Cam Install Question

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May 30, 2006 | 07:45 AM

UDLOOSE

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Joined: Oct 2005

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From: Ottawa Ontario

Cam Install Question

Moved To Tech/Perf

I’m installing a S/R, new heads, intake etc. on my 86 L98 and have a few questions for the experts:

When installing the cam, is the timing marks dot over dot, or are both dots at the 12 o'clock position? I 'am getting conflicting instructions from different manuals.

When installing the S/R plenum to the runners, are the bolts head to be in the plenum, or are the nut portions to be in the plenum? S/R instructions are not that clear.

Thanks for the help.

Last edited by UDLOOSE; May 30, 2006 at 02:52 PM. Reason: Moved To Tech/Perf

May 30, 2006 | 11:34 AM

STL94LT1

Race Director

Joined: Jan 2002

Posts: 12,261

Likes: 85

From: O'Fallon Missouri

Quote:

Originally Posted by UDLOOSE

When installing the cam, is the timing marks dot over dot, or are both dots at the 12 o'clock position? I 'am getting conflicting instructions from different manuals.

Yes, dot over dot is the easiest method. Once installed, roatate the crank to see if the dots still line up on the next roatation.

May 30, 2006 | 07:44 PM

TPI

Instructor

Joined: Dec 2005

Posts: 197

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From: Woodland California

Quote:

Originally Posted by UDLOOSE

House of pain if you use the original bolts. The bolts screw in from the out side up into the plenum, but are almost impossable to start because there is little room. The plenum is threaded, but the runners are not. I would buy longer bolts with nuts, and screw them in from inside the plenum, and hold a not in place with a finger, then tighten the nut after the bolt is all the way screwed in. It took many hours of frutration trying to start those bolts. Another guy I met, drilled out the threads in the plenum, and used nuts with a rubber seal on the outside to prevent leaks. Another hint is to remove the distributer cap to get at the driver side rear bolt which is the only one I could start easily from the bottom up into the plenum with dist cap removed. I picked up 5 MPH in 1/4 mi on a mostly stock 86, and I like the super ram, but it is not an easy install. Good luck.

Jun 11, 2006 | 03:42 PM

rachels

Heel & Toe

Joined: Jun 2006

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zz9 experience

just installed zz9 cam from tpis in 1987. dot over dot. good luck.

Jun 20, 2006 | 09:05 PM

A95Y

Burning Brakes

Joined: May 2006

Posts: 985

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From: St. Louis Missouri

I think dot over dot will be firing on #6 and your distributor will be 180 out. 12 to 12 would be firing on #1.

Jun 21, 2006 | 10:45 PM

Balanced 89

Intermediate

Joined: Feb 2002

Posts: 30

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From: Homer Glen IL

If you are installing the cam "straight up" without degreeing it then either method will work for stabbing it in. Remember the crank rotates twice to one cam rotation so if you did dot to dot and rotate crank once then both dots will be at 12 o'clock. Rotate again and you are back to dot to dot which you want to do to confirm you aren't off one tooth. HOWEVER - dot to dot is #6 cylinder at TDC and both dots at 12 o'clock means #1 cylinder is at TDC where you want to be to stab your distributor in.

Are you doing this in the car?