I have a 1990 IROC with the L98, headers and 3" exhaust. This weekend I'm putting a HSR with 24lb injectors and while I had everthing off I want to install some 1.6 roller rockers that I have left over from my LT1 build. The head is stock along with the factory cam. Will the 1.6 RR work with the stock springs? Should I wait until later this summer when I plan on installing the new heads along with an LT4 hotcam that I have laying around? Will I have to reprogram the factory prom now? I wanted to wait and program the prom after the head and cam install later this year. Any comments will be useful and thanks in advance.

 

you have probly already done this, judging by the date of the post, but i would not waste your time with those 1.6's until you change the cam. you might be ok with the stock cam, but i don't know that for sure, as far as clearance for the rods goes... i know that when i put that same cam in mine, the heads required some machining to accomodate the higher lift...

 

My pushrods were binding in the slot where they come through the heads with the 1.6's. I used a Louis tool to clearence the head slots.

 

id wait til u get the cam in as well. i have roller tip (full roller wouldnt fit under my center bolt valve cover) rocker 1.6 all the way around i got the self aligning ones wit a mild cam wit stock size 22lbs injectors an my car runs fine with that set up not much difference in power but thats my 2 cents