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-   -   Performance Chevy 305 (Don't hate me) (http://www.hotrodders.com/forum/performance-chevy-305-dont-hate-me-226252.html)

twenglish1 11-18-2012 09:31 PM

Performance Chevy 305 (Don't hate me)
 
So i just finished rebuilding my first engine, its a 1984 Chevy 305, don't hate me for that, haha. Anyway i am running an 11:1 compression ratio and a mild cam, how much horse power can i expect to get out of it?

Cam specs:

Intake Duration at 050 inch Lift: 234

Exhaust Duration at 050 inch Lift: 244

Advertised Intake Duration: 292

Advertised Exhaust Duration: 302.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.488 in.


Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.

Lobe Separation Angle: 114

I am also using an intake and Quadrajet carb off a late 70s Chevy 400

I just got it mounted on the break-in stand and will be firing it up one day soon!

gearheadslife 11-18-2012 09:44 PM

you check piston to valve clearance?

vinniekq2 11-18-2012 09:45 PM

depends on what your heads flow on a small bore? 240 plus?

twenglish1 11-18-2012 09:50 PM

The pistons do clear the valves, and i am not sure what the heads flow, how could i find out?

vinniekq2 11-18-2012 10:04 PM

you need a flow bench.The bore size has to be adjusted to match your engine.The tech will take readings at .3,.4,.5 inches of lift. with near stock parts you will get moderate improvements over stock ratings

twenglish1 11-18-2012 10:13 PM

I believe the heads are stock except they were milled down from 58cc to 54cc, i was told that would be close to an 11:1 compression ratio and i am using the cam listed in the original post

vinniekq2 11-18-2012 10:24 PM

that cam with stock heads and high compression,stock intake and carb? what about headers and exhaust?Lets ask techinspector to do a cr cam match for you

twenglish1 11-18-2012 10:29 PM

The intake and carb were off a late 70s Chevy 400 engine, right now the engine is on a break-in stand and as far as exhaust all i have on it is headers, they have 3in outlets, thats all i know about them, i am borrowing them

vinniekq2 11-18-2012 10:58 PM

I think that cam is a poor choice for the parts you have listed

twenglish1 11-18-2012 11:00 PM

Like i said this is my first build, i am just trying to learn. Why do you think it is a bad choice?

632Mantis 11-18-2012 11:12 PM

Quote:

Originally Posted by twenglish1 (Post 1613024)
So i just finished rebuilding my first engine, its a 1984 Chevy 305, don't hate me for that, haha. Anyway i am running an 11:1 compression ratio and a mild cam, how much horse power can i expect to get out of it?

We don't hate ya. Congratulations on your first engine. Now you can spend the rest of your life trying to build your "BEST" engine.

Horsepower? Well..... not much i'm afraid.

First rule of engine building: "there is no substitute for cubic inches"

Second rule: "power-adders are your friend!"

Third rule: "be rich. this is not a poor mans hobby"

( That's all for now. Good luck )

:D

632Mantis 11-18-2012 11:17 PM

Quote:

Originally Posted by twenglish1 (Post 1613055)
Like i said this is my first build, i am just trying to learn. Why do you think it is a bad choice?

Nothing wrong with wanting to learn. We all had to start someplace.

Your cam is bad, but even worse... you started with a 305.
It's okay though. I'm sure you learned some good lessons you can apply to your next engine build.

( Think: CUBIC INCHES )

:cool:

twenglish1 11-18-2012 11:19 PM

Quote:

Originally Posted by 632Mantis (Post 1613060)

Horsepower? Well..... not much i'm afraid.

Think it could be close to 300 hp? even though i would be happy if it just runs

twenglish1 11-18-2012 11:22 PM

Quote:

Originally Posted by 632Mantis (Post 1613061)
Nothing wrong with wanting to learn. We all had to start someplace.

Your cam is bad, but even worse... you started with a 305.
It's okay though. I'm sure you learned some good lessons you can apply to your next engine build.

( Think: CUBIC INCHES )

:cool:

Whats wrong with the cam? too big for the 305?

vinniekq2 11-18-2012 11:30 PM

way too big for the rest of the parts,like fbird said. port the heads,aluminum intake,ignition work, etc. If you use that cam with stock intake and heads it will be like fbird said.


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