Max Output? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

etg · 07-19-2006, 04:39 PM

I am about to get my engine back from the shop from getting a stock rebuild. It's a 350 block with a mild rebuild meaning it should only be to factory specs...i think. What kinda hp can I expect out of this, I understsand its contingent upon other parts but what is the max for the engine itself? I was asking and my friends say its about 225, and i just wanted to make sure. I might pic a different tranny if it is significantly higher.

**Captkaos** · 07-19-2006, 04:48 PM

If it is strickly factory, your looking more like 180hp in my opinion of "stock".

glock35ipsc · 07-19-2006, 04:55 PM

GM's basic stock crate engine is rated at 260hp.

etg · 07-19-2006, 05:03 PM

whoa. These are 2 COMPLETELy different responses. One says far less than I expected and one says far more. What are you all basing your statements on? 180 would make me sad. 260 would make me happier.

glock35ipsc · 07-19-2006, 05:09 PM

I'm basing mine off the fact that my GM Goodwrench crate motor is rated at 260hp. Not saying yours will make that much, but for stock HP numbers, that is where I am drawing my comparison.

FWIW, my 70 K10 was rated at 255hp.

etg · 07-19-2006, 05:24 PM

I forgot to mention that it Was a 305 and I had him convert it into a 350, although that doesnt really matter does it?

glock35ipsc · 07-19-2006, 05:33 PM

Did he use a different block? The 305 bore is 3.74", while a 350 is 4". .260" is a lot to bore, and I don't think it could be done. Stroke is the same, so maybe he used a 350 block? Heads would make a difference too..... I'll go with a range of 200 - 250.

wibilly · 07-19-2006, 07:48 PM

cr, heads and cam will affect the power output but i would agree with 200-250 is in the ballpark

etg · 07-19-2006, 10:38 PM

Yeah I had to pay for a core because he said you couldnt bore it that big without breakin stuff. So 200-250 sounds good. Does adding better parts after the engine add hp or is that the most it will have period? For example headers are supposed to add hp. If my max engine is like 225 can the headers add to that or do they just liberate more of the max?

krue · 07-19-2006, 11:46 PM

Headers, heads, cam, carb, intake...lots of hp adders but you need a plan 'cuz some combos will actually hurt your hp.

etg · 07-20-2006, 01:42 AM

thanks man. Any tips or combos to avoid? I don't really have anything planned for it yet. I have my engine and am ordering a 700R4 tranny. I will include lock up and a stage 2 shift kit. www.maddogtransmissions.com imho this place is the best for trannys that i have seen. Then again i havnt seen many

but yeah what other things should i plan on getting. This will hopefully get good nuff mileage with overdrive to be a daily driver...thinkin 17-20, so power kinda goes out the window with mileage. I know to get headers. I need to get a new carb and intake manifold. What else. I guess what I really need is to start making a list of parts that I need to buy to make my truck run, and then finding good ones.

wibilly · 07-20-2006, 03:25 AM

firs of all you have to figure out what you want out of your engine.your finial drive ratio will determine your cruise rpm. build your engine to perform well at the rpm's you plan on driving it an engine built to make power at 3500+rpm's will disapoint you if it will be run at 2000 rpm"s so you need a plan and pick your componites to match your use if you don't your performance will suffer

etg · 07-20-2006, 03:45 AM

Well I already had the engine rebuilt, and I hope i didn't make bad decisions back then. I will get the spec sheet and double check the engine specs and components and post them for some info/insight. I guess rpm and ration has to do with tranny too? I'm getting a 700R4 overdrive for it. Thats another thing can someone explain tranny lockup to me please? Theres an option for hydraulic lockup for like 130 more, and I dont even know what it is but it has been recomended by almost everyone I talk to, although I don't know what it does.

PanelDeland · 07-20-2006, 11:29 AM

Stock smallblock engines range from the 160 hp figure above to about 375.So it really depends on what engine you started with and the components listed above.I doubt your engine builder started with a 375 hp core so probably between 200-250.Headers,cam and intake will add some.They tend to add more or less depending on the combination.As stated above the best way to build power is to go for parts that work well together.

07-19-2006, 04:39 PM	#1
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Max Output? I am about to get my engine back from the shop from getting a stock rebuild. It's a 350 block with a mild rebuild meaning it should only be to factory specs...i think. What kinda hp can I expect out of this, I understsand its contingent upon other parts but what is the max for the engine itself? I was asking and my friends say its about 225, and i just wanted to make sure. I might pic a different tranny if it is significantly higher.

07-19-2006, 04:48 PM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Max Output? If it is strickly factory, your looking more like 180hp in my opinion of "stock". __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

07-19-2006, 04:55 PM	#3
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Max Output? GM's basic stock crate engine is rated at 260hp. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-19-2006, 05:03 PM	#4
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Re: Max Output? whoa. These are 2 COMPLETELy different responses. One says far less than I expected and one says far more. What are you all basing your statements on? 180 would make me sad. 260 would make me happier.

07-19-2006, 05:09 PM	#5
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Max Output? I'm basing mine off the fact that my GM Goodwrench crate motor is rated at 260hp. Not saying yours will make that much, but for stock HP numbers, that is where I am drawing my comparison. FWIW, my 70 K10 was rated at 255hp. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 07-19-2006 at 05:10 PM.

07-19-2006, 05:24 PM	#6
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Re: Max Output? I forgot to mention that it Was a 305 and I had him convert it into a 350, although that doesnt really matter does it?

07-19-2006, 05:33 PM	#7
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Max Output? Did he use a different block? The 305 bore is 3.74", while a 350 is 4". .260" is a lot to bore, and I don't think it could be done. Stroke is the same, so maybe he used a 350 block? Heads would make a difference too..... I'll go with a range of 200 - 250. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-19-2006, 07:48 PM	#8
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Max Output? cr, heads and cam will affect the power output but i would agree with 200-250 is in the ballpark __________________ common sense isn't so common anymore

07-19-2006, 10:38 PM	#9
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Re: Max Output? Yeah I had to pay for a core because he said you couldnt bore it that big without breakin stuff. So 200-250 sounds good. Does adding better parts after the engine add hp or is that the most it will have period? For example headers are supposed to add hp. If my max engine is like 225 can the headers add to that or do they just liberate more of the max?

07-19-2006, 11:46 PM	#10
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Max Output? Headers, heads, cam, carb, intake...lots of hp adders but you need a plan 'cuz some combos will actually hurt your hp. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-20-2006, 01:42 AM	#11
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Re: Max Output? thanks man. Any tips or combos to avoid? I don't really have anything planned for it yet. I have my engine and am ordering a 700R4 tranny. I will include lock up and a stage 2 shift kit. www.maddogtransmissions.com imho this place is the best for trannys that i have seen. Then again i havnt seen many but yeah what other things should i plan on getting. This will hopefully get good nuff mileage with overdrive to be a daily driver...thinkin 17-20, so power kinda goes out the window with mileage. I know to get headers. I need to get a new carb and intake manifold. What else. I guess what I really need is to start making a list of parts that I need to buy to make my truck run, and then finding good ones.

07-20-2006, 03:25 AM	#12
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Max Output? firs of all you have to figure out what you want out of your engine.your finial drive ratio will determine your cruise rpm. build your engine to perform well at the rpm's you plan on driving it an engine built to make power at 3500+rpm's will disapoint you if it will be run at 2000 rpm"s so you need a plan and pick your componites to match your use if you don't your performance will suffer __________________ common sense isn't so common anymore

07-20-2006, 03:45 AM	#13
etg Registered User Join Date: Apr 2006 Location: San Diego Posts: 147	Re: Max Output? Well I already had the engine rebuilt, and I hope i didn't make bad decisions back then. I will get the spec sheet and double check the engine specs and components and post them for some info/insight. I guess rpm and ration has to do with tranny too? I'm getting a 700R4 overdrive for it. Thats another thing can someone explain tranny lockup to me please? Theres an option for hydraulic lockup for like 130 more, and I dont even know what it is but it has been recomended by almost everyone I talk to, although I don't know what it does.

07-20-2006, 11:29 AM	#14
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Max Output? Stock smallblock engines range from the 160 hp figure above to about 375.So it really depends on what engine you started with and the components listed above.I doubt your engine builder started with a 375 hp core so probably between 200-250.Headers,cam and intake will add some.They tend to add more or less depending on the combination.As stated above the best way to build power is to go for parts that work well together. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"



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