1997 5.7
#3
I replaced the lower intake manifold do to some sludge on my radiator cap. I found a leak in front where the silicone seal's between the manifold and top of block. I installed a new upper manifold as well (plastic), replaced the spider injectors and pump, she has never run this good in a long while. I can now run 87 octane fuel and have no pinging. It has 220k on it. Last time I could run that fuel is when it had 90k on it. Thats when i had my 100k tune up done alittle earlier by dealer, ever since then I always had to run 91 octane in it to prevent pinging. After my repairs i did my testing, service engine light went out, no leaks, when i was reving engine to approx. 3000 rpms i would watch where the injector connection is and it swell in size, rise up approx. 1/8''. Still running strong. Just concerned, you think it would contrac and not expand?
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