I was wondering if a stock motor and intake with just cold air intake and nitrous benifit 1.7 roller rockers I have them allready from another project they where going to go but didn't THANKS for any input and would it give it any diffrent of a idle?
If they are free, then yes there is a benifit, less friction, due to the rollers, but I would not buy them to put on a other wise stock engine. the heads are the weak link on 5.0's, start there then worry about the cam, or 1.7's.
I have read in a few mags that putting 1.7's on stock heads with weak springs can be a pretty bad combo. I would just save them for when you get a set of heads. Even a set of gt40 heads with 1.7's is the same setup ran on the cobra's. Good luck
I have GT40P heads with the 1.7's and new springs and runs good. But I also read that weak springs with 1.7 will hurt power. I might have read that same article. I believe they put it on a 100k motor that was almost all stock and it lost like 10 hp I think.
1.7's will usually hurt an otherwise stock 5.0 (HP wise) due to the valve float RPM being lessened. Stock 5.0 springs and heads are the weak link and don't really flow that well.
If you replace the springs, however, then the 1.7s will be worth a small gain. Probably not a large enough gain to warrant the cost of replacing the springs and time/trouble, but a gain nonetheless.