im kinda noob at all this and i just wanna get a bit more power out of the car. my brother sold me the car before he left for the navy and before he sold it to me he said he swoped the old trans with a iroc and put new headers, exhaust, lifters, and clutch thats about it, i want the upgrades to be cheap but i dont mind prices that much. i have the car parked for the winter so i plan on taking the engine out and working on it at school, so i can do just about anything. ive taken apart and rebuilt engines and they still ran so thats a plus. i never had the chance to rebuild and engine with performance parts so why not mine, its just i dont know what parts to changed and what parts will increase my horsepower i also have no idea what companys to go with. thanks alot ahead of time and sorry if makeing my self sound completly dumb

 

I know that others are going to say this sooner than later, but SEARCH!

That being said, the 305 is a good solid engine that can take alot of abuse and can make alot more power than stock.

The key to these cars is in the PROM.

 

yep if your going to modify it and stick to fuel injection it sounds as if the key is in the tune (i haven't modified 1 yet but, am in the process of building up a lg4 305 with 416 heads)......

The biggest mods you will notice on that motor would probably be better flowing heads, port your stockers or buy some heads off the mid 80s cars (416 casting is a good 1 so are 601s and plenty of others)and port them. I've been told with a ported set you can surpass the vortec headflow.

Type in sitting bull in search and click his port and polish post and read up on it. I just started porting my 416 casting and i printed out the whole article to reference it. There were also multiple users who've flow tested these mid 80s heads getting a considerable increase in flow.

After porting the heads you will want a 3 angle valve job and more than likely bigger valves, stocks were 1.84 and 1.50 i'd stick 1.94 and 1.6s in it (thats what i'm going to do to mine).

The other biggest problem was the cam, they were pretty pitiful for performance. I'd take a look at the comp extreme energy line which can be found a summitracing or jegs. The cam alone will probably cost you like 110.00 new. You can buy a cam and lifter kit with new roller timing chain, new hydraulic lifters and , new springs and hardware for about 310.00 (probably the route i'll go). A popular grind is the comp xe262h grind which is what i'm probably going to go with unless i can get a deal on a roller cam.

You can also buy stroker kits for these beasts!!! Throw a 400 sbc crank in it and you come up with like 334 or 335 cubes. It's a nice imncrease over stock and the torque band should feel a bit better with it. These kits with crank pistons rings flexplate/flywheel and dampner will cost you from about 600-1000 or a little more depending on how it's balanced or the quality of the parts.

Anyways my engine with 600 cfm induction, a dual plane manifold, long tube headers, ported heads with 1.94/1.6s and a comp xe262h cam dyno'd out to about 300 hp on dd2000 with about 350 trq.