[John Brown]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Ryan1969Chevelle</div><div class="ubbcode-body">There is a bit of info in the Assembly Manual.

FIG 3: Here I can see the heat riser built in to the Drivers side EX manifold in the first picture on page 120.

FIG 4: Also the block off plate is shown for the Passenger side EX manifold to block the cross over port.

I can't think of a survivor 69 W31 to look at that has original exhaust....... Anybody?

As far as I can tell the exhaust has no W31 specifics, so a Cutlass with an L74 High Compression 350/310HP would have the same N10 Dual Exhaust as a Cutlass with a W31 350/325HP?

Ryan</div></div>

Get in touch with Casey Marks over on V8buick in the Pure Stock section. His uncle raced NHRA stock class with W31's from new and Casey raced one at the Stanton PSMCDR for years. If anyone can answer your questions, he would be the one.