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Old 02-20-2013, 03:05 AM
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how much hp does my engine have roughly

hi my name is justin i have a 1968 350 olds rocket engine original hp rating 325hp but i rebuilt it and i was wondering how much hp i have now roughly if anyone can help

engine specs:
edelbrock performer 350 olds 4 barrell intake
edelbrock 650 cfm carb
olds #5a heads shaved
455 lifters and rockers (non roller)
polished stock crank
stock pistons
cylinder walls honed
high volume oil pump
comp cam duration 274/286 lift .520/.523 lobe seperation 110 hydraulic flat tappet
stock water pump
no power steering
electric fuel pump
1 5/8 full length flowtech headers into 3 inch collectors into a 2.5 exhaust x-pipe
3 core radiator
hei distributor not sure of brand
bolted up to a tci streetfighter automatic trans with shift kit and a 2500 stall converter

if anyone has any idea or rough idea itd be very helpful i listed everything i could think of

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Old 02-20-2013, 07:27 AM
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I would guess 350 hp at the crank. Remember the old way of measuring horsepower was a little misleading. You probably are close to 400 Ft Lbs of torque in my opinion.
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Old 02-20-2013, 07:43 AM
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Quote:
Originally Posted by 455olds View Post
I would guess 350 hp at the crank. Remember the old way of measuring horsepower was a little misleading. You probably are close to 400 Ft Lbs of torque in my opinion.
These numbers sound pretty reasonable, maybe a hair low if there was any work done to the heads. Properly worked those heads can do pretty well, in stock form they're not that great.
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Old 02-20-2013, 10:11 AM
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the camshaft may have added some power on top.the smaller carb didnt help.By the time you go through the exhaust system it might be close to original sae output.Im sure,over all its an improvement over what the car did before.
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Old 02-21-2013, 11:07 PM
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we used to have a 750 carb on the engine before that cam we put in and the car seemed like it didnt want to sit still but any ways if i wanted to gain a significant amount of hp like 50-100 what could i do or add thanks
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Old 02-28-2013, 07:31 PM
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so with the known parts on my engine how much of a gain or an improvement would i get if i put a edelbrock performer rpm intake on with a 750 carb a comp cams hi tech racing timing gear set double roller high volume aluminum water pump and maybe a march serpentine pulley system still doin away with power steering
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Old 02-28-2013, 07:48 PM
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how much of a gain or how much hp

i have a 1968 350 olds engine originally a 325 hp engine stock

engine specs:
edelbrock performer intake
650 cfm edelbrock carb
#5a shaved heads
stock pistons, water pump, crank (polished)
flowtech full length headers 1 5/8 to 3 inch collectors
double roller timing chain
455 lifters and rockers
cylinder walls have been honed
comp cam extreme energy camshaft lift .520/.523 duration 274/286 lobe lift .325/.327 lobe seperation 110 degrees hydraulic flat tappet
stock valve springs, valve seats
hei distributer
high volume oil pump

trans specs:
tci streetfighter turbo 350 trans with a 2500 stall converter

thats how my engine sits now if i were to change the intake, carb, water pump, and timing chain how much of a difference would i see

changes:
edelbrock performer rpm intake
high volume water pump
comp cams hi tech racing timing gear set
750 carb

and roughly how much hp would i have

i also have this engine in a 1980 trans am and was wondering what rear end gears i should go with it is a full posi rear end unsure of current gears in it might be 2:41's
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Old 02-28-2013, 07:56 PM
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how much hp does my engine have roughly
same question?
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Old 02-28-2013, 07:59 PM
How fast is fast enough?
 
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With the Additional changes you may be around 380ish hp, port the heads and you could be closer to 425ish. For gears I'd go around 3.5-3.8ish ratio depending on tire size and what ratios are available.
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Old 02-28-2013, 09:00 PM
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im wondering if those stock springs are ok to run with that cam ? lots of lift there for stockers , and those gears ! are you going to bonneville ?... reread it has that cam with stock springs ok . you need some gears 355 , 373 for sure your next move . 350 + 370 maybe hp just a guess .
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Old 02-28-2013, 09:12 PM
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Those stock valve springs will not handle that much lift.
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Old 03-01-2013, 12:39 AM
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Please don't double post the same question, your two posts are merged here, which makes the thread confusing.
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Old 03-01-2013, 01:29 AM
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so how much would it cost to get the heads ported and what kind of springs should i use? i mean the car is still in the middle of the build and i had the engine running just not in complete time and it seemed to do fine while it was running
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Old 03-01-2013, 02:06 AM
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If you want to get after it,here:

Mondello Performance Products, Inc. - Oldsmobile - (805) 237-8808

Of course Joe is dead now.

One thing as a summary in my head was B-P-O- and Caddy all shared the same leak link being the valve train wasn't very good.They made gobs of torque,but without serious valve train mods,didn't like being spun up high.

Last edited by 1Gary; 03-01-2013 at 02:16 AM.
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Old 03-01-2013, 04:57 AM
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Take it to the drag strip and use 1/4 mile trap speed and total car weight to calculate HP.

Lets us know the results!
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