Rockers

[Anonymous]

Does anyone know if you can buy adjustable roller rockers?
Oh and what is a good pimary pipe size for extractors I have an of the shelf set at the mo But I dont think they are very good for making big power

 

[Anonymous]

Yes, i have a set of YT adjustables on my motor at the moment. I can find the Part # if you want. They are pricey though, i think around 600 for the set.

I think you can use rollors that are made for a clevo or something, might be easier to find a set of these at a swap meet or trading post etc.

I had to have the head machined for the studs etc.

cheers

simon

 

[Anonymous]

do I only need these if im running a soild cam J
I had to fit them to my old 208 that was fitted a solid

 

[TCSTEVE]

Tags281 was the head machining for the roller rockers expensive i'm looking at doing a set on my 2V head? Cheers Steve

 

[xctasy]

When we talk roller rockers, we have to decide if its cross-flows or pre-cross flows (down flow, as Backlash calls it!). If its pre-cross flow, you've gotta understand that there are four types. Aussie/US adjustables to 1963 (or 1969 in Oz), the 2V (non adjustable), and then the later US types, which have different rocker bar stud sizes. Just make sure the right info is being delt with. In any case, the stock roller rockers made by yella terra end up exported over there, and resold as American rockers in some instances.

I'll do a search. Jack noted that stud pull-out, (ye gods) is a problem with alloy heads. It's not an issue with the iron cross flow in XC's, 76-81 Transits, TE's and early XD's till mid 1980.

The trick is to just do the age old Clevleland HO 351 trick...machine the stock pedastols off, and add 7/16 studs. You don't have to use roller rockers if you are tight. The stock 351 HO gear could go to 6800 rpm without breaking. Roller rockers will save your exhast guides, and will be unlikely to break in service...ever!

See this link Posted: Sun Jun 01, 2003 5:03 am....http://fordsix.com/forum/viewtopic.php?t=5254

Ahhh. Late ammendment: YT has for $NZ 1000 a forth set of YT 6345's WHICH ARE SINGLE STUD 7/16, BUT HAVE A LOCATION DOWEL ON THE BASE!!!. No potential to turn around or mis-align. Jack, your question has been answered, and no gude plates, moly rods or stud girdle required!


Two out of three of the Yella Terra roller rockers for X-flows are true bolt ons! One, the big daddy hi-line one, isn't

Just got to make sure the stud doesn't loosen. A big lift cam with a sharp ramp and long duration might need some moly rods and guideplates. YT can advise. YT 5034 is a stock bolts on for about 500 ping, the YT 6018 is the same but adjustable, for an extra 100 bucks, and both use the stock stud. These may not like lifts over 480 thou at 5500 rpm or so, as they employ the stock5/16"( ~8 mm) stud which can pull out.

The giant killer(YT 5011), the 4V/Cobra Jet/HO/Phase III style 7/16(~11 mm) stud mount is really strong, but you must machine the 12 pads on the head to fit, and there needs to be a positive lock to stop it shifting. This is also provided by YT specifying ARE BARE MINIMUM of rocker studs,guide plates, hardnened push rods. The rockers alone are no more than the YT 5034, but all the extras cost big bickies. If you want your car to scream without firing a "dancing knitting needle", these are the items!

Jack noted Quote:
What I've found is that the stock pedestal is not that robust, so machining for studs leaves little meat for support if you drill and tap for a 7/16" stud base. Probably best to use a 3/8" stud and cut and weld 351C pushrod guides.


This has been are real issue for people trying to make a hi-po head out of stock 2V Windsors, 2V Clevelands, stock 429/460's. The 4V/Cobra Jet/Boss/Super Cobra Jet versions had much nicer castings which can take the bigger studs. There is no hi-po cast x-flow or alloy Honda Ford head, so were on our own. 3/8" studs (~9.5 mm) would be ideal, but they would need to fit the rocker designs. Chev guys designed the system, which was stollen from the Mark IV Mystery engine in 1965..I'm not sure if there exists a stud which is 3/8" based, shanked to suit the after market 7/16" roller rockers, yet doesn't loose strength.

 

[Anonymous]

I am not sure what it cost for that alone as i had the head recoed, ported and bigger valves in at the same time. I have a few pics of it before i put it on the car might see if i can post em up.