3500 Part numbers. MORE INFO ADDED.

[v6h.o.]

took a look through the Parts Computer here at work tonight. (night shifts suck)

Part numbers:

12576694 CYL Head. Specific to 04-05 3500.
12568411 Intake Valve.
12568412 Exhaust Valve.

12567117 camshaft.

Crossrefrencing the Part numbers on GM's Parts catalog, the Camshaft part number it brings up 03-05 3100/3400/ and 3500 engine's/Platforms.
so its odd that they say its a specific camshaft lobe lift/duration change. ????

However! the Valve part numbers crossrefrencing them to see what and all applications they fit only comes up with 04-05 "Zcar" LX9 (Z platform is the new Malibu/malibumaxx)
now what this means as per the valves?.. not sure..
either:
A) larger valves?

B) different construction material of valves.

more info to mull over...

[bszopi]

Hmm... well, let's see what I can find out. I'm sending him some club decals, so perhaps he'll give up some more info. Probably not, but you never know... Lol!

[patgizz]

wonder if the exhaust manifolds would bolt to my 3400, at $62 for the pair from gmpd, it might be a decent experiment

[bszopi]

I'm wondering if the 3500 heads are the same as the 3900. I've yet to see pics of the 3500 heads, but by looking at the 3900 heads, there are significant differences between the pervious heads. And one of the differences is in fact the exhaust bolting positions.

Here is a HI-RES pic of the top side of the 3900 heads...

http://60degreev6.com/3900/Cylinder%20Head%20-%20Top%20View%20-%20Exhaust%20Side.jpg

[bbeck]

The 3900 will share none or very little with the 3500 as the cylinder bores are spread out to accomodate such a big bore. at least, that's what I've read about it.

[RacerX11]

The cylinder bores are not spread out, they are just shifted further out from the lifter valley. They were running into clearance problems with the lifter area and camshaft, not the adjacent cylinders.

Marty

[bbeck]

oh, my bad, must be I misunderstood the material. does anyone know if these exhaust manifolds will bolt on my 2.8? if not, what is the issue?

[RacerX11]

What 2.8 do you have? It will depend on whether or not the 3500 uses the same bolt pattern for the exhaust manifold as the 3900.

Marty

[bbeck]

it's in my 88 beretta. I wanna get a set of the exhaust manifolds from the 3500, since I have my exhaust off right now and the tranny out, it would be easy to get them in, and do I need the oilpan from the 3500 also?

[TheProfessor]

interesting question

[GPXSS]

is it just me or do the exhaust ports look shorter, but fatter?

Also, if they move the bore centerline away from the valley... wouldnt that mess with the V pattern (if they keep i perpendicular)

[v6h.o.]

i thought it was they raised the camshaft higher to alow for the wider cylinder bores as per making the whole cylinder wider from the same central bore centerline. so this would mean the bore protrudes wider into the valley which is why the raised camshaft and protrudes further on the outside of the block... wouldnt it???
or am i also wrong on this?

[RacerX11]

I guess we won't know until someone takes one apart and measures it

To answer your question Chris, it wouldn't change the angle of the V if they didn't change the angle at which the cylinders were in relation to the block. Just think of the block deck surface, now slide the cylinder bores down away from the valley. The cylinders would still be at the same angle with respect to the other bank, but the cylinders would no longer be on the centerline of the cranksaft. This is not a bad thing, it is very similar to having the offset wrist pins in the pistons. They might move the cylinder bores for block clearance, then reduce (or eliminate) the wrist pin offset to retain the same geometry as today.

Also, the one pic of the intake ports looks like they are more V-shaped than the current ones.

Marty

[SappySE107]

I havent seen the 3500 head pics, but the 3900 heads have a larger V to the intake port, and the exhaust ports are no longer angled, and do appear to be a bit wider. I have no idea if the 3500 heads are the same though, and sorta doubt it considering the bore difference.

[v6h.o.]

well i recieved my 3500 Plenum today...

it is a full on open plenum with no actual "runners" as per how the 3100/3400 are.

there is a divider wall from the throttle body opening that divides off on each side only the length to where the # 6 and #5 ports are.

the throttle body flange is different its a 4bolt hole setup. with 2 of them having studs coming off it. Niether my quad 4 throttle body OR the stock 3100/3400 throttle body bolt holes line up at all. looks like some modification needs to be done here.
all bolt holes for the throttle body are a M6 bolt size now instead of the M8 we are used to.
the throttle body opening is a whopping 66mm diameter.

my plenum came with a new Map sensor mounted onto it as well. i'll be taking Pics tonight so dont get your panties in a bunch... pics will be posted.

then i'll get in there with the die grinder and the porting tools to smooth it up and massage it a bit more.
then of course im going to have to polish the bitch to make it look as purdy as my 3400 plenum.