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new motor for southern sportmod need help

 
klm2420
I love my Chevy Chevette!
Posts: 1
Joined: 10/12
Posted: 10/25/12 05:59 PM

hello well its time to build the new motor for next year and wanted to get some advice we ran a 358 this year and a 355 our rules r any flattop  and i beam rods with nuts and stock heads or eq heads 4412 carb solid cam 175lbs its for a mid banked 1/4 mile dirt track i was thinking about a 327 or a 307 and put some more gear under it and turn some rpms any help do donts combos etc thanks alot. would like to build a good solid motor that last.  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 10/25/12 06:36 PM

If it's rpm you want and have the parts handy why not go with a 400 block, 3.25 stroke, it comes in around 350 cubic inches. Short stroke, willing to rev, and the big bore to suck in lots of air.

JM $0.02  
68scott385 68scott385 68scott385

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 10/25/12 07:11 PM

Icon Quote68scott385:
If it'd rpm you want and have the parts handy why not go with a 400 block, 3.25 stroke, it comes in around 350 cubic inches. Short stroke, willing to rev, and the big bore to suck in lots of air.

JM $0.02


+1
That sounds like a winner to me. Gear it up higher to take advantage of the
higher revving motor and powerband.  
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redneckjoe69
I mow my lawn and find Chevys
Posts: 2337
Joined: 03/10
Posted: 10/25/12 07:15 PM

is it a claimer series?    

  if you want rpms,...id beef up the valvetrain.     more gear always gets more RPMs too.  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 10/25/12 07:23 PM

The old Smokey Yunick way of doing things. The rules always limited the maximum size cubic inches, but never on the Smaller end of the spectrum. Then he started running away from the other engine combinations. That's when NASCAR started with MIN. and MAX engine sizes.
  You just want to keep a 4"+ bore so you can stick a decent size cylinder head on top. OKAY... With that said. A 331 Cubic Inch small block. You still have all the room to make mods.
  I ran a Grumpy Jenkins old Pro Stock engine 331 Cubic Inch engine in my ChevyII for many years. The only draw back to building a short stroke engine is that it needs be fed at high RPM.I ran a Tunnel Ram, I was spinning my 331 on a good run 9500RPM on the big end.
  Anyway if your planning on a small Cube engine stay away from the 307. Unless you want to build a 318 Cubic inch small block. You will need to play with crank strokes and rod lengths. Some which can hinder the performance. Because of strange rod angles. Lunati will cut you any Crank and rod combination. Today the choices are endless. A 1/4 mile dirt track you will be turning some RPM thats why your using a SBC engine, and not a Ford or MoPar. You didn't mention what type trans either.
  Just remember the longer the stroke the easier it will be to get off the corners and keep the R/Rear tire planted. Good Luck

Bob  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 10/25/12 07:25 PM

welcome to CHP kim2420:  

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