I don't know about the front 3100 manifold bolting up, but obviously the rear won't bolt up because it is gonna dump out the back where the downpipe connects on the N/A engines.  I ported my 3.1 manifolds to match the 3100 heads.  

The difference in compression ratio is in the pistons, the heads have the same size combustion chamber on them.  Your compression ratio will not change.  (unless of course you use thinner/thicker head gaskets and/or different pistons)

I used stock pushrods, but thats because I'm using '95 heads, meaning I don't have the roller fulcrum rockers.  If you're using roller fulcrum rockers then you will need custom length pushrods.  

It isn't that difficult, there is just a lot of crap you have to do.  I would rate it probably like a 7 or 8.  But just to help you realize, I was 16 when I did the swap, so obviously it doesn't require a rocket scientist.  I did the swap over about a 3 week time period when I had time, probably an average of about 2 hours a day.  I took my time on the swap, and did other things that you might not be doing at the same time. (the cam and a new passenger halfshaft because I snapped mine a couple days before i did the swap) Not to mention I spent about a week of that trying to find my damn oil leak because i didn't tighten down the turbo oil feed line all the way.  

And also, all 3X00's with roller fulcrum rockers had 1.6 rockers.  If they weren't roller rockers, then they were 1.5, if I understand correctly.

Shawn

Was there any more info discovered about the rockers?  I remembered all the 1.6's being only roller, now I have read on the 60deg board that some may not be.  And most people say they don't bolt up, but I've ridden in a TGP that had them.  And the owner said he just did a basic rocker swap, nothing special.

:?:

Quote from: dbtk2I used stock pushrods, but thats because I'm using '95 heads, meaning I don't have the roller fulcrum rockers.  If you're using roller fulcrum rockers then you will need custom length pushrods.

do you know the length of the pushrods needed? cause i'm gona use some rockers off of a 04 3400?

Quote from: Air TGPdo you know the length of the pushrods needed? cause i'm gona use some rockers off of a 04 3400?

I couldn't tell you.  But i know they can tell you on the 60degree board.  

QuoteWas there any more info discovered about the rockers? I remembered all the 1.6's being only roller, now I have read on the 60deg board that some may not be. And most people say they don't bolt up, but I've ridden in a TGP that had them. And the owner said he just did a basic rocker swap, nothing special.

Well, I can tell you that you can't bolt them up to your heads without cutting notches in your heads.  And I'm pretty sure you would still need custom length pushrods.  The regular 3100 rockers (that look like ours) were 1.5, and the roller fulcrum were 1.6.  I've heard one source say otherwise, but I believe what I've seen from personal experince and heard from dozens of people over that one source.  It seems a lot easier and a lot more practical to just buy some comp 1.6 roller tip rockers to me though.  Those will bolt right up with some guideplate modifying, so why not just spend $130 or so on those and modify your guideplates instead of trying to find custom length pushrods and all that.  I don't know what your friend with the TGP used for his swap, but I would talk to him about it, because as far as I know its not possible.  I have some 1.6 Roller Fulcrum rockers that came off the '97 3100 I used for my topend (except the heads) if you want to experiment with them or whatever.  I have the pushrods from that motor too, but I'm not sure the lengths are even close to being right for a 3.1...

I know I'm putting 1.6's on my STE, and I'm using comp rockers.  I have them sitting in the garage waiting to go on once I get the thing back on the road again.

Shawn

dbtk2......help me get this straight....ok so your using 1.5 rockers from an early 3100?? but some people want to use 1.6 roller fulcrum from later years 3100 and its alot of work???s what is the difference between those 1.6 roller fulcrums and regular comp cam or any aftermarket roller rockers??? which set up is the highest quality/best perfomance??
thanks in advance

Quote from: futuretgp'erdbtk2......help me get this straight....ok so your using 1.5 rockers from an early 3100?? but some people want to use 1.6 roller fulcrum from later years 3100 and its alot of work???s what is the difference between those 1.6 roller fulcrums and regular comp cam or any aftermarket roller rockers??? which set up is the highest quality/best perfomance??
thanks in advance

I'm using the 1.5 rockers off my 3.1, but they are the same as what came on the early 3100.  Since I have '95 3100 heads, I can use these rockers no problem.  The roller fulcrum rockers have a bolt and mounting plate attached to them, and the mounting plate has a slot in it that sits down in the slots in the later 3100 heads (the ones that the 1.6 rockers came on).  The 1.5 rockers just have a nut to hold them on to the studs/guideplates that are attached to the heads.  The 1.6 rockers will also required different length pushrods (as far as I can tell) then the 1.5's do on a 3.1.  

Now, the Comp Cams roller tip rockers don't have roller fulcrums, so they aren't as efficient, but that difference in power is gonna be small. (like 2hp MAYBE)  However, they are like $130 and the bolt right onto the stock heads and retain the stock pushrods, all you have to do is grind down your guideplates a little for clearance.  The Crane Roller Rockers will bolt right on as well, and they are roller fulcrum and roller tip (the 3100 rockers are only roller fulcrum, not roller tip), however they are almost $400, so it doesn't seem worth it IMO.  The aftermarket rockers were designed for the '80's 2.8L engine, so thats why they bolt up to the heads with little modification.  

Shawn

hey man thanks alot for being patient with me....i completely understand now!!

haha i have one last question though...did you have to use a different power steering pump?

Quote from: futuretgp'erhey man thanks alot for being patient with me....i completely understand now!!

haha i have one last question though...did you have to use a different power steering pump?

Yes.  I ended up getting one from a local salvage yard that only deals with ~'00 and newer cars, so it came off of a '03 Impala with a 3400 that had like 500 miles on it when it was wrecked.  It was $55 for the pump, and it came with a lifetime warranty as well.  Not a bad deal IMO.  

It isn't that hard to make it work either.  I didn't have to buy a new line or whatever, in fact I don't even remember having to do any bending to make it work.  The only thing I had to change was the rubber line that connects to the power steering pump, the nipple goes up instead of down, so I had to get a different rubber hose for that.  

Shawn

uhhg...more questions hope u dont mind...why did u use 95 head and not the 97 heads?  what did u do with the throttle body and vacuum lines?

Quote from: futuretgp'eruhhg...more questions hope u dont mind...why did u use 95 head and not the 97 heads?  what did u do with the throttle body and vacuum lines?

I used the '95 heads because I already had some lying around that had been completely rebuilt and had a valve job done, etc...  The heads off the '97 engine would've needed a rebuild before I would've felt comfortable putting them on the car.  Not only that, but flow wise, there is no difference between the two heads, so why not use the one I don't have to drill a hole in for the coolant sensor, and the one that I don't have to change pushrods with.  It just didn't make sense to me to use the '97 heads.  If they would've been '00+ heads, it would've been a different story, but since they were only '97 heads, the decision was quite easy.

I guess I don't understand what you're asking about the throttle body.  The plenum has plenty of vacuum ports.  I just connected vacuum lines to the closest port in the plenum.  You will probably end up having to block some of the vacuum ports off actually.  But, that is easy stuff that you will figure out just by looking at it.  Vacuum lines are simple...

Shawn

thanks again man.....u should do a write up and or make this top end swap info a sticky post