I am not sure about the port sizes but the 1500 came with a big valve head,
probably had larger ports to go with the valves.
> From: email@example.com
> Reply-To: firstname.lastname@example.org
> Date: Tue, 30 Nov 2004 00:44:21 +0000
> To: fot@Autox.Team.Net
> Subject: intake port diameters
> One other question regarding 1500 stuff.
> With the larger diameter intake manifold ports...was there a head that had
> larger diameter ports...as from the factory? The LP rules don't allow
> porting/polishing/combustion chamber work...they only allow port matching.
> All the best
> Aaron Johnson
> #38 FP Spitfire Mk4 Southern
> Illinois Region SCCA