When do you need shorter pushrods?
Thread Starter
TECH Enthusiast
Joined: Dec 2002
Posts: 698
Likes: 0
From: Fort Worth
When do you need shorter pushrods? I am going to have a set of stock LS1 cut 30 thousandths and install a Comp 216/220 cam. Do I need shorter pushrods? Will I have trouble with the intake? Thanks alot.
If you take 30 off the heads, and the cam base circle is 30 under the you just use 7.400 pushrods (stock length) If the cam is a standard base circle then you would go with a 7.350 push rod, and shim up the rocker for proper lifter preload.
Originally Posted by strokedls1
If you take 30 off the heads, and the cam base circle is 30 under the you just use 7.400 pushrods (stock length) If the cam is a standard base circle then you would go with a 7.350 push rod, and shim up the rocker for proper lifter preload.
What happens if you don't have enough lifter preload?
I measured preload on a bone stock 98 and got .150"
That seems very excessive.
Is there some reason why the LS1 lifter needs this much?
Trending Topics
9 Second Club
Joined: Nov 2001
Posts: 1,445
Likes: 0
From: Bay Area, CA
Originally Posted by killer01ws6
What about a TR230/224.
stock heads, stock PR right?
stock heads, stock PR right?
to the poster of this thread if you find out your base circle of you cam is too big, I have some hardened pushrods for sale 7.25 in lenth PM me
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Originally Posted by killer01ws6
What about a TR230/224.
stock heads, stock PR right?
stock heads, stock PR right?
That will put you within about .010" - .015" of the stock spec with your non-milled heads and aftermarket cam..... No problem at all.
TECH Resident
Joined: Mar 2003
Posts: 770
Likes: 0
From: Troy Al
Originally Posted by Tin Indian
Well, get a set of Thunder Racing / Comp Cams 7.40" hardened rods. They are actually .015" longer than stock. [Stock rods are actually 7.385" long].
That will put you within about .010" - .015" of the stock spec with your non-milled heads and aftermarket cam..... No problem at all.
That will put you within about .010" - .015" of the stock spec with your non-milled heads and aftermarket cam..... No problem at all.
new in box... Do i need to sell them and get a set from TR??
Man I hate when I should have asked before I buy
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Killer ...
I think your hardened pushrods are more than likely made by Comp Cams.
Get a set of calipers and mic them yourself. If you can't get a mic, any machine shop will mic one of your stock rods and one of your new rods for free.
I will bet your new rods are .015" (15 thousands) longer than the stockers.
Ron,
I think your hardened pushrods are more than likely made by Comp Cams.
Get a set of calipers and mic them yourself. If you can't get a mic, any machine shop will mic one of your stock rods and one of your new rods for free.
I will bet your new rods are .015" (15 thousands) longer than the stockers.
Ron,
Originally Posted by white2001s10
What happens if you don't have enough lifter preload?
I measured preload on a bone stock 98 and got .150"
That seems very excessive.
Is there some reason why the LS1 lifter needs this much?
I measured preload on a bone stock 98 and got .150"
That seems very excessive.
Is there some reason why the LS1 lifter needs this much?
Originally Posted by white2001s10
What happens if you don't have enough lifter preload?
I measured preload on a bone stock 98 and got .150"
That seems very excessive.
Is there some reason why the LS1 lifter needs this much?
I measured preload on a bone stock 98 and got .150"
That seems very excessive.
Is there some reason why the LS1 lifter needs this much?
TECH Resident
Joined: Mar 2003
Posts: 770
Likes: 0
From: Troy Al
Originally Posted by Tin Indian
Killer ...
I think your hardened pushrods are more than likely made by Comp Cams.
Get a set of calipers and mic them yourself. If you can't get a mic, any machine shop will mic one of your stock rods and one of your new rods for free.
I will bet your new rods are .015" (15 thousands) longer than the stockers.
Ron,
I think your hardened pushrods are more than likely made by Comp Cams.
Get a set of calipers and mic them yourself. If you can't get a mic, any machine shop will mic one of your stock rods and one of your new rods for free.
I will bet your new rods are .015" (15 thousands) longer than the stockers.
Ron,
they are manleys, 7.40 #4130 swedged end, proseries..
SO are these true 7.40 and will they be good with my TR230.
Thanks,
Pete
You just need to put them in and see how many turns it takes to get 22 ftlb. The stock lifters use a lot of preload, but most after market require only 1/4 to 1/2 turn for proper preload. Contact the manufactuer if you want exact preload specs.
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Like I said, put a mic on one of them along with one of your stock rods and see what the difference is.
Really very simple indeed. No mic? ... Any machine shop will do it. Takes about a minute.
Really very simple indeed. No mic? ... Any machine shop will do it. Takes about a minute.
