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Old 12-11-2003, 07:33 PM
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Arrow need race engine help!!!

Alright fellas, I'm in serious need of some help. I'm trying to get into local dirt track racing, and need some help building an engine for my car. I'm running short track late modified class, no more than 366 cubes. Got a four bolt main chevy 350, gettin it machined by a friend so those costs aren't a problem. I need low end torque, but the motor still needs to be able to spool to about 7g's without a problem. I need to know if a set of p&p Vortecs will get me there, and what mods I need for those to work. I plan on using forged rods, crank, pistons. Also need to know a good cam/compression combo that'll put me where I need to be with those heads. Any manifold and carb suggestions would be helpful. I want to squeeze as many horses out of this motor as I can without flying apart. Oh, by the way, would it be worth it to use a roller cam in this, or will flat tappet work, and would hydraulic or solid be better. I know I'm asking a lot, but I would really, really appreciate some good feedback on this one.

Thanks, Travis

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Old 12-11-2003, 08:11 PM
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Here man, call my motor head and ask him, he sets up all the local guys engines for the track. 1-440-986-6111 ask for Rich, his old man may answer and is good to but I like dealing with rich. This is Wallace & Dewitt in Amherst Ohio. Maybe you can get him to bench race for you.


Todd


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Old 12-11-2003, 09:36 PM
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What's the budget?

Here is a proven winner combo at my track:

Stroke: 3.58(stock crank ground .020 offset, nets 367ci

Bore: 4.030

Head: IMCA legal Spec head reworked for 5 angle valves back cut .010 and angle milled to 21' valve angle.

Cam: Should be no less than 102 center line and go solid lift with a overlap of 85 or better. Lift at .680 with 1.7 rocker.

Rod: Crower or Callies stock replacement lightened to 425 grams.

Piston: KB forged or JE coated with .200 dome and 1.16 compression hieght if the block deck can take it. Ringfs should be a 3/16 package. No less than 14:1 compression.

You didn't state what rules you must abide by or what saction you race at. Size track, type of dirt and banking and weight or car with what desired gear I will also need to know. Running alky or gas? Are you sure you can run a roller? Can you float the rear? Are you limited to a Hoosier tire or American Racer?

Typicaly, torque will just spin the tires and get you no foward bite. A big bore engine unshroud the valves at race RPM's. You need horsepower and gear. Post here or PM me and I can recommend an engine. I've got a ton of big bore short stroke engines combo's I know can make over 550 horsepower

What's the budget?

Here is a proven winner combo at my track:

Stroke: 3.58(stock crank ground .020 offset, nets 367ci

Bore: 4.030

Head: IMCA legal Spec head reworked for 5 angle valves back cut .010 and angle milled to 21' valve angle.

Cam: Should be no less than 102 center line and go solid lift with a overlap of 85 or better. Lift at .680 with 1.7 rocker.

Rod: Crower or Callies stock replacement lightened to 425 grams.

Piston: KB forged or JE coated with .200 dome and 1.16 compression height if the block deck can take it. Ring's should be a 3/16 package. No less than 14:1 compression.

You didn't state what rules you must abide by or what sanction you race at. Size track, type of dirt and banking and weight or car with what desired gear I will also need to know. Running alky or gas? Are you sure you can run a roller? Can you float the rear? Are you limited to a Hoosier tire or American Racer?

Typically, torque will just spin the tires and get you no forward bite. A big bore engine unshroud the valves at race RPM's. You need horsepower and gear. Post here or PM me and I can recommend an engine. I've got a ton of big bore short stroke engines combo's I know can make over 550 horsepower
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Old 12-12-2003, 07:30 AM
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Heads and cam are the biggets question and how much
do you want to spend. If it is a limited cl**** with certain
heads and stuff that can get quite expensive because the
top cars have massaged heads. If you can go roller then of
course go roller. Also what size tire is it. You can make all the
HP your budget can stand but if you can't put it to the clay then
its not worth it.

Cstraub
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