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Old 08-02-2003, 08:00 PM
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402 block with 454 crank

I am looking for a little advice from someone who knows more than me. Will a crank from a 454 work in my 402 with out to many problems or machine work? If anyone out there knows can you please let me know! THANKS

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Last edited by stoneyone2001; 08-02-2003 at 08:31 PM.
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Old 08-02-2003, 09:51 PM
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you can put a 454 crank in a 396-402 block, but you can't buy resonably priced pistons for the combination! also you will have to grind the block for rod clearance, it's even getting hard to buy off the shelf forged hi-perf pistons for 396-427 stock rod motors, most of the piston companies are just producing the 454 pistons and telling the few that run 427 style motors to use a .250 longer rod and 454 pistons.
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Old 08-04-2003, 05:45 PM
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Actually a 427 with a .250" longer rod would use the same size piston as a 4.25" stroker combo with a stock rod.That is how I built my 440 incher.4.310x3.76 with 6.385" rods and pistons for a 496 stroker.You might be able to have a set of custom flat tops made for a fair price,but domes will be expensive.I ordred a set of weisco custom pistons for a 555 a while back and they retailed for $900 but they will sell them to you for about $600 if you call them direct and tell them your story.Good luck.
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Old 08-04-2003, 08:18 PM
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But you were using a 4.250+ oversize bore, most 402's won't go that big without cylinder wall problems, the man is looking for 4.125 bore pistons ,long rod , 4.25 stroke, AINT ANY= non available=unless custom ordered.
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Old 08-05-2003, 05:19 PM
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He might be able to do something with a 400 smallblock piston especially if he wants a flat top.He needs to figure out the deck height he needs,maybe figure out a few differnt combo with different length rods and then comb the piston catalogs for a piston that will be close to what he needs,he may have to make up the last few thousandths by decking the piston or block,or offset grinding the crank,but it may be doable without a lot of trick stuff.A stock 454 piston needs to be about 1.665" in deck height,with a stock rod,and as short as 1.265" with a .400"longer rod,and there is a .250"longer rod in between the two.You can deck the block up to about .060" to get the piston to the top of the deck,and many pistons can be milled a similar amount to bring them back into the deck if they are to high,and then you can even buy head gaskets as thick as .080" thick if a milled piston is still too high.So in reality you can take a piston that is as much as .125" too tall and still make it work if you needed to,if you were willing to mill the piston a bit and run extra thick head gaskets.So if you were really pressed to make it work,a 396 flat top piston such as a trw replacement piston which normally sits .020" in the deck could be milled .060",and run with .080" thick head gaskets and be close to fitting.Another slick trick you can pull would be to ask the machine shop to oversize the rds about .060" shorter by milling the heck out of the caps and offsetting the holes in the rods.If you know a good machinist you can bogger something up on the lowbuck,or you culd just get a 454 block and be done with it.Back before everybody and their brother made stroker pistons this is how it was done.
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Old 08-05-2003, 08:24 PM
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You could use a KB361 with the stock rods and a 454 crank in a 396 block. That's what the application is for. If the Hypereutectic isn't enough, and you need a forged piston, you might look into a custom rod length and an off the shelf piston. Or, I'm afraid you are looking at a custom forged piston. Dan
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Old 10-22-2013, 09:38 AM
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I too, have been trying to find info on stroking a 396. The question I can't seem to find an answer to is: Can I use a 454 crank with stock rods and pistons? I know I'd need to clearance the block for rods probably but is it possible? I'm looking for low end torque in my 1983 K10. Thanks!
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Old 10-22-2013, 10:43 AM
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Quote:
Originally Posted by 1989toddm View Post
I too, have been trying to find info on stroking a 396. The question I can't seem to find an answer to is: Can I use a 454 crank with stock rods and pistons? I know I'd need to clearance the block for rods probably but is it possible? I'm looking for low end torque in my 1983 K10. Thanks!
No. The longer stroke requires a piston with a shorter compression height than the 396 piston. If you put a 396/402 piston and rod on a 4.000" crank, you will push the piston out of the bore by 0.120" (roughly an eighth of an inch).
3.760" stroke requires a piston with ~1.765" compression height.
4.000" stroke requires a piston with ~1.645" compression height.

Here's the KB361 that was mentioned by Ohio Dan back in 2003.....
https://www.uempistons.com/index.php...roducts_id=502
At $485, I'd say they are quite the bargain if your application can use hypereutectic pistons.
11.1:1 SCR with 96.5cc chambers
10.2:1 SCR with 105cc chambers
9.0:1 SCR with 119cc chambers

Last edited by techinspector1; 10-22-2013 at 11:05 AM.
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Old 10-22-2013, 12:14 PM
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Thank you techinspector! Those pistons require an over bore, correct? I am hoping to get by with a DIY hone job to keep cost down. Not looking for a monster engine but trying to find out what I can get in torque numbers from idle to 4000rpm. I have limited funds-$1000 max.
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Old 10-22-2013, 01:00 PM
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Pistons require a 4.125" bore in standard size. You will probably have to order a std. size piston set. As very few of these are stocked. Your 396 will need to go to 402 bore size. 4.125"
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Old 10-22-2013, 01:50 PM
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Ok that answers that question. Now why would I not be able to use hypereutectic pistons?
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Old 10-22-2013, 02:01 PM
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Quote:
Originally Posted by 1989toddm View Post
Ok that answers that question. Now why would I not be able to use hypereutectic pistons?
They're cast pistons, albeit with an overload of silicon, which makes them a little tougher than regular cast pistons with less silicon, but not as tough as forged pistons. You also need to look at the alloy the piston is made from. Hypers will work fine for street or street/strip in my opinion, but I wouldn't use them in a blower motor that will see high boost, for instance and I wouldn't use them in a high-rpm application.

Yeah, yeah, I know some of you will pony up with something like this.....
"I run hypers in my 350 Chevy, 20 lbs of boost and taching 9500 and never suffered a loss due to piston failure".
Then someone else will come along and say.....
"I rebuilt grandma's 307 Nova with hypers and they all cracked. She only drives the car to and from Bingo."

There are exceptions to every rule.

Read everything the manufacturer has published about the piston you wish to use. If you still have questions, call the manufacturer and talk with one of their technical people. Posing a question on a forum like this will get you different points of view from different builders, but when push comes to shove, nothing beats talking with the maker of the parts.

Last edited by techinspector1; 10-22-2013 at 02:08 PM.
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Old 10-22-2013, 02:02 PM
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Quote:
Originally Posted by 1989toddm View Post
Ok that answers that question. Now why would I not be able to use hypereutectic pistons?
I see no reason why a hyper piston would be a problem in a street engine.
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Old 10-22-2013, 03:15 PM
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You will get more of the effect you are looking for by changing the rear gear ratio in the truck rather than changing the crank stroke. Especially if the tires are now taller than stock.

If you want more low end grunt, put some gears in it.
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Old 10-22-2013, 03:18 PM
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Or... just drop in a running 454.
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