Educate me on 5.9 Magnum Roller Rockers

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Scottd9990

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I am interested in Roller Rockers for my 5.9 Magnum engine (1999) I have a mild build with EQ Heads, Comp Cam (506 lift) Airgap intake, Dougs Headers! Educate me on best roller rockers for Magnum 5.9. I see the Hughes Engines sets. Pretty Expensive!! Looking best bang for buck.

Scott
 
If your OE are in good condition you can use those.
I think the ones I got were Melling brand not sure though.
 
Unless you are looking to increase the ratio, I'd spend your money elsewhere. If you are at .506 lift with your cam now, and should be 1.6's with the magnums, going to 1.7's might require some work on the heads to accommodate the higher lift of .537.
 
Unless you are looking to increase the ratio, I'd spend your money elsewhere. If you are at .506 lift with your cam now, and should be 1.6's with the magnums, going to 1.7's might require some work on the heads to accommodate the higher lift of .537.


Not really looking to go more lift, just less friction. Already using roller cam (Comp) and 1.6 ratio rockers (Stock) which work very well up to 6200 or so. Just looking to free up some extra HP if I go roller rockers. Yes? No? Also looking at possible E85 conversion. I heard from local Drag guys they are getting 30-40 RW HP jumps on E85.

My combo works great, but looking for a bit of an edge for next season racing SCCA CAM Class.
 
The ones from Hughes are the best, IMO. Just look at them. That's all it should take.
 
hughes makes a very nice set that converts to a shaft style rocker.....but a 3/8 stud small block chevy rocker will work on a magnum. A stud 5/16 conversion to 3/8 stud is used....then pick your favorite brand of rocker...aluminum or stainless
 
I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

image.jpg
 
I'm running Harland Sharp 1.7 ratio rollers on my 360 mag.
 
I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

View attachment 1715120162

My cam is close to yours so think I will stay with
1.6 rockers. Still have not decided yet.
 
Lift is not what you need to be concerned with as far as piston to valve clearance. It's the duration. It's not the how much, but when the valve is open. If you have clearance with the 1.5 you will have clearance with 1.65.

I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

View attachment 1715120162
 
I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

View attachment 1715120162
I know this is an old thread, but I was looking for info on some roller rockers when I came across this. I placed an order to Hughes Engines on 3/27/23, to the tune of about $2500. It included, among other parts, a cam, a tuner...and an Airgap intake kit and their premium rocker set. The intake took about 2 months for them to finally get in stock. Whenever I would call to ask about the rockers, they would say they were "waiting for parts from the supplier". Finally I got tired of waiting, and asked if they could at least send the ENTIRE REST OF THE ORDER, and just send the rockers when they got the parts. I received the order about 2 months ago. Dave Hughes finally called me 3 nights ago (10/26/23), only to tell me that the parts had cost more to have manufactured than he was advertising them for. I paid $760, they had my money for 7 MONTHS, and he gave me the option to pay the difference toward the NEW price - $1300 - or he would refund my money. No offer to cut me a break, or a deal on parts in a future order...not even an apology. Just pay the difference or get my money back. I'm probably gonna go with Harland Sharp rocker arms...they're less expensive, and probably as good or BETTER than the Hughes parts. On top of being a shady business to deal with, Dave Hughes is condescending and rude, and will never get another penny from me.
 
I know this is an old thread, but I was looking for info on some roller rockers when I came across this. I placed an order to Hughes Engines on 3/27/23, to the tune of about $2500. It included, among other parts, a cam, a tuner...and an Airgap intake kit and their premium rocker set. The intake took about 2 months for them to finally get in stock. Whenever I would call to ask about the rockers, they would say they were "waiting for parts from the supplier". Finally I got tired of waiting, and asked if they could at least send the ENTIRE REST OF THE ORDER, and just send the rockers when they got the parts. I received the order about 2 months ago. Dave Hughes finally called me 3 nights ago (10/26/23), only to tell me that the parts had cost more to have manufactured than he was advertising them for. I paid $760, they had my money for 7 MONTHS, and he gave me the option to pay the difference toward the NEW price - $1300 - or he would refund my money. No offer to cut me a break, or a deal on parts in a future order...not even an apology. Just pay the difference or get my money back. I'm probably gonna go with Harland Sharp rocker arms...they're less expensive, and probably as good or BETTER than the Hughes parts. On top of being a shady business to deal with, Dave Hughes is condescending and rude, and will never get another penny from me.
I received the same call. Can't justify in my mind to pay that much of a price increase.
 
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