Ok, what i thinki will do is put on the ported lt4 heads and intake, but i dont know what to run as far as a cam right now. What cam would make the best power with this set up on my car. Looking for really good track time plus great rwhp. I thought the hot cam would go good, but guessed wrong. Any help would be greatly appreciated.

Thanx
Dan

 

GM 847 will give 400+ rwhp assuming you have a well running car and a decent head porter

 

is that the part number and am i same running that one with the stock bottom end??

Thanx
again.
Dan

 

GM part = 12370847 .

Yes, thats on the stock bottom end, expect to sping some high rpms to put down the power however. There are only 4 or 5 of us running it on this board, but we are all putting down some very nice numbers

 

Also forgot to mention, that is still a very streetable cam. If you are going all out, solid roller will make more power, but i would never run one on a mostly street car.

 

Just wondering, how does the GM 847 compare to the CC 306?

 

I would go with the CC306, the Comp Cam 224/230 XE, or the Comp Cam 230/236 cam. If you want hp and streetablilty go with one of these. The 230/236 and cc306 are very agressive cams that are known to lay down some hp.

 

CC306 GM 847

j/k

GM847 has higher lift the the CC306, but they are pretty close i suppose. Pretty much putting down same times.

My time in the sig is with a Cc306, stock waterpump, stock tb, stock heads. Car made 348rwhp and 344rwtq.

 

the 306 = 230/244 .510/.540 (with 1.5) on 112
the 847 = 234/242 .539/.558 (with 1.5) on 112

 

i am partial to cam motion. I have used them in several motors with good success. I also sell them

 

Dammmm!!!! You guys are really selling me on a GM 847... Maybe this winter.

 

im going with the xe 230/236. i should have some numbers soon. i also have lt4 heads and intake fully ported and polished. ill post the numbers when i have them. thats with 1.6rr's.

 

now my next question would be, if i have the lt4 heads do i have to change out my springs and stuff to handle the gm 847?? or would the stock lt4 springs handle it??

Thanx
Dan

 

Those LT4 springs will have your valves toasted within 5 min of initial startup. They arent even close to cutting it.