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#1 |
Registered User
Join Date: Feb 2011
Location: Chula Vista, CA
Posts: 34
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Help me jack up my 305 Short-Block
I have an '86 C10 Silverado I got on Craigslist last summer for cheap with a rebuilt 305 and TH350 Tranny. I did all the body work, painting and replacing parts so it looks good, got a flowmaster so it sounds good and now I want to figure out what I can do to make it run like a beast... I know, I know 'ditch the 305 for a 350...' but I'm tryin to work with what I've got!
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#2 |
Registered User
Join Date: Oct 2010
Location: Prince George BC
Posts: 8
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Re: Help me jack up my 305 Short-Block
Hey Bud nice truck, im running the same year long box with the standard and a 305. Its pretty basic to make more horsepower, and you'll hear this over and over again. Intake and exhaust, put a open element air filter on it, and a set of headers. right there you'll find just over 15 hp and faster acceleration. if you want to get another 20-30 you can pull the heads off, and swap them with 97-up 5.0 vortec heads. It's a direct swap, all you need for it is a gasket set and a different intake, personally Im going with the edelbrock performer vortec intake, that nets you another supposed 10-15.
And you could do a cam, electric water pump, electric fan, msd ignition. Minus the cam everything is pretty much a bolt on and can be done in only a few hours and you could get roughly 100hp over stock. On a motor that I believe came with 220 at factory. Just my .02, and my plan for my chevy :P Jensen P.S. Damn near everything you put on your 305 can be swapped to a 350 when you give up on the mouse motor Last edited by jensenstage1; 02-24-2011 at 02:35 AM. |
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#3 |
Registered User
![]() Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: Help me jack up my 305 Short-Block
Preformer intake..headers..ignition...maybe a small cheap cam..Save up for a 350..No hate for 305..you could score a running 350 for tha price of vortec heads & matching intake...
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#4 |
Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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Re: Help me jack up my 305 Short-Block
I hope you have thick skin. A lot of 305 haters on here. But ^^^ are right, it's just like any SBC in the way of upgrading. I have a 268he cam in mine and so far I love the sound of it.
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RIP ELJAY ![]() ![]() Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby |
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#5 |
Registered User
Join Date: Dec 2008
Location: Foristell, MO
Posts: 418
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Re: Help me jack up my 305 Short-Block
Drive like it is and save your cabbage for a 350 if you need more azz. No sense spending money on interchangeable parts (IMO) you'll stil need to spend more to have something to interchange them with. With the price of fuel you may want to go the other way.
xrcr |
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#6 |
NOT REALLY BANNED!
![]() Join Date: Jul 2004
Location: Shawnee, KS
Posts: 1,072
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Re: Help me jack up my 305 Short-Block
Fab a turbo kit for it, problem solved. Do they have E85 up there in MN?
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1987 Mustang Coupe - 2.7 Stroker, 78mm turbo, Stainless header, 3" Exh, FMIC, 160lb/hr Injectors, MS3, twin walbro 255's, 34psi. Eating V8's daily. 04 Pontiac GTO 04 Ford Mustang GT 68 C20 LWB stripper truck 73 K5 Cheyenne 76 C20 Sierra Crew SRW 88 K20 Suburban I'm not hammering on metal just to hammer, i'm creating a piece of art. |
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#7 |
Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: Help me jack up my 305 Short-Block
Drive the 305 like it is and save for a big block. You'll be money and power ahead.
Yep, I'm one of the 305 haters ![]() |
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#8 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Help me jack up my 305 Short-Block
save $$ unless it bolts up to both
heck flip the air breather top helps with gas mileage IMO .....thats a cheapie fix
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 Last edited by motornut; 02-24-2011 at 11:10 AM. |
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#9 |
Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
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Re: Help me jack up my 305 Short-Block
I agree. Start small like with ignition, then headers and intake/cam at the same time. You could also try to swap in a better gear in the rear end. I recently put a 3.42 behind my 305 and 700r4. It cruises very well now. Good luck.
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Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
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#10 |
Project: years too late.
Join Date: Dec 2007
Location: Almonte,ON,Canada
Posts: 550
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Re: Help me jack up my 305 Short-Block
I dont know why there are so many 305 haters, I managed to build my 305 vortec in my 98 to push 270 to the rear wheels. So like 310-325? at flywheel?
I also have an 86 K1500 with a 305, and even i plan on building it. Not anything extreme but better. if you haven't already, do a tune up (Plugs, wires, Dizzy cap, Rotor, Vacume lines) then Open element K&N filter Headers (I recomend Longtubes) True duals (if you dont already have that.) 305 Vortec heads off 96+ Vortec Intake Carb Spacer (I think they work) Cam (I have an RV cam in my 86 already) MSD Ignition (you will notice better throttle response) and even if you realy wanted to you could put heavier jets in your carb, or get an aftermarket carb. I dont see anything wrong with the old rochesters tho.
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1971 C10 Stepper LSX 5.3/4L60E 3.73 12bolt posi. Father Son Project. In Memory of Bruce C. Shorten. Rest easy Dad. Ill take it fryom here. Last edited by Ol'Rover; 02-24-2011 at 12:44 PM. |
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#11 |
Registered User
Join Date: Feb 2011
Location: Chula Vista, CA
Posts: 34
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Re: Help me jack up my 305 Short-Block
Dang thanks for all the info! I'm fairly new to the performance/adding horsepower game so I didn't have much of an idea on where to start or what I could do. I've contemplated saving up and dropping in a 350 or even 454 in it but at the same time it seems like an added challenge to try to get the underdog 305 to perform and kick some tail!
1BADSS: Not much in the way of E85 here, some places do but not many...which doesn't make sense since the only thing anyone can grow on this tundra is corn... I moved here from CA in November (big mistake weather and road conditions-wise) but they have E85 everywhere out there. |
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#12 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,149
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Re: Help me jack up my 305 Short-Block
Add TPI fuel injection. Tuned Port is really designed for 305. It will really wake it up. You can probbaly find a complete F-body 305 setup with harness for under $500 if you look hard enough. Use an 87 fuel tank and swap the pump and hoses and you are good.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#13 |
Registered User
![]() Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: Help me jack up my 305 Short-Block
Last edited by Pop's C-10; 02-24-2011 at 07:52 PM. |
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#14 |
Project: years too late.
Join Date: Dec 2007
Location: Almonte,ON,Canada
Posts: 550
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Re: Help me jack up my 305 Short-Block
I wouldn't worry about TPI, or Heads... They could cost you money $$,
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1971 C10 Stepper LSX 5.3/4L60E 3.73 12bolt posi. Father Son Project. In Memory of Bruce C. Shorten. Rest easy Dad. Ill take it fryom here. |
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#15 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: Help me jack up my 305 Short-Block
wow! I WAS a 305 hater! but a 325 hp 305 isnt so bad.....looks like the 262 comp cam is the way to go..I have a performer intake allready and was thinkin about getting headers someday, maybe a cam as well...not sure about putting on a 750 dp tho... with gas at $120 per liter!
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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#16 | |
Registered User
Join Date: Feb 2011
Location: Chula Vista, CA
Posts: 34
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Re: Help me jack up my 305 Short-Block
Quote:
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1986 Chevy C10 305 5.0L Work in progress... |
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#17 |
Registered User
![]() Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: Help me jack up my 305 Short-Block
305 haters are like 4.8 ls haters...yea more cubes equal more horses, but you can do pretty good with a 305/4.8ls driver. I have a stout 350 in my camaro i'm itching to drop in mine, but i wanna see how this 305 treats me as far as millage, dependality ability to do what i need it to do.
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#18 |
Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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Re: Help me jack up my 305 Short-Block
The haters live in engine drivetrain. Lol I wish my muffler sounded better or I would post up what my 268 can sounded on my 305. Pretty nice!
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__________________
RIP ELJAY ![]() ![]() Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby |
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#19 |
Garage wrench
Join Date: Feb 2008
Location: LaCrosse, WI
Posts: 1,855
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Re: Help me jack up my 305 Short-Block
I say nothing wrong with the little 305. Best money spent is like suggested above, things that can/will transfer over to a 350 if you so choose to go that route should you blow up the 305.
And yes, it does suck for winter driving around these parts. I am about 2.5 hours SE of the cities. I park my suburban in the winter. You picked the worst time to move to this area. The spring/summer/fall months are awesome. But, I have noticed that the general conditions of the pavement on the roads in the twin cities and in Minnesota in general are not the best, reguardless of the weather conditions.
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-Adam 90 V1500 GMC Suburban 350/700R4/NP241..... 01 Saturn SL1 stock DD..... Last edited by SBTork; 02-25-2011 at 10:38 PM. |
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#20 |
Registered User
Join Date: Dec 2009
Location: Epping, NH
Posts: 605
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Re: Help me jack up my 305 Short-Block
I used to buy into the "305 is junk, you need a 350" garbage, until I owned a 305. I think part of the reason the 305 got such a bad rep was they put so many into Camaros and the Mustangs could kill them. Took an IROC with a 350 to take a 5.0 GT. One of the best trucks I ever owned was an 81 K20 with a swapped in 305 out of an old Impala. All stock, q-jet and iron manifolds. I plowed hard for years with it, ran 35s all summer, and towed a 24 foot camper. It would spin the 35s if I tried real hard, got okay mileage (for what it was) and never, ever, felt slow or underpowered. I couldn't break it, and I've broken plenty of small and big block Chevys. I've owned built and stock big and smallblocks, and I just can't say enough good about that truck. Over the years I actually bought both a 350 and then a 454 to rebuild and put in the truck, just to make more of a hotrod out of it, but I was waiting for the 305 to die and it never did. Ended up selling the motors and leaving the 305 alone. I sold the truck for only $1000 less than I paid for it after several years of faithful service.
So put a checkmark in the 305 lovers column.
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1982 Chevy K30 CCLB fleetside. Formerly a cab and chassis, now a fleetside dually with the rear wheels tucked underneath. 454/th400/np205/C14/D60, 6/4 inch LIFT, not drop. Last edited by DetroitDan; 02-26-2011 at 10:15 AM. |
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#21 |
Project: years too late.
Join Date: Dec 2007
Location: Almonte,ON,Canada
Posts: 550
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Re: Help me jack up my 305 Short-Block
I have managed to find the weak spot in these motors lol... Rod Bearings. My stock 305 vortec in my 98 found the revlimiter in the wrong spot one night Around 7200 RPM.. (Computer flaw) The next morning i started it at my buddies house and it started knocking reaaaallly bad. then 2 months later after i just packed up my tools and quit my job at canadian tire, on my way home right across the highway from my house, she died. Oil pressure dropped and it just stopped running. SO as i see it... pretty damn dependable motor. It even got me home (within walking distance)
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1971 C10 Stepper LSX 5.3/4L60E 3.73 12bolt posi. Father Son Project. In Memory of Bruce C. Shorten. Rest easy Dad. Ill take it fryom here. |
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#22 |
Registered User
![]() Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: Help me jack up my 305 Short-Block
I keep seeing 305 vortec..i had no clue that there was one....learn something new all tha time
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#23 | |
Project: years too late.
Join Date: Dec 2007
Location: Almonte,ON,Canada
Posts: 550
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Re: Help me jack up my 305 Short-Block
Quote:
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1971 C10 Stepper LSX 5.3/4L60E 3.73 12bolt posi. Father Son Project. In Memory of Bruce C. Shorten. Rest easy Dad. Ill take it fryom here. |
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