Prepping for intake change
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Originally Posted by Redshark6974
i thought you got a 69 quadrajet along with a 68 intake??
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Originally Posted by Missileman
The tach cable bind can be fixed by re-indexing the distributor clockwise so the can points toward the blower motor. A GM service bulletin addressed this in 69 (I think). This is well known and posted many times on the NCRS site. Remember #1 is important: the distributor doesn't care what position it is indexed. Also many have had problems with the tach adapters. They place too much horizontal load on the drive gear and can cause premature failure. My .02
Were have you been Missileman? I just went a few mean rounds with nonbelievers in the Engine Mods section. 
Really could have used the backup. Mostly C2 poeple. They try to blame a dimple mark on dist gear (dist shaft?) for bad alignment and lack of adjustment angle with the large LT1 intake runner as a stop. Where can I find a copy of that service bulletin? We really need to get it posted in the tech tips section.BTW guys remember to turn the oil pump shaft the same amount you turn the dist rotor.
cardo0 
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
1968-1974 Small Block Distributor Alignment
The following is copyright to NCRS. "The Corvette Restorer," Volume 31, Number 1, Summer 2004. My thanks to PRND21 for jogging my memory!
http://temp.corvetteforum.net/c3/paul79//ncrs04.jpg
http://temp.corvetteforum.net/c3/paul79//ncrs04.jpg
Last edited by Paul L; Aug 18, 2004 at 08:09 AM.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Originally Posted by paul67
The following is copyright to NCRS. "The Corvette Restorer," Volume 31, Number 1, Summer 2004. My thanks to PRND21 for jogging my memory!http://temp.corvetteforum.net/c3/paul79//ncrs04.jpg
Thanks Paul. Wish we could put it in the tech tools section. That bulletin really helps but I feel we need something to describe the relationship between the dist gear teeth and advance/retard. Since the dist gr uses 13 teeth we can figure 360* (dist rotation for entire firing order 18436572) /13 (teeth) = about 28* per tooth. And with a plug wire every 45* on the cap, retarding or advancing one tooth plus only about 17* rotation (45*-28*=17*) of dist will cover the distance to the next plug wire. What I'm saying is that one should only need 17* of dist adjustment angle (room to turn dist) to set the intial - anywhere on that cap. And since the crank rotates twice for each rotation of dist, that 17* dist angle is really 34* on the crank (harmonic dampner marks). I would like to see something in the tech tools about this or at least some one tell me if I'm AFU (and prove it).
Sorry if I hijack yer thread a bit Cali. I'll send ur bunny a pancake someday.
cardo0
Last edited by cardo0; Aug 19, 2004 at 12:23 AM.
