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Old 06-11-2008, 03:04 AM
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350 engine hp...???

hi ...is it possible that my 350 sbc would be producing 280 hp...???

i went to a local shop were they rebuild performance engines/diesel...they called me in to go and place the order for the pistons that i am going to use for the 350...and then this guy from the shop asks me for what kind of engine was i going to use the pistons and what kind of pistons to order...so i told them which ones and so on...then since they work there and should know about hi-performance engines...well the guy asked me for all of my set up...so i told him...he said that it was going to be hard for my engine to make atleast 300hp...
i was shocked after he told me that...he said your probaly looking at about 270-280hp...mmm thats nothing...

so i wanted to ask if he is right or is my setup producing more than 300hp...???

here are the engine parts:

350 sbc 4 bolt main,
600cfm carb,
1 inch open carb spacer,
performer rpm intake,
4.040 bore,
3.48 stroke,
double roller timing chain,
hypereutectic flat top pistons 10.3:1 cr with 64cc and 4.000 bore,
magnum 280h comp cam...480 intake...480 exh...valve lift..@.050 lift-230.
(462624) heads...1.94 intake/1.5 exh valves...76 cc,
flowtech shorty headers...3 inch pipe with flowmaster super 40 no catalytic converter...

should this setup be well over 300hp...???if not just to forget about building it ...and just buy me a 4 cylinder car... ... thanks in advance to everyone...

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Old 06-11-2008, 06:47 AM
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Get a good head and a decent set of headers and it should make the 300+ you are looking for. I would agree with your machine shop on the under 300 HP now.
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Old 06-11-2008, 07:17 AM
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Yeah throw those junk heads away.....get some with atleast 2.02 1.60

Might want to think about aluminum heads.....Something like this....
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Old 06-11-2008, 07:33 AM
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STOP. Um, even though those heads are 'new', there is nothing special about them. They are offshore clones of some existing head or combination thereof. I have heard more bad than good and they do not make any significant gains over some stock or regular GM heads. The heads you have now would outperform those shiny new ones with only a good valve job and a little port and bowl work. They are inexpensive because WHY? I'll tell you why. Because they are CHEAP Chinese castings. Do not be fooled by 'flow' numbers either. How thick is the deck on these heads? How much material below the spring pockets? How accurate is EVERYTHING machined on that head? What material (actual) and what heat treat? What type guides are in them? I bet I could make a set of 416's work better than those things. Honestly guys, I wouldn't lose my *** buying those. I have heard of one fellow tossing his same 'new' heads instead of letting someone else get chumped as they were so terrible there was no fixing them. Really. That being said, will the seller warranty what the 'factory' won't? BTW, where is the factory??? I mean a real physical address. Most businesses do have an address and a phone number. How many can we come up with for those???
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Old 06-11-2008, 09:41 AM
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Those heads 'should' increase the Hp because of the compression increse due to the smaller chambers.. with that said, I would buy a set of new Vortechs instead, only slightly more
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Old 06-11-2008, 12:37 PM
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Righto.....Vortecs are the absolute BEST buy for the $$
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Old 06-11-2008, 01:09 PM
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I would guess 320hp at 5700 rpm and 340ftlbs at 4400. 9.2:1 cr with 76cc heads.

With a good set of 64cc heads (like dart, afr, edelbrock, ect), hp and torque would go to 375hp and 380ftlbs.
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Old 06-11-2008, 03:04 PM
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well thats enough hp and torque to move a 3333lb car for easy 13's or maybe high 12's when running with a fully customized turbo hydramatic 700r4 tranny, 2200-2600 stall converter...with 3.73's gears...

or am i mistaken...??? all i want is to run a low 13 or high 12...will that hp do it....???
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Old 06-11-2008, 04:27 PM
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I'll guess that combo would run a high 13's at 100 mph.

I think you will need the 64cc aftermarket heads to run a high 12 at 107 mph.
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Old 06-11-2008, 05:06 PM
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14.16 in the 1/4 calculated with 232 wheel hp ( take 20% off for the Auto so 290 flywheel hp ) and 3,333 lbs

13.70 in the 1/4 calculated with 256 wheel hp, 320 flywheel hp, and 3,333 lbs


I always use this calculator but I do my own figures for parasitic loss and just check wheel hp.

http://robrobinette.com/et.htm
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Old 06-11-2008, 05:12 PM
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well i was running a low 14 with only the 600 cfm carb, the regular performer intake, tbi heads 1.94/1.5 valves, no smoke pulley,1 inch open carb spacer, no headers,no cam, i was using the stock trans am gta 5.7 roller cam...
super 40 flowmaster...stock gears...3.27's, fulley customized turbo hydramatic 700r4 tranny with no stall...and the engine had suffered overheating problems evaporating all water in block and radiator like about 3 times and messed up the head gaskets which i replaced them but the engine rings and bearings stayed and made the engine not to run in d...if i wanted for it to run good i needed to shift from 1 and up...cause it wouldnt move in d...it had less than half of its hp...in the past and it still ran pretty decent...and i still stayed with the competition... the 1989 manual mustang 5.0 foxy style, my car is a 1989 trans am gta...we would end up tide in quarter mile distance...the mustang will run a 14.7's... i dont think 13 highs is what my car would be running with all of my new setup that i mentioned earlier...
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Old 06-11-2008, 06:07 PM
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Need to upgrade those heads. Adding all those performance parts on a engine with stock heads and low compression will not be very effective.
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Old 06-11-2008, 06:09 PM
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Quote:
Originally Posted by jkingof9561
hi ...is it possible that my 350 sbc would be producing 280 hp...???

i went to a local shop were they rebuild performance engines/diesel...they called me in to go and place the order for the pistons that i am going to use for the 350...and then this guy from the shop asks me for what kind of engine was i going to use the pistons and what kind of pistons to order...so i told them which ones and so on...then since they work there and should know about hi-performance engines...well the guy asked me for all of my set up...so i told him...he said that it was going to be hard for my engine to make atleast 300hp...
i was shocked after he told me that...he said your probaly looking at about 270-280hp...mmm thats nothing...

so i wanted to ask if he is right or is my setup producing more than 300hp...???

here are the engine parts:

350 sbc 4 bolt main,
600cfm carb,
1 inch open carb spacer,
performer rpm intake,
4.040 bore,
3.48 stroke,
double roller timing chain,
hypereutectic flat top pistons 10.3:1 cr with 64cc and 4.000 bore,
magnum 280h comp cam...480 intake...480 exh...valve lift..@.050 lift-230.
(462624) heads...1.94 intake/1.5 exh valves...76 cc,
flowtech shorty headers...3 inch pipe with flowmaster super 40 no catalytic converter...

should this setup be well over 300hp...???if not just to forget about building it ...and just buy me a 4 cylinder car... ... thanks in advance to everyone...
With those heads your true compression is 9.1 to 1 being that those are 76 cc Smoggers and assuming the heads and block are not milled and the piston has 4 ccs worth of valve clearance pockets. However, this should easily make 300 to 340 HP with that cam. But with it's lack of compression combined with the aggressive cam, it's going to be pretty doggy on the bottom end. The weak bottom end will be accentuated by the one inch open spacer which is also going to conspire to kill even more off the bottom end torque. So this is going to be weak out of the hole with a top end rush, unless you're running some real stiff gears out back, although, the 600 cfm carb is going to run out of breath around 5 grand.


Bogie
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Old 06-11-2008, 06:16 PM
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Just remember if you buy vortecs you are buying a new intake as well. I am a fan of vortecs myself

Chet
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Old 06-11-2008, 06:31 PM
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the pistons are the silv-o-lite flat tops (h3437) approximately 10.3:1 cr with 64 cc and a 4.000 bore...and mine has a 4.040 bore...

and the engine still not build...still thinking on what heads to put on...right now i have the (462624) heads and 2 sets of 305 heads...(081) and (601)...but am not going to be using the 305 heads cause of the cr being to high...am still looking to buy some stock gm 64cc chambers...or some better ones than the (462624)...any recomendations...??? i know vortec heads are good but dont have that special intake...maybe for my next build i will be using vortecs...but for now i just want the car to be running and want some heads that will be able to move the car good enough to hit low 13 to high 12's...
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