Big block engine code E high perform.

[woody82]

I have been trying to figure out this big block engine. It sounds really mean rough idle like it should be in a race car.But when you get on it it is really flat. So I check the timing and rebuilt the distributor .Still the same.The motor showed low vacuum 13 at idle.So I decided to pull it and do some investigating.I got the cam out it is a Erson 20h I can,t find any specs on that number.Inside the timing chain cover the block has a E and a high perf 6 stamped in it The casting numbers on the back check out as a 72 402 2 bolt main. Just wondering if anybody out there has found this.