Well, got the parts in a row and ready to go, again. Long story.

Trying to get some idea of performance to be expected from the following build-up.
Block is 390 at .030 over

Heads
2.09 and 1.65 valves, will port match to the intake. C8AE-H units

Comp Cam, XE262H, 262/270, 513/520, 110 lobe sep. Lift is listed at 1.73, I will be using the adjustable units from DSC at 1.75 ratio.

Speed Pro H304P, Hypereutectic pistons, 1.759 Compression distance, .080 dish @ 3.220 dia.

Eledlbrock Performer RPM with Edelbrock 600 CFM Carb.

Hedmen Elite Headers w/3" exhaust w/X pipe

Just an idea guys. Compression, HP and torque? Thanks ahead of time.

 

How many cc's does the dish displace?

 

OK Rusty, here goes. If I remember my math rioght, and that could be anyones guess....
Take the area of the dish, mult by the depth, .080, should equal volume in C.I, .6515 c.i.. If that is correct then converting to cc's by dividing by .06 = 10.858 cc's. Does it make sense when you plug into whatever it is you plug it into:-l Thanks

George

 

Ok, with .020" thick head gaskets you end up with 10.07:1 compression.

I cant run DD2k simulations with that cam. The spec card wont come up on the Comp Cams website. Sorry.

 

Thanks Rusty
If you tell me what you need I will call comp cams and get the info. Also if I go to a, what is it, .041 head gasket (?) what does that do to the compression ratio? Worried about running regular pump gas at the comp ratio you stated. Or should I even worry 'bout that at all.

George

 

With the .041" thick head gasket you're at 9.58:1 compression. This would be better for pump gas.

The specs I need for the cam, are the intake opening event, intake closing event, exhaust opening, and exhaust closing event. I need them to put the cam into DD2k. I can recalculate the lift with 1.76 rockers.

 

Thanks Rusty
I'll get the info to you as soon as I can get it from Comp Cam. Appreciate the help. Kinda stuck on the "build". Needed the rods resized with ARP fasteners and they are not done yet. Be in So Cal next week on biz so no go this weekend. Hopefully next. Can anyone think of anything else I might be "missing" before I FINALLY get going on the build. Almost MISSED on resizing the rods, don't want to miss anything else.

George

 

With that combo, I wouldn't expect more than about 350 hp. Carb's too small. Exhaust is way too big. Duration is less than I like to run, but may be OK with the lower comp ratio. With a bigger cam, more compression and a bigger carb, you would be in the 375 to 400 hp range.

 

I was wondering about the carb. The orginal engine was a 360 with an Edelbrock Streetmaster. This was the carb. as we got it. I rebuilt it to save a couple of bucks. Looks brand new and the Performer RPM looks great as well. As for the compression I was concerned about running regular pump gas so I didn't want to get too crazy with it. If I stay in the 10:1 range would that preclude running regular gas? Am I going to be starving this engine with the present carb.?
I will be giving this truck to my oldest for a wedding present (he doesn't know that yet) with the stipulation that the truck STAY in the family and that ANY mechanical work is a family job. That being said I don't want to "saddle" him with too much horse, lol.

 

Well I'm running my 68 Merc's 10.25 to 1 ratio 390 on 87 unleaded. But this is with a Crane 272 degree Energizer cam. I don't recall offhand what the LSA is on it though and how it compares to your's.It does ping occasionally with 87, but not at all with 89. As for the carb, it'll just limit the upper rpm range, not the bottom end ( may be a good thing in your case LOL )

 

Ok, got the info you wanted. Intake opening event, 25, closing at 57. Exhaust opening at 72, closing at 23. Thanks Rusty

 

Anyone know whatever became of this build? I'm using the H304P pistons also with C8AE-H heads on my 390. Was concerned with compression ratio as these pistons have a large dish and sit .030" down the hole.

 

I have a simelar build at 10:5 to1 compression running 95 to97 octane. Love the performAnce not the Mpg. Sometimes I get ping with 93. Never understood how anyone could run 87 on an Fe as it never was suppose to run on it let alone etherol.

 

When you say similar build; are you using the same pistons and heads?

 

No. Dishes with eyebrows and 020 deck clearance. C8ae A heads mostlikly 2.02 intake 155 exhaust or size up. Comp268 cam 1:75 adj. Rockers. Similar.