390 Performance Expectations?
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390 Performance Expectations?
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.
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.
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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
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
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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
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
Post Fiend
Joined: Jan 2003
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From: Iowa
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.
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.
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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
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
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Hotshot
Joined: May 2003
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From: south louisiana
Originally Posted by Azguy54
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.
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.
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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.
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.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
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 )
Cam Info
Elder User
Joined: Nov 2010
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From: Glendale, AZ
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.
Tuned
Joined: Mar 2011
Posts: 361
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From: Bliss NY
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.
Elder User
Joined: Nov 2010
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From: Glendale, AZ
When you say similar build; are you using the same pistons and heads?