352 to 390
Elder User
Joined: Feb 2002
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From: Middleton, WI
Re: 352 to 390
Originally posted by seans64'
im gonna be rebuilding my 352 and want to stroke it to a 390..can anyone possibly show me some information needed to complete this build.
thanks, sean
im gonna be rebuilding my 352 and want to stroke it to a 390..can anyone possibly show me some information needed to complete this build.
thanks, sean
Good Luck
New User
Joined: Nov 2003
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From: Reidsille
If your looking to save a little money, your 352 rods are the same measurements as any other FE series rods (apart from cap bolt/screw sizes on the 427 and special engines like PI and CJ/SCJ). If you get your old ones checked over and they are good they will work just fine.
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
Originally posted by n2ovals
If your looking to save a little money, your 352 rods are the same measurements as any other FE series rods (apart from cap bolt/screw sizes on the 427 and special engines like PI and CJ/SCJ). If you get your old ones checked over and they are good they will work just fine.
If your looking to save a little money, your 352 rods are the same measurements as any other FE series rods (apart from cap bolt/screw sizes on the 427 and special engines like PI and CJ/SCJ). If you get your old ones checked over and they are good they will work just fine.
If you use the short rods and pistons with a 1.776" compression height, you'll end up with .016" deck clearance.
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From: Sacramento,Ca
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Post Fiend
Joined: Jan 2003
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From: Iowa
TRW L2291F pistons are forged and should work good. Go to www.summitracing.com and search for TRW-L2291F. You will need to use short rods if you use these, though. I would suggest a Crane Cams 343941 hydraulic cam, with their matching valvetrain components, especially the springs.
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Joined: Nov 2003
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From: Reidsille
Originally posted by rusty70f100
They are not the same size. Long rods, used in the 352, 360, and 361, are 6.54". Short rods, used in the 390, 410, 427, and 428, are 6.49". Long rods will work in a 390, but they aren't as strong as short rods, and should not be used if you're going over 5000 rpm. With a 390 crank, long rods, and 390 pistons, you'll end up with a deck clearance of .062". Just make sure you use pistons with a compression height of 1.680", not the 1.776" used with most 360 pistons. Obviously you'll need new pistons after a .050" overbore, so just check the compression height before you get 'em. If they're 1.680" compression height, you can use long rods. If they're 1.776", use short rods.
If you use the short rods and pistons with a 1.776" compression height, you'll end up with .016" deck clearance.
They are not the same size. Long rods, used in the 352, 360, and 361, are 6.54". Short rods, used in the 390, 410, 427, and 428, are 6.49". Long rods will work in a 390, but they aren't as strong as short rods, and should not be used if you're going over 5000 rpm. With a 390 crank, long rods, and 390 pistons, you'll end up with a deck clearance of .062". Just make sure you use pistons with a compression height of 1.680", not the 1.776" used with most 360 pistons. Obviously you'll need new pistons after a .050" overbore, so just check the compression height before you get 'em. If they're 1.680" compression height, you can use long rods. If they're 1.776", use short rods.
If you use the short rods and pistons with a 1.776" compression height, you'll end up with .016" deck clearance.
Y'know, Rusty, I was looking right at the chart (out of "Ford Power") and still misread it. Oops!
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
It depends on a number of things. It depends on what you're starting with, and the shift. When they originally bored the cylinders at the factory, sometimes they were shifted a little bit to one side or the other. The floating wrist pins compensated. But this made the cylinder wall thicker on one side than the other. The more of this, the less the overbore you can get.
If you're starting with a 4.05" bore 360/390 block, I'd say .060" is about as far as you want to go without having it checked. If you have it checked, I'd say you wont go much beyond .080", although this does take it up to 428 dimensions.
If you're starting with a 4.23" bore 427 block, you cannot go past .030". If you have a 427 block bored to .030" over, and a cylinder needs boring again, IT MUST BE SLEEVED!
However, there are places that can remove the cylinder walls, actually bore the block larger, and install larger cylinders in the block. However, this process is VERY expensive. I know this is done to get some 4.6L modular engines up to 324ci with stroking. A company called VTengines sells them, I'm not sure if they make them or not. They're at www.vtengines.com
If you're starting with a 4.05" bore 360/390 block, I'd say .060" is about as far as you want to go without having it checked. If you have it checked, I'd say you wont go much beyond .080", although this does take it up to 428 dimensions.
If you're starting with a 4.23" bore 427 block, you cannot go past .030". If you have a 427 block bored to .030" over, and a cylinder needs boring again, IT MUST BE SLEEVED!
However, there are places that can remove the cylinder walls, actually bore the block larger, and install larger cylinders in the block. However, this process is VERY expensive. I know this is done to get some 4.6L modular engines up to 324ci with stroking. A company called VTengines sells them, I'm not sure if they make them or not. They're at www.vtengines.com
Cargo Master
Joined: Jul 2003
Posts: 2,328
Likes: 14
From: Colorado
I just got my 352 bored over .030 I got a 390 crank I just put in today. I guess that .020 short of .050 won't ever make a difference that'll I notice. I'll still me smoking ricers no matter what!
My 352 block says "32 352" right on the front of it. I wonder if mine is one of those blocks that can't be bored far like CACWBY was saying????
My 352 block says "32 352" right on the front of it. I wonder if mine is one of those blocks that can't be bored far like CACWBY was saying????
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
Originally posted by rusty70f100
It depends on a number of things. It depends on what you're starting with, and the shift. When they originally bored the cylinders at the factory, sometimes they were shifted a little bit to one side or the other. The floating wrist pins compensated. But this made the cylinder wall thicker on one side than the other. The more of this, the less the overbore you can get.
It depends on a number of things. It depends on what you're starting with, and the shift. When they originally bored the cylinders at the factory, sometimes they were shifted a little bit to one side or the other. The floating wrist pins compensated. But this made the cylinder wall thicker on one side than the other. The more of this, the less the overbore you can get.