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Old 08-21-2009, 01:40 AM
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trying to get 400 hp out of my 350

i have a 350 that i am trying to get 400hp out of... i can do most of the work myself i just need help with what combinations i should use too reach my gole of 400hp with a budget of $1800-2200 i dont realy care if i cant drive it to work every day but if i want too i can hit a cruise on the weekend...
if anyone can help im most interested...

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Old 08-21-2009, 01:48 AM
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Hi Ray. The main question is....heads. Do you have heads or will you buy heads. If buy, what's your budget?

I have a DynoSim pull on file, 350 bored 0.030", these pistons
http://www.summitracing.com/parts/SUM-17350-30/
garden variety GM 883 heads, Edelbrock Performer RPM intake, 600 cfm carb, 1 5/8" long tube headers and this cam
http://www.compcams.com/Cam_Specs/Ca...x?csid=85&sb=0
Cut the block decks to 9.012" block deck height and use GM 10105117 head gaskets. Makes 380 hp @5000 rpm's and 430 ft/lbs of torque at 4000. Nice, cheap little street motor that will run on pump gas.

Last edited by techinspector1; 08-21-2009 at 02:06 AM.
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Old 08-21-2009, 03:01 PM
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sorry about the other post i thought i lost it wen my laptop died on me...
i i have a complete running motor that came out of a boat the bottom end was rebuilt not long ago its like brand new... i do have a set of cast 2.02/1.95 heads edlebrock rpm performer intake and a 600/750 holly carb wit spacer wold this help me... if not what heads would i use for your idea???
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Old 08-21-2009, 03:02 PM
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That combo with 883 heads (just as bad as the famed "slug" 882's)
will get you around 325HP at best. more like 300hp. The factory low perf engiens that came with these heads were rated 180-200hp. The 882 and 883 heads have very restrictive undersized poorly shaped ports. The chamber sucks too.
Your dyno sim program is way over modeling the potential of these low perf smogger heads.

For a 400hp 350 you need 10:1 to 10.5:1.
You need more head port flow than what a stock OEM SBC head produces. You have two options.
Use a OEM stock SBC head casting (start with the best set you have or can get)
and fully port it yourself.
Or buy aftermarket heads that are already capable of producing 400+hp.
There are lots of ways to skin that cat.
You could also start with a new, aftermarket " S/R" head and port it yourself.

Factory head route:

But you want to avoid using the worst of the worst low perf SBC heads. eg: 882-883-624 castings and such.

96-2000 350 Vortec heads great choice. 906-062
new GM bowtie vortec great choice
GM OEM camelbacks 461-462-186-291-292-487 041 370 or bowtie race 034, great choice need some porting.

GM late 80's corvette L98 aluminum great choice need porting
"" "" " corvette cast iron L98 083 217 good choice need porting.

GM mid 80's LG4 305HO #416 castings good choice need full porting and larger 1.94x 1.60 valves.

Pre 1975 GM heavy casting 76cc open chamber smoggers
441-487(X) 920 336 ok choice best of the worst need full porting need a small dome 350 piston for cr.

Once you got the cylinder head with enough flow, the rest is pretty easy.

What cylinder heads choices do you have to work with?
Casting number? valves diameter?
Are you up to porting your own heads or rather buy bolt on 400hp+ ready heads?
What vehicle is it going in?
You can probabily plan on needing to swap rear gears and get a high stall torque converter to get the best out of your 400hp 350. But if you build it correctly, it will "G-- L-- H"

Yes you'll be able to drive it to work daily. In fact you'll probabily enjoy it. its all in proper setup and tuning.
A performer rpm manifold is great. A 750cfm carb is prefered.

Last edited by F-BIRD'88; 08-21-2009 at 03:15 PM.
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Old 08-21-2009, 03:24 PM
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i would love too do the most work as i can i want it to be mine... what do u mean vortec could pull them off a camaro firebird suburban if not what kind of cars do the come off im not very good with numbers and castings...
95 s10 exc

Last edited by ray ray; 08-21-2009 at 03:39 PM.
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Old 08-21-2009, 04:06 PM
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Quote:
Originally Posted by ray ray
i would love too do the most work as i can i want it to be mine... what do u mean vortec could pull them off a camaro firebird suburban if not what kind of cars do the come off im not very good with numbers and castings...
95 s10 exc
chev cylinder head casting number are found under the valve covers between the springs.
www.mortec.com lists all the heads

last three numbers in the casting number "062" "906"
96-2000 GM 5.7L "L-31" 350V8 pickup truck. These are the famed OEM "vortec heads"

Do not buy "swirl port" heads from a "TBI' motor. They are not "vortec heads" These heads have a big swirl vane in the intake port. they are not the same.
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Old 08-21-2009, 04:12 PM
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If you want a great aftermarket entry level head that you can port yourself at home to make 400++++HP llook at the NEW Edelbrock E-Street heads. under $1000. neede a little tune up on the ports and they are ready to rock.

Brodix IK200 ready to rock even evilier with some porting clean up.

Summit #162111 same as above. goof proof 400++hp.
under $1000

RHS Torker 906 vortec (2.02 valve) geat vortec choice
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Old 08-21-2009, 04:24 PM
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what kind of cam should i go with and should i do any thing with the bottom end it is already .30 over and wen i did a com test it had 173-175 on every cylender... i would like to put a 700r4 in it but what i was told it wont hold.
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Old 08-21-2009, 04:24 PM
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I have a favorite low buck dirt cheap "Poor Mans" street/strip race motor combo that makes 400+hp. Its cheap to build .
It requires full home porting and home brewed "poor man racer" hi perf preparation of a set of the "305 HO" heads #4416 casting (end numbers) and new larger 1.94x 1.60 valves. requires a valve job.
Goes on a basic rebuilt 10:1 cr 350 with flat top pistons.
Isky #201027 "Z27" street solid cam+ performer rpm manifold headers and a 750 carb.
needs a 10" 3500 stall and 4.10's to 4.56's for max street machine perf.
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Old 08-21-2009, 04:26 PM
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Quote:
Originally Posted by ray ray
what kind of cam should i go with and should i do any thing with the bottom end it is already .30 over and wen i did a com test it had 173-175 on every cylender... i would like to put a 700r4 in it but what i was told it wont hold.
Don;t waste your time or money on a 700r4. this lil motor likes to rev. let it rev. Overdrive is near useless with this type of hi perf motor 700r4's are for wimps and posers.
a decent th350 will do fine.
What is this going in?

Last edited by F-BIRD'88; 08-21-2009 at 04:54 PM.
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Old 08-21-2009, 04:33 PM
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a 95 s10exc that i have put a 373 gear under it
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Old 08-21-2009, 04:46 PM
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Quote:
Originally Posted by ray ray
a 95 s10exc that i have put a 373 gear under it
What re the heads you got right now? casting number?

What is a "EXC" 2w drive? 4 w drive?
The motor I outlined will not likely pass a state emission test or visual OEM emission equipment inspection. Be sure of what exactly is and is not emissions legal in your state before you start modifing your truck.

Last edited by F-BIRD'88; 08-21-2009 at 05:01 PM.
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Old 08-21-2009, 05:02 PM
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extended cab 2wd i dont have he heads on hand they r at my property...
i live in Michigan we dont have emissions
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Old 08-21-2009, 05:18 PM
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Quote:
Originally Posted by ray ray
extended cab 2wd i dont have he heads on hand they r at my property...
i live in Michigan we dont have emissions
On the cheapy 350 street machine engine combo I outlined
The 3.73's will work if you use a short short diameter rear tire.
it wants gear It wants to rev. You can use a taller tire (28") for work/commute then switch to a short diamter 24-26" sticky tire for street strip max perf.

Building a mild street blower motor (144ci- 177ci) is a good option too. Especially if you have a set of low compression (decent) open chamber 76cc heads on hand and can home port them.
its also a easy build and likes 3.73's and a 3000-3500 stall 10" converter.
you can drive it back and forth to work too.
uses a slightly different blower friendly dual pattern camshaft.
Lunati #401A3LUN mechanical street Mild enough for the street, blower friendly and likes to rev too.
it also goes like H***! for a $
these are just two ways amount many ways to skin the cat for a affordable 400+hp 350.

Last edited by F-BIRD'88; 08-21-2009 at 05:50 PM.
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Old 08-21-2009, 05:25 PM
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thanks for all your help it was much help full!!!
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