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Author Topic:   short block chevy street stock motor ?'s
Dirt Full Roller

Total posts: 32
posted September 14, 2001 09:04 AM
I'm building a new 350 Chevy Street Stock motor and am looking for input. In the end, I want an honest 425hp and I want to be able to turn 6500 rpm comfortably. I had my last motor built for me and was kinda unimpressed, so I'm tackling this one myself.
I've assembled street motors before, but all I know about this engine is that I want forged pistons. I have a '69 4-bolt block. What should I use for rods? Do I need a forged crankshaft or can I reuse the stock one? Dependabilty is of foremost importance.

Also, the heads will be cast iron Dart II's with a solid lifter cam. I will probably run out of money before I can port and polish the heads, so they'll be "as-cast". Any advice on a cam selection? The track is 1/4 mile, moderately banked. One set of turns is pretty tight, so I need a good amount of low end to get off those turns. The other set is pretty big (its the dirt Darlington of Illinois). The rmp range will probably be between 4000 and 6500. I know there's a ton of questions here, but I wanted to give all the info in one place. Thanks.

Dirt Forum Racer

Total posts: 95
posted September 15, 2001 10:07 PM
First off I would say if its on a budget you need to save as much weight in the piston area as possible. First spend money on some forged light weight pistons, and possible alot more than most on pins. Second you can probably make due with a nice Scat cast crank if you save enough weight in the pistons. The wings of the Scat decrease windage and they are very affordable. If you have a flat-top rule, spend money to get the Dart angle milled increasing compression. If your turning 6500 rpm's you might gain from the Scat 6" rods as well. If you save enough weight, and you don't zing too much it'll get by without the 1100 dollar billet crank. Get It Balanced!!

Dirt Maniac

Total posts: 151
posted September 16, 2001 07:59 PM
No more than 6500 you can run GM powder rods and a stock cast crank.

Also deck the block, line bore and have the cylinders bored square to the crank. Makes everything work better.

Angle mill is good unless the rules say NO.In this case a block decked .005 or 0 in the hole helps along with a lot of meat straight cut off the heads. An eng with flat tops,.005 in the hole and 58cc heads is approx 11.25 to 1 comp,,not bad for stock junk.

Good luck
The Peddler

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