Comp cams xe268h for 318
I love this thread so much cuz Im currently putting together a 318 thats getting the Comp XE268H cam, 360 heads, a Weiand intake, and either a Holley 600 carb or an Edelbrock; Im leaning towards the Holley. I cant wait for the disappointment!!!
You forgot to mention the 10/1 pistons.
With that cam,those heads,a big-port intake, and on the street, with a street TC and street gears; Cylinder Pressure is gonna be of prime importance.
Cylinder pressure, on the track,is perhaps less important because the engine only runs thru the soft zone once, and with a BIG TC and Race gears, that only takes milliseconds.
But in a streeter; pressure makes it possible to run less TC and less gear, and have a more fun combo. Your street teener can't afford to give up pressure, unless you also run race gears and a BIG TC. 3.55s and a 2800 are barely gonna cut it. Your combo might end up with cranking pressure of 120psi@130ft elevation. ............. which makes the low rpm really really soft . If your new combo is stuck with an 1800TC and 2.76 gears, it is gonna be a total dog up to about 25/30 mph. The 2800TC will get you almost past that, but the 2.76 gears are gonna keep you in first gear to 65/70 mph,so you are not gonna win any ET awards.So then to remedy that, some guys run 3.91s or better with 360s and that cam.
On the Street, the gear to TC ratio is kindof a balancing act. More gear allows less TC and more TC allows less gear. If you need to keep Hiway cruising in mind, well that throws a monkey wrench into the mix, and the usual cure is more cubes or less cam. More cubes allows less TC, and less cam makes more pressure so ACTs like a bigger engine.
But maybe you already know all that... I'm just trying to help.
