Correct mapping for Camshafts

[Programmer]

Steve,

Thanks for the tip--I'm going to pass this along to the owner to see if he
still has the spec card on the cam...

Lyndon.
-----Original Message-----
From: steve <steve at roundmailingsystems.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: October 27, 1999 6:51 AM
Subject: Re: Correct mapping for Camshafts


>i had the same problem in my 89chevy truck, didn't make power til about
>3000 rpm
>called comp cams cam help  1-800-999-0853. they informed that my crank
>had
>4 degrees retard ground in from the factory. i bought one of their
>timing sets that
>has double roller chain and triple indexed crank sprocket, degreed the
>cam and
>the power band came down to where it should be
>steve
>
>Programmer wrote:
>
>>  Hi guys, Got a guy I'm trying to help out at a neighboring shop. He's
>> got a customer with anAWLB Prom (90 GM 5.7L C15 Truck) and the wrong
>> camshaft. Right now, the guy has put a Comp Cams 280H (.480 Int/exh
>> and 280 degrees duration) in his bone stock truck engine, has only 14"
>> vacuum at idle (needless to say his truck is really overfueling). Runs
>> like crap till around 3000 RPM because of the overfueling. Only other
>> modification on the truck is headers and a dual exhaust. What's the
>> plan of attack to correct this, based on differing parameters in the
>> PROM ? I realise this is a 16146299 ECM, and I'm working on an *.ecu
>> for this one right now...but ideas from a 7747 would really
>> help. Thanks--I'd appreciate straight answers and not things like "he
>> chose the wrong camshaft" <g>. I'll at least admit I'm not sure how to
>> reduce fuel vs. MAP. Lyndon.
>