Erson Roller Rocker Assembly Backordered

[cobrajam]

For what it is worth, I ran Ford Power Parts roller rockers in my iron 427. The POPs are very similar, and may very well be the one and the same. I preferred the FPP rockers over the Doves because the FPPs have a bronze bushing (like the POPs) instead of the aluminum riding on the shafts like the Doves. I also liked the ball/ball ends of the push rods that were used. I did use the Dove stands/shafts due to the fact the end stands actually tied into the head studs. This was about 15 years ago and choices were more limited back them. I was using a solid Comp Cam roller, .645/.645, 246/246@50, 108 LSA, and either Comp 829 or 839 springs . I ran it up to 6500 rpm on several occasions (as in as much as possible) w/o breakage.

I initially was going to strip everything off my iron 427 to build my aluminum one, and was going to reuse the rocker assembly, but at some point I decided to keep them with the iron block and build it too. That, and the fact I will be running around 650lbs open pressure springs w/ a Comp solid roller .739/.751, 276/286@50, 108 LSA, I opted for the Ersons because of the advertised rating of 1200lbs, plus at $700 set, they were $200 less than the pieces I put together over a decade ago.

IMO the key to keeping your rocker assemblies alive, esp with your cam and related spring pressures, will be keeping the shafts from flexing/breaking. Even though the Ersons have a smaller diameter shaft, they do have the end stands that wrap around the end rocker, where the shaft typically breaks.

As stated before, DSC has a couple again on ebay where I got mine. I noticed he took off his typical Buy It Now price, I guess it is [i]whatever the market will bear[i] now.
http://cgi.ebay.com/ebaymotors/ws/eB...015593492&rd=1
http://cgi.ebay.com/ebaymotors/ws/eB...211227996&rd=1

[767Jockey]

Originally Posted by cobrajam

For what it is worth, I ran Ford Power Parts roller rockers in my iron 427. The POPs are very similar, and may very well be the one and the same. I preferred the FPP rockers over the Doves because the FPPs have a bronze bushing (like the POPs) instead of the aluminum riding on the shafts like the Doves. I also liked the ball/ball ends of the push rods that were used. I did use the Dove stands/shafts due to the fact the end stands actually tied into the head studs. This was about 15 years ago and choices were more limited back them. I was using a solid Comp Cam roller, .645/.645, 246/246@50, 108 LSA, and either Comp 829 or 839 springs . I ran it up to 6500 rpm on several occasions (as in as much as possible) w/o breakage.

I initially was going to strip everything off my iron 427 to build my aluminum one, and was going to reuse the rocker assembly, but at some point I decided to keep them with the iron block and build it too. That, and the fact I will be running around 650lbs open pressure springs w/ a Comp solid roller .739/.751, 276/286@50, 108 LSA, I opted for the Ersons because of the advertised rating of 1200lbs, plus at $700 set, they were $200 less than the pieces I put together over a decade ago.

IMO the key to keeping your rocker assemblies alive, esp with your cam and related spring pressures, will be keeping the shafts from flexing/breaking. Even though the Ersons have a smaller diameter shaft, they do have the end stands that wrap around the end rocker, where the shaft typically breaks.

As stated before, DSC has a couple again on ebay where I got mine. I noticed he took off his typical Buy It Now price, I guess it is [i]whatever the market will bear[i] now.
http://cgi.ebay.com/ebaymotors/ws/eB...015593492&rd=1
http://cgi.ebay.com/ebaymotors/ws/eB...211227996&rd=1

No "Buy It Now" choice, but there is a reserve price, which at $510 and $503 has not yet been met. My guess is reserve is about what the "Buy It Now" price was. Can't say that I blame him.

[afret]

That, and the fact I will be running around 650lbs open pressure springs w/ a Comp solid roller .739/.751, 276/286@50, 108 LSA, I opted for the Ersons because of the advertised rating of 1200lbs, plus at $700 set, they were $200 less than the pieces I put together over a decade ago.

IMO the key to keeping your rocker assemblies alive, esp with your cam and related spring pressures, will be keeping the shafts from flexing/breaking. Even though the Ersons have a smaller diameter shaft, they do have the end stands that wrap around the end rocker, where the shaft typically breaks.

One thing you might consider is the strength of the helicoils in the rocker stand bolt holes in aluminum heads if you are running Edelbrocks. I know there are guys running 650 lb valve springs with the helicoils but I think there are cases of the helicoils getting pulled out with springs this strong. You might ask KC for his opinion. I took out the helicoils on the 2 sets of Edelbrocks I have with roller cam springs and replaced them with larger solid inserts (Ez-loks) for peace of mind. One is about 600 lbs open and the other is about 650 lbs open. Actually any more than this and T+D is the way to go.

The small diameter shaft in the Ersons is kind of worrisome. I have a couple sets of the Ersons and when I start installing them, the shaft flexes a lot more than with the setup I had with the thick chomoly shafts and endstands. Gives me a bit of a scare. I can't see how they can be stronger than the setup with the good shafts and endstands. I think the Erson shafts are only about 5/8 inch diameter compared to around .8 or so for the other shafts. The rockers themselves may be stronger than say the Harland Sharps, etc but there is no way a much smaller diameter shaft can be stronger especially when you have the large holes in the shaft for the rocker stand bolts. I'm not anti Erson since I do own them but the shaft itself seems to be the weak point in the system. I recall RobbMc who designed the system mentioned that shafts have broken but the stands capture it so you might not even know of the break. I don't remember hearing of too many cases of the POP chromoly shafts breaking if using endstands. I'm no engineer. JMHO