Speedmaster 1.6 rockers

[gtxrt]

Speaking of experiments, do you think there is any advantage with 1.6's given the mild cam? I don't need to spend extra money on top of the heads if I won't see any gains.

going up 25 thousands lift on a cam is a big deal. lift gives you better bottom end plus better top end really the whole power curve with no down side.

 

[70rrclone]

The cheap stainless rockers I've heard of issues w the pin sliding out of the roller.
I would avoid anything made by Speedmaster, not worth it. Never any engineering...only the cheapest copy they can offer.

Looks like the pins are riveted. Not sure how they used to be done. Not sure im going to run these.

 

[gtxrt]

how do these look ? on ebay. they have better ends on the roller tips than in post 22#. item #405979673615

 

[70rrclone]

Looks a lot like the speedmaster set.

 

[PRHeads]

Speaking of experiments, do you think there is any advantage with 1.6's given the mild cam? I don't need to spend extra money on top of the heads if I won't see any gains.

I think the cam is so mild that anything you do to increase the velocities at the valves will pay off.
How much? Only one way to know for sure, but I wouldn’t expect miracles.

If you’re buying rockers anyway, the 1.6’s are a free upgrade.

Keep in mind that running 1.6+ rockers on E heads often requires relieving the intake pushrod tunnels.

As a general rule, I try and avoid Chinese valvetrain parts.

 

[gtxdana]

found the box mine were prw rockers

Are PRW's better quality? They look similar.

There are a few of the CompCams Pro Magnum style rocker knockoffs out there. The really cheap Speedmaster/E-Bay ones are pretty sketchy. The PRW PQx series are a couple hundred bucks less than the Comp and HS, but they actually look pretty good. Bushed, shafts are thick with the oil holes in the right place, axle retention looks the same as Comps, valve stem contact was actually pretty good out of the box with no correction on a set of 440 Source heads. Accurate 1.5 ratio, maybe slightly better as I recall. Can't comment on how long they'll last since I don't have the car together yet.

 

[1KoolBee]

Speaking of experiments, do you think there is any advantage with 1.6's given the mild cam? I don't need to spend extra money on top of the heads if I won't see any gains.

More a question of how much flow will you pick up with 1.6s. With some heads, there’s no noticeable difference.

 

[qkcuda]

This is my theory only, but since the heads flow 256 at .400 lift, 278 at .500 lift, and 291 at .600 lift, increasing total lift from .444/.466 to .475/.500 should make more of a difference than say increasing from .550 lift to .600 since flow tapers off.