390?????
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Postmaster
Joined: Nov 2003
Posts: 3,568
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From: Middleton, ID
390?????
what is the difference between a 352 and a 390 (block, crank, rods, intake, heads, etc) The reason I ask is because I just bought an engine from a friend and it was supposed to be a 1970ish 390, but the block says 352 
. If it is a 352, what can I do to turn it into a 390.
Oh, and where are the casting #'s located, they're not in the same place as my Windsor.
Thanks Eric
. If it is a 352, what can I do to turn it into a 390. Oh, and where are the casting #'s located, they're not in the same place as my Windsor.
Thanks Eric
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Check out the FAQ at tht top of this forum.
Most FE motors are labeled 352. you could very well have a 390. But, you could just as easily have a 360. They are all the same from the outside.
The 352 has a 4" bore and a 3.5" stroke
The 360 and 390 have a 4.05" bore
The 360 has teh same stroke as the 352- 3.5"
The 390 has a 3.78" stroke.
With the right rotating assemly you can build whatever you want.
you can see some lcations of casting numbers on this page..
http://www.thedreyerfamily.com/69f250/67f250/fe446.htm
Most FE motors are labeled 352. you could very well have a 390. But, you could just as easily have a 360. They are all the same from the outside.
The 352 has a 4" bore and a 3.5" stroke
The 360 and 390 have a 4.05" bore
The 360 has teh same stroke as the 352- 3.5"
The 390 has a 3.78" stroke.
With the right rotating assemly you can build whatever you want.
you can see some lcations of casting numbers on this page..
http://www.thedreyerfamily.com/69f250/67f250/fe446.htm
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Here's the easy way to check the stroke without removing the head. Get a straight 12 inch piece of white electrical house wire or coat hanger wire. Get a magic marker. Remove the number 1 and number 8 spark plugs. Turn the engine over until the timing mark is at TDC. (Because the old timing dampers sometimes will slip, the timing marks may be off. Make sure the engine is at TDC in the Number 1 hole by rotating the crankshaft back a forth a bit. Once you are sure it is at TDC, continue.) Put the wire in the number 1 spark plug hole with wire resting on the top of the piston. Make a mark on the wire even with the lip on the valve cover. Now move the wire over to the number 8 cylinder and mark the wire again, at the lip. Measure the distance between the two marks.
For those that don't know: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
For those that don't know: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
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Postmaster
Joined: Nov 2003
Posts: 3,568
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From: Middleton, ID
I'm pretty sure it's a 390; the casting #s say it's out of a 67 Merc. anyway it's going into my 70 so it doesn't matter what it was out of.
I can't complain for a $100.00, a big block is a big block.
I've already got the entire top end off so ill check bore and stroke that way. it's going to be a quick lil' truck...
Anybody know where a person can get a set of timing gears for and FE motor??
I can't complain for a $100.00, a big block is a big block.
I've already got the entire top end off so ill check bore and stroke that way. it's going to be a quick lil' truck...
Anybody know where a person can get a set of timing gears for and FE motor??
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 5
From: Albuquerque
Originally Posted by 1970Custom
I'm pretty sure it's a 390; the casting #s say it's out of a 67 Merc. anyway it's going into my 70 so it doesn't matter what it was out of.
I can't complain for a $100.00, a big block is a big block.
I've already got the entire top end off so ill check bore and stroke that way. it's going to be a quick lil' truck...
Anybody know where a person can get a set of timing gears for and FE motor??
I can't complain for a $100.00, a big block is a big block.
I've already got the entire top end off so ill check bore and stroke that way. it's going to be a quick lil' truck...
Anybody know where a person can get a set of timing gears for and FE motor??
www.edelbrock.com
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Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 5
From: Albuquerque
Originally Posted by banjopicker66
Here's the easy way to check the stroke without removing the head. Get a straight 12 inch piece of white electrical house wire or coat hanger wire. Get a magic marker. Remove the number 1 and number 8 spark plugs. Turn the engine over until the timing mark is at TDC. (Because the old timing dampers sometimes will slip, the timing marks may be off. Make sure the engine is at TDC in the Number 1 hole by rotating the crankshaft back a forth a bit. Once you are sure it is at TDC, continue.) Put the wire in the number 1 spark plug hole with wire resting on the top of the piston. Make a mark on the wire even with the lip on the valve cover. Now move the wire over to the number 8 cylinder and mark the wire again, at the lip. Measure the distance between the two marks.
For those that don't know: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
For those that don't know: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
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Postmaster
Joined: Apr 2002
Posts: 3,613
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From: Coal country
Why, Thank you biz!
I woul dlike to claim credit for it, but it isn't original with me. I got it many years ago from an old friend who had many, if not all, the popular engines from the '40s up to the early '70s figured out this way.
He has gone Home now, but he taught me much about wrenching.
Just passing it on down.
I woul dlike to claim credit for it, but it isn't original with me. I got it many years ago from an old friend who had many, if not all, the popular engines from the '40s up to the early '70s figured out this way.
He has gone Home now, but he taught me much about wrenching.
Just passing it on down.
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Originally Posted by 1970Custom
Okay thats a start, now I've got another question, where's the FE show its glory, your know performance, in what RPM range is it optimum???
That's a loaded question. It really depends on your build.
A stock truck 360 is a whole different animal than a modified 427.
Most FEs make good power at lower RPMs with mild to medium builds. You really have to open up the top end (cam, heads, valves) to get them moving enough air to make power in the higher revving range.
A general rule for mild to medium FEs. They make most of their torque by 3500 rpm and most of their HP by 5000 rpm. OK, I pulled those numbers out of thin air, but you get the idea.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
My stock internal 360 makes brutal torque down low, and pulls up to about 4500. That's where the stock cam runs out of wind. Put a good cam in it and the heads should be good for 5500. Flow through the heads is where the performance is, though.
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Postmaster
Joined: Nov 2003
Posts: 3,568
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From: Middleton, ID
Whats a good cam for this engine(390)??? It'll be somewhat of a driver, alot of drag racing, it'll have a standard behind it, head work is a must, good intake, and exhaust. I'm not woried about smooth idle, i'm a person who can sacrifice comfort for performance, and the only vaccume will be brakes and carb...Have I missed anything?
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Are you opposed to valve adjustment on a regular basis? There are some excellent solid lifter cams that are available. Also, are you opposed to spending $$$ on a roller cam setup?
With headwork, with ported stock heads and about 10.5:1 compression, here are my recommendations:
Hydraulic flat tappet: Crane 343941
Solid flat tappet: Crane 344361
Hydraulic roller: Crane 349521
Solid Roller: Crane 348801
Of all of the above, I recommend the Crane 348801. On DD2k it makes the most hp with a great torque curve. Any bigger in the crane solid roller line, you dont gain any hp and lose torque. Get some good flowing heads and that would change, though. Edit: MAKE SURE you beef up your valvetrain if you're going to use this cam, as it has .739" lift!!!!!
With headwork, with ported stock heads and about 10.5:1 compression, here are my recommendations:
Hydraulic flat tappet: Crane 343941
Solid flat tappet: Crane 344361
Hydraulic roller: Crane 349521
Solid Roller: Crane 348801
Of all of the above, I recommend the Crane 348801. On DD2k it makes the most hp with a great torque curve. Any bigger in the crane solid roller line, you dont gain any hp and lose torque. Get some good flowing heads and that would change, though. Edit: MAKE SURE you beef up your valvetrain if you're going to use this cam, as it has .739" lift!!!!!
Last edited by rusty70f100; Jul 11, 2004 at 07:44 PM.
Thread Starter
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Postmaster
Joined: Nov 2003
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From: Middleton, ID
Is that a cam that'll rattle windows if ran through open pipes??? (outta curiosity)Seriously, i'll take all that into concideration, and yes, it'll be beefed up from top to bottom. anything else to make a monster motor???
Also, are the pistons stamped with their designated engine size(,332, 352, 360, 390, 406, 410, 427, 428)? Because after taking a close look at the pistons, which are toast, it has 410 cast into the side of the pistion, close to the wrist pin.
Also, are the pistons stamped with their designated engine size(,332, 352, 360, 390, 406, 410, 427, 428)? Because after taking a close look at the pistons, which are toast, it has 410 cast into the side of the pistion, close to the wrist pin.