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Alan Roehrich · 07-21-2011, 03:25 PM

1263403 appears to be a casting number for the 1263406 and 1263407 intake manifolds. Those are oval port manifolds, so no, they are not the same as a 19131359.

07-21-2011, 03:25 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,066 Likes: 1,487 Liked 1,630 Times in 378 Posts	Re: GM BBC Intake ? 1263403 appears to be a casting number for the 1263406 and 1263407 intake manifolds. Those are oval port manifolds, so no, they are not the same as a 19131359. __________________ Alan Roehrich 212A G/S