MPG change after cam swap

[vikingpower]

I'm putting in the TFS1 cam and am wondering how much my highway mileage is going to decrease. Any of your personal experiences are appreciated! My mods currently are: Stage1 ported TW heads, Typhoon manifold, and stock cam w/1.6 RRs. I'll be adding the TFS1 cam, 30lb injectors and possibly sending off the lower manifold to Extrude Hone or buying a Victor 5.0 intake to replace it. I'm thinking about buying a Victor because I'm also getting a built 306 soon that'll be a real spinner pretty soon.

 

[matm347]

You'll notice the change. You'll want some more head work, and possibly a different cam choice if you want a HIGH RPM 302. Or just go with a TFS Track/Performer RPM II intake, it will better match your combo when compared to the Victor. I think the TFS R will give better low end than the Victor will.

 

[JBeezy53]

Yeah a TFS1 and a Victor don't really match up. As said above I believe the TFS Track Heat or Perf II will fit you better. But to get more out of that set up you might want to go with a TFS2 since you are looking for more RPM. Also the Perf II makes more power than the Track Heat past 6000.

 

[ninety15.0]

After my cam swap and motor build, i actually gained highway milage. Im running the steeda # 18 with 1.6's and maybe with the added compression and better air flow, its actually a little more efficient at 2500 rpm than the stock motor was? im running 3.73's with a 5 sp....i went from about 22 mpg to about 24-26...at between 70 and 75mph.

 

[vikingpower]

Thanks guys, in response to what ya'll said, I would only be using the TFS 1 until I get a new shortblock, after that I'll upgrade the cam to a solid roller and put in some Comp Beehive springs w/Ti retainers and locks for the valves. I'm looking to upgrade the intake right now because it feels like the one I got now is running out of breath; it looked that way to me when I put the heads on that the Typhoon doesnt flow nearly as much as the intake ports on the heads but was strapped for time then because I had to go on a 2000 mile road trip soon after.