Pushrod Length
Thread Starter
Teching In
Joined: Feb 2007
Posts: 8
Likes: 0
From: N.J.
Pushrod Length 
just to get that out of the wayA 2004 ls6 w/the hollow .6mm (.0236)longer valves and stock cam(smaller base circle than LS1) = 7.4 pushrods
same engine w tr224/114lsa cam (LS1 base circle)
.0236/1.7(stock rockers) = .0138823(.0139)
(stock pushrod)7.4 -.0139= 7.3861
so 7.4 is .0139 to long?
and 7.375 is .0111 to short?
I know the only way to be sure is a pushrod length tool, but am I going in the right direction?
Originally Posted by Quicksilver123104
just to get that out of the wayA 2004 ls6 w/the hollow .6mm (.0236)longer valves and stock cam(smaller base circle than LS1) = 7.4 pushrods
same engine w tr224/114lsa cam (LS1 base circle)
.0236/1.7(stock rockers) = .0138823(.0139)
(stock pushrod)7.4 -.0139= 7.3861
so 7.4 is .0139 to long?
and 7.375 is .0111 to short?
I know the only way to be sure is a pushrod length tool, but am I going in the right direction?
Thread Starter
Teching In
Joined: Feb 2007
Posts: 8
Likes: 0
From: N.J.
Originally Posted by brad8266
Where did you get that formula at? I dont think it is right. What is the base circle of your new cam?
the 2002-4 LS6 ZO6 cam has a smaller base circle because of the longer valves
Most aftermarket cams are listed as LS1 cams
I don't have a new cam yet, still deciding
Originally Posted by Quicksilver123104
Just going by the consensus of the searching I did
the 2002-4 LS6 ZO6 cam has a smaller base circle because of the longer valves
Most aftermarket cams are listed as LS1 cams
I don't have a new cam yet, still deciding
the 2002-4 LS6 ZO6 cam has a smaller base circle because of the longer valves
Most aftermarket cams are listed as LS1 cams
I don't have a new cam yet, still deciding
new pushrod length= ((Old cam base-New cam base)/2) + (old pushrod length-head gasket changes-head mill amount)
Stock LS1 cam base is 1.553, stock pushrods are around 7.39.
Here is what my setup was 232/236 cam, heads milled about .030 and went from a .050 gasket to a .040.
((1.553-1.450)/2) + (7.39-.030-.010) = 7.4015
I went with 7.4 rods.
Consenus is not fact, do the actual measurements yourself to be accurate. I recommend using a pushriod checker either way. You have too much rod and your preload will be too much and lifters will wear easily, too less rod and you will have a noisy valvetrain.
Last edited by brad8266; Mar 7, 2007 at 08:18 PM.
Thread Starter
Teching In
Joined: Feb 2007
Posts: 8
Likes: 0
From: N.J.
Originally Posted by brad8266
Aftermarket cam do not have the same base circle as the stock ls1 cams do. Aftermarket cams have smaller base circles. here is the correct formula.
new pushrod length= ((Old cam base-New cam base)/2) + (old pushrod length-head gasket changes-head mill amount)
Stock LS1 cam base is 1.553, stock pushrods are around 7.39.
Here is what my setup was 232/236 cam, heads milled about .030 and went from a .050 gasket to a .040.
((1.553-1.450)/2) + (7.39-.030-.010) = 7.4015
I went with 7.4 rods.
new pushrod length= ((Old cam base-New cam base)/2) + (old pushrod length-head gasket changes-head mill amount)
Stock LS1 cam base is 1.553, stock pushrods are around 7.39.
Here is what my setup was 232/236 cam, heads milled about .030 and went from a .050 gasket to a .040.
((1.553-1.450)/2) + (7.39-.030-.010) = 7.4015
I went with 7.4 rods.
Do cam manufactures list base circle numbers or you just measure it once you get it
Teching In
Joined: Jul 2004
Posts: 47
Likes: 0
I'm interested in this too...I was given a cam from an 03 CTS-V / LS6 and with less than 1000 miles on it, it appears to be the .550 lift version. I have a stock 02 LS1 and am keeping the stock LS1 heads. I want to do this cam swap-upgrade myself, what am I going to need??
And is there any way to know this pushrod length up front as this is my daily driver.
Spring brand recommendation ?
Pushrod brand and length?
Anything else to replace while I'm in there?
And is there any way to know this pushrod length up front as this is my daily driver.
Spring brand recommendation ?
Pushrod brand and length?
Anything else to replace while I'm in there?
Trending Topics
Teching In
Joined: Jul 2004
Posts: 47
Likes: 0
K, I've been doing some more reading in here...the Camguide is excellent, and I have gone thru the walkthru of installing a Cam by JMX.
It looks like its worth the effort...for me I want a daily driver that will have some extra grunt and still pass emissions so the Ls6 cam seems like enough.
It looks like its worth the effort...for me I want a daily driver that will have some extra grunt and still pass emissions so the Ls6 cam seems like enough.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
