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Anybody use forged 6.4 crank in 5.7? #2697430
09/14/19 11:52 AM
09/14/19 11:52 AM
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer Offline OP
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tpabayflyer  Offline OP
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Tampa, FL
What pistons did you use? I picked up a complete BGE engine for a 426 stroker
And was very surprised to see the original crank is a very nice piece and forged? I want to
Use the stock 6.200 powdered metal rods and need a nice forged piston with a compression height
To give me a zero deck around 11-1 C/R...... looks like this is an easy way to make a stout 370 cube
Engine???


71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
Re: Anybody use forged 6.4 crank in 5.7? [Re: tpabayflyer] #2697488
09/14/19 02:17 PM
09/14/19 02:17 PM
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Posts: 194
Springtown Pa
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Ray408G3Hemi Offline
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Springtown Pa
to use the 6.4 crank and the stock 6.4 rods you would need a custom piston with a pin height of 1.187(take into account the clearance taken up by oil film when the engine is running) no one makes an off the shelf piston with that height.

Edit ....Icon has a piston IC649C-0015(3.3 Dish)IC650C-0015(13.7 dome)IC648C-0015(17cc dish) which is a pin height of 1.165 , so you are looking at -.025 below deck with a 9.25 block height..issue is the 6.2 stock rods are .945(or.984, I'm not sure) pin dia and these icon pistons are a .927 pin Dia




Now here's a combo that I've seen my builder do a few times.
Eagle Block
6.4 Crank, Rod Journals turned down to 2.10
Compstar rods CSA6300DS2A2AH. 6.30 C to C with .927 pin.
Icon pistons IC653C-0015 , 3.9185 bore ,8.7 cc dome, 1.09 Pin height.
Cometic Head Gaskets C5467-060
this is a true 0 deck height with a 9.25 blue print block, once clearance slack is taken up by oil film in a running engine the pistons will be about .0025-.003 above the deck.
Makes 12.0 to 1 with Eagle heads
358.9ci
Stock Eagle heads, SRT392 Non MDS Edelbrock intake. 90mm TB
Made 498 Hp @6100 and 510tq @ 4300. with F.A.S.T ignition system. using a 6.1 32 tooth tone wheel.



Last edited by Ray408G3Hemi; 09/14/19 02:24 PM.

1963 Thunderbolt 496FE 10.80 (still a work in progress)
1968 Mustang slow a$$ 428 FE
1971 Boss 351 Mustang 11.20@115mph
1993 Lightning 10.61 @ 129mph 408Ci A3 headed NA
1996 Viper GTS
2001 Lightning 8.99 @ 155MPH 5.4 Mod Motor
2009 Ram 9.65@144MPH 463CI G3 NA
2010 Challenger 9.91 @ 139MPH 408CI G3ci NA
2019 F150 (local dealer's Lightning package) ..11.90s

Re: Anybody use forged 6.4 crank in 5.7? [Re: Ray408G3Hemi] #2697491
09/14/19 02:28 PM
09/14/19 02:28 PM
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Posts: 12,406
Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
Take a 4.09 bore 392 and bore it to 4.125 and open the end of the rod up to chevy size and you open up a plethora of 400 SBC piston choices. A true flat top with no valve reliefs would make good compression and you would be over 400 CID. Or better yet turn your crank down to 2.0 chevy journals, buy cheap chevy rods and a flat top 400 SBC piston and get even bigger by offseting the 3.75 stroke to about 3.87 with the 4.125 bore to come out around 414 CID. If you really want to do it in the 5.7 block I think you could find an LS piston and do all the same "chevyizing"end up around 380 depending on exact bore you settle at.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Anybody use forged 6.4 crank in 5.7? [Re: Ray408G3Hemi] #2697510
09/14/19 03:27 PM
09/14/19 03:27 PM
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer Offline OP
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tpabayflyer  Offline OP
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Posts: 1,586
Tampa, FL
Ok thanks guys..... the 392 crank will be going into an eagle 5.7 block so the pistons need to be 3.917 plus overbore
...... I’m just thinking there could be a low cost option to use this crank in a 5.7 block as it’s really a pretty nice
And stout looking forged piece..... 500HP is pretty damn respectable from 360 Cubes.....


71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
Re: Anybody use forged 6.4 crank in 5.7? [Re: tpabayflyer] #2697647
09/14/19 11:43 PM
09/14/19 11:43 PM
Joined: Nov 2006
Posts: 2,252
IL
furious70 Offline
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Why wouldn't you just use the whole BGE as the starting point, am I missing something?


70 Sport Fury
68 Charger
69 Coronet
72 RR
Re: Anybody use forged 6.4 crank in 5.7? [Re: furious70] #2697649
09/15/19 12:06 AM
09/15/19 12:06 AM
Joined: Nov 2003
Posts: 1,874
Pittsburgh,PA
RTSrunner Offline
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Pittsburgh,PA
[quote=furious70]Why wouldn't you just use the whole BGE as the starting point, am I missing something? [/quote

Looks like he is stroking the 6.4 and will have the stock crank leftover & looking to recycle it into another engine.

Re: Anybody use forged 6.4 crank in 5.7? [Re: RTSrunner] #2697699
09/15/19 10:04 AM
09/15/19 10:04 AM
Joined: Nov 2006
Posts: 2,252
IL
furious70 Offline
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ah, misread that, thought he bought the 6.4 just for the crank to make a stroker of a 5.7, doh!


70 Sport Fury
68 Charger
69 Coronet
72 RR
Re: Anybody use forged 6.4 crank in 5.7? [Re: furious70] #2697796
09/15/19 03:52 PM
09/15/19 03:52 PM
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer Offline OP
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tpabayflyer  Offline OP
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Joined: Jan 2003
Posts: 1,586
Tampa, FL
Upon tearing down the BGE engine, I was surprised to see a very nice
Forged crank.... I thought that plus a nice set of forgedpistons would make a stout foundation
For building the 5.7 coming out of my Jeep.... it will be an extra engine to have ...... yes, the BGE block and heads as well as the active intake will be used For a 426 stroker for my Jeep..... the heads are made from 356 aluminum and the ports are super smooth and huge.... the stock guide bosses look as if they were already ported but are as cast...... best set of stock heads I have ever seen....


71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
Re: Anybody use forged 6.4 crank in 5.7? [Re: tpabayflyer] #2697950
09/16/19 06:57 AM
09/16/19 06:57 AM
Joined: Nov 2003
Posts: 1,825
NW Indiana
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fbs63 Offline
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NW Indiana
CP Bullet series pistons. They have a flat top piston, pin and ring package for that combo.

Re: Anybody use forged 6.4 crank in 5.7? [Re: fbs63] #2698225
09/16/19 09:32 PM
09/16/19 09:32 PM
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer Offline OP
pro stock
tpabayflyer  Offline OP
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Joined: Jan 2003
Posts: 1,586
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up up up


71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!






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