305 h.o
12-12-2010, 10:33 PM
#2
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Join Date: Mar 2002
Location: Byhalia Ms, just south of Memphis
Posts: 381
Re: 305 h.o
what is the 8th dig in the vin, if its a G its an L69 car. yeah, you can make power but how much power are you looking to achieve? those motors have the 816 heads (think that the right casting) and for their time they were decent heads. a set of 081 castings is a better head or you can step up to the world products heads.
being that is a flat tappet motor ya gotta be careful on break in and use the COMP oil or something with lots of zincs and wear inhibitors so you dont roll a lobe.
a mild cam and intake will wake it up, but if your looking for wicked #s a roller block with better heads would be the way to go or you can do a 350.
depends on how fast ya wanna go and how much do ya wanna spend.
being that is a flat tappet motor ya gotta be careful on break in and use the COMP oil or something with lots of zincs and wear inhibitors so you dont roll a lobe.
a mild cam and intake will wake it up, but if your looking for wicked #s a roller block with better heads would be the way to go or you can do a 350.
depends on how fast ya wanna go and how much do ya wanna spend.
12-13-2010, 09:17 AM
#5
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Join Date: Dec 1999
Location: MD
Posts: 2,022
Re: 305 h.o
Go big on the little motor or don't bother at all. In other words, only buy parts that will work well on a 350 or larger SBC. Keep the mods limited to intake, exhaust, and drivetrain. Don't bother touching the heads or valvetrain as the results per dollar will be disappointing. Intake and exhaust work alone (if done right) could put power output around 250hp.
Which Edelbrock intake do you have?
Which Edelbrock intake do you have?
12-13-2010, 11:03 AM
#6
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Join Date: Dec 2010
Posts: 7
Re: 305 h.o
Its a victor somethin i cant remeber, between me and my father in law we have about 4 or 5 of them for sbc. i think my plan is the intake and a holley 650 wich i already have, and headers and a cam. Maybe run straight pipes and turn downs. Its already got a posi and i believe the factory 3.23 gears, and i have a built th350 with a shift kit to throw on it when the r200 blows up.
12-13-2010, 12:04 PM
#7
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Join Date: Dec 1999
Location: MD
Posts: 2,022
Re: 305 h.o
Victor, Super Victor, Victor Jr, doesn't really matter, they're all overkill for a basically stock 305. The last thing you want is a single plane on a small displacement motor that doesn't like rpm.
Best bet is a Performer RPM.
3.23 was not available on the HO cars. 3.42 was standard for the auto with 3.73 being optional. Too bad about it being an auto (rare for the HO), as they worked best with the T5.
Your transmission is a 700r4.
The cam is a big waste of time on stock heads. If you want to put a bigger cam in it at least get a set of Vortec heads. The usual intake, headers, Vortec heads, and a 220+ duration cam should be close around 300-320hp.
Finally, if you swap out the carb for something that isn't computer controlled, you must replace the stock computer controlled distributor with a regular HEI unit.
Best bet is a Performer RPM.
3.23 was not available on the HO cars. 3.42 was standard for the auto with 3.73 being optional. Too bad about it being an auto (rare for the HO), as they worked best with the T5.
Your transmission is a 700r4.
The cam is a big waste of time on stock heads. If you want to put a bigger cam in it at least get a set of Vortec heads. The usual intake, headers, Vortec heads, and a 220+ duration cam should be close around 300-320hp.
Finally, if you swap out the carb for something that isn't computer controlled, you must replace the stock computer controlled distributor with a regular HEI unit.
Last edited by Marc 85Z28; 12-13-2010 at 12:07 PM.
12-17-2010, 10:57 AM
#9
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Join Date: Jul 2002
Location: Friendswood, TX, USA
Posts: 3,769
Re: 305 h.o
With only $500 I would do a tuneup, highflow air cleaner, cheap headers, and see if I could fine a used 3:73 rear end or gear for it. I would not put the intake or carb. on it, unless you could find a dual plain and a smaller 4 barrel. As, what you have is over kill for a 305.
Then, while your saving for something better you can think about what you want for this car, or even if you really want to do anything at all. It may be you wanted a 4th Gen. but couldn't afford one.
Do you want a 1/8th or 1/4mile track car or a sport track car, a show car, or some combo.?
In any case Third Gens. make great cars for mod'ing. They're modern but simple. I bought my 84 new and can't see ever selling it.
Then, while your saving for something better you can think about what you want for this car, or even if you really want to do anything at all. It may be you wanted a 4th Gen. but couldn't afford one.
Do you want a 1/8th or 1/4mile track car or a sport track car, a show car, or some combo.?
In any case Third Gens. make great cars for mod'ing. They're modern but simple. I bought my 84 new and can't see ever selling it.
12-19-2010, 02:57 PM
#10
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Join Date: Dec 2010
Posts: 7
Re: 305 h.o
Im wanting it to be a 1/4 street/strip car. I just want some more power for now until i have the money to build or buy the engine i really want. i doubt ill even put 500 in the motor for now, i might jus do some cheap headers and straight pipes and maybe an air cleaner for now, use the rest to go throw the suspension and brakes. the motor runs good, it gets me from A to B and has a decent amount of *** for a 305. Where do i look on the car to figure out what gears i have?
12-19-2010, 06:53 PM
#11
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Join Date: Mar 2002
Location: Byhalia Ms, just south of Memphis
Posts: 381
Re: 305 h.o
to find out what gears you have there should be a sticker in the console comp. look in the G section of the codes and post up here and one of us can gladly tell you what you have from that RPO code.
if you dont have the sticker anymore look under the seat for the build sheet and CAREFULLY pull it out, this also will have a listing of the codes. if neither one of those are there then you can cound the rotation math way. someone here can chime in on how that works.
if you dont have the sticker anymore look under the seat for the build sheet and CAREFULLY pull it out, this also will have a listing of the codes. if neither one of those are there then you can cound the rotation math way. someone here can chime in on how that works.
12-20-2010, 07:53 AM
#13
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Join Date: Jan 2010
Location: Prague, Czech Republic
Posts: 5
Re: 305 h.o
Originally Posted by www.differentials.com
What gear ratio do I have?
Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns, you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.
Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns, you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.
12-21-2010, 09:29 AM
#15
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Join Date: Jul 2002
Location: Friendswood, TX, USA
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Re: 305 h.o
Yes, but what size are the primaries. If, for instance, you get them with 1 1/2in. primaries, these may be to small for a modified 350 engine. So you may want to spend just a little more and get a set that has the 1 5/8in. primaries.
That's what Marc 85Z28 ment by the statement below.
That's what Marc 85Z28 ment by the statement below.
Marc 85Z28 Go big on the little motor or don't bother at all. In other words, only buy parts that will work well on a 350 or larger SBC.