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  1. #1
    LS1 POWERED 2AVOID's Avatar
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    Default LS1 cam swap . What now ??

    Hey guys , I recently bought a cam for my ls1 . It's a Comp Cam xr285hr-12 or a 228/230 cam . I need some advice on what other bits I'll need to fit this to my motor ( VT motor ) . I've so far been told to get some Pac 1518 valve springs and 7.400 pushrods as they have the right preload for the lifters . Should I replace the lifters , timing chain and oil pump and if so should I use genuine parts or upgrade to performance parts . Would like 350hp atw anything over is a bonus . Is this achievable with just a cam change ?

  2. #2
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    Yeh u need to do valve springs and I'd do pushrods aswell. Don't really need to do lifters unless u want too, it's alot more work, heads have to come off. Oil pump will do the job, if ur motor has a fair few k's on it probably safe to do the timing chain.
    If urs is a vt ls1 it will have the smaller intake manifold and injectors so could try get a manifold and injectors from a newer model ls1.
    350rwhp would be achievable with that cam.

  3. #3
    Do you ever leave? paulzig's Avatar
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    The PAC 1518 is a beehive, you could go to a more manly double spring in the PAC like 1204 or 1205, couple that with a 5/16 .080" thick wall pushrod like a Trend or Comp .. .Maybe the Comp cams trunnion upgrade ...

    The pushrods are worth a bit, as are the spring, people love the beehive sh-t but they are a liability as far as I go, call me old school call me a tosser whatever : )

    The rollmaster is always a good option, may have to grind on the back of the oil pump to fit, if the pump is shot get a new one ... Pretty easy ...

    it will do what you ask, 350RWHP

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    Would I be right in getting the 7.400 length pushrods or should I stick to standard length ? Been told no need for double row timing chain also . Is that right ? Been thinking of getting one of those 2 pce timing covers as well in case I want to change the cam again later on . Have you used one at all ?

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    Do you ever leave? cava454's Avatar
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    Ill double check when I get home but I have a replacement roll master chain which if your keen you can grab off me.

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    Sweet !!!! . Let me know . Cheers

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    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by 2AVOID View Post
    Would I be right in getting the 7.400 length pushrods or should I stick to standard length ? Been told no need for double row timing chain also . Is that right ? Been thinking of getting one of those 2 pce timing covers as well in case I want to change the cam again later on . Have you used one at all ?
    F-ck mate, you've increased the load on the valvetrain, who told you to keep a stock chain on there, why not just buy a new performance chain if the engine is gonna be used for performance???? 2 piece timing chain no I havent but if you wanna do cam testing like 5-6 cams then maybe ... I thought 7.4 " was stock, I put a set of those comp/T&D rockers on and I needed 7.15" pushrods to get adjustment, so it is what it is ...

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    Do you ever leave? cava454's Avatar
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    Timing chain is motor out sump off isn't it?

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    Standard pushrod length is 7.318" , I read somewhere that most use a 7.4 pushrod to get the right pre load on the lifters as aftermarket cams have a smaller/lower centreline . One of the tuners of st comm said I can keep the standard lifters and oil pump . No need for a double row tc , can use a single row . Might change the cam at a later stage when I do the heads .

  10. #10
    Do you ever leave? HPE PETE's Avatar
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    you can do it in the car but its very tricky, i have bent a spanner in to shape to undo the oil pump pickup bolt then i undo it with a magnet, getting it back in is pretty hard i wrap wire around the bolt to get it back in the pump then you can use the wire to wind it up in to the pump the use the bent spanner to tighten it, in 30 or so in car cam swaps i have only dropped the bolt once

    7.350 is the most common length with stock rockers and LS7 or tie bar lifters

    i have used the 2 peice cover and its a complete waste of time, from memory you cant get the thrust plate bolts out or something like that cant remember exactly what it was but i ended up removing the balancer and timing cover

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    Do you ever leave? HPE PETE's Avatar
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    single row is fine enough for most applications when we build an engine out of car i use a double row chain cause if you need to clearance the timing cover its easier to do on an engine stand

    dont listen to half of what most tuners tell you about what you need because they are lazy and they can make quick money by not doing anything properly, they say leave the stock pump cause they are too lazy to remove the old one in the car, its easy money for them to flick the old chain off slide cam out and put another one straight back in.....the stock oil pump has issues with the pressure relief sticking open....i know of plenty of cars that havent had a prob but i know of many that have, a mate of mine did a cam swap without changing oil pump tiiming chain at my workshop and he was too lazy to do it properly ....its still going fine though its up to you also depends on how many kays the engine has done as well

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    Motor is out of the car so I was thinking to do the timing chain and lifters as well . What I need is a list of parts that I MUST change to fit this cam and for the motor to be reliable .

  13. #13
    Do you ever leave? cava454's Avatar
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    Must do springs. Everything else is optional..

    When I did my head and cam I went with this:

    Cam and Springs
    HPE Pete heads
    Ls7 Lifters
    Stock Head gasket, thinner will add comp
    Valley cover gasket
    Intake gaskets
    Trunnions upgrade on rockers
    Arp head bolts
    Arp balancer bolt
    Walbrow Fuel pump
    42lb injectors
    Arp Cam bolts

    Was going to do timing chain but couldn't get the oil pump bolt off and wasn't taking the motor out to do so. Maybe one day I will. If I can be bothered, or if Pete flys down and wants to do it for me haha

  14. #14
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    Quote Originally Posted by cava454 View Post
    Must do springs. Everything else is optional..

    When I did my head and cam I went with this:

    Cam and Springs
    HPE Pete heads
    Ls7 Lifters
    Stock Head gasket, thinner will add comp
    Valley cover gasket
    Intake gaskets
    Trunnions upgrade on rockers
    Arp head bolts
    Arp balancer bolt
    Walbrow Fuel pump
    42lb injectors
    Arp Cam bolts

    Was going to do timing chain but couldn't get the oil pump bolt off and wasn't taking the motor out to do so. Maybe one day I will. If I can be bothered, or if Pete flys down and wants to do it for me haha
    How did you go with that timing chain bud ? Where did you get the ls7 lifters from ?

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    Also should I look at getting a high volume oil pump or just replace it with a standard one ?

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