gen2 rr on gen3 heads?

[i8sum2]

not sure if my info is right gen2 rr are 3/8 to 10mm and and gen 3 are 3/8 to 8mm? what if u put gen 2 rocker studs in get 3 heads? will this work?

[bszopi]

Gen3 has 10mm studs as well, up to around 2004, when they switched over to the 8mm studs. So yes, Gen2 studs work in a lot of Gen3 heads.

[WrathOfSocrus]

not sure if my info is right gen2

Your info isn't right. Gen 2 (FWD round exhaust port aluminum head) studs are 10mm top and bottom. I just tried to fit them inside a 3/8 full roller rocker and they do not fit in the 3/8 hole (10mm is slightly larger than 3/8 ). Also, those studs use a net lash system and are not adjustable. I have heard using Gen 1 studs does work but I personally have not seen them to confirm if the top part of the stud is actually 3/8 or not. Perhaps someone with Gen 1 experience can provide some help.

[bszopi]

Stock studs are all metric, but aftermarket studs to use with aftermarket rockers (such as the Crane Gold Race rockers) at metric on one side and standard on the other. So I guess it depends on how you interpret his question...

[WrathOfSocrus]

Yes, I have still yet to make sense of the meaning of rr. It might be more helpful if we know exactly what is intended to be placed on the studs in order to give a better answer.

EDIT - none of the STOCK studs that I know of are standard on top which is where the confusion lays. Much more info is needed.

[i8sum2]

i thought the threads into the head for the Roller Rocker studs are 3/8's on 1 end and come to a 10mm stud where you mount the RR

[WrathOfSocrus]

OK that's where the confusion was. Full roller rockers never came on a 60 degree and the Gen 2 heads never came with roller fulcrums. The aftermarket studs for aftermarket roller rockers come in both 8mm and 10mm bottoms with 3/8" tops. As previously stated the heads changed to 8mm around 2004.

Your usage of Gen 2 and Gen 3 are confusing. Perhaps some background info like the make, model, and year of the car being used and any info regarding what engines/heads/intakes you are trying to use will help clear the confusion.

[i8sum2]

just trying to see if f body 3.4 rwd iron head studs will fit 01 grand am heads

[WrathOfSocrus]

RWD iron heads are Gen 1. What roller rockers are you referring to? Yes the studs should fit but the stamped rockers that came with the iron head are likely worse than the roller fulcrums that come standard on an aluminum 3X00 head. If you are using 3/8 roller rockers you need aftermarket studs that are 3/8 on top and 10mm on bottom.

If you have the Comp Cams roller tip rockers already installed on the iron heads they should switch over to the aluminum heads without a problem. Any full roller rockers will need the aftermarket studs, the iron head studs probably wont fit inside the 3/8 hole.

[96ols60degree]

if you are referring to the comp cam roller tip 1.6 rockers,designed for 2.8 iron head,i put these on my 96 3100 using the rocker studs off a 2.8 mpi because with my 3100 studs,they would not tighten down.the 2.8 mpi studs provided either more thread,or shorter stud,i do not remember.

[NArtissimus]

Hey,
this is propably the thread I'm looking for. I have a 95 3.4RWD with the stock heads and i have a set of heads from a 2000 3400. Do the roller fulcrum rockers transfer over to the 3.4? and If I buy a set of 1.6 roller tips meant for the 3.4 will they transfer to the 3x00 series aluminum heads later when I do my swap, or are the 3x00 rockers a 1.6 already. Where's the bigger advantage, in the tip or the fulcrum? I just don't want to put much money into this motor that isn't going to be any good later on.
Thanks alot

[WrathOfSocrus]

The roller fulcrum rockers from the 3400 will not fit on the 3.4 iron heads. They have tabs on the bottom that only fit into Gen3 heads that came with the appropriate slots to mount them. From what people say the roller tips don't roll at high rpm but slide across the valve stem. While they probably provide more accurate rocker ratio the roller tips don't really free up much in the way of friction or horsepower. The real HP increase would come from the 1.6 ratio as opposed to the stock 1.5.

The 3400 roller fulcrums are 1.6 ratio. While you can get the roller tip replacements for the iron heads they would be of little use to the 3400 heads. They would bolt on with the proper studs but would not be a real improvement over stock. If you are going to invest money into roller rockers there are a couple options.

Full rollers are the way to go. The crane gold race can be had in the neighborhood of $370 I believe. Scorpion also has some nice rockers. I know everyone is waiting on the larger ratios but there is nothing wrong with a set of narrow body 1.6 rockers. I got a set for the center bolt Chevy style, 16 rockers for a bit over $200 shipped. I used to see the rocker studs for around $50 but lately I can only find them sold in pairs for $13 ( or $78 for the 12 needed).

That puts a set of full rollers around $300 after shipping. Those rockers would be able to be used on any 60 degree motor which means they can easily be moved onto your new setup as you upgrade things under the hood

[NArtissimus]

Ok, I know the slots you are talking about. I saw them when I took the rockers off of the 3400 heads to clean everything up, and as far as I understand, and can see, is that they are non adjustable so just crank them back down. See the reson I'm asking about the rollertips is because I've seen two guys now selling the CompCams 1.6 roller tip rockers and I'm wondering if its' worth the money. I've never seen full rollers for these motors before so I didn't knwo they even existed. And again I'm assuming that the 2.8/3.1 ones will fit onto my 3.4 heads just fine.
Thanks

[WrathOfSocrus]

Yes the roller tips from the 2.8/3.1 will fit the 3.4. The 1.6 roller tips are an upgrade to the stock 1.5 rockers and half the cost of the full rollers. However if you do intend on changing to Gen3 heads in the near future then they aren't really an upgrade to the rockers already on those heads. The full rollers do cost more but have the advantage that they can be used on any 60V6 head. You will have to get Gen2 pushrod guides to put on the Gen3 heads and get hardened pushrods for the application.

If you are using the 3.4 block with Gen3 heads and don't change you cam you might be able to just use the stock replacement pushrods with the full rollers. If you change cams then you will need custom length pushrods, and remember to get the hardened type.