Engine install, 305 or 350? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

A.P. · 01-05-2004, 07:36 AM

My truck's engine has a double tick in the #2 piston. So I finally have the cash to rebuild it, thanks to the holiday pay. Now to my disappointment, the engine casting # is GM 355909. I checked it out in this site: http://www.mortec.com/castnum.htm. According to the site this engine is a 305.

All along I thought it was a 350. Now what do you guys recommend. Should I stay with the 305 or switch to a 350? I will be using this truck as my daily driver. 45 miles one direction to work, I don't want to spend all my money on gas. That’s why I will not install a BB. My truck is a 72 Chevy short step side, 400 automatic tranny.

A.P.

JimKshortstep4x4 · 01-05-2004, 10:05 AM

We don't rebuild 305 engines, since rebuilding a 350 is so much cheaper. 305's are good engines and if you are concerned about gas mileage, you might find a good one pretty cheap or a good 307 pretty cheap.

Just my thoughts.

Jim

Perchjerker · 01-05-2004, 01:26 PM

put in a 350 crank and haul ASSZZZ!!!

*67Fleetsidedream* · 01-05-2004, 01:44 PM

Go ahead and put in a 350. Sell the 305 and take that money and buy a 350. Your gas mileage will depend on how you build it.

A.P. · 01-05-2004, 06:01 PM

Thanks guys for info. Will get me a 350.

A.P. · 01-05-2004, 08:50 PM

One more question. Are all the parts interchangeable from the 305 to the 350 engine? For example the intake manifold, exhaust manifolds, harmonic balancer, oil pan, and timing chain cover.

A.P.

kaycee · 01-05-2004, 09:10 PM

Yes they will work I would get a 350 balancer though everything else is good to go

A.P. · 01-05-2004, 09:41 PM

kaycee, thanks.

A.P.

*1972C10* · 01-05-2004, 11:15 PM

305s use same crank as 350 so you can use the inerts in a 350 block w 350 pistons

djracer · 01-06-2004, 12:02 AM

I'd rather have a sister in a whorehouse than a brother with a 305!

86SILVERADO · 01-06-2004, 12:14 AM

I am re-building the 305 in my half ton. I like 20 miles per gallon. It cost me 2 and change for the full re-build kit. The good thing about a 305 is that if it was taken care of you can just hone it and throw in all new standard bearings and be good to go. Try that with a 350 that has had the wee revved out of it for the last 20 or so years. My 305 has 150,000 on it and there isn't even a trace of a ridge at the top of the cylinder.

Oh and by the way the 350 is in the C30.

lukecp · 01-06-2004, 12:16 AM

Actually 305 and 350's have different cranks....stroke is the same, but from what i understand, they are balanced much different (305's have light pistons, 350's have heavy pistons).

305's aren't bad motors....they are good reliable engiens that will go for a long time and get decent MPG, but they are weak in the power department (although a friend of mine had a carb converted TBI 305 in a '76 C10 and it ran suprisingly good).

I would much rather have a 350 myself....cheaper to rebuild, and more power!

*1972C10* · 01-06-2004, 12:19 AM

same casting numbers on the crank balancing holes are slightly deeper but wont really affect anything as long as the proper width rods are used Ive got a 350 i just built that has a crank and rods out of a boat 305 X rods and the 3932442 crank i didnt get this motor balanced and it doest vibrate at all .

chevydog66 · 01-06-2004, 12:28 AM

I'm in the same boat. I thought my motor was a 350 also. When I ran the casting #'s I found out it was a 305. It's a good thing a rod started knocking in it. Now I can put a real motor in it. 350 alll the way!!! Anyone want to buy a 305??

Hooter · 01-06-2004, 01:03 AM

305's are poo, enough said

Perchjerker · 01-06-2004, 01:49 AM

Put a 350 crank in a 305, make a 327 high revving and bad asszz horsepower!!!!!!

*1972C10* · 01-06-2004, 01:55 AM

Quote:

Originally posted by Perchjerker
Put a 350 crank in a 305, make a 327 high revving and bad asszz horsepower!!!!!!

UMM NO. All that would be is a 305

305 uses a 3.740 bore with a 3.48 stroke

350 uses a 4.00 bore with a 3.48 stroke

327 uses a 4.00 bore with a 3.25 stroke here is some info on stroke and bore size for sbc

http://www.mortec.com/borstrok.htm

A.P. · 01-08-2004, 09:06 AM

Great, I found a person that wants to get rid of 1971 complete 350 engine. I hope that I will get it this Friday.

As soon as I get the 350 engine I will be donating the 305.

A.P.

01-05-2004, 07:36 AM	#1
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Engine install, 305 or 350? My truck's engine has a double tick in the #2 piston. So I finally have the cash to rebuild it, thanks to the holiday pay. Now to my disappointment, the engine casting # is GM 355909. I checked it out in this site: http://www.mortec.com/castnum.htm. According to the site this engine is a 305. All along I thought it was a 350. Now what do you guys recommend. Should I stay with the 305 or switch to a 350? I will be using this truck as my daily driver. 45 miles one direction to work, I don't want to spend all my money on gas. That’s why I will not install a BB. My truck is a 72 Chevy short step side, 400 automatic tranny. A.P.

01-05-2004, 01:26 PM	#3
Perchjerker Beer Power!!!!!!!!!! Join Date: Nov 2003 Location: Nacogdoches, TX Posts: 280	put in a 350 crank and haul ASSZZZ!!! __________________ Rather be fishin'

01-05-2004, 06:01 PM	#5
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Thanks guys for info. Will get me a 350. __________________ 72 Chevy, SWB, 350engine, TH400

01-05-2004, 09:10 PM	#7
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,446	10-4 Yes they will work I would get a 350 balancer though everything else is good to go __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

01-06-2004, 12:02 AM	#10
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,891	I'd rather have a sister in a whorehouse than a brother with a 305! __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

01-05-2004, 10:05 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	We don't rebuild 305 engines, since rebuilding a 350 is so much cheaper. 305's are good engines and if you are concerned about gas mileage, you might find a good one pretty cheap or a good 307 pretty cheap. Just my thoughts. Jim

01-05-2004, 01:44 PM	#4
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	Go ahead and put in a 350. Sell the 305 and take that money and buy a 350. Your gas mileage will depend on how you build it.

01-05-2004, 08:50 PM	#6
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	One more question. Are all the parts interchangeable from the 305 to the 350 engine? For example the intake manifold, exhaust manifolds, harmonic balancer, oil pan, and timing chain cover. A.P.

01-05-2004, 09:41 PM	#8
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	kaycee, thanks. A.P.

01-05-2004, 11:15 PM	#9
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	305s use same crank as 350 so you can use the inerts in a 350 block w 350 pistons

01-06-2004, 12:14 AM	#11
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	I am re-building the 305 in my half ton. I like 20 miles per gallon. It cost me 2 and change for the full re-build kit. The good thing about a 305 is that if it was taken care of you can just hone it and throw in all new standard bearings and be good to go. Try that with a 350 that has had the wee revved out of it for the last 20 or so years. My 305 has 150,000 on it and there isn't even a trace of a ridge at the top of the cylinder. Oh and by the way the 350 is in the C30. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

01-06-2004, 12:16 AM	#12
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Actually 305 and 350's have different cranks....stroke is the same, but from what i understand, they are balanced much different (305's have light pistons, 350's have heavy pistons). 305's aren't bad motors....they are good reliable engiens that will go for a long time and get decent MPG, but they are weak in the power department (although a friend of mine had a carb converted TBI 305 in a '76 C10 and it ran suprisingly good). I would much rather have a 350 myself....cheaper to rebuild, and more power! __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

01-06-2004, 12:19 AM	#13
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	same casting numbers on the crank balancing holes are slightly deeper but wont really affect anything as long as the proper width rods are used Ive got a 350 i just built that has a crank and rods out of a boat 305 X rods and the 3932442 crank i didnt get this motor balanced and it doest vibrate at all .

01-06-2004, 12:28 AM	#14
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	I'm in the same boat. I thought my motor was a 350 also. When I ran the casting #'s I found out it was a 305. It's a good thing a rod started knocking in it. Now I can put a real motor in it. 350 alll the way!!! Anyone want to buy a 305?? __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

01-06-2004, 01:03 AM	#15
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	305's are poo, enough said __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life



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01-06-2004, 01:49 AM	#16
Perchjerker Beer Power!!!!!!!!!! Join Date: Nov 2003 Location: Nacogdoches, TX Posts: 280	Put a 350 crank in a 305, make a 327 high revving and bad asszz horsepower!!!!!! __________________ Rather be fishin'

01-08-2004, 09:06 AM	#18
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Great, I found a person that wants to get rid of 1971 complete 350 engine. I hope that I will get it this Friday. As soon as I get the 350 engine I will be donating the 305. A.P.

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