What are symptoms of #9 or #10 camshaft lobe wear?

[cobracmdr]

Why those?  Stock style studs fit the 3100 1.6 rockers fine. 

You need those studs because with the LS1 springs you have to manually adjust the valve lash.  You can just torque the nuts down anymore you will have to follow the gen1 valve adjustment procedure.  But the motor will be much tighter with those springs in there.  In fact I have a set of heads in the garage with that setup on it which is going to find it's way into the tgp eventually.

Ken

[TGed]

I am not saying you're wrong, I just never read that anywhere from all the folks that swap in those springs.


Is this just a 3.1/2.8 thing or is it across the board to the 3x00 engines also?

[RICHTGP]

Thanks for the valve work info. I never could have come up with this setup if I tried. Which cam did you think was a better choice of the two listed?  Also, I could not find cams with these specs on the Jegs or Summitt websites. Where were these particular cams found? Also, still need some injector info to run these
cams.  Will either of these cams reach 6000 plus RPM and still be streetable?  I anyone has these valve parts that were recommended or know someone that has them, please contact me or give me contact infor where I can contact them. Thanks again for all input. May this pushrod outperform these darned overhead cams!!!!!! :icon_biggrin:

[TGP Nick]

I wouldn't try to get up to 6,000 RPM unless you have done some serious porting and have the valvetrain to support it..

When stock, these engines start running out of breath over 5,000 RPM.

[cobracmdr]

I am not saying you're wrong, I just never read that anywhere from all the folks that swap in those springs.


Is this just a 3.1/2.8 thing or is it across the board to the 3x00 engines also?

right I'm not disagreeing with you at all, if you JUST want to run 1.6 rocker arms all you need is them.  If you want to run the valvespings you need the gen 1 studs to get the right opening and closing pressure.

[cobracmdr]

Thanks for the valve work info. I never could have come up with this setup if I tried. Which cam did you think was a better choice of the two listed?  Also, I could not find cams with these specs on the Jegs or Summitt websites. Where were these particular cams found? Also, still need some injector info to run these
cams.  Will either of these cams reach 6000 plus RPM and still be streetable?  I anyone has these valve parts that were recommended or know someone that has them, please contact me or give me contact infor where I can contact them. Thanks again for all input. May this pushrod outperform these darned overhead cams!!!!!! :icon_biggrin:

do a search of some of my old rebuild threads.  I ran an engle turbo cam actually here is the specs:

(valve lift: in .458, ex .440) (Duration: in 260, ex 256)(cam lift: in 305, ex 295)(Duration at .050: in 216, ex 210)(Lobe center 114)


check out crane's website for the 2020 cam, Ryan (Rdubya) put that cam in the engine he build when he owned my current TGP.  It is pretty civil and runs fine without the valvesprings and all that.  Although I'm sure it could benefit from a little more spring pressure.

sure it will be streetable they are not wild cams.  Honestly from what I have read a real wild cam on a turbo engine will not do all that much.  You don't want lift you want valve duration to keep the valve open longer to get more air in from the turbo.  You are going to need tuning for sure. 

If you want stock injectors get some 22 lb early 90's TPI corvette injectors with the EV1 connector.  They will drop in the manifold and connect to the stock wiring harness. 

for good prices on the valve parts check out rockauto.com or call Gmotors.com they are caddillac dealer in florida.  If you say you are an internet customer they will give you a great price on the parts.  Everything I think ran me around $250 for the valve stuff.

Good luck and do a search there is a lot of this information posted on here.  Especially about injectors too.  Most of you guys on here like to run the 5.0 mustang injectors yellow tops I think you call them?

Ken

[TGP Nick]

Most of you guys on here like to run the 5.0 mustang injectors yellow tops I think you call them?

Yes, they are C302 Yellow Top injectors.  They have a better spray pattern than the old Multecs.  I have a set in my TGP and it was a night and day difference in driveability over the factory Multec injectors.

[TGed]

right I'm not disagreeing with you at all, if you JUST want to run 1.6 rocker arms all you need is them.  If you want to run the valvespings you need the gen 1 studs to get the right opening and closing pressure.

Shouldn't the install height and seat pressure be ideally the same if the lsx spring is being used?  While the only thing that should change are the binding rates.

This has me confused as there is a gen 2 around here with lsx springs and stock studs.  Been running around for a couple years like that.

[cobracmdr]

I'm shooting for opening and closing forces per the crane website for a 2020 cam.  I'm not sure what you guys are doing.  If you don't have those spring force numbers you are probably getting less than ideal force out of the lsx springs and therefore are still getting valve float.  But i'm not an expert but this makes sense to me.

With the adjustable studs you are getting more preload in the spring.  Hookes law and all that jazz F=-kx where k is the spring constant of the spring and x being displacement.  You get the idea.

Ken

[TGed]

I knew someone (you) spent a load amounts of time investigating into detail about this.  I applaud that. 

Personally I probably will sell my lsx springs and use the springs that come with my next cam like how I always done.  It's easier and I never really push the envelope that hard with the rpm's or craZy lift.  I try and make most power at the lowest rpm's possible.

[TGed]

Question:  Did you measure the stock spring (new) and the (new) lsx spring height and pressures?

[RICHTGP]

Is the reason these motor s run out of breath above 5000 rpm caused by valve float?

[TGed]

No its the poor LIM design.  Valve float is from just crap springs GM slapped in there.

[RICHTGP]

So you are saying springs will or wont help? If they will help, which ones in your opinion and what would the benefit be? Thanks

[RICHTGP]

Also checked out the 2020 Crane cam, but was confused since it said the RPM range was idle to 4200 RPM> :icon_confused: