429 to 460
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Laughing Gas
Joined: Jul 2000
Posts: 851
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From: Elkton, MD
429 to 460
Can you put a 460 crank and rods in a 429 block and turn it into a 460, do you use 460 pistons also? Does this change the compression ratio any, will the valves hit the pistons? I plan on putting in an edelbrock performer RPM cam and intake and 750 carb. Thanks for any help
Senior User
Joined: Nov 2000
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429 to 460
Yes the dampers are essentially the same for both the 429 & 460, so you could use a 429 balancer with a 460 crank and vice/versa. This can also be said for the flexplate. If you want to use a 460 balancer and flexplate, make certain of the year of the crankshaft, because beginning in '79 they switched from internally balancing a 460 to external balance. Ford used a different type of harmonic balancer and flexplate than were used previously. '68-'78 460 cranks start with the number 2 as in 2Y, 2YA, 2YAB, 2YABC. '79 and later cranks start with the number 3 as in 3Y and so on. The casting #'s are on the side of the front crankshaft "throw". I hope this helps.
BB79RANCH
BB79RANCH
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Joined: Nov 2000
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429 to 460
Whats the story on the 460/429 piston differences? Are there different pin heights?
I'm about order the Motorsport 514 stroker kit from my '70 Boss 429 but want to retain the existing pistons. They are custom forged pop-ups for my bore size.
Thanks
I'm about order the Motorsport 514 stroker kit from my '70 Boss 429 but want to retain the existing pistons. They are custom forged pop-ups for my bore size.
Thanks
Senior User
Joined: Nov 2000
Posts: 231
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429 to 460
The pistons are different for a 429 & a 460. The piston compression heights (the distance between the piston pin center line and the top of the piston) are the difference. The 429's distance is 1.890 and the 460's is 1.756. They will interchange on the same con rod, but you would have either a piston that is sticking up above the deck height (using a 460 piston with a 429 crank) or a real low compression motor (using a 429 piston with a 460 crank).
I believe you won't be able to use the pistons you already have for two reasons.
They overbore your engine block to 4.440 inches (.080" over, Ya better have it sonic checked) and they offset grind a 460's crankshaft on the con rod journals in order to increase the stroke (4.150 compared to a stock 429 at 3.59 or a 460 at 3.85) to accept big block Chevy style rods, but there are other combinations out there as well. I know it's been said that a 429-460 block can safely be bored to only .030" over , but I've seen a few BBF's built with larger over bores than .030" and haven't had any problems. I hope this helps in any way.
BB79RANCH
I believe you won't be able to use the pistons you already have for two reasons.
They overbore your engine block to 4.440 inches (.080" over, Ya better have it sonic checked) and they offset grind a 460's crankshaft on the con rod journals in order to increase the stroke (4.150 compared to a stock 429 at 3.59 or a 460 at 3.85) to accept big block Chevy style rods, but there are other combinations out there as well. I know it's been said that a 429-460 block can safely be bored to only .030" over , but I've seen a few BBF's built with larger over bores than .030" and haven't had any problems. I hope this helps in any way.
BB79RANCH
Senior User
Joined: Nov 2000
Posts: 231
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429 to 460
Please excuse the wording error on my last e-mail, it should have read that if you use a 460 piston with a 429's crankshaft then you would have a low compression engine and if you used a 429's piston with a 460 crankshaft the piston would be above deck height. I'm sorry about the error!!!
BB79RANCH
BB79RANCH
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Laughing Gas
Joined: Jul 2000
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From: Elkton, MD
429 to 460
Has anyone ever used the crank kits from PAW? They come with crank, rods, pistons, rings and bearings, I was thinking about using one of these, any luck with them?
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