ok, I picked up a 78 318 last summer for my 81 d150 short box, motor has maybe 10k on it, the guy said it had a rv cam in it well before I swap the motor in I would really like to throw a new cam in, I want something with a lopey idle yet still have power an not have to change my valve springs if I can get away with it.. I have been checking out the summit brand cam's an they seem pretty affordable are they any good?? the truck will have a 4bbl intake 500-600cfm carb, header's, hei ignition, all the cheap upgrade's for now.

Me too, I want to build a mileage 318. I have some viper rods 6.221" in length which will give me too high of a SCR as is (maybe an atkins build) with my 318 pistons/302 heads for 87 octane. But here's a BTT for ya

i had a summit cam in a 70 318 long ago. it was the .441 lift cam they sell. i had a nice lopey idle and woke up the motor. the valves floated at higher rpm's with the stock springs, a scarey sound. comp cams 901 springs only cost $60 all you need is a valve spring compressor, they are easy to change.

I had a 340 purpleshaft cam sitting around so that's what I put in my 318. It sounds good and pulls up a very steep hill by my house with ease. That's all I really need it to do.(sound good and be able to get out of it's own way) I didn't drive it enough last fall to get any mileage info on it.

Google Hughes Whiplash cam

We ran all the Summit cams.The small one is basicaly stock.The larger is a decent cam for the price.Has an agressive sounding idle but has great street manners.Had one in my kids truck.He drove it daily forn 3 years with no problems.It does pull good also and pretty much a drop in.Rocky

That 78 318 has low comp keep the cam below or at 440 lift a older 360 cam would perk it up and a Comp 252 or 260 single pattern would work very well.

I ran Summits small cam in my 83 Ramcharger 318.It ran great.Pulled strong up to 5600.Rocky

How would a Hughes Whiplash work in a '84 318 with stock lockup converter and 2.94 gears? I'm about ready to do a cam (was thinking the Summit K6900 cam) change when I replace the timing chain. Has stock exhaust manifolds with 2.5" single exhaust and a Performer intake/1406 Eddy.