I have the 10308-1 kit and I am going to get them installed this week. After reading this thread, I am a little nervous. I have the Crane 1.6 rockers on already and they were previously "milled". Should I really worry about the seats or am I alright?

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95' Z28 M6 (bright red)

-Borla exhaust, Edelbrock 1 5/8" headers and Y-pipe, no cat, G2 cold air, Edelbrock 52mm throttle body, underdrive pulleys, Crane Gold roller rockers, 3.73 gears, MSD 6AL and MSD wires, free mods.

-Hurst shifter, Bilstein shocks, Eibach springs, Metco control arms with relocation brackets, Hotchkis panhard rod, SLP subframe connectors, 1LE aluminum driveshaft, 1lE tranny mount, PolyEurethane end links, TA girdle.

 

Don, another way to go AFA the spring seats is Comp cams #4785. They fit the Crane dual springs too and that is what I have on my Formula (if you remember last year you had some advice for me when I was looking at getting some valvetrain stuff for my engine, you recommended the Crower rockers and that's what I went with, excellent rocker I may add).

Remember that the kit comes with steel retainers. Since you have heads that are done you may want to use titanium retainers instead in which case you should just buy the springs themselves Crane # 99893-16 and get the retainers separately # 99669-16 (titanium)

Originally I went this route but because I was installing this stuff on my heads which are stk. it was impossible to get the right installed height and spring pressures using the titanium retainers (it had to do with the fact that the stk. factory valves are a little shorter than most afkt. valve stems). If you had work done on your heads you most likely went with bigger valves so the stems on these valves are a little longer to give you some room to get the spring pressures and installed heights setup properly with titanium retainers. It took many a re & re by my friend at his engine shop on the one cyl. before he found out that I had to use the Crane kit (with steel retainers) you are thinking of getting to have the proper spring pressures and installed heights.

Like I said earlier, since you have heads that are worked on you may want to consider spending extra and getting the titanium retainers instead of using the steel ones that come in the crane kit.

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T.Chan
Toronto, Canada
email:dchanman01@hotmail.com

96 Formula 6 sp., 17x9 in. SS wheels, 275/40/17 S-02's, KBDDSFC, B&M =
ripper, K&N PIFK, HPP III, 160 stat., 255/50/16 BFG dr on ROH =
snyper wheels, hotchkis STB, LT4 km, Russell steel braided brake lines, JH coated SLP d/c shorty headers, Borla CB, Summit racing diff girdle, Crower 1.6 SSRR's, Crane dual valve springs, retainers & CC pushrods, E/brock 52mm T/B

 

Cman, interesting thought about the titanium retainers. I was considering doing that. I'm surprised that the Crane steel and titanium retainers are sized differently or are you refering to the Crane being different to the oem steel ones? I would believe that.

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HurstM6/CNC heads/11:1cr/SS 2”valves/Crower SS 1.6rr/HD rods/Crane2033 Cam/HPP+w/module & 160stat/52mm TB/SLPafpr/1LE bellows airfoil/G2 breather/aluminum valve covers/Magnecor 8.5mm wires/MSD Digital6+/SLP 1.75”ss coated hdrs/ss Y-pipe w/2 Random cats/LPE 3.5”shaft/pulleys/LT4km/ K&N/Torsen/poly stuff/ SLP pp, flywheel w/McLeod disc/GM3.73 gears/LS1 brakes/ HotchkisLCA&STB/348rwHP/348rwTQ-corrected

 

Yeah Don, from the discussion I had with my friend at his shop last year when he was installing my valvetrain stuff, he said that the 10308 kit from Crane is designed to be installed on a stk. LT1 head with stk. valves. Since originally I wanted to use the titanium retainers he found out after the many re & re attempts on the one cyl. of my engine that the reason he couldn't get the right installed heights with the correct spring pressures on the seat was because of the short valve stems stk. LT1 valves have.

With the t retainers, he either got the right installed height but the spring pressure was like 160 lbs. at the seat (too much) or he got the 120-130 lbs. spring pressure but the installed height was off. The t retainers is slightly different than the steel retainers crane packages in the 10308 kit, that's why I had to use the kit, hence the steel retainers on my car.

Like I mentioned earlier, since your heads are done and I believe you have different size valves (longer valve stems) on your heads, you should have the ability to use the titanium retainers, meaning you shouldn't have a problem getting the proper installed heights and spring pressures for your setup with the t retainers. You just have to decide if it's worth the extra coin to run them. Hope this helps.

Tony






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T.Chan
Toronto, Canada
email:dchanman01@hotmail.com

96 Formula 6 sp., 17x9 in. SS wheels, 275/40/17 S-02's, KBDDSFC, B&M =
ripper, K&N PIFK, HPP III, 160 stat., 255/50/16 BFG dr on ROH =
snyper wheels, hotchkis STB, LT4 km, Russell steel braided brake lines, JH coated SLP d/c shorty headers, Borla CB, Summit racing diff girdle, Crower 1.6 SSRR's, Crane dual valve springs, retainers & CC pushrods, E/brock 52mm T/B

 

i got 1.6RR and these springs in the mail-
i'm a bit confused-
all i should get is the L98 seats?

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project 383 underway
[purchased]bored/creaked block, crank, fuel injectors, main and cam bearings
In the mail:
Xe custom grind 236/242
Billet connecting rods
daul valvesprings
guideplates
hardened pushrods
1.6 Magnuim RR
11:1 forged WISECO pistons w/ plasma moly rings
Need: felpro gaskets gaskets, rod bearings[b]
for sale: (2)15x8 rims, New Trans Go, 2x75 2x50 watt amp with wiring and stuff, 3200stall Yank Torque converter with only 3 runs on it 3.23 gears, bose sub

- email me if you got anything I need or selling

 

For you guys using the L98 seats with these springs...how are you setting the correct spring height/seat pressures? Those seats have got to be a LOT thicker than the Crane provided "seats" that are supposed to give you the correct height/pressure.



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RobY
95Z28

 

CMan, thanks for the info. I just need to get around to ordering them. I'd like to get the titanium retainers. If I have to go to the trouble of swaping springs again I might as well add a mod so to speak.

Also, I'm unsure if I want to use the L98 seats. I might just use the ones that Crane makes for those springs. I'll check them out when I get them and then decide. As RobY comments, they might affect the established height/pressure. I don't know.


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HurstM6/CNC heads/11:1cr/SS 2”valves/Crower SS 1.6rr/HD rods/Crane2033 Cam/HPP+w/module & 160stat/52mm TB/SLPafpr/1LE bellows airfoil/G2 breather/aluminum valve covers/Magnecor 8.5mm wires/MSD Digital6+/SLP 1.75”ss coated hdrs/ss Y-pipe w/2 Random cats/LPE 3.5”shaft/pulleys/LT4km/ K&N/Torsen/poly stuff/ SLP pp, flywheel w/McLeod disc/GM3.73 gears/LS1 brakes/ HotchkisLCA&STB/348rwHP/348rwTQ-corrected

 

I know this is an old thread but...has anyone checked the installed height with the L98 seats? I used the "seats" that came with the 10308 kit. No problems, just curious what the installed height is with the L98 seats.



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'97 Z28 6 speed - Cayenne Red Metallic
CAI, SLP Shorties, Borla, 3.73s, CC305...
*288 rwhp / 312 tq
Best run to date:
13.384 @ 107.42
*Numbers before cam

Don't question the great...just enjoy us

My '97 Z28

 

I ordered that spring kit from Summit Racing over a month ago. They tell me that I should receive it 7 weeks from now!!

Anyway, once I get the kit I'll talk with some local engine builders regarding their opinion of the seats in the kit. I'm inclined to go with what Crane puts together in the kit, unless there is strong evidence otherwise.

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HurstM6/CNC heads/11:1cr/SS 2”valves/Crower SS 1.6rr/HD rods/Crane2033 Cam/HPP+w/module & 160stat/52mm TB/SLPafpr/1LE bellows airfoil/G2 breather/aluminum valve covers/Magnecor 8.5mm wires/MSD Digital6+/SLP 1.75”ss coated hdrs/ss Y-pipe w/2 Random cats/LPE 3.5”shaft/pulleys/LT4km/ K&N/Torsen/poly stuff/ SLP pp, flywheel w/McLeod disc/GM3.73 gears/LS1 brakes/ HotchkisLCA&STB/348rwHP/348rwTQ-corrected

 

Well, my Crane spring kit finally arrived and I had a bud (that builds engines for a living) stop by with the proper equipment to check on getting the proper installed height and spring pressures.

Here's what was determined. He didn't like the .015 thick hardened flat shims that Crane says replaces the oem cupped shims. He's concerned as is mentioned above of the springs walking all over the place. He recommended an L98 cupped shim that he states/believes is .050 thick. So, I'll need an additional .120 thick shims to get the correct installed pressure of 165lbs at a height of 1.80; 1.70 used. As Cman states above my aftermarket valve stems are a little longer.

I was a little disappointed in the relatively heavier retainers on the Crane kit over my oem's currently being used. I think I'll just use them for now as I've spent enough money lately. I'll report more once I get the L98 seats/cupped shims and get moving on this project.

I'm learning that swapping springs is much more techincal than I first believed. Having the right measurement instruments such as a spring pressure/height checker are critical particularly on modified heads.


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HurstM6/CNC heads/11:1cr/SS 2”valves/Crower SS 1.6rr/HD rods/Crane2033 Cam/HPP+w/module & 160stat/52mm TB/SLPafpr/1LE bellows airfoil/G2 breather/aluminum valve covers/Magnecor 8.5mm wires/MSD Digital6+/SLP 1.75”ss coated hdrs/ss Y-pipe w/2 Random cats/LPE 3.5”shaft/pulleys/LT4km/ K&N/Torsen/poly stuff/ SLP pp, flywheel w/McLeod disc/GM3.73 gears/LS1 brakes/ HotchkisLCA&STB/348rwHP/348rwTQ-corrected

[This message has been edited by Don 97 SS (edited August 26, 2002).]

 

Anyone have the part numbers for the L98 seats?

-B

 

I recently bought and installed a complete Crane valvetrain. The "off-road" crane cam,springs, retainers, locks, shims, Gold Race RR's. A good amount of $ but i wanted the best or so i thought. I recently helped a bud put the LT4 Hotcam kit in his car and everything worked perfect which is more than i can say for my "kit". I spent more damn money and got more headaches. WTF!!!!!! Crane tech support has jerked me around 100 times. I had to grind the underside of my RR's. WTF? Why should a $300 set of RR's need modification? Ok enough of my crying. My mechanic was hesitant to put any other shim under the springs because of pressures. So im stuck with a huge mechanics bill for something i should have been able to do myself. Do yourself a favor and use Crane's locks, springs, shims, and retainers together or not at all. If i had to do over again i would have gone with a different set of RR's. Just my .02

 

Okay, I just picked up a set of used LT1 cylinder heads (which I'll be porting and polishing this winter), and they came with the Crane 10308 spring kit, springs, retainers,etc. I also would like to use the L98 valve spring seats this thread is refering too, rather that those .015 "shims" that Crane gives you for spring seats. So...... does anyone have the GM part number for the L98 valve spring seats????? If you don't have the actual P/N, then my next question would be (obviously), what cars and model years had the L98 engine. If I knew the car and year info, maybe the GM parts guy could look up the part number??? TIA for all replys

 

L98 valve spring seat P/N: 1018-5066

 

I have the ISKY 235D springs on the heads I bought right now. I need to upgrade to the crane 10308's so what exactly do I need? I'm thinking of just ordering the kit and letting my head guy figure it out. He said he'd install em for free so I was relieved I woudln't have to do it. And I'm sure if he needed something else to make sure the springs didn't walk he'd let me know and I could just pick em up. This stuff is WAY too complicated!