So with so many members that bought Speedmaster heads what rockers are u guys/gals running. The cam has .502 lift hyd flat tappet. if u want to know more about the rest of the build check out my 340 upgrade thread. Thanks. Kim
Rocker arms for Speedmaster LA heads
- Thread starter oldkimmer
- Start date
-
dano
Evil Handy Man
My heads were built from raw castings. Comp Magnums (not the Ultra Pro Magnums) didn't line up well, Got a kit from B3 to get it right but it moved the push rod so much I was hitting the tunnel, and even after opening them up it still was too close. Next I tried Hughes aluminum rockers, I don't recall if I needed a shim under the shafts or not but they fell in far better than the Comps Magnums. As you know results may vary with where the valve stem heights were set to.
Wyrmrider
Well-Known Member
u can run stock rockers
or iron
roller tip really need B3industries kit go to website and read all 4 tech articles and you can ask him about choices/ tradeoffs and get a straight shot answer
I also contact rocker arm specialists in anderson ca
cheers
do a search
or iron
roller tip really need B3industries kit go to website and read all 4 tech articles and you can ask him about choices/ tradeoffs and get a straight shot answer
I also contact rocker arm specialists in anderson ca
cheers
do a search
He actually wants to the run stock rockers. I will try them first to make him happy to see where they sit. I already told him we will need to change the rockers as I think 300 lbs spring pressure will be too much. These are the HD 340 rockers. Kim
dano
Evil Handy Man
Yeah you don't know until you put them on and check. That goes for any make of engine with rockers. Guide plates and rocker studs make for a whole different fun game of geometry, especially with compound angle push rods..
Kim, maybe you can talk him into adjustable ductile iron OEM rockers. Bill
Bill, well I hope at least them or some other adj iron.Kim
Wyrmrider
Well-Known Member
new rockers? new shafts
used are they going back where they came off?
inspect all the cups, any wear pitch them especially if new or mismatched pushrods
we had to run that much pressure with stock rockers can be done
put rev lube on the bottom of the rockers when installing
run oil through the pushrods will help pushrod cup wear and push thrpughs
btw run the stiffest pushrods you can fit
how much additional lift over stock- .050? you should be ok maybe shim shafts like .025-- gotta check
talk to rocker arm specialists about iron, bronze bushed iron etc if you go that route
used are they going back where they came off?
inspect all the cups, any wear pitch them especially if new or mismatched pushrods
we had to run that much pressure with stock rockers can be done
put rev lube on the bottom of the rockers when installing
run oil through the pushrods will help pushrod cup wear and push thrpughs
btw run the stiffest pushrods you can fit
how much additional lift over stock- .050? you should be ok maybe shim shafts like .025-- gotta check
talk to rocker arm specialists about iron, bronze bushed iron etc if you go that route
MOPAROFFICIAL
Oogliboogli
What did the stem height come out to?
The comps are designed around a production head with a stem height between 1.907-1.937 iirr.
The comps are designed around a production head with a stem height between 1.907-1.937 iirr.
I’m not sure as we didn’t measure that way. We used this factory tool to measure the high and low minimum height that Chrysler calls for from the spring pocket to the top of the valve. Kim
Miller Gauge range is 2.100- 2.125, favoring the short end of the scale with a +100 SBC valve of 5.010", tip of valve to aluminum surface of the head.
-
