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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

CC306 + which locks and retainers?

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Old 03-12-2009, 09:22 AM
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Default CC306 + which locks and retainers?
Ok i jsut bought a cc306 cam from a member here and I think i am going to go with the comp cams 987's but am wondering which retainers and locks i should go with? I did a search but didnt come up with what i was looking for.. Any help would b greatly appreciated thanks
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Old 03-12-2009, 09:44 AM
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740-16 retainers and 613-16 locks should work fine with the 987s.
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Old 03-12-2009, 10:00 AM
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what lift does the cc306 have? What lift are the 987 springs good until?
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Old 03-12-2009, 10:17 AM
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Originally Posted by MTBSully
what lift does the cc306 have? What lift are the 987 springs good until?
GM "847" 234 / 242 - .574/.595 - 112 LSA (1.6 rr's)

Comp 987
# Seat load: 121lbs @1.800''
# Open load: 343lbs @1.200''
# Coil bind: 1.150''
# Rate: 370lbs/in
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Old 03-12-2009, 10:18 AM
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CC306 is 230/244, .510"/.540" 112 LSA. Those lift numbers are with 1.5 rockers however. With 1.6s, you're looking at .544"/.576.

987 springs bind around .620", depending on installed height - well within the range of the 306.

Originally Posted by ss.slp.ls1
GM "847" 234 / 242 - .574/.595 - 112 LSA (1.6 rr's)

Comp 987
# Seat load: 121lbs @1.800''
# Open load: 343lbs @1.200''
# Coil bind: 1.150''
# Rate: 370lbs/in
Hmm...
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Old 03-12-2009, 10:22 AM
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Originally Posted by RamAir95TA
CC306 is 230/244, .510"/.540" 112 LSA. Those lift numbers are with 1.5 rockers however. With 1.6s, you're looking at .544"/.576.

987 springs bind around .620", depending on installed height - well within the range of the 306.



Hmm...
I just copied and pasted the cam specs off of Ai's website. I think the ones you posted is correct though.
Those spring specs are off of JEG's description.
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Old 03-12-2009, 11:30 AM
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You described the 847.

He asked for the 306.
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Old 03-12-2009, 11:37 AM
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Originally Posted by RamAir95TA
You described the 847.

He asked for the 306.
Ohhh, LOL, my bad.
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Old 03-12-2009, 03:21 PM
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anyone have a good article for measuring install height? I have a .555 lift cam right now, with 987s, and i want to throw probably around a .590 lift cam in . I'm hoping my install height isnt too high so i dont have to swap out my springs.
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Old 03-12-2009, 04:00 PM
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Originally Posted by MTBSully
anyone have a good article for measuring install height? I have a .555 lift cam right now, with 987s, and i want to throw probably around a .590 lift cam in . I'm hoping my install height isnt too high so i dont have to swap out my springs.
I don't understand why you would have to change your installed height. If the spring can handle the lift of the new cam, then it should be fine as is. Sorry if I am mistaken. What is the current installed height? 1.8"? 1.75"?
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Old 03-12-2009, 05:07 PM
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Originally Posted by ss.slp.ls1
I don't understand why you would have to change your installed height. If the spring can handle the lift of the new cam, then it should be fine as is. Sorry if I am mistaken. What is the current installed height? 1.8"? 1.75"?
thats the problem. Previous owner never told me/forgot, so i dont know what the install height is. I think im just gonna stick with the 987s. However, with a new cam I will have to check pushrod length again correct?
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Old 03-12-2009, 05:32 PM
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Originally Posted by MTBSully
thats the problem. Previous owner never told me/forgot, so i dont know what the install height is. I think im just gonna stick with the 987s. However, with a new cam I will have to check pushrod length again correct?
If you are not changing the heads, deck height, gasket thickness, etc and only doing a cam swap, then your applicable pushrod length should not change.
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Old 03-14-2009, 06:22 AM
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Ive got the 306 and Im using the 918 beehives. Just an option for ya.
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Old 03-14-2009, 09:13 AM
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anybody know if the locks and retainers that work for 987s would work on 918s?
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