jst

And,are these suitable for a bolt on car?I am trying to get all the answers before I make the purchase.

Speed Density

iTrader: (38)

847 is larger.

Yes they will work for a Bolton Car.

Do a search on "GM 847" or "CC 306" and youll turn all the answers for any questions you have.

Tony.

jst

GREAT!!!thanks

9formula4

iTrader: (5)

wait wait wait.... DO NOT use either of those cams unless you have upgraded your valve springs and your rockers. The stock springs CANNOT take that kind of lift they will bind and you can kiss your valves goodbye and say hello to LOTS of headwork.

OutlawZ

iTrader: (4)

he's right.... a CC306 would run alot better in a car with better head flow.... when you're running stock heads i'd stick with something more suited for stock head flow.... running a massive cam won't give you the most power for your buck....

and the CC306 is kinda older tech for an LT1.... There are much better cams out now with better ramp speeds... I like the Xtreme Energy line from comp.... if you want something similar to a cc306 get the 236/242.... .556/.576 lift with a 1.6 rocker and a 112lsa..... nice cam, sick idle, great power na and on spray.... but i'd still look into some head work if you're gonna pull the cam and do that much work...... either way good luck...

zigroid

iTrader: (22)

Cam Timing: TAPPET @.004 GM847
---------Opens-----Closes---ADV Duration
Intake---37 BTDC--79 ABDC--296°
Exhaust--85 BBDC--39 ATDC--304°

Cam Timing: TAPPET @.050 GM847
----------Opens------Closes-----Duration
Intake----10 BTDC ---44 ABDC---234°
Exhaust---58 BBDC---4 ATDC----242°

Cam Timing: TAPPET @.006 CC306
---------Opens------Closes ----ADV Duration
Intake---37 BTDC---73 ABDC---290°
Exhaust--90 BBDC---37 ATDC---307°

Cam Timing: TAPPET @.050 CC306
----------Opens-----Closes -----Duration
Intake---7 BTDC-----43 ABDC----230°
Exhaust--58.5 BBDC--5.5 ATDC---244°

the GM847 is a little bigger. it has a little more overlap than the CC306 so it will idle a little rougher. your bottom end will be really sluggish.

jst

I am looking for a much rougher idle than the stocker.What do I need to look for?I know the springs will need to be replaced along with the rockers.

UA-Plumber

iTrader: (2)

Might as well get new pushrods while your in there. And a new timing chain set.

Z48LT-1

I have no real live experience in this matter, but I'll throw this out for discussion: how about the LT4 hot cam? It's the product of the GM engineers and was intended to be used with OE, not aftermarket, heads and intake, and is somewhat stouter than the F-body stocker, and can be had in kit form with springs and 1.6 roller rockers for a little more than $500. shbox.com has detailed installation instructions. I gather it's got something of a lope at idle, and should work well with a basically stock engine. JM$.02USW.

IllusionalTA

iTrader: (9)

847+stock motor=

TurboZ28

UA-Plumber

iTrader: (2)

Bingo

OutlawZ

iTrader: (4)

The hot cam is definitely a good deal but for as much work as you have to do to R&R a cam the opinions I've heard about it was "too much work for a minor power gain"... and you won't hear much of a lope.... that thing is plain tiny..... might see like a 200rpm powerband increase for top end and 10-15hp IMO..... not enuff power jump when you have to buy your buddies 3 pizza's and 4 cases of beer to come over and help you tear down your engine.... hell you'll have more bruises on your hands than the number of hp you'll pick up with it..... don't get me wrong it's a good deal and it's a nice smoggable cam for the emissions states but when I put a cam in I want to know and hear that it's there..... BRAAAP BRAAAAP BRAAAAAP BRAAAAAP..... nice lopey ******..... that 236/242 xtreme energy lopes like a ****...