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LZ4/Fiero Swap

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  • Guest
    Guest replied
    Anymore update to this? I re-read the thread since you started off by mentioning the use of VVT and MS3X, I had hoped you got somewhere with that. :/ oh well.

    Also if you still need a cam bolt (gen3 type) I found that I have an abundance of them for some reason, I can send you one.

    Leave a comment:


  • neophile_17
    replied
    So I thought I'd share my experience with gmpartsgiant.com so that just maybe it will save someone a little hassle.

    I need a cam bolt since the LZ4 attaches the cam sprocket to the cam with 3 smaller bolts instead of one big bolt like the earlier motors. I looked up the part number for the bolt and picked the cheapest source which was gmpartsgiant.com. The part I got was nowhere near the right size so I checked that I had the right number and begun the process of trying to correct the issue. Their system is pretty obnoxious but eventually I had an email that they were sending the right part. What I got was the same incorrect part. At this point I'd rather get one from the JY or buy from another source than try to correct it with them.

    Also the first round of intake sanding should be tonight.

    Leave a comment:


  • neophile_17
    replied
    Valvecovers.jpg

    Not a huge update but I am getting somewhere as parts start to trickle in. It always bugged me that GM sent out valve covers with different textures. This time I found an easy way to hide this- wrinkle finish. I'm pretty happy with how they came out.

    I'm thinking about a brushed or even polished finish for the manifold. We'll see how fast sanding gets old.

    Leave a comment:


  • Guest
    Guest replied
    happy to see this swap moving forward

    Leave a comment:


  • neophile_17
    replied
    It's been awhile and this motor hasn't seen much activity but now that my LeMons season is over and the craziness of summer has subsided I'm ready to get back to it. There's been one important change since my last post. Thanks to bigcheese I have a set of cam spacers that will allow me to use a non-VVT cam. Eliminating VVT from the equation will make initial setup of the MS3 easier. I may go back and explore that further once everything is up and running and all the other variables are pinned down. For now I'm going to get it together with the stock 3500 cam I have laying around and build a MS3. So this will end up being more of a budget proof of concept build.

    So the next step is swapping out the cam. I'd like to go with SBC cam bearings (slightly wider) if possible but I'm concerned that the spacers will place the oil feed holes in the wrong spot. Has anyone done this with spacers? If that's a no go what is everyone's favorite 3400 cam bearing manufacturer? The GM stuff is over $100 and more than I want to spend if there's a quality alternative. Thanks!

    Leave a comment:


  • neophile_17
    replied
    Many thanks to Eric for posting those pictures!

    So I did an initial round of cleaning after pulling the valves on one of the cylinder heads. The intake ports are huge but the exhaust not so much. Has anyone put these on a flow bench? I'm imagining the exhaust is a little weaker than ideal. I may try a little porting to remove some of the shelf around the valve stem. Below are pictures of the port:

    Exhaust_Port_1.jpgExhaust_Port_2.jpg

    Any opinions on a valvespring upgrade? This motor will be going into an endurance car so it'll be seeing extended RPM but not huge lift. I'm partially tempted to see if the stock springs are up to it but I've got it apart... Anyone have good or bad things to say about spring buckets?

    Leave a comment:


  • caffeine
    replied
    I would definitely be interested in such a cam

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  • Guest
    Guest replied
    Originally posted by The_Raven View Post
    I think the plan for the cam sounds good, and I prefer the 3 bolt pattern over the single bolt. I'm just not a fan of the double roller timing sets that have been available. It seems that the gen3 chains are better for less stretch than the gen1/2 chains, but there's no compatible cam gear to mix and match the two AFAIK.
    The cloyes double roller are proven to be excellent quality

    the TCE double rollers required crank and timing cover clearance work to fit. I highly doubt you'll fit the cloyes unit without at least a gen 1 timing cover
    Not my problem. you can't satisfy everyone. However, I am sure the inside of the fwd housing can be machined or a dremel taken to it if the cloyes is too thick. Not only that but the 3 bolt cam might have been positioned a smidge closer to the block from the factory vs the gen 3. So its possible no modification to a fwd cover would be necessary. I am sure someone here has used a Cloyes double roller on a gen 2 cavalier motor before. chime in if so.

    I know it's speculation at this point but any idea what the earliest timeline would be for the new cam blank?
    I hope to have something to share within 2-3 weeks. Its not up to me though.

    Leave a comment:


  • ericjon262
    replied
    Phaser pics.





























    Leave a comment:


  • ericjon262
    replied
    PM sent

    Leave a comment:


  • neophile_17
    replied
    So I put the phaser back together yesterday. I keep getting errors about a token expiring when trying to post and uploading one photo at a time is tedious. I can email photos if interested.

    I know it's speculation at this point but any idea what the earliest timeline would be for the new cam blank?

    Sam

    Leave a comment:


  • ericjon262
    replied
    the TCE double rollers required crank and timing cover clearance work to fit. I highly doubt you'll fit the cloyes unit without at least a gen 1 timing cover

    Leave a comment:


  • Guest
    Guest replied
    I think the plan for the cam sounds good, and I prefer the 3 bolt pattern over the single bolt. I'm just not a fan of the double roller timing sets that have been available. It seems that the gen3 chains are better for less stretch than the gen1/2 chains, but there's no compatible cam gear to mix and match the two AFAIK.

    Leave a comment:


  • neophile_17
    replied
    Nate- That's an interesting combination you've got going. Hopefully you get back to it soon. Is the vette computer capable of operating a cable driven TB? Also I noticed that the hole in the block behind the oil filter adapter isn't tapped. Is your setup complete enough that you can tell if the stock filter and adapter will fit the subframe?

    Ericjon- With regards to VVT, I'm only planning a 1D table for VVT Angle at RPM. A 2D table may get me better fuel economy but it's not economical compared to the cost of dyno time. I'll make an educated guess, follow it up with street tuning, and dyno tune it for power.

    Leave a comment:


  • Guest
    Guest replied
    Originally posted by caffeine View Post
    The gen III timing cover *looks* like it could fit on a gen IV, assuming there wasn't a cam actuator in the way. The water crossover would probably have to be custom to fit with a FWD gen III timing cover.
    The plan is to have the obd 1 3 bolt pattern in the front of the cam, that way the cloyes double roller can be used in RWD setups if wanted. I think the double roller will fit behind the fwd timing cover with some grinding on the inside of the cover. if not then obviously a standard single chain can be used.

    Also the plan is to have the cam machined with the obd 2 timing ring so to speak on the cam so the obd 2 cam sensor can be used for those in later model cars. The cam sensor is secondary pending cost as I find most people doing 3400 swaps and lx9 swaps are using the 7730 hardware.

    with no cam acutator vvt, the rwd timing cover will bolt to the lz4/9.

    Leave a comment:

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