[jshighperformance]

I have two cams the first one is a Comp 300b this is the cam I have been running, the specs are http://www.compcams.com/Cam_Specs/Ca...csid=1223&sb=0 the other one is a Lunati the specs on it is http://www.lunatipower.com/Product.aspx?id=1746&gid=247 I hope these links work, I've never done it before. The motor is a 4.25 stroke 400 with 6.8 rods (461) with Kauffman High Port heads, I have a Victor intake and 1050 dominator on alcohol. The motor is in a rear engine dragster. I use a powerglide trans with 4000 stall and leave at 3600 and shift at 5800 rearend ratio is 4.00 and I run a 14x32 tire. I run mainly 1/8 mile and run mid 5.20s I ran the Lunati cam in a 400 years ago and it worked good, but a totally different combo, just wondering if it might work better than the 300b. I know that I could go to a roller setup and pickup, and I may do that someday but for now I'm going to run what I have.

[60man]

I'm no cam expert but they both seem "small" for Hi-ports. Understand using what ya got though..They both are very close (IMO) so I would go for the Lunati with the greater lift to take advantage of Hi-ports flow. Use 1.65 or 1.72 rockers if you can for max lift..
Curious what "the experts" have to say as I'm trying to come up with a cam for my combo myself..

[Kyflier]

Hey JS, is tha the cam you bought from me?

[jshighperformance]

ky, no I have never bought a cam from you, must have me mixed up with someone else. I agree that both of these cams are small, and I'm using 1.65 rockers. When I switched from 1.5 to 1.65 on the 300b I picked over a tenth.

[Kyflier]

I just sold one on ebay a month or so ago, and when I saw the cam you had was a 40711 Lunati, thougt it might have been the one I sold. No biggie. Good luck with your project

[Ron H]

I don't think the Lunati will outperform the 300B.
May as well hang with what you have until you can put a solid roller in it with a good amount of lift.

[jshighperformance]

I just done some math and the 300b with 1.65 rockers is .618/.612 lift and the Lunati with 1.65 rockers is .633/.636 so that would be a difference of .015 intake and .024 exaust lift between the two cams. My question is how much does rocker ratio effect dur.? I think Ron is right but since I have both cams I will try the Lunati, I'm sure that valve clearance and springs should'nt be an issue, but I'll double check.

[Ron H]

But you are not accounting for the valve timing differences. The lift difference will not give much if anything.
I think the less overlap and shorter duration on the lunati will slow you down even with the slightly more lift.
Don't know until you try. But it is a bit of work to swap. And gaskets, etc.

[FBNRacing]

If you picked up a tenth with the rocker arm change, your car is begging for more cam shaft.

Rex