I have a 1985 Chevy C10 Pickup with a 305 in need of help.?

Question

I have a 305 that has smoke and compression problems, the rest of the truck is mint. I want to put in a 350 for more power and performance. Should I go with a long block and can the parts be used on the 350 from my 305? Like the oil pan, exhaust, valve covers, etc. or should I just by a turn key engine. Alos does anyone know what the horsepower would be for a typical 350 for this truck.
Thank you for your help.

What about the tranny form the 305 some say it will fit the 350 some say no?

Answer 1

All of the parts from the 305 will work on your new 350 as long as it is a pre 1987 motor(there are differences with the 87 up). They should bolt right on without even the slightest hiccup. And the transmission bolt pattern is the same for all Gm V8s so there should not be any issues there. As for the Hp it entirely depends on how the motor is built, but with very few modifications you should see 280-300 hp easily.

Answer 2

Re your question about chev 305 replacement , as long as you replace your chev 305 with a chev 350 most parts are inter changable you can use the same automatic transmission from a chev 4.3 v6 right up to a chev 454 as the older models had the same bolt pattern but it must be from a chev as you will not be able to interchange parts if you use a pontiac or oldsmobile-buick engine also you will have to make sure your exhaust manifolds have the same bolt pattern . I would recomend a chev target master 350 or if you could find a donor motor out of a older chev impalla or caprice as the were a strong motor and will bolt right in to your truck

Answer 3

The first thing to straighten out is the timing. Here is the easiest way to understand setting your timing without a light. The first thing you can do is set your timing marks at around 8 degrees before top dead center on the compresion stroke. pill your # 1 spark plug and turn the engine over until it blows against your finger. When this is set you just have to set your distrbutor so the rotor points directly at the spot where the spot where # 1 spark plug wire sits on the cap. You should be witin a few degrees from your target timing. If you still have a problem it will not be your timing.If not you would want to eventually set your timing with a timing light. Your next step is to make a quick check of your timing chain. Take your crankshaft pulley and turn it counterclockwise until the rotor starts to move. Than turn it clockwise while watching the rotor and the rotor should turn right as you start turning the crankshaft pulley. If it doesn't turn immediately just estimate how many degrees you turned the pulley and that is the amount of play you have in the timing chain. If there is quite a bit of play there is a good chance the timing chain jumped explaining why the rotor wasn't pointing at # 1 position in the first place. It is usually a good idea to change your timing chain every 60.000 to 80.000 miles.

Answer 4

yes long block,you r intake,fuel pump,water pump,valve covers,exhaust manifolds,moter mounts,will fit each other.and your rear wheel drive truck,305 should have a 350 turbo transmission in it ,the exact factory trans for the 350.most people think your truck would have a metric trans,only with a factory v6.look at trans pan if sqare its a 350 trans.hp is about 275 stock,but add ons like cam,roller rockers,msd ignition,headers adds to your engine per bolt on item.say addind these items i listed,your end horsepower would be 355 horse moter.happy trails

Answer 5

everything should switch fine as long as the engine you are getting still has the 4 bolt valve covers (pre 1987 or 1988)the newer ones bolt in the center of the cover
if you get the newer engine a lot of parts won,t fit
as far as hp that depends on what year engine

the trans will bolt up

Answer 6

Get the turn key, none of the brackets are the same, hell the starter's not even the same, I would go to autozone and see what a rebuilt 305 would cost, I'm thinking about 850.oo, a lot cheaper way to go. Then you know everthing will fit.

Answer 7

scrap all the old 305 junk and go with a nice new gm crate motor

Answer 8

A small block Chevy, is a small block Chevy.

Externaly everything is the same.
The main difference is the piston size, crank, and valve sizes.

Go with the long block and swap your tins. (pans, covers, etc.)

Answer 9

in most cases you should be fine with this idea and as far as your trany goes what kind and how much more power are you going to add