Which piston is number 7?

Reply Subscribe

Thread Tools

Search this Thread

Mar 6, 2008 | 10:49 PM

Corvette Don

Thread Starter

Le Mans Master

Joined: Jun 2006

Posts: 6,979

Likes: 31

From: Wichita KS

Which piston is number 7?

I tried a search and nothing really came up but is #7 on the back drivers or pass side?

I am going to do a compression test on it to be SURE I dont have a problem cause I am going nuts now due to the fact I have heard of ppl not knowing they are driving on a low pressure cyl

Mar 6, 2008 | 10:52 PM

corvettedoug

Racer

Joined: Sep 2006

Posts: 389

Likes: 1

From: Roswell GA

It should be on back of the engine on the drivers side if I remember correctly. It is the toughest of the spark plugs to get out.

Mar 6, 2008 | 10:53 PM

futuretech

Drifting

Joined: Aug 2007

Posts: 1,495

Likes: 0

From: Homer Glen IL

I believe it is on the drivers side closest to the firewall.

Mar 6, 2008 | 11:26 PM

Corvette Don

Thread Starter

Le Mans Master

Joined: Jun 2006

Posts: 6,979

Likes: 31

From: Wichita KS

Thanks guys

Mar 7, 2008 | 01:25 AM

PierEagle

Drifting

Joined: Feb 2005

Posts: 1,592

Likes: 3

From: St Louis MO

From radiator to firewall, on driver's side: 1,3,5,7
From radiator to firewall, on passen side: 2,4,6,8

Last edited by PierEagle; Mar 7, 2008 at 01:29 AM.

Mar 7, 2008 | 04:18 AM

vetter79

Burning Brakes

Joined: Jul 2007

Posts: 924

Likes: 0

From: Macedon NY

That's it - 1,3,5,7 on left facing forward. 2,4,6,8 on right!!

Mar 7, 2008 | 09:59 AM

martinezmp

Heel & Toe

Joined: Jul 2007

Posts: 18

Likes: 0

From: Espanola New Mexico

Toss up on hardest sparkplug to remove, #1 is no picnic either.

Mar 7, 2008 | 11:31 AM

Corvette Don

Thread Starter

Le Mans Master

Joined: Jun 2006

Posts: 6,979

Likes: 31

From: Wichita KS

Thanks guys, I went ahead and did a compression test on #5 and #7 as I have heard these are the first to go, well there at 160 each (cold motor, 6 revolutions) so looks like I am good!!!!

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Joe Kucinski

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Verdad Gallardo

Top 10 Corvettes Coming to Mecum Indy 2026!

Brett Foote

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Michael S. Palmer

10 Revolutionary 'Corvette Firsts' Most People Don't Know

Joe Kucinski

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Michael S. Palmer

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Joe Kucinski

10 Most Common Corvette Problems of the Last 20 Years!

Joe Kucinski

5 MOST and 5 LEAST Popular Corvette Model Years in History!

Joe Kucinski

2027 Corvette Buyer's Guide: Everything You Need to Know!

Joe Kucinski

Mar 7, 2008 | 12:33 PM

FRCTony

Drifting

Joined: Mar 2005

Posts: 1,737

Likes: 0

From: Northern VA

Quote:

Originally Posted by Corvette Don

Thanks guys, I went ahead and did a compression test on #5 and #7 as I have heard these are the first to go, well there at 160 each (cold motor, 6 revolutions) so looks like I am good!!!!

In the future, a vacuum gauge is much easier and faster. It will tell you in seconds whether you have a problem.

Mar 7, 2008 | 02:26 PM

#10

Corvette Don

Thread Starter

Le Mans Master

Joined: Jun 2006

Posts: 6,979

Likes: 31

From: Wichita KS

Quote:

Originally Posted by FRCTony

In the future, a vacuum gauge is much easier and faster. It will tell you in seconds whether you have a problem.

Where would I hook the gauge up too? Each cyl?

Mar 7, 2008 | 03:14 PM

#11

FRCTony

Drifting

Joined: Mar 2005

Posts: 1,737

Likes: 0

From: Northern VA

Quote:

Originally Posted by Corvette Don

Where would I hook the gauge up too? Each cyl?

Probably need to get a tee and plumb it into the brake booster line.

You are just reading manifold vacuum, not anything cylinder specific.

Mar 7, 2008 | 11:54 PM

#12

rustyguns

Le Mans Master

Joined: Dec 2006

Posts: 7,251

Likes: 16

From: Phoenix Arizona

Quote:

Originally Posted by FRCTony

In the future, a vacuum gauge is much easier and faster. It will tell you in seconds whether you have a problem.

what should the vaccum gage read ??????????? whats good vs whats bad ?

Mar 8, 2008 | 10:32 AM

#13

FRCTony

Drifting

Joined: Mar 2005

Posts: 1,737

Likes: 0

From: Northern VA

Quote:

Originally Posted by rustyguns

what should the vaccum gage read ??????????? whats good vs whats bad ?

On a stock engine, 18-20" and steady at warm idle.

If you have a cam, you'll have to take note after the install.

The main thing is that it is steady and consistent. It might vary a little depending on weather or altitude, but it must remain steady.

Here is a decent link:
http://www.international-auto.com/in...m?fa=ad&aid=47

Last edited by FRCTony; Mar 8, 2008 at 11:20 AM.

Mar 8, 2008 | 10:36 AM

#14

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

Likes: 180

From: S.W. Ohio. . . . . . NRA Life Member

Quote:

Which piston is number 7?

another way to identify #7 is to change your spark plugs.

The one that is an absolute nightmare to remove; that one that will cause you to invent new cuss words... is #7.