- Aug 1, 2008
- Reaction score
- Vehicle Year
- 85 & 94
- Make / Model
- Engine Size
The 4 engines that I've built up - 2 with the 410 and 2 with the 422, have all required longer pushrods.so up to now iv herd both ways that you can and you cant use stock valve train with the 422
About how much longer?The 4 engines that I've built up - 2 with the 410 and 2 with the 422, have all required longer pushrods.
I would recommend getting a pushrod length checking tool and verifying when installing either of these cams - that's what I used.........
....unless it was ground on reduced base circles (hint hint)
I think Blu also needs to follow your advice as it pertains to what you may have to say also......................BLU! Be very wary of posts that guys make claiming this or that.
I am learning the importance of proper valve train geometry and plan on doing a custom high compression noss build with a #422 cam but i see no one has commented in quite a few years so taking a shot in the dark for some much needed info... So since hydraulic lifters require a preload between .020" & .060"would you just add .030" to the final measurement of your adjustable pushrod once you adjusted the slack and the pushrod/rocker arm is snug??I think Blu also needs to follow your advice as it pertains to what you may have to say also......................
Built any performance 4.0's lately, Jim? (I'm not talking about just 'bolt-ons')
Several of us over on the 'other site' have put together some decent performing 4.0's and I don't remember a single one of them being able to use 'stock' pushrods - the 4 of them I built, all needed longer pushrods to maintain proper lifter loading, but, as I said in my previous post (which you obviously didn't read), a pushrod length checker is recommended to verify. I don't give out specific lengths any longer as there's too many variables to deal with to get the lifter plunger at .030 preload. Smith Brothers (recommended by Dennis at Comp Cams a long time ago) is more than happy to provide an adjustable pushrod to check these out.
A stock pushrod with no preload on the lifter can easily wear out the rocker arm from the constant 'slamming'.