I have a 89 Camaro RS. I have took the computer system out. It now has a 4 barrel intake and 600 Edelbrock carb. Im looking to make a drastic change in how much fuel i put to the engine. I am putting a Comp Cams (Magnum Cam 305 adv. duration in it.

My question is ... By porting the stock heads to match the gaskets will i have enough flow of fuel to support a dual quad setup.

I already plan on drilling, pinning, and putting triple springs on.

 

What is it you're trying to accomplish, exactly?

 

i want to put 900cfm to the engine. to feed the 305 duration cam with the stock head. what can i do to the stock heads.

 

900cfm through a 600cfm carb?

 

Through a 200 CFM aircleaner, too..

You're going at it completely backwards. What are you trying to build?

 

I dont know what heads you have on your motor but if they are the 187 heads they are junk like everyone has said. I have an extra set and I decided to take a close look at them. Once I got the intake valve out I gave up thinking I could do anything constructive with these heads. You might be able to help them a teeny weeny amount but for any decent power forget it.

 

ok so you guys have me all wrong..... lets start over. chevy 305 with a comp cam 305 duration.

after head the top end will TWO 450cfm four barrel carbs. so...

what can i do to the stock heads to handle the fuel?.... Is port matching them to the gaskets enough?

 

Stock heads, no port matching is not enough. They will need a full and complete overhaul. If you go by stages, consider what you'll have to do them a stage 3 port job. And by then, you're still going to be severly over-cammed, assuming the rest of the engine is stock.

 

^ i have had this engine apart before and when i turned the heads over i noticed there wasnt much room to inprove on valve size. Maybe theres more than i think but it doesnt look like much. I want a better flow while keeping stock valves. i dont want to dump alot of cash in this engine. just make it run without complication regardless of hp & torque.

 

Is this the cam you're going to want to use:
http://store.summitracing.com/partde...8&autoview=sku

So let me get this straight:

Dual Quad 450cfm carbs (for 900cfm all total) and Dual Quad manifold
Stock heads ported to hell and gasket matched
Comp Cams cam for the 3k-7k rpm range

Those parts right there alone would be around $3000, throw in the machining and parts required for the cam and you soon make it upto around $4000.

This won't work. The stock heads would never flow 900cfm even if they were ported beyond all reason AFAIK. That car would have zero streetability, it would have to be a drag only car.

An engine is a very delicate thing. You can't just slap on dual quads and call it a day. You have to upgrade each component in order to compliment the other components. This is all about synergy. The final result is greater than the sum of its parts.

 

If you want to just make it run and not invest alot in it, heres what to do:

Ultimate TBI Mods (they're free)
New fuel pump and AFPR $250
EBL and tune $500
Headers $820 http://store.summitracing.com/partde...5&autoview=sku
3" Cat $65 http://store.summitracing.com/partde...5&autoview=sku
3" Cat Back Exhaust $400 http://store.summitracing.com/partde...5&autoview=sku

$2100 and you'll go from 140rwhp to about 175rwhp.

Hope this helps.

 

Forget thinking about fuel. Getting enough fuel into the engine is never a problem.

Power comes from the heads. Make the heads flow as much air as you need for your desired power level. Then, choose a cam to match the heads. After that, you can choose the rest of your components to match your heads and cam.

The carburetor itself is one of the least important parts of the system. Starting with a big carburetor and working your way down ends up in a disaster. Starting with two carbs is an even worse idea. Multiple carburetors were a way to provide for more airflow when all anyone had to work with were the small factory carbs. About 40 years ago though, the aftermarket started coming out with a selection of larger carbs. Since then, you'll only see duals on show cars, or highly specialized applications.

 

This is probably going to sound dumb, but how do you tell if you have 187 or 416 heads, the only numbers I could find on my heads is 14022601?

 

Those are 601 heads. It's the last 3 digits of the casting number.

 

Thanks, 601s any good?

 

They're on point with 416 castings. Considered the "better" of the 305-type castings. But, they're still stock castings.

 

A lot better then 187's

 

The engine you see in my advitar is the engine im talking about doing that to. the engine runs great. car has hooker headers and dual exhaust.

... I already have gear drive, 305 dur. cam with lifters, longer pushrods for the tappet cam, triple springs, crane roller rockers, Crane stud girdles, edelbrock tr1 tunnel ram, two 450cfm holley carbs. ....

wouldnt you want put that stuff to use? my problem is the heads. im not buying a new set for this block. i was hoping i could port match the gaskets and slide by.

if not... then ill just buy a new block and use my double hump heads

 

i have one tunnel ram engine... once its brought up to temp its very streetable.

the money does rack up fast. But like i said earlier i have that list off parts with other misc. stuff... Now i want to put it to use in my camaro. The heads are my holdup

 

with the triangle of death air cleaner eh?
ooh man, where are you getting your engine advice from? dual carbs, 305 duration cam (with absolutely no useful specs), triple springs, stock TBI heads, triangle of death air cleaner... ouch!!!

 

If I had those parts, I'd want to put them to good use too, but they aren't meant for a street car. Like I said, that cam is for the 3000-7000rpm range, so you'll have no streetability. Also you'd need heads to accept a .600" lift cam. Also, those heads would have to flow 900cfm. You can't get the stock heads to do either. Pure and simple. The only way that I would think its remotely possible for either of those two conditions to happen is if you had insane amounts of machining done on the heads, and thats a very big if right there. Also, I've seen alot of people on here recommend gear drives for race only applications.

I'm not saying a single carb tunnel ram setup isn't streetable.

I am however saying a dual quad tunnel ram setup with a cam meant for the 3000-7000rpm range is not going to be streetable. It wouldn't even work with the stock heads.

Post up your parts list and tell us what you are wanting to do. Because it seems that what you want to do and the parts you are going to use to accomplish that don't match up. Do you want to get the car going and just be a DD, or is going to be a drag only car? I'm confused because you've said you don't want to spend alot of money to just get it running, but you have all the parts for an all out drag race car minus the heads.

Your parts list as far as I can tell (I know this isn't exactly like yours, I'm just trying to see if were thinking of the same parts):

2 Holley 450cfm 4bbl carbs
http://store.summitracing.com/partde...5&autoview=sku

A Dual Quad Tunnel Ram Setup
http://store.summitracing.com/partde...8&autoview=sku

A COMP Cams cam with 305 duration (closest thing that Summit lists is a 304)
http://store.summitracing.com/partde...8&autoview=sku

And all associated valvetrain parts.

That right there tells me you're wanting an all out drag car. But no matter how you cut it, the stock heads won't do what you want them to do.

Please, tell us what you want to do. Because from the way it looks, we all think you're trying to build an all out drag racing motor with a 305 using stock heads.

 

oh mainly i just want to run the dual quad setup. i have one car with the dual quads on a high rise tunnel ram. Its Steetable!!! Has a 3500 - 7500 rpm cam. Never had a problem driving it around town. i love seeing the engine and letting everyone else check it out.

Anyway... is port matching the heads to the gaskets a waste of my time? Maybe even having the largest intake valve the heads will allow installed too.

Granted i know its now going to be a race machine. i dont even go to the drag strip.

MY GOAL- allow enough flow through heads to be able to mount and tune dual quads so they dont over fuel the engine.
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2 Holley 450cfm 4bbl carbs
http://store.summitracing.com/partde...5&autoview=sku



Same carbs that are on my tunnel ram.... I see if i can get a pic of it on here.

 

On stock heads? Nope. Making the intake valves bigger probably wont help much either. An engine is an air pump. It can only suck in as much as it can push back out. Its simple thing really. Dual quads and a high rise isnt a good idea on stock heads.

 

Thats not possible with the stock heads. Plain and simple. They can't accommodate the cam you want to use, they don't flow enough, and you can't machine them to do what you want as far as I know. You need aftermarket heads, and pretty radical heads at that.

 

the 601s with a full port (not just gasket matching which Ive read and been told numerous times isnt very helpfull since its the least restrictive area of the heads to begin with) are pushing about 200cfm max . Youre not going to get what you want with stock heads,,, period. Look for used aftermarket heads,,, money is tight now a days and there are great deals on stuff right now