I got the 318 on the dyno and fired up this afternoon. So far naturally aspirated it's pumping out 229hp@5135&267.5@3722rpm. It's a bit rich yet and I'm going to lean the secondaries out about 4% tommorow morning and make another pull before hooking up the turbo.
It's a big improvement over the bone stock motor a few years ago when it pumped out a stump pulling 160hp.

Can't wait! Ought to be very interesting!!

I have to pull it a little higher too Greg. I only went to 5135 rpm and the hp was still going up. Also have to pull a valve cover and check the pushrods. The last stock set gave up and bent. I have a bit more spring pressure than the old motor. Interesting too the motor was only using 372 cfm@5135rpm. The f/a ratio was at 12.00 at the end of the pull so I'm going to try and lean it out to 12.5/12.75.

A 318 with proper machining, stock internals and the right cam will make 320HP with the wacky TQ..

Would extra fuel be better? My Saleen blown Mustang makes great power at 11/1 ,7.5 psi, cast pistons, 55,000 hard miles on it.

I did not screw it together trying to make maximum hp naturally aspirated. There is a GT-45 turbo hung on it.
Greg, I'm jetting it for Max hp naturally aspirated to see what it makes without the turbo. After that the secondaries get rejetted so it's high 10's low 11's for the turbo. It will be interesting to see how much the turbo increases the output and how much more cfm the motor sees.

Fun stuff!!

The 318 2bbl was rated at 230hp for a long time.

Well it didn't go very well today. I found a mouse had camped out in my phase convertor and I had to do some backyard engineering to get my water pump running. All the while my phase convertor was smoking and sparking.
Anyway, naturally aspirated it didn't really gain anything so I richened up the secondaries and hooked up the turbo and dropped the timing back to 20°. It ran great until the clamp on the tube between the carb hat and the turbo said uncle at 4252 rpm. I also blew an O-ring on the blowoff valve.
Anyway, it was at 423.1hp&517.4ftlbs@4152 rpm and still going straight up. Boost was at 15.07psi.(I should add that all pulls were done on C14)
I'll have to rewire the phase convertor and pick up some better clamps before I explore the outter limits of the 318.

Cool deal! I think a turbo is calling my name.

How low do you have boost, and what A/R is the turbo?

Jeff, the turbo specs are at work but it is sized for this motor, on the dyno it's at 2lbs. by 2500 rpm.

Therefore: good choice

What are the particulars on this beast? I'm curious about heads, cam, pistons, manifolds, etc.

R.

Stock short block, 8.9-1 (deck O-ringed with Clark copper head gaskets), 302' heads with 1.88/1.60 valves, summit house grind cam, .441 lift, 218/228@.050 114C. Performer intake, Eddy 600cfm carb.

The 229hp is with ex manifolds?

Yes, it's not the nicest exhaust system, it's junk off the garage floor. Also it's exhausting through one 3" pipe.
And at the same time I don't get to hung up on numbers, I look at the amount of change seen.

When your learning there is no need to ruin parts shooting for the moon

I wonder if the power were better to begin with, if the percentage of change/gain would still be the same, with the same amount of boost per rpm point.

I mean, it should be pretty easy to get close to another 100hp out of that 318 with some head work, headers, faster cam, etc.

If you made 500hp with xx boost from your 229hp starting point, that’s 2.18 times the original power output.

If you started at 330hp, would that same xx boost still increase the output 2.18 times(719hp)?

I definitely don't want to try and push it that far with stock parts. The first one I did went from 160hp to 536hp with just a 800 Thermoquad and 26 lbs of boost.
I may drop the pipe off the turbo just to see how much restriction it's causing. Also, about 550hp is about as far as I dare push on this thing. I've got 3 sets of trashed pistons already and I am getting tired of unzipping this thing.