My poor 95' Grand Prix

[Russell52]

Yes, you have the notches. Look in the 1st picture, and you will notice the grooves machined out of the heads where the rocker stud goes. It would be advantageous of you to try and find a set of roller rockers and just bolt them in. I have heard of people clearancing the LIM for the stamped rockers and grinding through the runner. Then your LIM is trashed. I'm sure someone around here has a set of rockers they'd be willing to get rid of.

I was concerned that I should keep the original rockers/push rods,because of the wear patterns,I guess I could get the push rods,and rockers from the 3400 that I am gonna rip parts off of.. So if I get the roller rockers,I dont have to worry about the grinding,I guess that would be easier to do than to grind,trial and error clearance.. I am still not clear which LIM gasket to use,Mine is plastic/rubber and is a 1/8th inch thick...

I'm going into all of this assuming that reliability will still be the same as stock??:P

So far looks like things I need are

3400 intake and plenum also egr adapter from the store..

roller rockers,and I should be ready to bolt back up.. after the heads are worked.. Figure what gasket I need..

Have any of you guys done this mod yourselves and did it give you a noticable power increase/torque??

Thanks guys

Russ

[3100 MPFI]

the lower intake gasket set you want to get will have the METAL INSERTS so that it does not get crushed. I don't know if felpro sells them yet. Here are pics of mine, and you can see that they are BLACK and have 2 metal inserts on each side of the bolt holes.

I got mine from GM.





And here you can see a stock ROLLER ROCKER:

[Russell52]

Thanks for the pics 3100,Do those roller rockers come stock in the 3400's ??

[IsaacHayes]

Yes. I'm not sure what year but didn't something change on the bolts for them or am I thinking something else?

You could grab the 3400 heads if you wanted and you'd have all the stuff plus the intake valves are slightly bigger. If you do that use the LIM gasket set for the 3400.

If using your 3100 heads then you need the LIM for your heads.

Felpro has even better. ALL METAL LIM gaskets:


You can't crush/crack/etc these suckers!

MS98004T is what you need (93-99 3100). (also get a upper gasket for a 3400 for the plenum)

[Russell52]

I am taking my heads to the machine shop wens day.. I wonder if they could increase the size of the valves,Guess I will place a call tomorrow.. I appreciate the replies so far.. Seems like a good community here,I hope my end result will be worth it

Isac,do you know for sure if the 3400 has roller rockers? I intend to goto the U pull it,saturday,and get the parts I need,so I need to get a list together Hmmmm anticipation

Thanks
Russ

[3100 MPFI]

whenever I bought my gaskets, felpro still had the solid plastic gaskets that crushed. The thing I don't like about the ALL METAL gaskets is that they transfer heat.

Getting the GM gaskets helps keep the upper and lower intake manifold cooler.

I want to say it was 2004 (but I am not sure about that) GM did change the roller rockers. The ones that you need will have a 10 mm bolt, but the newer ones are SMALLER (8mm).

I have a friend that had to replace on in his Malibu, and went to the dealer, but they gave him the smaller one.

If you get a complete set of 3400 heads, and it has the smaller bolts for the rockers, then you will have to swap heads out.

I want to say that the 2001 3100 heads also have the larger intake ports. I know the ones I have on my Cutlass are the larger ports.

[3100 MPFI]

yes, the 3400 heads have roller rockers. The 3400 came out in 1996, and that was the year that the 3100 was given roller rockers as well.

All 3400's will have them. The only thing is, if you get too new of a 3400, then it will have the smaller bolts that will not work in your engine.

If you are going for heads, then look for 3400, or 2001+ 3100.

Upper and lower intake, you can use any year 3400, or late 2001+ 3100 (the late 1999 3100 will have the large ports, but the 2001 newer is easier to get an EGR adapter for).

If you are just looking for the roller rockers, then you can get them from any 1996-2002 3100 SFI, or 3400 SFI.

[IsaacHayes]

Of course the 3400 all have roller rockers. They have the large lower intake manifold remember? If they had non-roller then the factory would have to get out the die grinder and grind the intake manifold! lol

If you use a 96-98 3400 LIM it will be tapped for your coolant pipe. Other wise you'll have to tap it.

And yeah large port 3100's had the 3400 heads with larger vavles too.

[Russell52]

Thanks for the replies I will be out at the junk yard Saturday,granted I don't get a million calls,I am on call this weekend Bad timing............

Russ

[Russell52]

Well guys,went to my local junk yards yesterday, at least the u pull its,and they had nothing in the way of a 3400 And its getting close to time to reassemble,Yesterday was a big disappointment,and it rained on me while I was out there as well,lol ruin my parade....

Anyways, are there any other options,that I might consider before I goto reassemble??? I intend to clean all my surfaces today,and paint... All I can say right now is damn...

I hope the store can at least get me a chip..


Russ

[IsaacHayes]

What about 2000+ 3100's? Those are large port. http://www.car-part.com is where I went to get my stuff shipped to me. I got a 97 venture van LIM (already tapped for my coolant pipe) and my UIM I wanted from 2 different places. Also post a WTB or check the B/S/T section someone might have them for sale.

Example http://60degreev6.com/showthread.php?t=36773 LIM for sale.

[Russell52]

ok came across a 99 3400,although it has the smaller bolts on the rocker arms,and has a small egr valve,has a oval shaped opening on it,know what I mean? Is there a adapter for that egr,and would that LIM,and plenum work??

Thanks
Russ

[IsaacHayes]

Yeah those intakes will work, you still gotta swap your rockers or grind the LIM of course, and you'll have to tap the LIM for your coolant pipe fitting.

This is the adapter you need for EGR:

http://www.60degreev6.com/store/index.php?act=viewProd&productId=9

So the 1999 3400 roller rockers won't bolt to your heads? I thought it was later years then that when they changed the bolt size..

[Russell52]

Ok,heres the deal,got to looking at my heads tonight,the ones I got back from the machine shop yesterday,and the intake ports on one head are 1/4 or so bigger than the ones on the other head,It looks like he gave me one of my original heads back,and messed up removing the bolts where I had broke some off,and gave me a 3400 head in place of my original,I know he had a set already worked cause I had asked him about the 3400..So I am going to try and get another 3400 head from him tomorrow,as I don't believe the 3100 intake will work in there with miss matched heads,also I fear that 2 different heads would make it run funny..The 3100 intake gasket also doesn't fit the other head very well either..

Like i said on that 3400 I found ,it has a 1 1/2 inch oval pattern on it,and the egr actually faces the firewall,So it doesn't look like that adapter in the store will work for it,as the other 3400 I saw,had a different egr position,but it would point to the hood,and looked like the adapter would work on it,to bad someone too a hammer to the plenum and destroyed it..

I gotta do something and fairly quickly I suppose,I was going to have it running this weekend I had though,things look different now though :P

Russ

[Russell52]

Found the adapter I would need http://www.60degreev6.com/store/inde...d&productId=75