flange.

we'll see how this will work out

these only put me back about a 120$...so thats not the world

[IsaacHayes]

Haha cool! Shorty headers are better than stock manifolds! It will be interesting to see how you can mod them. Are they cast iron?

[bjornmk1]

no they are tubular of course

if they were cast manifolds I wouldn't be able to mod./weld them.

I'll keep you posted.