Various ratios available, catering for every camshaft grind.Proven bolt-on shaft mount design that mounts both inlet/exhaust to common shaft, effectively increasing footprint and clamp load twofold without any further cylinder head modification.Extruded from aircraft grade aluminium, perfect for dissipating excess top-end heat.Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine.Oversize full-complement caged bearings designed for oscillating (rocking) loads, paired with oversize precision ground trunnions to reduce friction.Built to withstand 600lbs* max open spring pressure.Ideal for harsh street and strip applications, these rockers have got what it takes to last! Our wide range of true ratios allows you to achieve high lift without relying solely on your camshaft… a trend many engine builders and racers alike are adopting to relieve the inertia on lifters and pushrods generated by aggressive and often violent ramp rates required to make big lift. Manufactured and assembled in Australia using the highest quality materials and componentry consistent with those found in our Platinum race series. No other comparable product can compete with 600lbs* maximum open spring pressure whilst retaining factory size bolt-down hardware. i love the way mine runs and would not change a thing.Designed for high revving street/strip applications.
#YELLA TERRA ROCKERS YT 6628 MODS#
anyways these mods gain some in hp and some in torque but i think overall they give more life to the engine, better throttle repsonse and an overall better feel to the 4.0. if i were to take the money i have in it on all the bolt ons added up i could about stroke it ( i have bought and sold some stuff so overall) which i would do next on my next cherokee build with a new header and exhaust even before lifting it or anything.
i run synthetic castrol syntec for the last 50k, k and n oil filter with a stp oil additive or lucas every 3k, use fuel injector clean or acetone on regular basis like every 30 gallons and just had a compression test and the motor runs like a top. With this all together with the chip i love the feel of my engine - i get great torque on the trails, i have gotten it to run cool now - 3 core radiator, hood spacers, hood vents - and the HP is fine for my 35's and 4.56 gears - it is not a big 350 or 454 but it is reliable, fuel efficent (not great but ok for me for a few times a week driving), sounds great and gets me where i need to go. K and n fipk intake, rustys tb spacer, banks header, unkinked downpipe - 2.5 to hi flow magnaflow cat to 2.5 flowmaster 40 series, bored stock tb to port match intake at 60mm, screamin deamon ignition upgrade, stock champion plugs, optima battery, I have a jet stage 1 chip on my 99 which helped my throttle response - thats about it but also i have done:
#YELLA TERRA ROCKERS YT 6628 MOD#
It's a $50 mod so you can't expect much, but it'll yield a small HP/TQ gain and you may see a small improvement in gas mileage. Some JET chips cause problems so best avoid them altogether. Small gain in HP at top end but you lose a little torque in the midrange. I like my Borla header for the improvement it made to the sound so for that reason alone, I think it's a worthwhile mod.ģ. Header: Not much of a gain by itself but works much better in conjunction with mandrel-bent downpipe, high-flow cat, and performance catback. They also look a lot sexier than the stock stamped steel rockers and I have them in my 4.6 stroker.Ģ. Do them for engine reliability, not for performance. Yella Terra 1.6 ratio roller rockers: More stable, quieter valvetrain (no more pesky rocker ticking) but HP/TQ gains minimal. I'll give you my own first hand experience of these mods.ġ. Do any of these do any good, or are they just a waste of money? Or something like headers, a performence chip, or a throttle body spacer. Does anyone know how big of an increase in power would a person would get if they bolted on a set of aluminum roller rockers.