hp guess?

[gr868]

anybody have a horsepower simulation program? i am curios to see what my combo makes 350 30 over vortec heads crane cam 218 duration at .050 .454 lift intake and exhaust (274h-10) seems pretty good i just can't find anybody using this cam usually a bigger split duration one but i have that now and it is soft thinking of going back to the crane also for emmision reasons thx in advance!

[Fast01]

anybody have a horsepower simulation program? i am curios to see what my combo makes 350 30 over vortec heads crane cam 218 duration at .050 .454 lift intake and exhaust (274h-10) seems pretty good i just can't find anybody using this cam usually a bigger split duration one but i have that now and it is soft thinking of going back to the crane also for emmision reasons thx in advance!

Need a bit more information to even make a guess, much less punch it into a computer program. I have Desktop Dyno, which is not the best program out there, but I'd be more than happy to run the numbers for you if you give me some more info. on the combo. What's the compression ratio? Which carb on what intake and header size?

[gr868]

o.k. thank you very much 8.5 compression edelbrock 600 cfm carb edelbrock air gap manifold 15/8 long tube headers 2 1/2 flowmaster exhaust system

[Fast01]

I ran it and came up with 343.7 hp @ 5000 and 399.6 ftlb @ 3500. If you go to Comp Cams website you can download the program I used for free. It's called Cam Quest 6. Go to the website and the link is on the lower right hand corner. It's certainly no substitue for a real dyno, but it should help to point you in the right direction. Looking at your setup I'd say it's probably pretty close. Good luck with your build and have fun with the program. I do!

[gr868]

thanks that's about what i thought it was making has anyone got a better cam recomendation than the crane i still have to pass emisions though i have tried the comp 268 it was a little softer than the crane i thought thank you for running it for me

[Fast01]

No problem! I'd look at two things to bring your power up a bit. The first being compression. 8.5:1 is pump gas friendly, but is certainly leaving some power on the table. The second is the cam, which you already requested a suggestion for. If you're going to swap the cam I would raise the compression a bit too, 8.5:1 isn't really going to like too much more cam. The easy way to do this is to swap the head gaskets for some Fel-Pro 1094's which are .015" thick. I don't know the thickness of the gasket you're using, but I'm going to assume that it's in the .040" range. Performing the gasket swap should bring your compression up to about 9:1 or so. A little better for our purposes and still pump gas friendly. This will actually have a two fold effect. Raising the compression and optimizing your quench. Again I'm assuming here, but if you haven't decked the block your pistons are going to be .020"-.025" in the hole. That coupled with the .040" gasket thickness is going to give you .060"-.065" quench. distance. You're totally losing the benifit of the quench design of the Vortec head and losing combustion efficiency. Swapping the gasket out will bring your quench down to .035"-.040", which would be optimum. Ideally we're looking for .035"-.055" for quench distance. Running more than .060" defeats it's purpose completely. Of course if you've decked the block or changed compression heights on the pistons this won't work, as you won't have enough clearance then. Also, if you do switch to these gaskets THEY MUST BE RE-TORQUED after your first heat cycle! This brings us to the cam. I would try one of Comp's Extreme Energy cams, the XE268H. Running that one with the higher compression, I'm coming up with 370.4 hp @ 5500 and 407.6 ftlb @ 4000. Again, these numbers may or may not be accurate, but I think it would be safe to say you'd be moving in the right direction.

[gr868]

great advice fast01 i just kind of guessed on the compression i am using fel pro head gasket from their engine gasket kit so i have no idea of the thickness i don't think the block has benn decked because the pistons were slightly down in the hole but what your saying makes a whole lot of sense thanks for the reply!

[Fast01]

great advice fast01 i just kind of guessed on the compression i am using fel pro head gasket from their engine gasket kit so i have no idea of the thickness i don't think the block has benn decked because the pistons were slightly down in the hole but what your saying makes a whole lot of sense thanks for the reply!

Any time!

I believe their gasket sets use the permatorque gaskets which are .039" compressed thickness, so the steel shim gaskets should help raise your compression. It's just important that you remember to re-torque them and I'm sure the pistons are in the hole, so they'll help to improve quench as well.