Pushrod Length
06-13-2007, 05:23 AM
#1
12 Second Club
Thread Starter
iTrader: (4)
Join Date: Oct 2006
Location: Chesapeake, VA
Posts: 300
Likes: 0
Received 0 Likes
on
0 Posts
Pushrod Length I have a 228/232 cam .6xx, .6xx on a 111 lsa, would the stock length pushrods be sufficient??? Or would I need shorter or longer pushrods?? Not sure what the base circle is. Any help would be appreciated.
06-13-2007, 05:37 AM
#2
TECH Resident
I brought a cam a simular size to yours, I also brought heads and push-rods from the same sponser.
Their message was:-
"The 7.425" pushrods we usually like to recommend to keep you lifter preload the same as the base lobe on the cam is often smaller on aftermarket cams."
Their message was:-
"The 7.425" pushrods we usually like to recommend to keep you lifter preload the same as the base lobe on the cam is often smaller on aftermarket cams."
06-13-2007, 09:45 AM
#4
Registered User
Join Date: Mar 2004
Location: Austin, Texas
Posts: 199
Likes: 0
Received 0 Likes
on
0 Posts
We have had good luck running the Comp Cams 7.400 length pushrods, but I have seen a 7.350 length pushrod go into more than a few LS1 motors.
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
Originally Posted by KONG
I have a 228/232 cam .6xx, .6xx on a 111 lsa, would the stock length pushrods be sufficient??? Or would I need shorter or longer pushrods?? Not sure what the base circle is. Any help would be appreciated.
06-13-2007, 01:51 PM
#5
12 Second Club
Thread Starter
iTrader: (4)
Join Date: Oct 2006
Location: Chesapeake, VA
Posts: 300
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by PortPros1
We have had good luck running the Comp Cams 7.400 length pushrods, but I have seen a 7.350 length pushrod go into more than a few LS1 motors.
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
06-13-2007, 01:54 PM
#6
12 Second Club
Thread Starter
iTrader: (4)
Join Date: Oct 2006
Location: Chesapeake, VA
Posts: 300
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GuitsBoy
Most aftermarket cams have a 1.450 base circle as opposed to the stock 1.550, meaning youll need a .050 longer pushrod to compensate. Stock PR's are 7.380, so a 7.425 will be .045 longer. Almost perfect.
06-13-2007, 01:58 PM
#7
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by PortPros1
We have had good luck running the Comp Cams 7.400 length pushrods, but I have seen a 7.350 length pushrod go into more than a few LS1 motors.
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
You can check if the valves are hanging open using compression tester, I would install the 7.400 in one cylinder and check to see if the valves are closed. It may save you some time.
Harold
I run 7.4's now... Trending Topics
06-13-2007, 02:00 PM
#8
Originally Posted by KONG
That is something that I did not know. I figured I would be able to get away with 7.400 as recommended by my engine builder. I guess sometimes they can be wrong too. This is a problem that I do not want to let go, and potentially mess up a brand new motor. Thanks for the advice man.
06-13-2007, 02:13 PM
#9
12 Second Club
Thread Starter
iTrader: (4)
Join Date: Oct 2006
Location: Chesapeake, VA
Posts: 300
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GuitsBoy
7.400 is not necessarily incorrect, it simply means youre running .025 less lifter preload. The hydraulic lifter fills with oil and takes up and additional play. if the cam's base circle is indeed 1.450, then 7.425 will get you closer to stock. But I am sure the car will run just fine with 7.350 or 7.400. I remember my stock lifter preload being on the order of .080, so theres some wiggle room.
Hey thanks again man for the advice. I didn't realize there was so much "wiggle" room as far as preload goes. I am still learning at all this stuff, I think I need to do better research on parts next time I do an engine build up.
