Edelbrock valve springs,any good?

Hi folks!
My motor(69 350 300hp) hits home at 5500 pretty rough with an ugly valverattle/backfire!
Time for new springs i think.They must be the originals from '69..
Its pretty hard to get parts over here,but they have the complete Edelbrock line.
I can get the simple "Performer spring kit" (not RPM/Torker) for dirt cheap here.
Like a lot of the eddy stuff they must be made elsewhere.
A question for you guys:
Will they be somewhat stiffer and make my valvetrain withstand 6 to 6.5k?
I need more RPMs.For this year,there will be the last race at the end of the month!

Thanks!
Ollie/Germany

 

As you guessed, Edelbrock doesn't make them....but, that holds true for nearly all "name-brand" springs. Assuming it's a stock 350/300 hp, and assuming you install them to the correct height, the basic Performer springs will work just fine.

As far as withstanding 6000-6500 rpm, probably not, but there's not enough info to say for certain. Adjusting the hydraulic lifters correctly will help a bit.

 

Yes,this is a bone stock 69 350/300hp out of a Camaro.
I wonder if those eddy performer springs are a bit stiffer than mine?Cam is original.
Well,all i want is 500-700rpm more,thats all..getting away from the bad rattle is the plan..LOL!
I adjusted the lifter on the loose side.On the engine,in idle.Very little preload.
Correct?
Ollie

 

Basically, yes. You want the lifter plunger to be at the top- or nearly so- so it can't "pump up" & hold the valve open. The only thing you need to worry about is that the lifters will sometimes pop the snap ring out. A lot of so-called "anti-pump-up" lifters are just ordinary lifters with a larger/deeper snap ring & groove. (Some lifters don't even have that....)

If the Edelbrock springs don't get you there, try using a hardened .015 or .030 shim underneath them which will help. Since the cam is stock, it's probably the Chevrolet "929", so you shouldn't be close to coil bind with the extra shim (though it's easy to check). The 929 has .390/.410 lift, and the Edelbrock 5802 springs have a 1.700" installed height, so you can shim them up to .030 & still have .050 clearance before coil bind with that cam. (This assumes that you don't have rotators on the exhaust valves, and I don't think you will with that engine.)

Keep in mind that the 929 cam is pretty much done after about 4800 rpm in a 350...so 6500 may be tough to get.

You could even try shimming the stock springs, but they are probably so weak by now that I think it would probably be a waste of time.

Hope that helps.

 

Wow,thats a lot of useful info!
I will use the Edelbrock springs for this last event and shim them a bit.
Then i have this comp XE274H on the way.Yes this OEM cam quits really early,so its time
for another one.Plus the right springs!

What do you think,how much power is in it with the new cam.Opposed to the 929?
Motor is stock except AVS 650,hi-rise dual plane+2 1/4 dual exhaust..
I have the feeling that there will be a huge gain...
Will install matching converter and gears(2.5k+4.11s).

Thanks again.Big help!
Ollie