Roller Rocker for a "Mild" Street Stroked 427?

[Barry_R]

Ford used aluminum rockers from Crane in Cobra Mustangs as an OE installation.  They must have passed some significant long term durability testing to get the OK for that usage.  On hydraulic spring pressure and rational lift builds I do not think aluminum will be a problem at all.  I will agree on the T&D stuff being extremely high quality.

[ACHiPo]

Finally got around to contacting T&D.  They recommend their steel rockers for street use--an extra $500.

 Unless you lack confidence in your engine builder, I would let them make the call on the rocker arms. They may or may not be in agreement with what you decide. With that being said, if you knew how many hundreds of FEs are out there running on the street with T&D aluminum street Rockers, you wouldn't be second-guessing the durability.  They have good parts.

This is more about feeding my OCD than trust in the builder--I'm chompin' at the bit to something, even if it's just picking out components that may never get put into my motor.

[ACHiPo]

Finally got around to contacting T&D.  They recommend their steel rockers for street use--an extra $500.

So I seen the "an extra $500".
Well I must look that up.
I go to the T&D Machine Products site. Love that spiderweb.
They are not giving up the price there, but they do give out tech.
It say's that the stock type are 1.60 and the Blue Thunder Thor, 1-piece Stand    
1.650.
Is this true?
I have never measured a T&D rocker.
That's giving up a lot of cam if it is the case.
Most are measured at least 1.73 stock.

http://tdmach.com/bbf.html

They are 1.76:1, and I was wrong about pricing.  The Edelbrock kit is $1176 and the steel rocker option adds another $608.  I really like the idea of roller rockers, but for my cam and build, $1800 just seems crazy.  Ultimately I'll let my engine builder decide--like I said I'm just enjoying learning and figuring this stuff out on my own.

[ScotiaFE]

They are 1.76:1, and I was wrong about pricing. 

How would you know, you don't own a set so how would you have measured them.

[blykins]

They are 1.76:1 and the race rockers are available in different/custom ratios.  Of course there's a tolerance to everything, but I don't know where all this 1.6-1.65 stuff came from. 

[machoneman]

So, Brent, Barry, Jaym, etc......do you think if someone made these T&D style of NASCAR rocker for the FE, would they add significant RPM capability?

http://picclick.ca/NASCAR-TD-Roller-Rocker-Arms-220-Ratio-Chevy-311582161065.html

[ScotiaFE]

They are 1.76:1 and the race rockers are available in different/custom ratios.  Of course there's a tolerance to everything, but I don't know where all this 1.6-1.65 stuff came from.

From T&D web site. Must be true if it's says so on there web site.

http://tdmach.com/bbf.html

[blykins]

Yes I do.  They are super light without a big body and an adjuster hanging off the back. 

My buddy had an older RCR engine go through his shop for a freshen up, used as a dirt track engine.  It had an .800" solid roller in it.  Of course it had small titanium valves, but the spring pressures were only 180 seat and 450-475 open, using $1000 PSI valve springs.  Engine peaked at about 8000 rpm.  I attribute the low spring pressures/high rpm to the fact that the valvetrain was super light as it used the rocker arms that you linked us to. 

A rocker that's missing that adjuster is going to be much lighter. 

I have had factory non-adjustables to 6500 with hydraulic rollers on the dyno.  That's pretty difficult with a typical rocker arm with adjusters. 

A T&D setup like the one linked would be really nice for an FE....strength and light-weight.  However, it takes a lot of effort on the builder's part as pushrod length needs to be *carefully* measured, especially with a solid cam.  No adjusters, so no way to adjust lash/preload.

I really like the factory non-adjustable rockers.  Hard to talk some guys into it though, as a $350 rocker arm setup that looks like it was just pulled off of a '64 Galaxie doesn't look right on a $18k engine. 

[blykins]

They are 1.76:1 and the race rockers are available in different/custom ratios.  Of course there's a tolerance to everything, but I don't know where all this 1.6-1.65 stuff came from.

From T&D web site. Must be true if it's says so on there web site.

http://tdmach.com/bbf.html

That's the rocker arm length...............not ratio.

[ScotiaFE]

They are 1.76:1 and the race rockers are available in different/custom ratios.  Of course there's a tolerance to everything, but I don't know where all this 1.6-1.65 stuff came from.

From T&D web site. Must be true if it's says so on there web site.

http://tdmach.com/bbf.html

That's the rocker arm length...............not ratio.

Huh
The rocker is 1.6" long? Which part?

[blykins]

Center to center of rollers.  That dimension helps determine what kind of spring you can put underneath it.   The dimension from the fulcrum to the pushrod cup dictates the rocker ratio.

Their street rockers are 1.76:1. 

[bn69stang]

Buy the T @ D s , and be done with it ..very nice part and to me you making an investment on a part that you will have around for a long time .. Never cut corners on your build , Bud

[blykins]

[ACHiPo]

They are 1.76:1, and I was wrong about pricing. 

How would you know, you don't own a set so how would you have measured them.

Scotia,
I only know what the tech emailed me--they are 1.76:1 and I was wrong about the pricing.
AC

[ScotiaFE]

Is the cheap vernier broken?
You are measuring a race rocker and it only reads 1.60.
The race rockers are 1.65.
Exactly how does this measurement tell you how much spring you can use?
"That dimension helps determine what kind of spring you can put underneath it. " your words