PISTON SWAP 400
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From: New England
PISTON SWAP 400
I have a 1977 400 its a rebuilt with 4-5K on it, I want to put some 10:1 pistons in it, will I have to have the crank reground etc etc ?? I was thinking I should just lift the engine , pull the oil pan, heads, and just loosen rod bolts etc... also , would I need to put new rings???
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77'FORD F150 XLT 400
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77'FORD F150 XLT 400
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From: (near) Denver USA
PISTON SWAP 400
[font size="1" color="#FF0000"]LAST EDITED ON 12-Mar-01 AT 12:09 PM (EST)[/font][p]fozzy,
No need to regrind the crank unless there's something wrong with it now. If you have it ground, you'll need to replace the bearings on the ground journals to maintain correct clearance.
You could change the pistons using the method you describe, but it would be a heck of a lot easier with the engine on a stand.
If you change the pistons, you should use new rings recommended by the piston manufacturer for your pistons.
About those Badger pistons, they are really only 9.0-9.1:1. See my other reply on the "performance 400" topic.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
No need to regrind the crank unless there's something wrong with it now. If you have it ground, you'll need to replace the bearings on the ground journals to maintain correct clearance.
You could change the pistons using the method you describe, but it would be a heck of a lot easier with the engine on a stand.
If you change the pistons, you should use new rings recommended by the piston manufacturer for your pistons.
About those Badger pistons, they are really only 9.0-9.1:1. See my other reply on the "performance 400" topic.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
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Joined: Sep 2001
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From: Jax FL
PISTON SWAP 400
to get 10:1 you have a lot of reasearch to do. first the cheapest way is get 351c pistons and bush the connecting rods. get a cr calulator, the deck height on a 400 is .0565 that is rather large and will eat up the cr of all pistons, a 351c piston will lose cr if put in a 400. buy some books on ford perfromance and swaping of parts. or you can have custom pistons made for a large fee
Tuned
Joined: Jun 2001
Posts: 266
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PISTON SWAP 400
to get 10:1 you have a lot of reasearch to do. first the cheapest way is get 351c pistons and bush the connecting rods. get a cr calulator, the deck height on a 400 is .0565 that is rather large and will eat up the cr of all pistons, a 351c piston will lose cr if put in a 400. buy some books on ford perfromance and swaping of parts. or you can have custom pistons made for a large fee
Tom
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