got the 410 cam from comp. what is the reasoning behind getting longer pushrods with this camshaft. ive done serch on here and rps and trs. could not come up with a reason to get them. just people saying u need them and u do not need them. thx.

 

IF the 410 cam is a regrind of the factory cam, and not a new cam, the longer pushrods would compensate for the lower point that the lifters will be sitting at while on the base circle.

BUT this would only be true for a regrind. OR any cam using a smaller than stock base circle.

 

The comp cams are smaller base circle over stock. You really should upgrade the springs too.

 

so how have many people gotten by with not installing longer pushrods n not have problems with valvetrain noise

 

When replacing the cam with a higher performance unit you should do the Cam Kit route.
New Springs, rated for your cam, new pushrods, all for two reasons.
1) being the manufacturer’s required length for the new cam, based on their manufacturing process (this applies to both the Springs and the pushrods) and 2) being the higher rpms you will be running and valve float so higher rate springs will be needed.
If this is just an OEM Spec replacement cam then new is good just in case there is something wrong with the old stuff and you wouldn’t want to get the engine running and have a pushrod or valve spring fail.

 

I have never heard of anyone not installing the longer rods.

 

anybody have a know good length for pushrods with the 410 cam? or is this a factor that is different with each one cut

 

ookk. so after searching online for over an hour trying to find a pushrod checker. no luck finding one that is short enough to work. anybody know where to get one for this application

 

Everyone seems to recommend these guys for new push rods. I wanna say you need 5.5 but don't quote me on that.

http://www.pushrods.net/index.html

Summit sells push rod length checking tools but they don't go smaller than 5.8 inches which is I believe is too long for the 4.0.

http://www.summitracing.com/search/?...d%20tool&dds=1

I do think there is more info over at RPS on this subject but I have not searched for a while. I decide to do a 5.0 swap instead.

 

thx for the info blhde... there anybody else that knows length or where to get correct checking tool.. i'd really like to get this job done correctly.

 

options?

 

i'd really like to have my truck runnin one these days.. anybody that has done a cam swap where did u get the pushrod checker from..i cannot find one shorter than 5.8".. been serching for bout 4 days now...

 

bump.