New 390 stroker buildup...
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Posting Guru
Joined: Aug 2001
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From: Evanston, WY
New 390 stroker buildup...
I am helping a local kid build up a 390 for his 3/4 ton 4x4. He wants a brute, so here is the plan:
446ci
4.25 crank
4.09 bore
6.7 BBC H-beam rods
9.5-10:1 compression
Stock Ebock heads
Harland Sharp rockers on HD shafts w/endstands
Performer RPM manifold
Truck avenger 770
CompCams 280s 282adv 236@.050 .571 110
Standard Oil pump w/ARP shaft
Stock rear sump pan
What do you guys think? He wants something that will have decent low end torque, but not run out of breath too soon.
-Scouder
446ci
4.25 crank
4.09 bore
6.7 BBC H-beam rods
9.5-10:1 compression
Stock Ebock heads
Harland Sharp rockers on HD shafts w/endstands
Performer RPM manifold
Truck avenger 770
CompCams 280s 282adv 236@.050 .571 110
Standard Oil pump w/ARP shaft
Stock rear sump pan
What do you guys think? He wants something that will have decent low end torque, but not run out of breath too soon.
-Scouder
Thread Starter
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Posting Guru
Joined: Aug 2001
Posts: 2,117
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From: Evanston, WY
Originally Posted by rusty70f100
Sounds good. According to the desktop dyno, it'll make 419hp @ 5000rpm, and 495ft-lbs @ 3500rpm. The torque curve is pretty much flat.
Also, good news. We just finalized a deal with Patrick to buy his Ebock heads, manifold, and a bunch of other stuff for the build. We will probably buy the bottom end components next week and get it all sent off to machining.
-Scouder
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Posting Guru
Joined: Aug 2001
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From: Evanston, WY
Originally Posted by rusty70f100
Cool! Let us know how it turns out! 
I think this is the first time I've seen anyone on here use a solid lifter cam. Will you be blocking the oil passages to the lifters, or using shell type lifters?
I think this is the first time I've seen anyone on here use a solid lifter cam. Will you be blocking the oil passages to the lifters, or using shell type lifters?
-Scouder
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Posting Guru
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From: Evanston, WY
Originally Posted by Scouder
Haven't got that far yet. We are still looking for a piston. By my calculations we need a 4.09 bore, 1.345 compression height, and a 20 to 26cc dish to be at 9.5-10:1.
-Scouder
-Scouder
-Scouder
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Yep, you want a 1.345" compression height piston for zero deck. According to Desktop Dyno's compression calculator, a 19cc dish would put you at exactly 10:1 compression, assuming a 72cc combustion chamber volume.
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Thread Starter
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Posting Guru
Joined: Aug 2001
Posts: 2,117
Likes: 0
From: Evanston, WY
Originally Posted by rusty70f100
Yep, you want a 1.345" compression height piston for zero deck. According to Desktop Dyno's compression calculator, a 19cc dish would put you at exactly 10:1 compression, assuming a 72cc combustion chamber volume.
http://www.diamondracing.net/excel/ford/fedished.htm
-Scouder
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