I am going to build my heads for use with the LT-4 Hotcam. I have an extra set that I am going to build, then I am going to throw them on along with the Hot Cam. Are there better ways than others to build the heads to accomidate the Hot Cam?


[Modified by OrangeC4, 11:29 PM 8/10/2002]

 

flow more air ... :confused:

 

:lol: Glock, I think we've agreed on this one before. I also go with burn up more fuel. What do ya think?

Seriously - on the Building heads: read some of the Hot cam fan mail here. The cam will help almost any SBC setup. The technical curve is from about 2000/2200 to 6500/6800.

If you don't use the hot cam kit remember to increase your spring rates.

Happy pony hunting. :cheers:

 

Just remeber your cam specs when you work on the heads. I know this sounds kinda stupid but it's something a lot of people don't think about. I appoligize if I'm wasting your time telling you something you already know.

When talking about heads, flow numbers are key. However, just like peak dyno numbers don't really mean much, peak flow numbers don't mean much either. You are looking at the area under the curve, the larger the area, the better off you will be. So what's my point? Consider two pairs of heads, one peaks at 350 cfm at .700 lift yet flows 240 & .500 lift. The other set of heads flows 270 & .500 lift, yet crashes down after .550 and doesn't even flow 250 @ .600 lift. Believe it or not, strange things happen with airflow and the above is very possible.

Although the first head has a higher peak flow number, that peak is useless. The hot cam only has a lift of .525 This would make the second head the better choice. So tweak the term "area under the curve" to "area usable by your cam" and you'll get a much better picture.

As you may or may not know I'm getting a set of heads for my Hot Cam right now. A good friend works at the shop that is doing the work. He has some good tricks to help me out. For example, he can do something with the valve job that absolutely kills upper lift flow numbers (.550 +) Why would he do that? Well it returns greatly on the mid lift flow numbers. Perfect for the hot cam. It can flow 0 cfm @ .550 lift for all I care, I'll never get there and I'll gladly take the gains on the lower end.

Be sure and keep us posted on what you decide to do.

 

I am looking for how far to port the heads.

 

What are your plans for the intake? The hot cam loves to spin past 6000 rpms, even with some good heads the TPI intake is going to have trouble with that.

 

Nathan Plemons has given you some good ideas. Why not look at the LT4 numbers, since this is what the cam was original designed for? Rough calculations indicate the cam can use 10% to 15% more flow than a stock LT4. (Don't quote me!) Like Nathan said: look at .3 to .4 flow numbers and remember you don't care above .525 lift.

I hope this helps.

 

i'm surprised no one mentioned springs. make sure you have hoss springs, good enough to take a much larger cam, should you ever decide to upgrade.

 

I DID! Read above.

 

Im with Nathan Plemons you have to port your heads for what you want them to be used for but I think people are forgetting here is that these are stock head and that he does not have a flowbench to where where to pot and to not to port to get the good flow number at low lift.
The pros get the good number at low lift because they have spent days on the flowbench and that is why you are spending the big bucks when you get them to port for you.
Then you have so many ways to port heads stage 1, 2 and 3 how do you want to port them all the stages are so different and the higher you go the more it is going to cost you.

Jay

 

oops! sorry, skippy, certainly didn't mean to steal your thunder.

 

MSR,
Steal my thunder? Gees, I sure hope I didn't come off that way. My ego's not THAT big. :D
The forum does seem to cover the same stuff over and over and the threads do the same thing, sometimes. I know I've been guilty of missing information in previous posts.

I sure wasn't offended. And I sure hope you weren't.

Happy Pony Hunting.
Skippy the dog.