Valve train help

pierce.corgan · Jan 26, 2023

Hey all, im very new to building a motor but i plan on doing cam and heads on my 89 fox (it already had a gt40 intake when i got it). i plan on using gt40 3 bar heads and a gt40 kr2 cam from flow tech inductions, how do i determine which rockers and pushrod length i need? any advice is appreciated since i really don’t know what im doing

AeroCoupe · Jan 26, 2023

Oh hell...take it to someone that knows how to do this. I only say this because you will need to degree the cam which sets the timing events, then you will need a set of solid roller lifters or hydraulic lifters converted to solid, adjustable pushrods with light valve springs, and the rocker arms you plan on using. Most people do not have any of the equipment other than the rockers.

Just to give you an idea as to how this can go is you could end up just needing stock length pushrods or like in my case you could end up having to weld the rocker arm stud bosses on the heads up and moving the location, installing taller rocker arm studs, and then ordering custom length pushrods.

Video on degreeing a camshaft:

View: https://www.youtube.com/watch?v=7cNoVRLb73c

Videos on checking push rod length:

View: https://www.youtube.com/watch?v=5MjAxnGeGKw

View: https://www.youtube.com/watch?v=5uvwcrMc1AQ

pierce.corgan · Jan 26, 2023

AeroCoupe said:
Oh hell...take it to someone that knows how to do this. I only say this because you will need to degree the cam which sets the timing events, then you will need a set of solid roller lifters or hydraulic lifters converted to solid, adjustable pushrods with light valve springs, and the rocker arms you plan on using. Most people do not have any of the equipment other than the rockers.

Just to give you an idea as to how this can go is you could end up just needing stock length pushrods or like in my case you could end up having to weld the rocker arm stud bosses on the heads up and moving the location, installing taller rocker arm studs, and then ordering custom length pushrods.

Video on degreeing a camshaft:
View: https://www.youtube.com/watch?v=7cNoVRLb73c

Videos on checking push rod length:

View: https://www.youtube.com/watch?v=5MjAxnGeGKw

View: https://www.youtube.com/watch?v=5uvwcrMc1AQ

yeah i wanted to see if it was something feasible to do on my own but i also have no problem taking it somewhere because i really don’t want to mess it up so that’s most likely what i’ll end up doing

General karthief · Jan 26, 2023

Checking Piston-to-Valve clearance

Little update for you hungry little Mustang tech addicts out there. Spent half the day yesterday running around town looking for random stuff I needed to progress on the build, but I spent the other half of the day spinning wrenches. In short, this is what I did: Stabbed the cam back in...

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Valve train help

pierce.corgan

Member

AeroCoupe

lube between the nut and the face. I know my lubes

pierce.corgan

Member

General karthief

wonder how much it would cost to ship you a pair

Checking Piston-to-Valve clearance

Similar threads

Valve train help

pierce.corgan

Member

AeroCoupe

lube between the nut and the face. I know my lubes

pierce.corgan

Member

General karthief

wonder how much it would cost to ship you a pair

Checking Piston-to-Valve clearance

Similar threads

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Privacy & Transparency