'72 350 DPFI vette engine lock...

[mrvette]

been battling this on/off since back from a week vacation....

one day it starts fine....other it's into lockup.....and dumb ass me is thinking timing chain/etc.......and a neighbor said to pull the plugs and see what spews out.....gas/oil/WATER??? and of course because it's been very krazy over the last few weeks.....I"m spend TWO hours in a hot sweaty garage this AM taking the front of the engine off, and then talking to a more AWARE neighbor to re move the plugs, and see if it turns over.....GRRRRRRRRR :dance::sadangel:

[Rodnok1]

If you had ac in the garage it'd be sooo much nicer.

[Steve_R]

So have you pulled the plugs? :leaving:

If you had liquid in one or more cylinders it wouldn’t be intermittent, it would be locked up solid.

[mrvette]

If you had ac in the garage it'd be sooo much nicer.

Tell me about it, up north in a wide single garage I had an A/C unit in the back wall.......wonderful solution....but down here it'a a mess to install one, had an old unit I pushed into a shed doorway, and blocked it off for airflow, worked enough to get me over a project several years go.....a/c unit is long gawn today.....so to suffer with the crap.......damnit.....:sadangel::shots:

[Rodnok1]

As Steve said if hydro locked it'd be done, bdt it's just a wiring/ground issue myself. Gm starter wiring sucks so bad. Always up size the main cable.

[Murray]

The in thing is to just slap one in a door.

YW

[Datawiz]

If you had ac in the garage it'd be sooo much nicer.

First thing I thought of. :rofl::rofl::rofl:

[Grey Ghost]

If it's an on/off condition and seems fine when it does crank/run. Hopefully, it's nothing catastrophic

[mrvette]

If it's an on/off condition and seems fine when it does crank/run. Hopefully, it's nothing catastrophic

Well, cyl #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) intake valve has rust on the valve stem, and #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) /4? was spitting water after rad/system was drained.....lovely.....and so it being a '89 350 truck roller block, and L98 heads with highly modified LT1 with HEI up top in back thanks to a welder buddy of mine......

and having modded the intake, the LT1 gaskets have the back water passages blocked off, I was advised to drill a hole in the gaskets.....about 1/8 or so diameter, to allow water to circulate through hoses to the water pump intake....the holes were blocked off nearly totally....so much larger holes next go round.....trick is we spun engine over with valve cover off, and intake removed....and sprayed a WD type lubs down the intake and spun engine over rather quickly since plugs removed......

BUT the question is, how in HELL can an intake valve be lightly RUSTED on the valve stem/top of valve??? and just where/how the WATER get into either cyl 2 or 4??....

:issues: OH, I checked comp....spun 5-6x and cyl #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) with the rusted stem, measured near 200 psi.....and no leak down....BUT #4 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=4) bled down rather quick and only did ~150 psi......

:issues:

[Grey Ghost]

Well, cyl #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) intake valve has rust on the valve stem, and #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) /4? was spitting water after rad/system was drained.....lovely.....and so it being a '89 350 truck roller block, and L98 heads with highly modified LT1 with HEI up top in back thanks to a welder buddy of mine......

and having modded the intake, the LT1 gaskets have the back water passages blocked off, I was advised to drill a hole in the gaskets.....about 1/8 or so diameter, to allow water to circulate through hoses to the water pump intake....the holes were blocked off nearly totally....so much larger holes next go round.....trick is we spun engine over with valve cover off, and intake removed....and sprayed a WD type lubs down the intake and spun engine over rather quickly since plugs removed......

BUT the question is, how in HELL can an intake valve be lightly RUSTED on the valve stem/top of valve??? and just where/how the WATER get into either cyl 2 or 4??....

:issues: OH, I checked comp....spun 5-6x and cyl #2 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=2) with the rusted stem, measured near 200 psi.....and no leak down....BUT #4 (https://www.thevettebarn.com/forums/usertag.php?do=list&action=hash&hash=4) bled down rather quick and only did ~150 psi......

:issues:

I would think if it was getting oil to that valve stem...it would have prevented rust?

do you think the block could have a crack in a water passage?

[mrvette]

I would think if it was getting oil to that valve stem...it would have prevented rust?

do you think the block could have a crack in a water passage?

I dunno, hate pulling the head, and especially the headers on the pass side,....talk about a CHORE!!!!

:dance:

[dvarapala]

I dunno, hate pulling the head

Knooger loves pulling his... :shrug:

[snide]

Time for an LS swap? :bigears: