Drill a hole in your engine block??? - Page 2 - ZR-1 Net Registry Forums

jss06c6 · 07-17-2018

Quote:

Originally Posted by Flyman 27

I can't post you a link here so,

You can do your own search online for "GM Service Bulletin #92-307-6" it is fairly easy to find. Verify it yourself.

Thanks!

Sent from my QTAIR7 using ZR-1 Net Registry mobile app

Bob Eyres · 07-19-2018

Here's a thought. What about drilling out the drain hole as indicated, then pressing in a metal tube from the drain hole exit to below the engine.

Hook up a Shop-Vac to the tube to create positive ventilation under the plenum when you're washing the engine, to avoid drowning your starter.

eh?

rkreigh · 07-23-2018

great idea! then you could also blow it out if it gets clogged

even keeping the hood down and the engine dry, the LSV was one filthy puppy after 104k miles

rkreigh · 08-02-2018

gee I never noticed this before but the hole in the back of the block does have a drain hose on my 95

that would also be prone to clogging up based on the gunk accumulated under the plenum

dcarroll95 · 02-16-2019

Had the car for about 3 months, first time I took the plenum off, got some coolant on top of the engine, so naturally I hosed it off when I put it all back together. Next week starter wouldn't even click when the engine was hot from a 10 minute drive.

Replaced starter with an ebay NOS and DRILLED THE HOLE as per the service bulletin. Cleaned out the original hole as well and cleaned out any gunk or tiny leaf bits that could plug the holes. Tested the ability to drain water out with just the original hole and with the additional 3/8" hole using a hose. Drains much faster (3-4x faster) with both channels. Wish someone who owned the car over the past 29 years had done it for me.

Get a new 3/8" Titanium drill bit and it will cut through the block like it's made of butter. I created a 45 degree guide out of cardboard cut 6" x 6" to help align the drill. I was off by a little bit, but it still worked great. Took off the plenum and the fuel line between the two fuel rails. Don't need to remove the fuel rails or the injector housings.

07-19-2018	#12
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	Re: Drill a hole in your engine block??? Here's a thought. What about drilling out the drain hole as indicated, then pressing in a metal tube from the drain hole exit to below the engine. Hook up a Shop-Vac to the tube to create positive ventilation under the plenum when you're washing the engine, to avoid drowning your starter. eh? Last edited by Bob Eyres; 07-19-2018 at 01:00 PM.

07-23-2018	#13
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: Drill a hole in your engine block??? great idea! then you could also blow it out if it gets clogged even keeping the hood down and the engine dry, the LSV was one filthy puppy after 104k miles __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

08-02-2018	#14
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: Drill a hole in your engine block??? gee I never noticed this before but the hole in the back of the block does have a drain hose on my 95 that would also be prone to clogging up based on the gunk accumulated under the plenum __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

02-16-2019	#15
dcarroll95 Join Date: Dec 2018 Location: ALLEN Posts: 10	Re: Drill a hole in your engine block??? Had the car for about 3 months, first time I took the plenum off, got some coolant on top of the engine, so naturally I hosed it off when I put it all back together. Next week starter wouldn't even click when the engine was hot from a 10 minute drive. Replaced starter with an ebay NOS and DRILLED THE HOLE as per the service bulletin. Cleaned out the original hole as well and cleaned out any gunk or tiny leaf bits that could plug the holes. Tested the ability to drain water out with just the original hole and with the additional 3/8" hole using a hose. Drains much faster (3-4x faster) with both channels. Wish someone who owned the car over the past 29 years had done it for me. Get a new 3/8" Titanium drill bit and it will cut through the block like it's made of butter. I created a 45 degree guide out of cardboard cut 6" x 6" to help align the drill. I was off by a little bit, but it still worked great. Took off the plenum and the fuel line between the two fuel rails. Don't need to remove the fuel rails or the injector housings.