bearcatt

iTrader: (41)

Does anyone have any input or knowledge about these pushrods ?

LS1 Pushrods 5/16 diameter 0.120

http://www.cammotion.com/7400-LS1-Pu...7-16-P174.aspx


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PREDATOR-Z

Yes good product in high lift cam applications for better valve control and reduced pushrod flex.

vettenuts

iTrader: (4)

You buy a lot more stiffness with outside diameter than wall thickness if that is what you are seeking. Have you considered Manton 11/32" OD pushrods?

PREDATOR-Z

True, on some heads though it is often wiser to enlarge p-rod passage to run bigger diameter rods. Basicaly always check for clearance.

JFM-jr

iTrader: (23)

Another point is these Cam Motions are in .050 increments that dont open many doors in regards to lifter preload options. The Mantons are made to size order, modular, non mass produced pushrods. These Cam Motions would be a better choice than the run of the mill .080 Manley etc pushrod tho'.

racer7088

They look to be manton or smith brothers pushrods and are nice pieces.

bearcatt

iTrader: (41)

Thanks guys,

Eventhough I have a small cam ( for now ) , my spring pressure is pretty extreme. The Cam Motions .120 don't cost much more than Comp or Manley .080.

I would love to be able to run some 11/32".
I should have considered that before I installed the heads.

I have Comp Cam 7.350 and 7.425 pushrods from past projects.
I also have a brand new set of stock GM pushrods too... lol
Ironically I need the stock length 7.400 ( actually 7.375 ) pushrods for my setup.

Manton and Smith Brothers sound interesting too.

I wonder what the weight difference would be between a 11/32" .080
versus a 5/16" .120 ?


EDIT: Called Cam Motion, they have a set but it's an actual 7.392.
The would give me to much preload. The part about .050 increments
is what they offer.

So it's either .080 or custom order a set.




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JFM-jr

iTrader: (23)

What kinda pressures are you running? If they are that extreme I hope there is a lifter in there to handle it. Call Terry Manton the guy is an absolute pleasure to speak with. You wont be sorry he will set you up with the best pushrod possible to fit your application.

vettenuts

iTrader: (4)

Unless you are in a super hurry, I would call Terry and order one pushrod. Then you can mark it up with a Sharpie or blueing and install in intake and exhaust checking for contact issues. If you are good, then 11/32" would be my first choice. Stiffness is a function of outside diameter to the fourth power minus inside diameter to the fourth power (and a few other things but those would be constant between two pushrods of the same length) so with a heavy valve spring there is a lot to be gained if you can get the 11/32 to work. Weight on the lifter side is of less importance.

racer7088

Vettenuts is right. you can buy just one if you are not in a hurry and then order the other 15 when you know they wre right or change it and only lose one pushrod instead of 16.

bearcatt

iTrader: (41)

I did call and talk with someone at Smith Brothers earlier today.
They can make anything you want. I tried to find Manton by seaching on google but didn't have any luck.


This is what I have now.

Livernois Valve Spring Specs
Install Height: 1.820
Max. Valve Spring Lift: .690
Spring Pressure Closed: 150lbs
Spring Pressure Open: 382@.620 / 410@.680
Coil Bind: 1.100
Retainer Material: Titanium
http://www.livernoismotorsports.com/...t.phtml?p=1575


This is what I had.

LS6 Yellow Spring Specs
Install Height: 1.800
Max. Valve Spring Lift: .570
Pressure (Closed) = 340 N @ 45.75mm / 76# @ 1.80"
Pressure (Open) = 980 N @ 33.55mm / 220# @ 1.32"
Coil Bind: ???
Retainer Material: chrome/silicon/vanadium steel
'02-'04 LS6: 0.525" (14.01mm) / 0.547" (13.91mm)

I'm running new LS7 lifters. My cam lift is .525/.532.
Honestly I do not know what the LS7 lifter limits are in terms of spring rate.
I searched and can't find any specific info on it.




I did call and talk with someone at Smith Brothers earlier today.
They can make anything you want. I tried to find Manton by seaching on google but didn't have any luck.

It certainly is worth doing it right the first time. With that said there does come a point and time when I would like to get my car up and running. It's becoming a one thing leads to another scenario. I just bought and installed some new Stage II Livernois heads. I had previously installed some stock 243 heads with the sodium/potasium filled valves and yellow springs. I was pretty happy with the way my car was running. It was an upgrade for me compared to what I had.

So what happend ??? ...

I also had the Harland Sharp trunion upgrade with stock rockers. I found out there was a recall on thier INA caged bearing upgrades, the bearings were causing bad galling on the trunion shafts. They were offering a better bearing upgrade... I only had my car running for a week before I found out about this. When I removed a rocker for inspection, I had the old style INA cages bearings. When I went to remove all the rocker arms, one of the Harland supplied rocker bolts broke off into the head. I tried the remove the broken bolt with no luck. I then tried a time-sert. I wasn't happy with that so I decided to upgrade the heads since I was going to pull them off again.
I also went with ARP head studs this time.

Since I needed the correct length pushrods, I found out about Cam Motion. I didn't know much about them and couldn't pull up much by searching, so I posted here and got all the big boys.



That's some good advice I can use on another build. My motor isn't anything super exotic, it's more of a bang for the buck motor. I'm learning this can go on and on. pushrods, lifters, rockers, heads, bottom end, fuel pump, injectors ... more and more ... better and better...

Vettenuts is almost always right and very knowledgeable. He is always very helpful as well. I just decided to get some funky .080 Comp pushrods.

Predator-Z has always been very helpful and is also very knowledgeable.






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vettenuts

iTrader: (4)

Link for Manton Pushrods if you need it: Manton Pushrods

JFM-jr

iTrader: (23)

LOL welcome to the world of being **** retentive. MY LS2 budget build is taking forever for the reasons above.

Amen there are a list of guys here that I owe a ton of gratitude. These guys are always willing to share priceless usefull info and have never seemed annoyed or put off with them sharing their time. They know who they are and this whole site is worlds better having them here. THANK YOU!





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bearcatt

iTrader: (41)

Thankyou ... They are not to far from me.
Wow! They look to have a myriad of choices.


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bearcatt

iTrader: (41)

Sounds like you have a nice project going on there.

I have a dream motor in mind. Only time and money gets in the way of that...
not to mention California emissions. LOL

Thank god we have LSx powered motors.
Could you imagine building a Ford modular 4.6L ?




Here's another real good example of one of Vettenut's contributions.
I have this book-marked.

https://ls1tech.com/forums/generatio...l#post11792496

https://ls1tech.com/forums/9926884-post11.html

I still say Pred-Z is very helpful too. He's helped me out on occasion.



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DONAIMIAN

iTrader: (18)

I have Manton PR's in my motor. Awesome pieces, very quality stuff.

bearcatt

iTrader: (41)

May I ask about your Manton PR specs ? ... just curious.






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DONAIMIAN

iTrader: (18)

Im using the 3pc 5/16 .120 wall hardened version in 7.400 length (I think). I ordered them through Erik K. (racer7088). Im using the hardened version as my rockers use guide plates. (if your not using guide plates you wont need the hardened version) Heres what they look like.

bearcatt

iTrader: (41)

Those look like works of art... very nice.


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JFM-jr

iTrader: (23)

I just ordered an 11/32 pushrod from Manton today and will test fit in my 5.3 head. I will report back my findings.