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

cc306 a good turbo cam?

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Old Aug 2, 2004 | 02:38 AM
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Default cc306 a good turbo cam?

just wondering if it is since i plan on getting a turbo soon..if not, what cam would be best to use with a turbo..i plan on using the sts turbo kit..thanks
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Old Aug 2, 2004 | 02:47 AM
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Not at all. Way too much intake duration for boost, you'll end up bleeding off a lot of air pressure by keeping the valve open for too long. You'll want to keep it a lot lower and keep the split pretty wide. I'd suggest a Comp XE 224/236 on a 114 LSA to minimize overlap as well (don't want to blow air pressure out of the exhaust valve if they're both open at the same tiem). The object is to open the valve high for a short amount of time to cram all of that lovely air pressure in there as quick as possible without bleeding off the pressure.

Cliff Notes
- Comp 306 would be terrible for boost
- Go with a Comp XE 224/236 114

Hope my opinion helps.
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Old Aug 3, 2004 | 08:09 PM
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enisguy, you do realize that the cam you suggested is just like the 306 but smaller right? usally lt1 guys will go with a single pattern cam or even a reverse split, you do not want alot more exhaust duration like you would for NO2 or blower.
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Old Aug 4, 2004 | 08:11 PM
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the 306 has more intake duration and tighter LSA(112) hence more overlap. thats where the differences are and thats what matters. as far as the exhaust duration, im not sure about turbos since they require the exhaust to work
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Old Aug 5, 2004 | 03:10 PM
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incorrect Blackz93. most LT1 guys go with a traditional split patter, rarely a single pattern, and almost never a reverse split. Single pattern and reverse splits are left to the LS1 guys because their intakes are their "crutch" or restriction.
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Old Aug 5, 2004 | 03:44 PM
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Originally Posted by blackz93
enisguy, you do realize that the cam you suggested is just like the 306 but smaller right? usally lt1 guys will go with a single pattern cam or even a reverse split, you do not want alot more exhaust duration like you would for NO2 or blower.
I thought I explained it pretty clearly. I can't remember the last tiem I saw an LT1 with a reverse split cam. Reverse split cams are not a very good choice at all for F/I. As far as the exhaust duration with a turbo, you may be right. How does the exhaust duration change with a turbo setup as opposed to a blower setup? My guess would be that with all of the air pressure entering the combustion chamber, keeping the exhaust valve open longer would be better.
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Old Aug 6, 2004 | 05:14 PM
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do some research on it. ive never seen ONE lt1 use a big split like the 306 for a turbo...as far as a cam made for the turbo motor that is.
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Old Aug 6, 2004 | 09:20 PM
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Originally Posted by blackz93
do some research on it. ive never seen ONE lt1 use a big split like the 306 for a turbo...as far as a cam made for the turbo motor that is.
Did some research and you're right, good call.

http://www.cmotorsports.com/engine/l...ft-design.html

Checked out c-motorsports turbo cams and they are all as you described. I wasn't familiar with turbo cams and thought that they were just like blower cams. With that said, does anybody know the reason for this? I'm sure it has something to do with the way the turbo produces air pressure from exhaust heat, but I'm not sure how.
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Old Aug 11, 2004 | 12:51 PM
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i didnt know you were specifying turbo setups. I read your line to be that you rarely see LT1 guys use split patterns and i disagreed with you. As for cam selection in the turbo world, you got me! Ive never even looked into a turbo setup, thats voo-doo majic as far as im concerned
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Old Aug 11, 2004 | 02:15 PM
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I thought you guys might want to see this. Since you were against a decent sized standard split cam....Linky
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