Part # decipher

[YENKO DEUCE REGISTRY]

Bought a flywheel from the local Chevrolet dealer, and a clutch kit from the NNN swap meet several years ago. Went to put them in the trunk to get them balanced, and decided to check alignment - or not, [img]<<GRAEMLIN_URL>>/frown.gif[/img] The pressure plate mounting holes are nowhere near where they should be, perhaps someone can tell me what these part numbers are:

Flywheel: box # C3991469, cast # on the flywheel itself 3973456

Clutch Kit: box #'s ACD#381146 &amp; GM#88989167

I bought both with the understanding that they were for a 10.5&quot; combination.

[Mr70]

I remember the #3991469 superseded the #3973456 sometime late '69? and is a very common 14&quot; diameter manual transmission flywheel that accepts an 11&quot; diameter heavy-duty clutch,used on internally balanced BB &amp; SB 1955-85 GM w/2pc.crank seal.

Crank Flange bolt pattern,3.58&quot;
Clutch dia.10.4&quot; 11&quot;
Starter ring gear teeth,168



#381146 (88989167) is a 1966-1968 Chevrolet Chevy II base engine clutch.
10.4 in. x 10T x 1-1/8 in. raised diaphragm
10 spline

[YENKO DEUCE REGISTRY]

So, I have the right flywheel but the wrong clutch kit? Is that flywheel used for both 10.5 and 11&quot; clutch kits?

[YENKO DEUCE REGISTRY]

This tick's me off. [img]<<GRAEMLIN_URL>>/frown.gif[/img] Looks like the pressure plate was switched out from the box.

I rechecked the flywheel # and it's for either a 10.5&quot; or 11.0&quot;, so I'm good there. The pressure plate does not line up, so I really don't care what it's for anymore - I need another clutch kit.

Can I put an 11&quot; clutch/pressure plate into a 403 bellhousing, along with the dust cover? I don't really care too much, as I was going with a 10.5&quot; setup initially but if I can stuff an 11&quot; version into the same bell - I'll do it.

[Tommy]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: YENKO DEUCE REGISTRY</div><div class="ubbcode-body">This tick's me off. [img]<<GRAEMLIN_URL>>/frown.gif[/img] Looks like the pressure plate was switched out from the box.


Can I put an 11&quot; clutch/pressure plate into a 403 bellhousing, along with the dust cover? </div></div>

<span style="font-weight: bold">Tsk Tsk... That's one more demerit for Mr. Bushey... [img]<<GRAEMLIN_URL>>/naughty.gif[/img] </span>

<span style="font-weight: bold">I'm almost positive you can not Marlin. I think you will have to go with the small one for the 403 or find a 621 for the larger stuff.</span>

Tommy [img]<<GRAEMLIN_URL>>/[/img]

[YENKO DEUCE REGISTRY]

Anyone have a particular brand that they like/dislike for clutch kits? I'm leaning towards a stock GM/Delco unit unless someone has a better experience with another brand. This car won't have a sticky tire on it, so I don't need some crazy holding power.....

[COPO PETE]

Marlin

We just use the Hays on the LT-1 COPO. Worked great over the years.
Peter

[YENKO DEUCE REGISTRY]

Ok, sounds good. I'm thinking of a whole new idea on this one, I was going Day 1 initially, but now we are going to Day 2 this car so......