I have a 1984 (L69) Z-28 but the H.O. 305 was replaced with a GM Goodwrench
350..... I am planning on installing a new Edelbrock performer camshaft and
was wondering how the computer will deal with the swap...? Do I need a chip?
does the earlier 80s computers deal with a cam change ok? I will be running
the factory Quadrajet, Edelbrock performer intake and shorty headers......
Do you need a E -Prom? No. Should you? Yes. The increased spark
timing will make the most of your Cam/Intake combo. You might also want
to get at least some true ratio 1.5 rocker arms. Factory GM stamped rocker
arms may not be exactly 1.5 ratio.
Yes, a few:
Accel Module, coil and plug wires. AC43 thru 45 RTS plugs. A High Flow
cat, a custom 3 inch Y-pipe, and a single 3 inch Cat back exhaust with a
single in single out muffler. The muffler should be a good performance
muffler, and the pipes should have a wall thickness between a 1/16th and a
1/8 of an inch. Smooth mandrel bent is best, welded not clamped. Have them
bring the tail pipe out from under the bumper cover by a 1/2 inch.
While you have the cam out, invest in a High Quality Double roller
timing chain and thrust washer. Since your replacing the cam, lifters and
rocker arms, new O.E.M. spec pushrods should also be used. Why take the risk
of old pushrods being the weak link?
I would also say if the motor has over 60,000 on it, it's time to
change the valve stem seals. As well as check the valve springs. With a
higher lift cam, and exact ratio rocker arms a weak spring will rob you
You hit the milage about dead on... it has somewhere around 60k.....
I already have a set of headers with a matching (mandrel bent/oversized)
Y-pipe...... The car already has a 2.5" cat-back, so the exhaust should be
up to par. (I will be changing that old cat)
I will focus some on the other issues you have brought up.... Thanks for
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