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350 rods in a 400 block

 
chevys4lyf
I love my Chevy Chevette!
Posts: 2
Joined: 06/10
Posted: 06/23/10 01:54 AM

hey people new to all this hope someone out there can help just had my 400 small block bored 30 thou at our local shop. blocks in great shape the owner has recommended using 350 rods with pistons to suit I will be running factory crank and heads in the meantime till more bucks fall from the sky with a edelbrock performer manifold carb to suit.I have a new 600 demon carb in my shed.The engine is for my 64 malibu ss with a 4 speed muncie behind.what do you think guys possabilities or dodgy any help would be great.  

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ethelkilledfred-#001
I mow my lawn and find Chevys
Posts: 1371
Joined: 03/10
Posted: 06/23/10 02:16 AM

Icon Quotechevys4lyf:
hey people new to all this hope someone out there can help just had my 400 small block bored 30 thou at our local shop. blocks in great shape the owner has recommended using 350 rods with pistons to suit I will be running factory crank and heads in the meantime till more bucks fall from the sky with a edelbrock performer manifold carb to suit.I have a new 600 demon carb in my shed.The engine is for my 64 malibu ss with a 4 speed muncie behind.what do you think guys possabilities or dodgy any help would be great.

Use rods with cap screws instead of rod bolts. When you use these style of rod, you get lucky sometimes and don't have to clearence a block when building a 400 with 350 5.7 rods, otherwise you may have to grind the block to clear the oil rail and the rods to clear the cam.

Rods with rod bolts
Sme 3 48 05 100

Rods with cap screws
Rod 04LRG

Rod 01LRG  
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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 06/23/10 07:57 AM

+1
Yup
Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1760
Joined: 08/09
Posted: 06/23/10 08:40 AM

yup there will be less side loading on the pistons with the longer rod.  
p2-72chevelle383

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chevys4lyf
I love my Chevy Chevette!
Posts: 2
Joined: 06/10
Posted: 06/23/10 10:59 PM

thanks guys appreciate the help  

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zachsylvester424
I love my Chevy Chevette!
Posts: 2
Joined: 05/14
Posted: 05/04/14 04:32 PM

im pretty sure 350 rods are shorter... so the 400 will than be 377 destroked 400 for added rpm and the same displacement as the 400 nearly. just with way more R's  

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 05/04/14 10:35 PM

I believe the 400 rod is shorter.
You would have to get a custom piston with the pin located higher
on the piston to use the 350 rod. There would be no change
in the stroke length so you would still have 400 inches if
the bore stays the same.  
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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 05/05/14 07:37 AM

+1 Dave.,. the 400 rod is shorter 5.565" and the 350 rod is 5.7"

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 05/06/14 06:58 AM

Another misconception is that rpms are decided by stroke length. While it does have some effect, rpms are far more effected by valve train ability. I ran my 4 & 3/4 inch stroke 632s up to and above 7000 rpms with no ill effect. Good rotating assemblies are needed for this along with some healthy valve train components.  
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