Titan85

iTrader: (1)

I am replacing my timing chain with and Edelbrock Performer-Link chain and gears. The gears are set up to allow a 4 degree advance or retard. I am considering doing an advance for more low end torque, but am not sure about it due to my limited knowledge.

What are the pros and cons of doing the advance? Also, will I have to mess with the distributor a lot to get it to work?

I noticed that my car had a lot more power after 4,000 RPM and the car also had a slow throttle response. I think someone may have retarded the timing. The chain was also quite worn. I am hoping that a timing advance will give me some more low end power and more throttle response. Should a 4 degree advance help out with this?

Thanks

Damon

Is this a stock motor? If not, what's the combo of parts, including the cam?

Titan85

iTrader: (1)

Yes, it is a stock 305 TPI from an 87 IROC. I believe it is the version that has the hydraulic roller lifters (LB9?). The previous owner had it rebuilt though. I think the cam is still stock.

Damon

1987-vintage 5.0L TPI with the automatic trans? If that's the original motor and trans you've got the infamous "peanut cam" in that engine. It's a teeny tiny little sucker with under .400" lift and under 180* duration @ .050. Do a search for "peanut cam" and you'll see plenty of comments about that cam.

Long story short- nothing will help that cam, certainly not advancing or retarding it a couple degrees.

If you want a nice upgrade, a stock 4th gen LT1 cam is a good starting point and can be had for cheap in good used condition.

Titan85

iTrader: (1)

I believe its from an automatic transmission car. The previous owner did the engine swap so I am not entirely sure.

Would it be worth advancing the timing chain just because I am putting a new one on anyways? I figured since I am already there, I might as well try something. I just don't know if there will be any down side to it.

Would the 4th gen LT1 cam be in any 4th gen z28 or was it a special thing?

Thanks

AlkyIROC

Install it straight up. Without checking piston to valve clearance, you have no idea if advancing or retarding the cam will cause contact.