I'm sure this has been discussed before. How much power to be gained vs the added stress on the valvetrain.Will try my hand at heads up index racing, so it may not have to go as many rounds as a typical bracket car.Mostly 1/8 mile racing.
493 megablock,aluminum rods,ported Victor max wedge heads,weldup 2 1/8 headers,13 1/2-1 comp,plenum ported Victor /Dominator intake, 280/283 .690
lift Cam Motion roller. Would like to do it on the motor ,but will go with
150 horse nitrous,to make index,if necessary. What are your thoughts. Thanks, Bill.

Do you have enough spring to accommodate the added lift?

I guess that would be part of the question,as I have not yet purchased rockers, springs or pushrods.Trying not to build a valvetrain killer.I am considering Hughes cryo treated rockers,and possibly Comp conical springs and related retainers, hopefully avoiding rocker/retainer clearance problems.I'm trying to purchase effectively, one time,as financially I am really reaching to do this and would like feedback from all with experience here.All response welcomed and appreciated. Thanks,Bill

Those heads are somewhat installed height limited when using typical off the shelf parts.

You may want to look into that before making the final call on the rocker ratio.

I have Hughes' rockers on my Victors, but not w/ the cryo option. I don't know how that treatment is really supposed to help aluminum parts, considering all the benefits I've read about it seem to apply only to iron/steel parts. Maybe I haven't read the latest...

Originally I'd expected to be using a solid flat-tappet cam with them. However, the final build has a .650" solid roller w/ open spring pressures about 200# higher than what an SFT would use. It should be something of a durability test for my Hughes rockers to see how they hold up with street & track use given the current valve train.

If I made the decision to go w/ a solid roller from the start, I'd have thought seriously about budgeting for T&Ds.

I used a set of the Hughes 1.6 ratio Cyro treated rockers on my current bracket motor with the Eddy Victor M.W. heads, I had between 250 to 260 lbs. on the seats as and a little above 700 lbs. opened at .700 net lift with Manton series 5 3/8x.145 pushrods with a Bullet custom ground solid roller cam.
I had to switch out the adjusters after loosing several of them from not staying tight messing up the rocker arms and pushrod tips
I ended up switching all the adjusters to Manton Heat treated ones($13.00 each) and still had the same problems so I took those rockers off and put on a set of Harland Sharps roller rockers instead of the extruded aluminum like Hughes are and that ended up solving the problem with the adjusters loosening up and beating the rockers and pushrods up
Think twice or more and buy once , good luck on your build

have been using hughes 1.5 all season on .660 roller deal. so far no issues. 1.6 will move pushrods closer to shaft vs 1.5 and will probably need more clerancing in pushrod holes, they are real close with current 1.5 rockers. car went 12 6.15, 6.16 in a row 2 weekends back. victors for the win!

(Especially considering I know the clown from whom you bought the heads & rockers... )

I guess,then, what I'd like to know is how much am I leaving on the table if I retain the 1.6 rockers,in relation to power and 1/8 mile et.
Thanks , Bill

Are you trying to ask how much performance you're giving up if you run 1.5s instead of 1.6s?

The only way to KNOW costs time & $$$.

My OPINION, based on some rocker ratio testing I've done on less "serious" combinations, is somewhere between zero up to maybe 10 HP, and that's only if the combination is under-cammed. I don't think it is, which is why I wouldn't expect it to make much difference.

With a .690"-lift cam, you could also be right on the edge of using a spring that can handle the lift w/ 1.5s, but can't cover the additional lift of 1.6s. My PAC 1243 springs with a 1.90" installed height are good right up to .700", but trying to go with more lift would require a different spring that requires a taller installed height, too.

Every combo is different, but checking out AndyF’s rocker shootout on the TF heads might provide some food for thought/perspective.

First,thanks all for the thoughts you have on this.Iguess at this power level gains get smaller and costs with complications get bigger really quick. I am gonna go with the 1.5's and keep a less complicated valvetrain. Lenny from Ultimate Converters said I could probably get away with 100hp nitrous before I drive thru the 8inch converter.Sounds a lot more cost effective. Won't know until I try on that one.
Thanks again ,Bill

Don't mean to hi-jack but brad h these heads are everything I hoped for. I couldn't be happier with the performance. am looking to go with .750 lift cam over the winter and let this combo eat.