I have a 1990 GTA, which 1.6rr will be a direct bolt on without any machining? What springs would match? Any help is appreciated!

------------------
1990 Trans Am GTA 305 TPI-SLP Tranny Rebuild Kit w/ Mechanical Diode,Vette Servo, Transgo Shift Kit, Stock Vette Converter. Flowmaster Exhaust, Edlebrock Headers, 3 nch Dynomax Hi-flo Converter, K&N Cone Filter, TB Airfoil. Taylor Spiro 8mm Wires and Bosch Platinums. Pioneer DEH 4300, Audio control 24XS, PPI 500IQX and 200IQX Sedona Amps, 15 inch Kicker XPL Subs, and Kicker 4x6/6x9.

 

Crane makes some "centerbolt" style valve cover Roller Rockers which is what you will need. Probably something with double springs would be nice. Machining may be necessary tho. I would check with Lingenfelter Perf Engr to see what they say

 

'direct' replacement?
in many cases yes they can be.
comp cams makes a replacement valve spring
with no modifications to the spring pockets
on your cylinder heads, install @ 1.750"
you might have to clearence the under-side
of the rocker on some models.
late models use a self-aligning rocker. which
means the tips has a channel the valve tip
rides in keeping the tip intact with the rocker.
mainly used without pushrod guide plates.
airdeano