Hopefully the legacy of Avanti Motors will put this question within the "on topic" boundaries.....
I read this groups postings every day and value the wisdom of many - at least they are articulate enough to convince me they know what they talk about when it comes to serious wrenching. I have a question about what I should expect out of a newly built motor:
I own a 1990 Avanti 4-door and recently had a 383 stroker motor built and installed. It runs great, but rough. I'm disappointed in how rough it is. I purposely built it for torque and what I thought would be a smooth runner. By my calculations it is at 9.4:1 compression. It has a cam that is only one or two notches above stock. The machine work included extra for balancing everything as an assembly and clearanced for the 400 crank. I'm using Edelbrock Performer RPM aluminum heads with 1.6 roller rockers. There are Hedman headers with
2.5" dual custom exhaust, but currently no cross over. Could it be that a cross over would help smooth out the engine? I get on it every chance I get (:-) and am getting 15.5 MPG with Tune Port Injection. The power is awesome. I know the ECM is programmed just a hair off (originally was a slightly different cam profile) - everything on it is new including motor and tranny mounts. What should I focus on to help this thing run smoother? I have to have a lid on my coffee (which I always do anyway) or it would slosh out just idling.BTW, on August 18th I'm getting it dyno'd. My guesstimate is it should be 300- 350 HP at the rear wheels and slightly higher torque readings.
Would appreciate your thoughts - thanks!
Rich
Richard Morris Renton, WA
1964 Avanti R-1 #5367 1990 Avanti 4-door #78