mixtape

Hey guys, time for 1.6RRs to accompany the Crane 227 cam and 10309-1 kit going onto my Impala SS motor (time to replace the stock Z28 motor, see video). I was planning on going with Crane Golds since they've been proven with a great rep by many users, but I've also heard fantastic things about these newer style Ultra Pro RRs. Especially the fact that the Ultra Pros are supposed to be super quiet.

So are those Comp Ultra Pro Mags (1605-16) self aligning? I was looking into the Crane Gold (10758-16) RRs at first, but changed my mind when I heard about the Ultras. and then when I was considering getting the Ultras, I heard that the Ultras were not SA while the Crane Golds were. So it's been back and forth . I would really prefer to stay away from NSA since it adds more complexity to the mix.

For what it's worth, I will most likely run the iron head from an Impala SS LT1 for a year while I save up for Lloyd Elliot heads. My stock z28 motor is in pretty bad shape (see video), so I'm probably not swapping over any questionable parts to my Impala long block. Even though I could save a good amount of weight doing so. Just not worth the risk.

Any help is appreciated! I want to buy RRs this weekend.

Here's a video of the stock engine. Don't worry, the Impala SS long block is in the garage getting a cam, valve springs, and 1.6RRs . This Camaro is far from retirement .
http://www.youtube.com/watch?v=mrSsxY8pZso

95sscamaro

iTrader: (6)

Comp Ultra Pro Mags

food nd cars

Yes the ultra pro mags are SA. I am about to install a batch this week.

mixtape

Thanks guys

Do you happen to have the part number for the Ultra Pro Mags you have? I checked the Summit website and compared the two here. I put a red circle around the areas that I'm confused about.

Thanks again for all the help!

shbox

The above Comps won't work for two reasons:
-not self-aligniing
-not for 3/8" stud

NSA or SA depends on which you order. Look into the 1618-16 for SA 3/8. However, if you are going to do LE heads later, you might have wished you got rockers for 7/16" studs and NSA (but they aren't going to work on the Impy heads). I also have not heard that the UltraPro Mags were really any quieter than the Pro Mags.

mixtape

Hey, thanks! Awesome info. I saw the 1618-16's on the Comp website actually, but they're rated at 1.52 instead of the 1.6 of the 1605-16 kit. I mean 1.52RRs are better than what's on the motor now (stock), but I don't think it'll beat the Golds and their 1.6 ratio spec.

As bad as it sounds, I rather cut corners now and use the 3/8", instead of swapping over the questionable aluminum head I have and going 7/16". Last thing I want is to transfer over my headaches lol. Plus I can always sell the RRs I get this week for something else next year when I do decide to go LE.

food nd cars

http://www.summitracing.com/parts/CCA-1618-16/

These will work fine with your future LE setup

shbox

There is apparently some mixup. Everybody but Comp says they are 1.6 ratio.

quik95lt1

iTrader: (7)

i ran those crane's on my HR 355 for a long time.........awesome rocker!!!!!!! never had any issues with them at all..........the comp is a good offering as well but for your applicaiton like shbox said the comp wont work your ticket is the cranes

defaultexistence

iTrader: (11)

i have the SA golds on my DD, they are quiet ,3/8 ,no probs for 6months so far ...running at zero lash and 3/4 turn

Gojira94

iTrader: (4)

I love my UPMs. The 1605-16s are not self-aligning. However, guide plates are cheap and not hard to incorporate. 7/16" studs are also relatively inexpensive. Figure an extra $100-120.00 to do guide plates and some ARP or Comp 7/16 studs with a guide plate locator shank. When doing guide plates, it's important to choose a stud that has enough length to get past the thickness of the guide plate into the head. IIRC, I used the Comp 4512-16 studs. They're 1.9" long overall and specified for BBC. The base threads in LT1 heads are 7/16" & 14 thread pitch, even on the stock studs. Only the part that sticks up is reduced to 3/8" on a stock offering. So 7/16" with a little extra on the bottom (.15") is about right to secire the stud in the head past the guide plate.

I can hear my UPMs at cruising speeds. Sounds like a faint sewing machine noise. I'm using them with 875-16 lifters (Type 'R'). They're 1/8-1/4 turn past zero lash and transfer energy to the valve train very well. Also using Magnum pushrods (about $85.00). My measurement was nearly perfect 7.2" with very light resurfacing on the heads and a .040" gasket so I just threw stock length 7.2" in it. Very happy with the way it came out. I used Comp 4800-8 raised plates, but flat is fine, too. For the relatively small extra expense, it's worth pursuing a NSA setup.

EDIT: re-reading SHBox's post, I did not realize that Impala heads are not 7/16" base thread. My mistake. I thought all LT1 heads, Aluminum and iron alike had 7/16" 14 pitch base threads...

shbox

The cast iron head have pressed in 3/8" studs. Machine work is required to go to screw in studs.

nitrous2fast

iTrader: (2)

Comp has them in 1.52 ratios as well as 1.6 ratio...

shbox

I know that, but the confusion is the same part number is listed as both 1.52 and 1.6.

jlpz

iTrader: (8)

I have the 1.6 ratio Ultra pro mags waiting to go on...nice part imo very well made. I went with the 1618 part number listed. I went with self align because I wanted to less of a hassle..

RamAir95TA

iTrader: (2)

Been running the same Crane Gold 1.6 / 7/16" rockers for 7 years now...

BizZzatch350

iTrader: (33)

I have the Crane Golds on mine, they were in a car before me and worked fine in that car, work fine on my TA.

mixtape

Thank you guys for all the great input! They both seem like great choices where I can't really go wrong either way. However, I found a deal on the Crane Golds (10758-16) for $280 shipped. They were apparently used for only a few hours before the guy's Suburban engine blew due to bad machine shop work (tough deal ).

I find it strange that Comp did this. I'm sure it was in error, but that's a pretty noticeable error not to catch lol.

Lastly, I think shbox mentioned that machine work would be required to run the Ultra Pro Mags on an iron head, but will the Crane Golds also require machine work? As in, do the Ultra Pros and Golds both need machining to work on iron heads?

Sorry if I'm wording it poorly, but basically, if the iron heads have pressed in rocker studs, will the Crane Golds (10758-16) need any machining to work on the Impala head?

Thanks guy!

shbox

It takes machining to convert to screw in studs on an iron head is what I was saying. If you want to run 3/8" stud rockers (Crane or Comp), you just slap them on (with springs that support them, of course).

mixtape

Ohh, I misread. Glad to hear that! I was hoping not to have to machine the iron heads as that would greatly eat up my budget for the repairs. Thank you!