pushrod length

[fryedaddy]

if i change from a hyd flat tappet cam to a hyd roller,does the pushrod length usually change?

[blykins]

Always.  Lifters are a lot taller on a roller.

[fryedaddy]

so does that mean i need ,roller cam,roller lifters,pushrods,and matching valve springs for the swap,i already have roller rockers

[blykins]

Yes and a steel distributor gear.  I'd also recommend a steel thrust plate.

[pbf777]

      Always be sure to converse with the camshaft maker of the "appropriate" distributor drive gear material as there have been different cam-cores made available (read: "off-shore"  )which do not present as acceptable to what otherwise might be considered the norm.   

      And beware of those company "tech-guys" that might respond to the inquiry: "Oh, those cams use the O.E.M.'s standard gear"!  If so, follow up with: "So, what's the "standard gear" material to start with"?     Nine times out of ten they won't be able to answer that; and if such proves to be the case, go somewhere else for your cam!   

      Scott.

     

[fryedaddy]

thanks,im glad you reminded me of the timing gear and thrust plate