Hi Chris

Edelbrock suggests using 1.5 rockers which you need to purchase separately and I bought Comp Cam rockers. I called Edelbrock and checked if I could go with 1.6 rockers, but they didn’t recommend it due to the fact that the springs were .009 shy of what is ideal clearance from coil bind. I could go with 1.6, but I would have to change the springs. Well these heads have huge flow numbers even at .500 lift so I really don’t need 1.6 rockers.

I got the ‘complete heads’ part #60989 e-tec 200 which come with springs and 64 cc chamber heads.

Edelbrock suggests using their roller cam part number 2201 for the earlier style block and obviously I am using part # 2204 for the later style block. With 1.5 rockers they boast 234/238 @.050 and .539/.548 lift and have 112 degrees of lobe separation with 5 degrees advance built into them.

Edelbrock did a dyno test with one of their crate 355 ci engine with only 9.5:1 compression with the e-tec 170 heads along with the combo above and a 800 cfm carb and it put out 435 hp and 435 ft/lbs. The e-tec 170 heads come with 1.94/1.55 valves and flow 232/183 @ .500 lift.

What I am doing for a customer is, I am using the e-tec 200 heads which come with 2.02/1.60 valves and flow 252/196 @ .500 lift. Besides that we are building it as a 383 stroker which will have 11:1 compression. These heads are capable of an additional 40 hp over the e-tec 170s plus the added compression should give us a further 25-30 ponies, not to mention the 10% added cubes. We are hoping for a healthy 500 on both numbers.

God luck. Oh, one note, if you decide to build a 383 stroker, when you set your timing, do not exceed 34 degrees.