How much can GM roller lifters take?
09-16-2002, 01:06 PM
#11
Guest
Posts: n/a
You got it covered!
Wow Tom, what a great engine! I don't think you need any help from me! That is sure going to be a big camshaft though, I hope you have bumped up the compression a little. I would think that your maximum horsepower will be over 6,000 rpm. I hope you are ready to deal with those big rpm numbers. Big valve springs and lots of downward pressure on the lifters at idle! Buy a valve spring compressor and valve spring pressure tester for maintenance purposes.
Good Luck
Let me know how it runs!
Sincerely
Dennis moore
Good Luck
Let me know how it runs!
Sincerely
Dennis moore
09-16-2002, 01:38 PM
#12
Hey Tom,
I believe they are p/n 16535-16 and they use the stock length push rods. Only the shell of the lifter is extended.
Dennis has a good point (obviously); that cam will take some rpm to get the hp!
Just to add a thought, you may want to watch for reversion with anything other than real good exhaust!
Dave
I believe they are p/n 16535-16 and they use the stock length push rods. Only the shell of the lifter is extended.
Dennis has a good point (obviously); that cam will take some rpm to get the hp!
Just to add a thought, you may want to watch for reversion with anything other than real good exhaust!
Dave
09-16-2002, 01:49 PM
#13
Registered
Dennis,
No doubt about it, I wouldn't go any bigger on the cam.
To be Frank, I wouldn't of gone quite that much myself but My guy assures me that it will make strong useable power.
We figured the compression at about 9 to 1 with the mods that have been done so far.
He has done the same exact combo a number of times and assures me it will idle 0k around 850-900 rpm and make between 550 & 560hp.
This guy has been around for over 30yrs building all kinds of High performance engines, street as well as marine. He has done a couple of engines for me in the past that have worked out very well including the one I am running now. When I questioned the size of the cam he just assured me I would not be dissapointed.
This change is going to be a project for over the winter so I will be sure to post the results in the spring when it's warm enough to go for the first test ride! That is unless I just get impatient and pull the motor, swap cams and try to get another couple of rides in before we get the cold weather !
No doubt about it, I wouldn't go any bigger on the cam.
To be Frank, I wouldn't of gone quite that much myself but My guy assures me that it will make strong useable power.
We figured the compression at about 9 to 1 with the mods that have been done so far.
He has done the same exact combo a number of times and assures me it will idle 0k around 850-900 rpm and make between 550 & 560hp.
This guy has been around for over 30yrs building all kinds of High performance engines, street as well as marine. He has done a couple of engines for me in the past that have worked out very well including the one I am running now. When I questioned the size of the cam he just assured me I would not be dissapointed.
This change is going to be a project for over the winter so I will be sure to post the results in the spring when it's warm enough to go for the first test ride! That is unless I just get impatient and pull the motor, swap cams and try to get another couple of rides in before we get the cold weather !
09-16-2002, 02:01 PM
#14
Registered
Hi Dave,
The Lightning headers I have are the restricted water allowing only a small amount of water to mix after the collector and utilizes overboard dumps for the majority of the water. This along with a LSA of 112 and keeping the idle speed set around 900 rpm should pretty much eliminate any reversion problems. The other thing that is not a bad idea is to rev the engine up just a little before shutting down.
I know that the cam I'm installing is going to move the HP band as well as the torque band up & if it wants to run much over 5300 with the prop I have I will just have the prop re-worked by Joel Bronson again.
The Lightning headers I have are the restricted water allowing only a small amount of water to mix after the collector and utilizes overboard dumps for the majority of the water. This along with a LSA of 112 and keeping the idle speed set around 900 rpm should pretty much eliminate any reversion problems. The other thing that is not a bad idea is to rev the engine up just a little before shutting down.
I know that the cam I'm installing is going to move the HP band as well as the torque band up & if it wants to run much over 5300 with the prop I have I will just have the prop re-worked by Joel Bronson again.
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