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Author Topic:   motor question for i-stock
tmaster97
Dirt Roller

Total posts: 15
posted August 29, 2004 09:26 PM  
i am new to the sport. ive been a spectator for many years and traded my bleacher seat for the drivers seat.i bought a turnkey car that has a sb 350 racing imca rules. i want to build a better motor for next year. any picks on which would be best to go with? most of the racers where i race are running 6.33 gears. thanks for ANY advice.

istock59
Dirt Forum Champ
Total posts: 501
posted August 30, 2004 06:51 AM  
I see by your profile that you're from TX. My understanding is that TX tracks are almost always dryslick. So your 350 CI motor should be more than enough. Put together a good reliable 355 that you don't have to worry about (or work on every night) and work on the chassis setup.

Now up here in IMCA-North country (IA), a 355 won't get the job done. Better be packing 377,383,406 (or more) to get it done. Tracks stay too tacky for a 355. IMO.


tmaster97
Dirt Roller

Total posts: 15
posted August 30, 2004 03:05 PM  
thanks you are right most of the tracks do go dryslick but not ours it stays real tacky 90% of the time.whats good for tacky track?

36 Race Team
Dirt Full Roller

Total posts: 45
posted August 30, 2004 04:36 PM  
put as much in her as your rules and pocketbook will allow...even though its your first year if you go with the small motor by the middle of the year you'll be tired of being passed down the straightaways at the beginning you won't use it all but by the end of the year you'll be glad...my opinion and experience

racer17j
Dirt Forum Champ
Total posts: 5390
posted August 30, 2004 04:37 PM  
build it right and there is room for smaller displacements
i out run 406's with my 327
the right cam, intake and heads make the difference

bobaluuu
Dirt Freak

Total posts: 474
posted August 30, 2004 06:46 PM  
Im with you toolman, after 8(main)wins this year with a simple motor355w/vortecheads. I
feelthat setup and traction are the keys to success

JohnG
Dirt Maniac

Total posts: 137
posted August 30, 2004 07:04 PM  
toolman, bobaluu are either of you running a 350cfm carb???


tmaster97
Dirt Roller

Total posts: 15
posted August 30, 2004 07:50 PM  
thanks for all the replies. we are limited to a 350 cfm carb and stock intake. this motor has been bored .30 over with dome pistons but i dont know what heads are on it.would changing heads help? if so what would be the best to get?i am new to this so im not sure of all the different combinations a person can run. thanks for the help.

istock59
Dirt Forum Champ
Total posts: 501
posted August 30, 2004 08:10 PM  
tmaster97, if your track stays tacky, I'd say build a 383 or a 406. Either one will make plenty of torque and that's what you need for a IMCA Stockcar motor and a tacky track.

You guys running 350s and smaller must not be tied to a 350 cfm carb...

I'll put it this way, my spare motor is a 355, with 6" rods, lightweight pistons, lightened crank, vortec heads. All decent parts. Probably has 10 nights on it since it was freshened. And it's coming apart this winter to become a 383, because I won't waste my time racing a 355 again with the dinky carb.

racer17j
Dirt Forum Champ
Total posts: 5390
posted August 30, 2004 09:58 PM  
flat top 327
dart heads
brzezinksi intake and stock holley 4412
custom roller cam

yea i can run with the big boys

???? why run big cubic inch if you can't feed it??? if you can run less cubes and have it run better


drive hard or drive home

JohnG
Dirt Maniac

Total posts: 137
posted August 31, 2004 05:05 AM  
You have a 4412, I could run a 355 then also.

istock59
Dirt Forum Champ
Total posts: 501
posted August 31, 2004 06:08 AM  
4412? Yeah, I could run less cubes with that too. If you've never run a 350cfm carb, then you don't understand.

The bigger cubes make more torque, regardless of the carb.

Besides, maybe (and I say maybe) a 327 could be made to run within IMCA rules, but lets not forget the $425 claim rule....

iowatoolman
Dirt Freak

Total posts: 369
posted August 31, 2004 09:50 AM  
last year i ran a 406 it losts of torque but i would take my 327 anyday of the week

500 cfm on both

your gonna tell me that it cost more to build a 327 than a 383 or 406????????

drive hard or drive home

istock59
Dirt Forum Champ
Total posts: 501
posted August 31, 2004 11:20 AM  
As I said before: "If you've never run a 350cfm carb, then you don't understand."

I've run a 355 and a 383 both this year. Hands down, the 383 is the better choice for an IMCA Stockcar on a tacky track.

Yeah, to get a 327 to run competitively under IMCA rules, I do think you're going to have to spend more than you would on a 383 or 406. A 327 had better'd be darn light internally to let it rev quick.

waltonjr1
Dirt Forum Champ
Total posts: 516
posted August 31, 2004 11:46 AM  
Iowa, lets not forget that your running figure 8 and were running oval. How long of a straight do you actually run? Maybe less cubes is the way to go in figure 8 racing but a well built 406 will monkey stomp a well built 327 on a 3/8 oval anyday.


robhbk24
Dirt Freak

Total posts: 372
posted August 31, 2004 02:20 PM  
i've been running a small journal 331.327 +.030 for 4 seasons now and i have to say that properly built they are as good as any 355 or 400 that is running with us now. i run better on a tacky track than i do a slick. big 3/8ths, 461 heads bryzenski intake "box stock" 4412, "stock exaust manifolds" log style, and a nicely domed piston. plenty of power and i geta 200lb weight break over the 355s more over the 400s. the slight power diff between the 3312 an the 355 inmo is worth it for the 200lbs weight break. if we did not have a minimum weight of 3000lbs i'd prob be running a 307 or 283.

iowatoolman
Dirt Freak

Total posts: 369
posted August 31, 2004 04:33 PM  
TMASTER97

PICK THE RIGHT CAM AND RUN IT

the cam is what makes the power or breaks the power

cubes are just ways for guys to have bragging rights
does it make any sence to run a bigger motor that is starved for air and fuel or build one that runs on what cfm you can legally provide????????????????

left turn then right turn to the checkered
drive hard or drive home

waltonjr1
Dirt Forum Champ
Total posts: 516
posted August 31, 2004 05:58 PM  
More cubes= more compression more compression= more power

compression is the key to making a restricted motor run.


tmaster97
Dirt Roller

Total posts: 15
posted August 31, 2004 06:40 PM  
i've been asking around and it seems that most are running 383's found one 377 and two 406's. i was also told that vortec heads and intake on this engine would make a big difference what do you think?im looking for a somewhat economical things to do for now till next season. took about all i had to get into the car.economical LoL i know these two things dont go together. LoL

stockcar5
Dirt Forum Champ
Total posts: 578
posted August 31, 2004 07:06 PM  
i have run a nice 355 with the 350 carb and it was ok. but this year i ran 1 race with the imca carb and i ran a dart headed 377...that was the way to go. it was smooth and would pull anyone down the straightaway. i turned about 6500rpm with it and ran a howards cam.

luke

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