are they 64cc and the valves 194 and 160?and are they a good head?even for a 350?

 

you should have casting number 416 heads. Stock, they should have 1.84/1.50" valves, and 58cc. These can be run on a dished-piston 350, if you insist.

 

anyone know what comp. would be with these heads on a 350 with .030 over flat top with 4 valve reliefs?

 

between 10.3:1 and 10.8:1 depending on your choice of head gaskets, and how far in the hole your pistons are at top dead center. Please don't try this on pump gas.

 

see thats what I want to run on pump gas.its not going to be a drager.just want the power.

 

going from 9.5:1 to 10.5:1, on a 300 hp engine, is worth all of 12 extra horses. But at the price of detonation.

 

I wish some others would chime in here, and if you wait a few days, they will. You can't run 10.5:1 with stock 305 heads on pump gas. If your cam is wild enough to allow it, then it's way way WAAYY too big for the 305 heads.

 

so I should be safe on pump gas if I stay below 10.1?
----------
the cam I have is a camp cams magnum 280h with a .480 lift but when I get the 1.6 roller rockers its going to jump up to .510 lift
----------
whats the max lift on the stock 416 heads?I had a stock set of 85 350 and 71 350 heads and ran that cam with those with no problems,and I was told so many times I would have to change my springs but never did and it was a power house from about 1800-4500 rpm and was on a stock bore 350

 

whats the stock comp. ratio on the 305 with 416 heads? is it 8.5.1?
----------
are they wedge or canted heads?or are they different?

 

get new heads

 

can a 305 motor make 300hp and 400ft lbs on pump gas?

 

ya to the flywheel not the wheels. i mean you ccan to the wheel but its wayyyy too much money

 

Yes it will work. No your compression ratio will not be too high. In most cases.
The 5/16" pushrod slots in the heads will need to be lengthened toward the rocker stud when a 1.6:1 rocker is used. The valve guide boss will likely need to be shortened to accomodate the increased valve lift.
If you don;t want to mess with this, stick with the 1.5 rockers.
I suggest Lunati 73943 valve springs and a Comp#4753 spring seat shims to set the installed spring height for max performance.
Stock springs will accomodate the .480" valve lift but do not have enough pressure for high rpm performance.
You can drill and roll pin the rocker stud bosses.
Use colder heat range Champion RV8C spark plugs. Use 92 octane or better.

Will make a lot lot lot more horsepower and exteneded rpm range if you fully port them with larger 1.94x 1.60" valves.
This will make the combustion chamber volume larger which will make the compression a bit lower than you'd expect.
Your exact cr will depend on the piston deck clearance and the chamber volume and gasket used.
http://www.wheelspin.net/calc/calc2.html
You can play with the numbers, yourself, here.
Typical head gasket 4.166x .040
typical piston deck clearance .045" to .025"
Typical piston valve relief volume -5
Typical chamber volume after desshrouding the chamber walls for larger valves. 62 to 65cc.
Stock is 58cc but does vary. Asking 10 people will not tell you what the actual chamber volume is and what your cr will be. Measureing what you got and calculating the variables, will.

There is way more real power to be had in these heads by porting and installing larger valves, than using a 1.6 rocker ratio. .480" is plenty lift.
Spend your money on porting tools, new 1.94x 1.60" valves and a valve job if you want to make power and go fast.
A nice 1.5 roller rocker arm.
http://store.summitracing.com/partde...5&autoview=sku
A good stock replacement rocker arm. This is all the rocker arm i use on my 11 second 406
http://store.summitracing.com/partde...6&autoview=sku

Recurve the distributor for 24deg initial base timing and 32 to 36deg at 3400rpm maxed out advance. (shorten the mechanical advance curve limit to about 10-12deg)
use a 2800 to 3500 stall converter and 4.10's for best results.
If you follow this outline you can and will make suprizing good power with these heads on a 350.
If you just throw them on as is , keep your expectations modest.

 

would I be better to get a 350 or use the 305?I was thinking about getting a set of aluminum heads.wanna stay on the cheap side(price)but not realy sure what to go with,,would the 2.02 and 1.60 valve heads be good or should I go different?also what size runners would be best and what would like 58cc or 76cc be better.not sure about these things.

 

It's pretty obvious that a 350 will make more power.
If you buy a cheap aluminum head you will get what you pay for.
I though you wanted to use 305 heads on a 350 with a 280h cam?
That is how you do it. Yes that involves work on your part. Life is tough.
You're all over the planet now.

A flat top piston 350 with these heads in the modified form I outlined with a comp 280H cam and 1.5 rockers wiith a high stall and some 4.10's will work very well at low cost. Easy 12's with sticky tires.

A simular built flat top piston 305 will also run 12's but needs a stiffer rear gear and a 3500 stalll minimum or a 5speed. It makes less torque and will want to rev higher.
The 350 gets you more bang for the $$$'s.

Here is a very good affordable aluminum head for a 350.
http://store.summitracing.com/partde...5&autoview=sku

2.02 valves are not nessessary or recomended on a 305 motor. 1.94" is best overall.