Adjustable rocker arms...HELP!!
Adjustable rocker arms...HELP!! I recently installed a set of Rhoads lifters in my truck hoping they would restore some of my lost vacum at idle and make driving/tuning issues easier with my big cam.Long story short...I finished putting my motor back together with some other mods and...NO COMPRESSION!!(valves are open due to lifters) Well after talking to some people I've discovered that I need adjustable rocker arms and maybe shorter pushrods.My question is do any of you guys know who makes rocker arms that do not require modifying or machining the heads??I think I have it narrowed down to the Yella Terra's or the Comp's
TIA...Brian
TIA...Brian
I personally like the comps, but havent heard any failures of the YT's. If you have the money, you can also look at some of the true shaftmount rockers (TD, jessel, DRE)
Originally Posted by '02 Double U S-6
yella terras
BUMP...anyone else know if there is a adjustable rocker arm available that does NOT require modifying the cylinder head,that is the main thing.I am relying on you car guys...most of the truck guys dont run adjustable valve train and I know nothing about it.Thanks 
Originally Posted by DONAIMIAN
The only rockers that I know of that require head mods are the Cranes. At the most the other will require clearencing of the valve covers.
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Originally Posted by DONAIMIAN
The only rockers that I know of that require head mods are the Cranes. At the most the other will require clearencing of the valve covers.
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Originally Posted by DONAIMIAN
The only rockers that I know of that require head mods are the Cranes. At the most the other will require clearencing of the valve covers.
The Crane stud mounts drop right in except for the perimeter valve covers that require a few notches. When I looked into this all of the shaft mount adjustables required some head modifications. I went with the Cranes and they drop right in without modifying the heads or the valve covers.
So now you "need" adjustable rocker arms because the lifters are wrong. Maybe you should take a closer look at those lifters before blaming the rockers and pushrods for your problem. If you don't use pedestals(OEM, Scorpion) or shaft mounts(Jesel,Comp,Yella Terra, Harland Sharp) you'll have to buy new hardened pushrods which you were considering anyway. That's because the adjustable Comp Pro Mags you're considering use guide plates. The guide plates require hardened pushrods because the OEMs pushrods can't handle the scuffing from the guide plates. The Pro Mags are great. They have a much larger trunion bearing than most, but with the added cost of a new set of hardened pushrods you might consider some shaft mounts like the Jesels which don't require the purchase of new pushrods. It probably comes out to about the same cost. With the Pro Mags you'll find that you need to remove the thin aluminum oil baffle plates on the underside of the rocker covers(grind off rivets). With some brands of rockers cover spacers($300.00) may be required. That drives the price even higher. Let's see: rockers $500 or more, pushrods about $200 and spacers $300. You can do it for less, but I'd do a closer examination of those lifters just to be sure you really "need" new rockers before you pull out the plastic.
Originally Posted by eallanboggs
So now you "need" adjustable rocker arms because the lifters are wrong. Maybe you should take a closer look at those lifters before blaming the rockers and pushrods for your problem. If you don't use pedestals(OEM, Scorpion) or shaft mounts(Jesel,Comp,Yella Terra, Harland Sharp) you'll have to buy new hardened pushrods which you were considering anyway. That's because the adjustable Comp Pro Mags you're considering use guide plates. The guide plates require hardened pushrods because the OEMs pushrods can't handle the scuffing from the guide plates. The Pro Mags are great. They have a much larger trunion bearing than most, but with the added cost of a new set of hardened pushrods you might consider some shaft mounts like the Jesels which don't require the purchase of new pushrods. It probably comes out to about the same cost. With the Pro Mags you'll find that you need to remove the thin aluminum oil baffle plates on the underside of the rocker covers(grind off rivets). With some brands of rockers cover spacers($300.00) may be required. That drives the price even higher. Let's see: rockers $500 or more, pushrods about $200 and spacers $300. You can do it for less, but I'd do a closer examination of those lifters just to be sure you really "need" new rockers before you pull out the plastic.
I ordered the Crane golds today from Summit,they come with pushrods,guide plates,studs for a little over $700 Thanks for all the replies and i'll let you know how they work
Originally Posted by Silverhawk_02TA
Why adjustable rockers? With the correct length pushrod a hydraulic lifter is going to eliminate the need for an adjustable valvetrain.
