Difference between 390 and 428
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Difference between 390 and 428
I'm not sure but have a hunch that the difference between the 390 and 428 is crank, pistons and cylinder heads. Please I would like to know because my next project vehicle is going to be a 69 mach 1 and I would like to put a 428 CJ under the hood.
Post Fiend
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From: Union, Washington
390 has a 4.05 bore and a 3.78 stroke, where as the 428 has a 4.13 bore and a 4.98 stroke. The externals on the blocks are identical and the stock 428s used 390 heads and cams. The 428s really worked better wiht the 427 hot rod stuff mainly because of the bigger inches.
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LOL...I hope theyour 428 doesn't have a 4.98 stroke!! I think you mean 3.98!!
Also if you are putting it in a Mustang you need GT heads with the dual bolt pattern.
Also if you are putting it in a Mustang you need GT heads with the dual bolt pattern.
Last edited by fomocofan; Jun 4, 2006 at 02:57 PM.
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
Originally Posted by fomocofan
LOL...I hope theyour 428 doesn't have a 4.98 stroke!! I think you mean 3.98!!
Also if you are putting it in a Mustang you need GT heads with the dual bolt pattern.
Also if you are putting it in a Mustang you need GT heads with the dual bolt pattern.
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I know, I guess I read his post wrong...We all make mistakes!
I was just saying if you put together a non CJ motor and you want to put it in a Mustang you need the GT style heads with the dual pattern because as you know, its the only way they will fit in a Stang..
I guess also it was directed at your comment that 390 and 428's were they same heads...As you know they are not always..as there are 390 and 390GT heads and 428 and 428PI/CJ heads.
And that there are different cam grinds for 390's and 428's.
I was just saying if you put together a non CJ motor and you want to put it in a Mustang you need the GT style heads with the dual pattern because as you know, its the only way they will fit in a Stang..
I guess also it was directed at your comment that 390 and 428's were they same heads...As you know they are not always..as there are 390 and 390GT heads and 428 and 428PI/CJ heads.
And that there are different cam grinds for 390's and 428's.
Last edited by fomocofan; Jun 4, 2006 at 03:13 PM.
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try ebay:
http://cgi.ebay.com/ebaymotors/Ford-...spagenameZWDVW
Or Edelbrock Aluminum heads
http://www.parts-pro.com/catalogpg/2...inderheads.pdf
http://cgi.ebay.com/ebaymotors/Ford-...spagenameZWDVW
Or Edelbrock Aluminum heads
http://www.parts-pro.com/catalogpg/2...inderheads.pdf
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Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by fomocofan
I know, I guess I read his post wrong...We all make mistakes!
I was just saying if you put together a non CJ motor and you want to put it in a Mustang you need the GT style heads with the dual pattern because as you know, its the only way they will fit in a Stang..
I guess also it was directed at your comment that 390 and 428's were they same heads...As you know they are not always..as there are 390 and 390GT heads and 428 and 428PI/CJ heads.
And that there are different cam grinds for 390's and 428's.
I was just saying if you put together a non CJ motor and you want to put it in a Mustang you need the GT style heads with the dual pattern because as you know, its the only way they will fit in a Stang..
I guess also it was directed at your comment that 390 and 428's were they same heads...As you know they are not always..as there are 390 and 390GT heads and 428 and 428PI/CJ heads.
And that there are different cam grinds for 390's and 428's.
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It all depends on what relatively stock means..
But assuming you still have stock pistons and cams...you would not benefit much from the improved flow and valve sizes...not only that, you may loose compression unless you change pistons or mill the heads.
However, if you go with Edelbrock Aluminum heads, you would atleast have a weight savings, but there are much better and cheaper ways to improve power.
But assuming you still have stock pistons and cams...you would not benefit much from the improved flow and valve sizes...not only that, you may loose compression unless you change pistons or mill the heads.
However, if you go with Edelbrock Aluminum heads, you would atleast have a weight savings, but there are much better and cheaper ways to improve power.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by fomocofan
It all depends on what relatively stock means..
But assuming you still have stock pistons and cams...you would not benefit much from the improved flow and valve sizes...not only that, you may loose compression unless you change pistons or mill the heads.
However, if you go with Edelbrock Aluminum heads, you would atleast have a weight savings, but there are much better and cheaper ways to improve power.
But assuming you still have stock pistons and cams...you would not benefit much from the improved flow and valve sizes...not only that, you may loose compression unless you change pistons or mill the heads.
However, if you go with Edelbrock Aluminum heads, you would atleast have a weight savings, but there are much better and cheaper ways to improve power.
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
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From: CT
www.ford428.com is a pretty new site that sells 428 parts. I've never dealt with them so i really don't know how they are. A good research and reading site is www.428cobrajet.org. Some original CJ parts are off the hook price wise so shop wisely. The aftermarket is thriving with good new parts if you don't have to have original parts. Sounds like a cool project....
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