Should be, the only difference between a 401 and a 425 is the diameter of the bore. Deck height is the same so I would think that the dipsticks should be interchangable. Someone with a parts book will have to answer this one as factual.
Ed
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Ed Raner
ROA #279
Heartland Regional Coordinator (Kansas City area)
1963 Riviera - Black w/ white leather
1964 Riviera mild custom
1985 Riviera - Dark Blue (stealth mode)
Some days you might have to be the statue, but other days you get to be the pigeon.