Rocketbrian

With a 71 G head with rotators and therefore deep spring pockets are there special longer springs for this application or do you have to shim each spring?

Octania

Use Rotators?

cutlassefi

Shallow spring pockets use a spring height of approx 1.670, deep pockets are around 1.800. Let me know if I can help.

Rocketbrian

I thought this would be a simple yes or no answer, with a little info on where to get them if it was an unusual item. The 442 in 71 has rotators on both intake and exhaust valves and therefore all deep seats, along with dampers and large intake valves. Surely someone has redone G heads.
Happy Thanksgiving to our southern neighbors.

67 Cutlass Freak

Exactly what do you need? I have a bunch of parts laying around here.

Rocketbrian

I just want to know when ordering valve springs are there different ones for shallow vs. deep seat heads? Some G heads have all deep or a combo of shallow and deep seats. I'm concerned about valve spring height. I'm thinking if they are sized for shallow seats then shims would be necessary under the springs in deep seat heads. I just want confirmation one way or the other. Thanks.

Rocketbrian

As a follow up perhaps if you keep with the rotators no shims would be necessary as the rotater obviously takes up the difference. I guess my question in hindsight is only applicable if one chooses to omit the rotators and go with retainers in a deep seat head. What's the feeling on omitting vs. keeping the rotators?

GOSFAST

Recently finished some "G" heads (409-100) with a final installed spring hgt of 1.900" with the factory length valves.

Spring pressure was 140# @ 1.900" with 340# open for a retro-hyd roller build. Made the 1.900" hgt easily.

This was all for a '71 "442", 455" 100% stock-appearing unit, roller rockers, stock valve covers.

(Add) There were no "rotators" used in the end product.

Thanks, Gary in N.Y.

P.S. Setup used all Comp components (I believe, have no numbers available here), dual springs, l/w tool-steel retainers, and 10* locks.

Rocketbrian

Thanks for the info and reply.