what hp will a 350 4 bolt main take - Lateral-g Forums

kovert · #1 10-21-2007, 06:22 PM

im kinda new to working on chevy..i am working on doin a chevy project and a mopar any way what kind of power do the 350 factory chevy 4 bolt main blocks take if suited with the proper internals???

i know the factory ford production hydr roller 302 block will take between 500rwhp and 600rw and thats a 2 bolt main...

the 350 will be grouped with 2 turbos so im trying to figure out if i need a aftermarket block or if the factory 350 4 bolt will work

**camcojb** · #2 10-21-2007, 07:48 PM

Quote:

Originally Posted by kovert

im kinda new to working on chevy..i am working on doin a chevy project and a mopar any way what kind of power do the 350 factory chevy 4 bolt main blocks take if suited with the proper internals???

i know the factory ford production hydr roller 302 block will take between 500rwhp and 600rw and thats a 2 bolt main...

the 350 will be grouped with 2 turbos so im trying to figure out if i need a aftermarket block or if the factory 350 4 bolt will work

what is your hp goal?

Jody

Blown353 · #3 10-21-2007, 08:17 PM

If you're starting fresh and running turbos I'd strongly recommend a good aftermarket block. There is no reason not to do it right from the get-go. Cheaper to build it once!

A stock block will take quite a bit of power but an aftermarket block with thicker cylinder walls will make more power even when everything else is equal because the thicker bores don't flex as much and the rings seal better. The more cylinder pressure you throw at it the more pronounced this becomes.

My car is making about 650 or so HP at the rear wheels using a .020 over stock 010 4-bolt block (studded) and has zero issues even with quite a few miles on it now. Things looked great last time I had it apart. However when I build a bigger cube shortblock it will be with a Dart block.

Scotch · #4 10-22-2007, 09:21 AM

With proper prep and machining, I've seen 350 4-bolt blocks approach 1,000 hp. They didn't have to LIVE there, but they could touch it without exploding.

"Proper Prep" includes complete "hot" machining done at 200 degrees F, aftermarket billet steel main bearing caps, ARP main bearing studs, Hard Blok up to the freeze plugs, and top-quality components throughout (billet crank, rods, etc.)

The block should be magnafluxed and sonic tested prior to starting anything, and either cryo treated or vibration treated before machining. Doing both wouldn't hurt.

~SP~

deuce_454 · #5 10-22-2007, 09:36 AM

why not get a schafiroff power-adder long block.... it is built for boost and you wont have to modify the crap out of a stock SBC... and it propaby costs less too

badmatt · #6 10-22-2007, 09:40 AM

io know of a stock block with billet caps and a half fill living to 1200RWHP

kovert · #7 10-22-2007, 11:09 AM

the car will be a street driven car so i dont think filling the block will be smart at all for cooling.. my goals ide like to make around 700 to 800 rwhp ..

im kind of on a budget which is no good for building high hp engines but the aftermarket blocks that i have found seem to be 1500+ dollars which i can pick up a factory 4 bolt from a friend for 300 thats a big diffarence in pricing if you guys know of a place to get cheaper aftermarket blocks please let me know i would love to make 1000hp with a aftermarket block but 1500 is not gonna happen for me after machining decking etc those blocks are even more...

badmatt · #8 10-22-2007, 11:16 AM

Quote:

Originally Posted by kovert

the car will be a street driven car so i dont think filling the block will be smart at all for cooling.. my goals ide like to make around 700 to 800 rwhp ..

im kind of on a budget which is no good for building high hp engines but the aftermarket blocks that i have found seem to be 1500+ dollars which i can pick up a factory 4 bolt from a friend for 300 thats a big diffarence in pricing if you guys know of a place to get cheaper aftermarket blocks please let me know i would love to make 1000hp with a aftermarket block but 1500 is not gonna happen for me after machining decking etc those blocks are even more...

run a bigger oil cooler...

**camcojb** · #9 10-22-2007, 12:34 PM

[QUOTE=kovert]the car will be a street driven car so i dont think filling the block will be smart at all for cooling.. my goals ide like to make around 700 to 800 rwhp ..

im kind of on a budget which is no good for building high hp engines but the aftermarket blocks that i have found seem to be 1500+ dollars which i can pick up a factory 4 bolt from a friend for 300 thats a big diffarence in pricing if you guys know of a place to get cheaper aftermarket blocks please let me know i would love to make 1000hp with a aftermarket block but 1500 is not gonna happen for me after machining decking etc those blocks are even more...[/QUOTE]

too high for a stock block if you want longevity. Yeah, it'll last some amount of time, but you're definitely beyond what that block was engineered for.

Put it this way, you will spend way more than the $1200 difference if/when you break it and have to replace it and all the parts you lose in the process.

I'm sure you realize that $300 block will need all the machining that the aftermarket block does, if not more.
Jody

Scotch · #10 10-22-2007, 01:51 PM

[QUOTE=kovert]the car will be a street driven car so i dont think filling the block will be smart at all for cooling..

I've seen cars run filled blocks on the street, but they were filled only to the bottom of the freeze plugs and had killer cooling systems for both coolant and oil.

my goals ide like to make around 700 to 800 rwhp ..

There are lots of ways to do that. Now, how are you going to put all of it to the ground?

im kind of on a budget which is no good for building high hp engines but the aftermarket blocks that i have found seem to be 1500+ dollars which i can pick up a factory 4 bolt from a friend for 300 thats a big diffarence in pricing if you guys know of a place to get cheaper aftermarket blocks please let me know i would love to make 1000hp with a aftermarket block but 1500 is not gonna happen for me after machining decking etc those blocks are even more...

If I could offer some advice, I'd say go with the $300 block and make 500 hp with it. It can take that without trouble. Get the car dialed in so it can use every one of those 500 horses, and you can learn to drive it with that level of power. Then, look into building another engine with the aftermarket block.

Why build a 750 RWHP car that can only put 350 horses to the ground? Dialing in your suspension and getting traction is harder than making horsepower with a small-block Chevy. Get the hard part figured out first, and then turn up the wick on the easy part.

~SP~