What's the differences between the 427, 428, and 429? - Ford Mustang Forum
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post #1 of 7 (permalink) Old 09-21-2008 Thread Starter
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What's the differences between the 427, 428, and 429?

I've justbeen wondering, besides the fact that the 428 was the SCJ, and the 429 was the HEMI, what's the difference between the short blocks to get a 427, a 428, and a 429? Is there a difference, or were the different engines just given different displacement labels to avoid confusion?
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post #2 of 7 (permalink) Old 09-21-2008
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The 427 & 428 were FE engines, these were an early big block from Ford. There were slight differences in bore and stroke between the two. If I remember correctly the 427 was a little longer stroke and the 428 was a shorter stroke with a larger bore. The 429 was the new big block from Ford along with the 460 that came later. There was only a very limited number of Boss 429's which were the Hemi headed engine, most were a wedge combustion chamber.

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post #3 of 7 (permalink) Old 09-21-2008
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i had always had a love for the FE Motors

i found this great info.....

Ford FE engine
post #4 of 7 (permalink) Old 09-21-2008
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The 390-428 is a fe the 429 is a 385 series the hemi head one was the boss 429 with shared nothing with the normal 429.The 429 came many ways a normal one a thunderjet in the thunderbird a cobra jet and a super cobra jet which is the j code drag package in 71.The 429scj was rated 375hp 450 foot pounds but those numbers are way under rated.On the fe as far as i know the 390 427 428 all the same block but both big blocks are pricey to make any power with.You can build a stroker small block 427 or even a 460 world makes them there about the same price as a big block of the same ci and power but weight less.
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post #5 of 7 (permalink) Old 09-22-2008
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The 427 had a bigger bore and shorter stroke than the 428. The 429 was a whole different animal than the 390, 427, or 428. The 429 also came as a thunderjet, in the t birds, 429cj, 429scj, and the boss.
The 390, 427, 428 blocks were cast based off the 352 block. The 427 though had 4 bolt mains. They were cross bolted meaning 2 of the bolts went through the side of the block for extra bottom end strength. Some 427's were also referred to as side oiler blocks. they had an oil galley along the side of the block to oil the mains directly. All these engines had different top end packages. The 427sohc was fords only true hemi at that time period.
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post #6 of 7 (permalink) Old 09-22-2008
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Ford also offered a 406 FE engine in 1962, 1963 and some of them were cross bolted also, which some people have mistaken for a 427. I use to race the 428scj, and 427 medium riser, back in the late 70's. I have tech sheets and articles of some of the muscle car engines of that time period if You would like some more info. on these engines.
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post #7 of 7 (permalink) Old 06-29-2013
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Im 18 and im getting a 68 289 coupe stang. Is there anything that you would be willing to teach me?? I know makes and models...but when it come to the stuff i oughta to know i uhuh..i dont..anyways if You cOuld help me that would be great.
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