Broken lifter? Need Help
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
The 305 was a bad choice......this is what I called the "Fairgrounds Cam" back in the day......in the 80's it was marketed as the "Pro Street" cam.....the only way that cam works is with bad *** heads, a tunnel ram, and a 4/5 speed trans......lots of gear......
Sure sounds good though...LOL.
Jebby
Sure sounds good though...LOL.
Jebby
Thread Starter
Instructor
Joined: Feb 2021
Posts: 144
Likes: 17
The 305 was a bad choice......this is what I called the "Fairgrounds Cam" back in the day......in the 80's it was marketed as the "Pro Street" cam.....the only way that cam works is with bad *** heads, a tunnel ram, and a 4/5 speed trans......lots of gear......
Sure sounds good though...LOL.
Jebby
Sure sounds good though...LOL.
Jebby
I don't believe a .0525 lift is going to be an issue with this cam.
However, that cam has gobs of duration. So much so, that it might be a nightmare on the street. That cam doesn't even go to work until 3,000 RPMs.
A quick Google search showed at Jegs:
525 lift / 305 dur
*3,500 stall speed converter a must.
*Big gears in the back a must.
*10.5 comp ratio or more a must.
*Do you have all these requirements?
However, that cam has gobs of duration. So much so, that it might be a nightmare on the street. That cam doesn't even go to work until 3,000 RPMs.
A quick Google search showed at Jegs:
525 lift / 305 dur
*3,500 stall speed converter a must.
*Big gears in the back a must.
*10.5 comp ratio or more a must.
*Do you have all these requirements?
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Ok. It will still be a challenge to run properly on the street. Already installed? Or returnable? You will not be happy with this duration.
This is a classic example of why one should always use the 800 numbers at a cam company of your choice for selecting a cam.
Give them your specs, about 20 questions. They, in return will select for you the perfect cam.
But, you have to know everything about the engine. A data sheet with specs. Not just what someone told you was inside.
This is a classic example of why one should always use the 800 numbers at a cam company of your choice for selecting a cam.
Give them your specs, about 20 questions. They, in return will select for you the perfect cam.
But, you have to know everything about the engine. A data sheet with specs. Not just what someone told you was inside.
Thread Starter
Instructor
Joined: Feb 2021
Posts: 144
Likes: 17
Ok. It will still be a challenge to run properly on the street. Already installed? Or returnable? You will not be happy with this duration.
This is a classic example of why one should always use the 800 numbers at a cam company of your choice for selecting a cam.
Give them your specs, about 20 questions. They, in return will select for you the perfect cam.
But, you have to know everything about the engine. A data sheet with specs. Not just what someone told you was inside.
This is a classic example of why one should always use the 800 numbers at a cam company of your choice for selecting a cam.
Give them your specs, about 20 questions. They, in return will select for you the perfect cam.
But, you have to know everything about the engine. A data sheet with specs. Not just what someone told you was inside.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
A rocker arm tick, meaning you are 90% sure its a rocker arm, is from too much valvelash. Seldom do the rockers themselves contribute to valvetrain noise.
A worn cam lobe, bent pushrod, lifters, etc will make noise.
If you are hearing a rocker tick, pull a valve cover. Start the engine and locate the questionable rocker. Set the lash.
If that does not fix the issue, look for a broken valve spring.
A worn cam lobe, bent pushrod, lifters, etc will make noise.
If you are hearing a rocker tick, pull a valve cover. Start the engine and locate the questionable rocker. Set the lash.
If that does not fix the issue, look for a broken valve spring.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
The 305 was a bad choice......this is what I called the "Fairgrounds Cam" back in the day......in the 80's it was marketed as the "Pro Street" cam.....the only way that cam works is with bad *** heads, a tunnel ram, and a 4/5 speed trans......lots of gear......
Sure sounds good though...LOL.
Jebby
Sure sounds good though...LOL.
Jebby
Hopefully you will be able to work something out. 
Keep us posted.
Last edited by Buccaneer; Nov 18, 2021 at 09:39 PM.
Le Mans Master
Joined: May 2007
Posts: 5,028
Likes: 1,120
From: North tonawanda NY
I'll bring it up since no one else will... Old school single pattern cams are old school and not as popular today for a reason. They often provide a bit more power on the lower end but tend to give up twice that power at higher rpms. Engine Masters literally just did an episode on this a couple weeks ago comparing the two on a dyno. Basically its much the same type of tradeoff as a single plane intake vs dual plane only with the single pattern cam behaving more like a dual plane intake. If the heads flow poorly on the exhaust side it might minimize the difference and if this was a street cruiser the slight increase at the lower rpms might even be beneficial but since it was mentioned this is not, its something to consider, especially if better heads are a future possible upgrade since the cam is not as simple to swap as the intake manifold.
Last edited by augiedoggy; Nov 19, 2021 at 12:34 PM.
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