Badmoonrisn

I have an opportunity to install a new set of Crane aluminum 1.6 ratio roller rockers on my LT1, has anyone done this upgrade, have any interference issues,etc... let me know your thoughts.

jaa1992

The rockers may hit the oil drip tabs on the valve covers.
Just break them off - do a search if you are nervous about this.
I managed to get a small dremel cut off wheel in there and scored them where I wanted to break them off.

Polo Vert

I have considered doing this but haven't done it yet. From what info I gathered most guys recommend changing the valve springs when doing this.

8a8mfh

I put the cheaper Comp Magnum 1.6 rockers on my '93 LT1. My composite/plastic valve covers didn't have any kind of drip rails.

Make sure you get self aligning rockers unless you plan to or already had guide plates installed.

Jonnymac

Easy job. I use the crane gold but you might want to upgrade your valve springs while your at it. Not so easy of a job.

John A. Marker

Nothing to support this....but I have also heard that the stock springs will not stand up to the change to a 1.6 RR. The suggestions were to always upgrade the springs when you change.

johnnymo63

I did this upgrade and it's well worth the effort.
1. You do need self-aligning rockers.
2. You do need to trim or cut off the drip tabs inside the valve covers.
3. You should upgrade your valve springs to the LT4 springs. (only around $50)
4. New valve cover gaskets needed and I used the sealer called "The Right Stuff", available at Autozone.
5. Throw on a set of long-tube headers and get a dyno tune and you'll be smilin".

70ZZ3 96LT4

How much horsepower are you going to gain with the 1.6's?

THE 383 admiral

This is a easy quick & slight gain in performance.
1st what is your mileage. 1.6 RR will give you apprx .30 extra lift. Enough to stress out old springs. The LT4 beehives will help with the OE small lift, lower pressure seats.

DrDyno

I've got Scorpion 1.6, self-aligning Rollers... bought them from Summit Racing. Also, I swapped out the stock valve springs for LT4's for two reasons: they're oblong so they won't bind (lower height) and, they're good for another couple of hundred RPM. Changing out the valve springs just requires some compressed air and a spark plug hole air inlet. And, someone who knows what they're doing. Most decent, SBC mechanics should be familiar with the process.

The difference was noticeable... immediately! GREAT mod for the LT1! I haven't added headers, I did, however, go for muffler eliminators to free up the exhaust flow. I also don't think the expense of a Dyno Tune is necessary. A decent Street Tune to set the AFR's, the shift RPM and reset the cooling fan parameters served me well.

One thing you'll probably notice is the valve train is a little noisier. It's normal with the 1.6 roller rocker upgrade.

Have fun... It's well worth the effort.

chevy4x4vt

are you running stock valve covers? did you have to do any mods to valve covers to make the RRs fit?

DrDyno

Yes, stock valve covers and, like Johnnymo63 said, above: "2. You do need to trim or cut off the drip tabs inside the valve covers." ...a simple process.

Here's a thread you should check out...
https://www.corvetteforum.com/forums...ra-advice.html