350sb vs 454bb

[2wd_Sled_Puller]

I am in the process of building a mud truck. i will put a cam in either motor. I will be running 900X16 power king super tractions. What motor will best fit. A carburated 350 or caburated 454. I dont have the computer for the fuel injection stuff. So what would be best for the a mud truck.

 

[malibu795]

BBC will get you more tq for less rpm.

def need to do port work to the stock heads. at a minimum

 

[Skyhigh4by]

Maybe a high reving 350, invest your money in a good cam and valvetrain. Wheel speed is what you want for mud. Less weight up front may keep you on top of the mud better also.

 

[malibu795]

define "high reving" 5k 6k 7k 8k 9k?

anything sustian above 5k cast cranks is basicly done. PM rods are done stock balancer/flywheel is calling it quites

a 600hp SB the turn 8k will cost more then a 600hp BB that turns 6k

granted you get some 300lb of dif in wieght iron head to iron head.


i builts a iron head 500hp 383 for less then 4,500 it will turn ~7500 easy running 10:1 c/r basicly a 1.3:1 motor.. running iron heads. N20 ready.

a 1.3:1 454 is pushing 600hp and can be done with less money.

this is all motor no drug numbers... N20 relibal add 150%


whats your HP goal and how fast you want to turn the motor??????/

 

[RPM Motorsports]

Keep them R's up if it's a mud truck. 350 block 327 Large journal forged crank (or similar stroke) and some RHS heads should get you enough power to keep things reving. What is the total cost you want to invest, so we can get a better view of what you want.

 

[2wd_Sled_Puller]

I want to put a total of 2k in this built i need nothing fancy just a cam for sound purpouses. And enough power to spin my 900x16 over with 3.73 geard

 

[Noreaster]

Destroked 377

 

[2wd_Sled_Puller]

Destroked 377

ok you are speaking to me in spanish :rofl: Whats that

 

[Noreaster]

400 small block with 350 crank

 

[Skyhigh4by]

Ive always had a hard on for 383's. Isnt a 383 a 350 block bored with a 400 sb crank?

 

[Skyhigh4by]

If you want to save money maybe you should think about going with a higher ratio gear and then you could run a motor that doesnt need to spin so fast. But like stated before wheel speed is the key to mud. I dont know how big that tire you state is but I imagine they are big and to keep them spinning your either gonna need big power with lots of rpms or alot more gear than 3.73.

 

[2wd_Sled_Puller]

If you want to save money maybe you should think about going with a higher ratio gear and then you could run a motor that doesnt need to spin so fast. But like stated before wheel speed is the key to mud. I dont know how big that tire you state is but I imagine they are big and to keep them spinning your either gonna need big power with lots of rpms or alot more gear than 3.73.

about 35 inchs tall nothing to huge

 

[Skyhigh4by]

35 inch is a small tire for mud. You shouldnt need to much to spin tires those size. I kinda figured since it was mud we were talking about that those tire were maybe 44 inch or so. I would say with the 3.73 gears you want to run a healthy 375-400 HP that can wind out to 6000ish RPM would be sufficient. Just make sure you find the right heads. If you decide to go with a 350 I would suggest finding a set of vortec heads with casting numbers ending with 082 I believe and then upgrade the valve springs. Those heads are known to make good power and they are cheap and easy to find. I picked up a set at a junk yard for $200 and rebuilt them real cheap.

 

[2wd_Sled_Puller]

Alright sky high i will check into that right there. I will be needed more help on this subject so anything eles u think of through at me

 

[Skyhigh4by]

http://www.chevyhiperformance.com/howto/97458/index.html

Theres lots of info out there but this page is pretty good. I have a set ready to go that I would sell for $250 but shipping would be crazy from here to there. These heads can be found in 96-98 chevy trucks that have the vortec 350. There are also other vortec heads out there that were in some cars and they are reverse flow just make sure you know what your looking for when you go searching.

 

[malibu795]

35" mud tires with 3.73 will be hard to spin in mud run 4.10 or 4.56 in the axles. remeber we are talking gasser not diesel.....



a sb400 with a 350 crank will be a natural high reving motor.

main journals between a sb400 and sb350 are two different sized. the 400 being bigger. i know jegs sells thicker bearings to allow you to use the 350 crank.

2,000 in the motor is going to limit alot of options.
a good set of iron sbc head run 1200-1400 bucks assembled a pair. either dart or world products make a good iron head. just about any stock sbc head will kill the 388ci+ motor by 4500-5000rpm reguardless of cam. due to the fact they doesnt flow enough air. unless you throw $$$ to increase the vavle and a port job.
dotn for get balancing, piston, might be able to get away with stock 350 rods. 400 rods are 5.565" vs 350 are 5.7" a basic set of rod will run 250ish psitons your are looing at 250ish for hyperpnuetetic.
summit has cam kits for 100 bucks and a nice selection for a cheap build
ignition... need that and a good one. stock HEI is decent there are upgrades for it that make it better

arp bolts min for hte heads possibly the mains as well.

 

[Skyhigh4by]

35" mud tires with 3.73 will be hard to spin in mud run 4.10 or 4.56 in the axles. remeber we are talking gasser not diesel.....



a sb400 with a 350 crank will be a natural high reving motor.

main journals between a sb400 and sb350 are two different sized. the 400 being bigger. i know jegs sells thicker bearings to allow you to use the 350 crank.

2,000 in the motor is going to limit alot of options.
a good set of iron sbc head run 1200-1400 bucks assembled a pair. either dart or world products make a good iron head. just about any stock sbc head will kill the 388ci+ motor by 4500-5000rpm reguardless of cam. due to the fact they doesnt flow enough air. unless you throw $$$ to increase the vavle and a port job.
dotn for get balancing, piston, might be able to get away with stock 350 rods. 400 rods are 5.565" vs 350 are 5.7" a basic set of rod will run 250ish psitons your are looing at 250ish for hyperpnuetetic.
summit has cam kits for 100 bucks and a nice selection for a cheap build
ignition... need that and a good one. stock HEI is decent there are upgrades for it that make it better

arp bolts min for hte heads possibly the mains as well.

The vortec heads can flow pretty good numbers and even better with just a little bit of exhaust work. I also agree about the gears and that $2000 does limit alot. I think the higher the gear ratio used the less power will be needed from the motor.

 

[malibu795]

yes the vortec head flow pretty good. the problem is is you are taking a 377 or bigger motor and want to effective max power in the upper rpm you need something bigger then a 170cc intake ideally 200-230cc intake.
jegs sells
gm vortec with 206cc intake 2.00/1.55 valve (809-25534446) for 500 each assembled.
dart iron eagel platnums run 200cc 2.02/1.6 valves 310-10311111P 590 each.
or the 215 for 620 assembled.
world casting either sportmans heads (200cc) 2.02/1.6 500each or the motown 220cc 2.08/1.6 run 500 assembled as well.

i garentee the dart or world casting heads will out preform the vortec heads. and dart will out do world casting in air flow.. if you look are teh drag strip and what not you are more likey to find dart head vs the other two option.