Edelbrock Performer RPM package

[Dan White]

I have a 1966 small block (with a camaro 327) and am planning to outfit it with an Edelbrock Performer RPM package (aluminum heads, intake, cam, valves, etc.). My 327 was rebuilt 20 years ago, and has only been driven on a few short trips since then, totaling 50 miles. I think new pistons were installed during the rebuild, as well as new connecting rods. Will these origional equipment repacements be strong enough to handle the 420 horsepower capabilities of the Edelbrock Performer RPM package? What about my engine seals, do I need new ones? Would it be better to completely rebuild the engine and start fresh?

Tahnk You, Dan White

[Dale Pearman]

Tee-Hee (snicker)

I seriously doubt the 420 HP figure. If it's true you'll be building a first class pain in the donkey for street use!

Dale.

[Duke W.]

420 HP ?

Horsepower is a function of valve timing characteristics, compression, and port flow. So what cam are you running? With the proper cam and head work and at least 10.5:1 CR, you might get 420 gross at about 7000, but it won't be very streetable. Penske'e 302 Trans Am Camaros make about 440 at 7500. Can you build an engine nearly that good? The carburetor and manifold don't mean much until you have done all the other preparation.

Duke

[G B.]

I wouldn't rebuild the short block

Dan -

If you're happy with the way your current pistons, rings, and lower end seals are working, I wouldn't change anything in the short block when you add the Edelbrock package. I doubt you will be running the car extremely hard for long enough to hurt anything in the short block.

Edelbrock used 9.5 to 1 pistons in their dyno 350. Those are probably flat-tops with valve reliefs similar to those used in Camaro 327s.

Edelbrock's curve shows the 420 horsepower figure at 6,000 rpm. I think you might have more fun on the street with the Performer Package rather than the RPM Package. The Performer cam is just a little milder than the 1965-7 GM 327/350hp cam. The Performer RPM cam is fairly radical for a 327 on the street. From the specs I'm guessing it will idle about 900 rpm minimum, and produce maybe 12" vacuum at that speed. You'll probably have to use a low-vacuum distributor advance canister with it. You can use the stock '65 Corvette canister numbered "236". It only requires 9" for full advance.

[John H.]

Don't Use Their Cam....

The cylinder head and intake combination is excellent for street use (have used it on several 350's and 383's), but you don't want the Edelbrock Performer cam; it's nastier than you need, and you won't like it. Use the 327/350 cam or one of the newer grinds from Crane or Competition Cams (call them, give them your combination and intended use, and they'll recommend the right one for you).