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Author Topic:   Opionion on Motor Combo
Dirt Roller

Total posts: 23
posted August 24, 2005 03:44 PM  
How well will this claimer motor hold up? 2 bolt 350 block. 383 Eagle Cast Steel crank. 6" Eagle SIR rod. Speedpro 6" Hollow Dome Pistons. Should make about 13-1 compression with ported Double Hump heads with a port matched 4 barrel intake. Carb will be a stock 350 Holley. Can the cast crank and SIR rod take the 13-1 compression?

Dirt Maniac

Total posts: 116
posted August 24, 2005 07:19 PM  
For a while no doubt. Just not for ever.

Dirt Maniac

Total posts: 137
posted August 24, 2005 07:33 PM  
Anything will live under a 350 carb.

But no v-8 will run with a "stock" 350 carb well.

The keith black silvolite claimer pistons are lighter than speed pros. Speed pro hypers are all solid dome.

Dirt Roller

Total posts: 7
posted August 24, 2005 09:10 PM  
i have pretty much that same combo i have about 25 nights on it

Dirt Forum Champ
Total posts: 874
posted August 24, 2005 11:19 PM  
Take care of it, keep good oil in it and run good filters and it'll last you a long time. The carb has little to no effect on how much a rotating assembly will take. You can run that assembly up to 7000 with no problems, but I suggest having the rotating assembly balanced by a reputable shop.

Dirt Freak

Total posts: 402
posted August 25, 2005 08:22 AM  
Not true. A restricive carb will prevent complete cylinder filling and reduce dynamic compression as well as RPM.

No need to run a 383. Even with 13:1 compression you carb limits the air flow to 5000 rpm. You can turn it more than that but you are losing VE. No point in building bigger than a bottom end that will live at 5000. I would go with a 358 or smaller with that carb and the same compression turning 6500 to 6800 with more gear.

Dirt Freak

Total posts: 370
posted August 25, 2005 09:04 AM  
I'd go to 15:1+ in smaller cubes.

Dirt Maniac

Total posts: 193
posted August 26, 2005 08:06 AM  
We have found that you need a longer stroke engine with the smaller carb. I would defenitley go with a 383. I think it would be a good motor. If I was you I would get a carb from KPlugnut. We have a guy running one at our track and he probably gets and extra 300-500 good RPM out of that carb. We don't like to turn our 400's over 6,000 RPM with the 350 cfm carb because we don't think it makes as much power. I know of a driver at our local track that turns his 6500. So it is just up to what you think and what feels the best for your gear, car and track combination.

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