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454 - 3999289 w/336781 heads

 
racer454k2500
I love my Chevy Chevette!
Posts: 5
Joined: 07/13
Posted: 07/04/13 08:37 PM

OK ,Fellow engine builders got the engine with no flywheel ,trying to find the right one . Need the 14 inch 168 teeth for my centerforce clutch . I am confused why do they sell several flywheels (external balanced ) that have various weights anywhere from 20 pounds to 33 pounds . Would you also have to get a matching harmonic balancer for the various flywheel weights . Trying to figure it out . Any help would be nice.  
Out with the 350 and in with the 454

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 07/05/13 03:17 PM

When I was racing some of the guys with heavier cars and smaller engines would go to a heavier flywheel because it would store more energy for a better launch.
Higher power lighter cars use the lighter flywheel for better acceleration due to less rotating weight.
I ran a aluminum flywheel in one of my race cars way back when.
The balancer and flywheel are balanced along with the rotating assembly. They are matched to that.  
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racer454k2500
I love my Chevy Chevette!
Posts: 5
Joined: 07/13
Posted: 07/05/13 07:23 PM

Thank you for the info. I am putting this 454 in my k2500 with a custom built brand new 5-speed (nv4500) I have set this truck up for street and strip.
  Do you think it would work to buy from Summit Racing a external balance flywheel and either leaving the existing front balancer or purchasing also the one Summitt may feel is a match for there flywheel. ?  
Out with the 350 and in with the 454

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 07/08/13 03:42 PM

Personally I had my rotating assemblies balanced with the flywheel and dampner. I never ran stock internals however. I believe most stock 454s were externally balanced. Check with Tuff on that, send him a PM as he knows those motors well. The stock dampner will suffice unless you are going heavy duty racing. If you are keeping the rpms down to 5500 or so you should be OK. If however you are going all out racing you will need an aftermarket balancer as they are required by racing organizations.
A 2500 is one heavy vehicle to go racing with I had one as a tow vehicle with the LS motor in it and it was almost 3 tons, 5700 lbs.
Here is a picture of one of my almost stock motors and the 2500:
MVC 025S 1MVC 023S 1  
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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 07/08/13 05:27 PM

+1 Dave, you summed it up nicely.,. variations in weight of F/W was determined by application and GVW of vehicle.,. lighter vehicles received lighter FW's.,. the balance weight, was proportionate (% wise) to the total weight respectively.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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