Heres the specs/parts i have tell me what you think

1976 350 010 block 4 bolt main
.90 over(i had to the cylinders where scored)
cam: speed pro .480 lift
stock rods
re manufactured crankshaft
hooker longtubes 1 5/8 primaries 3in collectors
proform 1.5 roller rockers
edelbrock air gap intake
holley 670 street advenger
stronger springs
882 cast heads 2.02 intake 1.84 exhaust
pinned studs
im guessing about 10.5to1 compression bc of the cylinder walls

 

.090 over? Seriously?

What did the cylinder wall thickness measure out at after that?

 

it was .030 over but the cylinders were bad even at .060 over.
but i havent measured it yet but im sure its around 4.090 ?

 

Not the diameter of the bore... the thickness of the cylinder walls.

 

I have never heard of a factory 350 block being bored to 0.090" over. The 70's castings weren't exactly famous for their quality, either. The largest non-400-block piston that Summit lists is 4.080". As stated, I would for sure want to have the cylinder walls sonic checked for adequate thickness.

882 heads have 76cc chambers. I doubt you'll get 10.5:1 CR with them without pop-up pistons (you didn't say what pistons you have). And, 882 heads are horrible for performance. (You asked what we think.)

I wasn't aware Hooker made 1-5/8" long-tube headers for our cars. Did you mean Hedman?

I don't have any particular love for the Avenger carbs. (Again, you asked what we think.)

 

Nice intake.

Sounds like now it's time to find a block, some heads, and a cam, to go with it.

 

DUDE i bet those cylinder walls look like transparency paper .. i think it would scare the snot outta me to build on that foundation... but i hope it works out great for you

 

Get a roller 350 and forget the old 010 "4 bolt main" it's time has passed.

2.02 and 1.84 valves in 882 heads? Fancy sounding boat anchors. I wouldn't put that valve combo in anything and I also wouldn't put those heads on anything but the scales at the scrap yard.

 

How do u tell the rocker arm ratio. Whats a good ratio for a mild 350 built for an 87 iroc-z

 

If you're replacing your cam already, stick with a 1.5 ratio. The 1.6 seems to be if you want a bit more out of an existing cam without having to open up the engine.

There are a lot of reports of cheap aluminum roller rockers breaking resulting in major damage, so I dont recommend that. Plain old stock-style stamped steels will be just fine on a mild engine and will save a lot of money best put other places (like maybe vortec heads or a block that isnt toast)

 

ok i have the engine alomst done to a bare block but i am an a vert tight money limit for this build.

 

So the assembly hasnt started yet? What parts do you currently have?
If you havent bought pistons yet, most of us will recommend you buy a new motor. I dont see any chevy 90-over piston/ring kits, and ones for 70 and 80-over start at $350. I know you could get another 350 motor for much less. Probably a good one too with pistons already and not needing a rebore. Yes they'd probably be dish pistons, but thats money best put somewhere else. Or at the very least, normal size pistons are much more common and there are cheaper high-compression options.

 

I was have a spare motor that is rebuild it came out of a 73 camaro. its a 350. i was thinking of saving that motor as a spare. i have been on ebay looking for engines. this is going to be a driver car. What would u recomend for a good base motor.

 

ok ok, i got an update its only 60 over
pistons are flat top
and yes its headman headers
also 882 heads i herd were a good strong cast, i had 2.02 valves put in them

 

I heard the Earth was flat, once; the Earth didn't seem to be listening though.

Those are some of the worst possible heads to try to force into a performance application. I avoid them NO MATTER WHAT. Back when I built motors for people alot, and bought lots of cores, they would accumulate in a pile by my shop. I used to have to PAY people to come haul them off, along with the 2-barrel intakes they came with, the exhaust manifolds off those motors, the 283s and 327s and later the 305s that I took out of people's cars to get out of the way in the process of upgrading, etc. They were SO WORTHLESS to me, that their value was NEGATIVE!! A larger negative number in fact, than their value as scrap metal. As far as I personally am concerned, somebody ruined a bunch of perfectly good iron by casting it into those head-shaped objects.

Catch me sometime when I'm not on my Sunday best behavior and maybe I'll tell you what I REALLY think about that casting.

Suffice to say, per my original comment, I think you need to get rid of them and start over. You have in your hands right there a carbon copy of the recipe for the CLASSIC disappointment of the late 70s / early 80s, when the early 70s Chevelles and Monte Carlos were at the same point on the value and ownership chain that alot of these cars are on today. You will merely duplicate the same non-performance result that people have been getting from that combo of parts for the last 30-odd years, and hate EVERY MINUTE of it, and regret it every time a Hyundai Accent or Ford Focus beats you out of a spot in traffic.

I would suggest cutting your losses on those heads NOW. Go get something decent instead. Do not argue "I've already got money tied up in these"; that only leads to further bad decisions, and more money thrown away that eventually has to be recognized as a total loss, whereas changing course NOW would result in the least amount of money down the drain and/or a MUCH better chance of ultimately successfully building a motor more powerful and otherwise better than your old stock one. Go here for help learning about and disabusing yourself of that fallacy. http://en.wikipedia.org/wiki/Sunk_costs Read carefully and understand how it applies to your situation.

We can help you make chicken salad out of chicken sh .... something else, to a point; but what you've got listed, I'm afraid is permanently destined to remain the "something else".

Sorry to be so blunt, but it's best to get the truth on the table and help you pull back from disaster, before you've committed any more resources down this path.