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73-87 Chevy _ GMC Trucks => Performance => Topic started by: gildardo01 on May 23, 2013, 08:34:18 pm
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hey there... i was wondering how much torque and HP my engine is putting out... its a fresh engine but with rebuilt 30 over.. stock heads cam 204 intake 214 exhaust at .05 duration... performer intake.. 650 edelbrock carb, headers and electric fan... any ideas on HP and torque outputs... i was thinking about installing vortec heads.. but its only a daily driver so i dont think its really worth... what do you guys think? thanks for the input..
by the way any ideas for more torque?
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Small block or big block?
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small block...
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Well depending on the year/head casting number id say 315 to 335ish would be a respectable hp for a combination like that has it ben tuned? it depends on alot of factors tho
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i have no idea what kind of head i´m using... and i tuned it just by using a vacuum gauge.. nothing fancy... any ideas on how i can make more HP and torque... what would be better adding vortec heads and maybe later on going with a supercharger or something.. or going straight for the supercharger... i dont think the engine needs more cam since its just a daily driver right.... thanks for all the input..
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Id do a Supercharger I have both a vortec v3. And 6-71 they are good bang for ur buck there around 2k$ but its a easy 100hp and its very reliable or u could put a 144ci or 174ci roots blower but either way u need a better/biger carb id say holley 700 DP with mechanical secondarys but other mods would be lucky to gain u 30hp
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Id do a Supercharger I have both a vortec v3. And 6-71 they are good bang for ur buck there around 2k$ but its a easy 100hp and its very reliable or u could put a 144ci or 174ci roots blower but either way u need a better/biger carb id say holley 700 DP with mechanical secondarys but other mods would be lucky to gain u 30hp
so you dont think heads are all that necessary?
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Always remember the power is in the heads. Good flow #s make fer good TQ and HP
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Nah not with a blower cuz there is no head flow its under pressure blower motors are not as demannding on head flow as NA id keep the boost at 6psithe that would be about 450ish hp if any thing id upgrade ur fuel/ingnion systems
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The best thing about a blower is there not picky no port matching on a street blower motor no huge cam they can be very street friendly and still put down 550hp with stock ported heads.
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if you have the 76cc lame heads then the vortecs would probably be good for 30 hp. Then you gotta change the intake and valve covers though.
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Before you bolt on a blower, you should have a solid rotating assembly and block. What are your components now?
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well i dont have the money for a blower right now.but i was thinking abut going with a new set of heads... my rotating assemble is pretty much stock... stock crank, stock rods with ARP bolts the block is 4 bolt mains... and the pistons are hypereutectic... and the ignition is HEI distributor with Pertronix internals... with a 50k Volt coil...
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That would be fine for a mild set up like 5or6 psi
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having a sc engine and a na engine. its not just throw it on and go you have to thing the more air you have going in the more that hast to leave. so you need to start with exhaust and then work on the intake. stock i think the sb was putting out about 200 with just pertty much adding a cam and headers your not going to gain close to 300 to started you need better heads than cast iron heads. think about it like this if you just add a bigger air filter what will that gain when its still being sucked threw a straw.
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and get everything to be on the same power band. or they wont work well together
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Well I mean the vortec v3 and small roots blowers can be bolted on as long as the compression ratio is low and the motor is fresh and boost is kept low like 5 or 6psi I just finished a blower motor for my camaro and its specificly built for the blower loser piston to bore clearances blower cam blower pistons ect it should make around 800hp at 7500rpm on race gas with 16%a over drive
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yes you need blower rotating assembly if you want her to last. even 5-6 psi is what like essentially 15-20
"Fast, Cheap and Reliable" you can only choose 2
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got a l67 its only 240 hp and 280 tq. its NA sister is 200 hp 240 tq
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15-20?
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having a sc engine and a na engine. its not just throw it on and go you have to thing the more air you have going in the more that hast to leave. so you need to start with exhaust and then work on the intake. stock i think the sb was putting out about 200 with just pertty much adding a cam and headers your not going to gain close to 300 to started you need better heads than cast iron heads. think about it like this if you just add a bigger air filter what will that gain when its still being sucked threw a straw.
i guess its a now brainer to go with some heads then.... whats recommended vortec head or go straight to aluminum heads.... so you dont think im at the 300 hp mark with what i have so far...
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got a l67 its only 240 hp and 280 tq. its NA sister is 200 hp 240 tq
what do you mean by l67 and NA sister?
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If you are on a budget, the Vortec's are hard to beat. Summit has their own version, ready to go that can handle .520 lift, for 620.00.
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hey there... i was wondering how much torque and HP my engine is putting out... its a fresh engine but with rebuilt 30 over.. stock heads cam 204 intake 214 exhaust at .05 duration... performer intake.. 650 edelbrock carb, headers and electric fan... any ideas on HP and torque outputs... i was thinking about installing vortec heads.. but its only a daily driver so i dont think its really worth... what do you guys think? thanks for the input..
by the way any ideas for more torque?
Based on 1.94" intake, 1.5" exhaust, non-ported stock heads with 9.5:1 compression, fed 650 CFM through a dual plane Performer, and estimating your cam profile, you probably are generating somewhere around 300 hp and 425 lb-ft.
With your cam/carb combination, migrating to 195 heads with 2.02" intake, 1.6" exhaust and 76cc chambers (~10.5:1) could net an additional 60 - 70 hp and 40 - 50 lb-ft, shifted ~1,000 RPM higher. Of course, this is a WAG with plenty of assumed variables.
The cam/carb combination you've chosen beg higher flowing heads, but 195cc is probably about the limit. Outside of forced induction, less restricted heads will provide a significant improvement. However, boosting compression may require higher octane fuel.
Aluminum heads are more tolerant of compression increases w/o incurring detonation than are iron heads. But, iron heads are less expensive and may provide improved service life.
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Keep in mind to, there is no difference in power between aluminum and cast iron heads with the same flow numbers. There is weight loss and lower temperatures with aluminum though. Vortec heads are cost affective and flow enough to support 400+ hp with a little work, but these heads are better for torque with the 170cc runners and 1.94/1.5 valves.
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What are we talking about when you say rotating assembly ?
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lets say i install some vortec heads what kind of HP and torque will i be looking at now... think 350 hp and 450lb tq would be possible then... ?
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What are we talking about when you say rotating assembly ?
rotating assembly... means the bottom end in an engine... pistons, rods, and crank...
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What are we talking about when you say rotating assembly ?
rotating assembly... means the bottom end in an engine... pistons, rods, and crank...
Thanks
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got a l67 its only 240 hp and 280 tq. its NA sister is 200 hp 240 tq
what do you mean by l67 and NA sister?
L67 is chevys 3800 super charged engine, NA is naturaly aspirated
15-20?
when you take into the natural vacuum of the engine if you want to get to 6psi you have to not only do 6+ but the counter the natural vacuum
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lets say i install some vortec heads what kind of HP and torque will i be looking at now... think 350 hp and 450lb tq would be possible then... ?
There are so many different combinations nowadays that will make great power with even a bone stock 350 long-block.
As a documented example... Chevy High Performance took a stock Mr. Goodwrench 350 (i.e., the cheapest GM 350) with cast stock-style dished pistons. They ran through many combinations, but with pocket ported Vortec heads (otherwise stock 1.94 intake/1.5 exhaust), 0.041-inch head gaskets Fel-Pro 1003 head gaskets, Comp cams XE 268 cam, Edelbrock Performer RPM Vortec intake and Holley 750 cfm carb and 1 5/8 full length headers. The combination made 401 ft/lbs torque at 3,600 rpm with a peak of 384 hp at 5,700 rpm.
With a 0.015-inch head gasket, larger headers and better mufflers and additional tuning, the same generic Mr. Goodwrench 350 engine made 429 ft/lbs of torque at 3,800 rpm and 409 hp at 5,900 rpm...
They indicated in the write-up that the XE262 cam would make more torque with the same HP. So depending on your build, you probably should contact your desired cam company to try to get close to the results you desire.
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I mean mine is pretty mild but its not a daily driver. Its a 355 cast pistons pocket ported small valve heads, thin head gaskets, holley street dominator intake with a 2inch spacer, and a holley 750I milled the choke tower off and the cam is a lunati voodoo I think the lift is 507/517 with roller rockers and a double roller timing chain. Its pretty tough to I spray a 100 shot on it and shift about 6300rpm. So I think ur goals are pretty reasonable just be sure to get a nice converter also bc that will feel like 30 hp alone :D
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lets say i install some vortec heads what kind of HP and torque will i be looking at now... think 350 hp and 450lb tq would be possible then... ?
There are so many different combinations nowadays that will make great power with even a bone stock 350 long-block.
As a documented example... Chevy High Performance took a stock Mr. Goodwrench 350 (i.e., the cheapest GM 350) with cast stock-style dished pistons. They ran through many combinations, but with pocket ported Vortec heads (otherwise stock 1.94 intake/1.5 exhaust), 0.041-inch head gaskets Fel-Pro 1003 head gaskets, Comp cams XE 268 cam, Edelbrock Performer RPM Vortec intake and Holley 750 cfm carb and 1 5/8 full length headers. The combination made 401 ft/lbs torque at 3,600 rpm with a peak of 384 hp at 5,700 rpm.
With a 0.015-inch head gasket, larger headers and better mufflers and additional tuning, the same generic Mr. Goodwrench 350 engine made 429 ft/lbs of torque at 3,800 rpm and 409 hp at 5,900 rpm...
They indicated in the write-up that the XE262 cam would make more torque with the same HP. So depending on your build, you probably should contact your desired cam company to try to get close to the results you desire.
thanks for all the great info... i´m going to try to find the whole article and read more about it...
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I mean mine is pretty mild but its not a daily driver. Its a 355 cast pistons pocket ported small valve heads, thin head gaskets, holley street dominator intake with a 2inch spacer, and a holley 750I milled the choke tower off and the cam is a lunati voodoo I think the lift is 507/517 with roller rockers and a double roller timing chain. Its pretty tough to I spray a 100 shot on it and shift about 6300rpm. So I think ur goals are pretty reasonable just be sure to get a nice converter also bc that will feel like 30 hp alone :D
cast pistons with a 100 shot of nitrous seems risky... do you think roller rockers and a roller chain and roller lifters are worth it if its just a daily driver? are how long will they last too? oh and for the record... mine is a 4sp manual tranny...
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Well I wouldn't use nitrous on a daily driver but ive sprayed mine at least 25 times and it still runs great but as far as the timing chain its cheap insurance if your Runing a mild cam that puts more stress on the chain u can buy one for around 50$ as far as the rockers they are fine on the street but for your build I don't think it would be worth the $. But anything over 465 lift I would put screw in studs in the heads and the most important thing is to have to right valve springs for your cam and the installed hight must be within the manufacturs specs
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hey there... i was wondering how much torque and HP my engine is putting out... its a fresh engine but with rebuilt 30 over.. stock heads cam 204 intake 214 exhaust at .05 duration... performer intake.. 650 edelbrock carb, headers and electric fan... any ideas on HP and torque outputs... i was thinking about installing vortec heads.. but its only a daily driver so i dont think its really worth... what do you guys think? thanks for the input..
by the way any ideas for more torque?
Without knowing more of the cam numbers, it's only a guess, but you're probably getting about 290 hp at 4000 and 390 fp at 3500, which are pretty nice numbers without getting crazy. Which cam is it?
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hey there... i was wondering how much torque and HP my engine is putting out... its a fresh engine but with rebuilt 30 over.. stock heads cam 204 intake 214 exhaust at .05 duration... performer intake.. 650 edelbrock carb, headers and electric fan... any ideas on HP and torque outputs... i was thinking about installing vortec heads.. but its only a daily driver so i dont think its really worth... what do you guys think? thanks for the input..
by the way any ideas for more torque?
Without knowing more of the cam numbers, it's only a guess, but you're probably getting about 290 hp at 4000 and 390 fp at 3500, which are pretty nice numbers without getting crazy. Which cam is it?
its a summit cam, lift is... intake 420 and 442 exhaust.. part number is SUM-1102
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I agree with richs numbers, you could put all the carb and 1 7/8 headers on there with the best intake manifold and cam you can buy but your heads are your main restriction, cfm is a unit of power capability in my mind...