Join Date: Aug 2000
Location: Trumbull, Connecticut
Thanks everyone for the responses.
I am seeing a steady 10" at 950rpm idle with my E303. It was installed by the previous owner and have not taken the front of the engine apart, so I don't know how it was installed.
It idles slightly rougher than I think it should along with the low vacuum reading. I did a compression test and all cylinders were 165-170psi except for #3, which was in the 145-148psi range. So my thinking is that the valve adjustment on that cylinder might be slightly too tight, causing lower than normal compression and vacuum readings, along with the rougher idle.
Combo is a factory 5.0L short block, E303, Edelbrock heads, 1.6 rockers, 65mm TB, Performer 5.0L intake, 1 5/8" shorties into 2.5" H-pipe & catback, and a Paxton SN89.