Which Rockers

[Aussie Challenger]

I have been reading that the standard rockers on the SB LA's are supposed to be 1.5:1 but are around 1.3:1, the couple I checked on my 360 are under 1.5:1. Do any of the replacement rockers stamped steel or otherwise offered for sale come close to what they are supposed to be? I know that expensive rollers usually are, were the 273 cast adjustable or their replacements come close, has anybody got any info to add. It is a little harder from over here in Aussie to follow up on these things and won't be going over for a while yet.   

[femtnmax]

I have Comp Cam magnum roller rockers on my 360 magnum.  Yes they cost $$, but the ratio was actually a little more than advertised, not less like you mention typical of OEM.
I believe you are correct that $$ aftermarket will be more likely to have the correct ratio. 
Could you buy a couple of TRW replacement rockers (budget price) and check out the ratio.  The last set I bought seemed well made, but I did not check out the actual ratio.
Keep in mind the small block mopar has the foolish lifter angle issue, such that the lifter rise is not what the rocker arm sees; some lift is lost due to the lifter centerline not being in line with the pushrod centerline.  Thats where IMO getting correct rocker arm ratio such as your striving for, or increasing the ratio can only help offset the lift loss due to the lifter angle.

[vinb]

Most ratio's on the stock stamped steel one's are 1.41 to 1.44. The 273's are right around 1.43 to 1.45..

I do have the Comp Pro Magnums and never checked them, but they say they suppose to be 1.50.

I will check those over the winter after taking the engine out..

[Aussie Challenger]

Thanks for the replies so far. It is important to get the ratio right or as mentioned the lifter angle plus less ratio then the valves don't open as quick or lift as high as they should. I am thinking of going to the 1.6:1 but was exploring all options, I don't really want to go to the expense of rollers but may just have to.   

[nqkjw]

Do std BB rockers have the same less-than-supposed-to-be ratio issue?

[Aussie Challenger]

Do std BB rockers have the same less-than-supposed-to-be ratio issue?

Ken I was thinking originally of including the BB rockers, the stamped ones I would suspect are as bad as the SB ones, massed produced and very little quality inspection unfortunately.   
It's a shame because the stamped rockers do a reasonable job in std to mild performance motors but you don't get the full benefit of the cam.   

[Aussie Challenger]

I was just looking on Summit & Manicini sites at the Harland Sharp roller rockers, Summit appear to include the shafts and Manicini sell the shafts as extras, are the shafts needed? (supposed to be hardened) I don't trust Summit as they use some parts and infer that all shown parts are standard.
Has anybody used Hughes rollers? I have heard that some Aluminium rockers are prone to cracking except Harland Sharp. Any comments?   

[Chryco Psycho]

the big block rockers are off as well with the accuracy of the rockers
 I use the cast stainless rockers over any of the alum or needle brg rockers

[Aussie Challenger]

I had a look on the Harland Sharp site and they say that you have to use .100" - .150" longer valves to get the right angles. Do these fit under MP cast R/C or do you need taller covers?
Rollers might be good but come with a lot of extra expense, are there any stamped rockers made that are at the 1.5 or 1.5 ratio?

[Chryco Psycho]

no stamped rockers are exactly correct ratio
 look at the PRW or Comp steel rockers