Thanks to everyone for the information. I think we know what we're going
after. Hopefully we can make some horsepower with this formula.
No combustion chamber work
only port matching no further than 1" into the head and intake manifold
.450" max valve lift at .000, no duration limit.
Stock rocker arms
11:1 max compression
valve seat angles are up for debate still
--
All the best
Aaron Johnson
#38 FP Spitfire Mk4 Southern Illinois Region SCCA
http://www.geocities.com/spitracer9
> If I remember correctly, the larger runner manifolds came on the 1970 MkIII,
> 1971-72 MkIV and 1500's up to 1974. BL choked down the later 1500's for
> emissions purposes. I don't believe the head port diameters changed at all.
> It will definitely make the engine breath better.
>
> Rob
>
> -----Original Message-----
> From: owner-fot@Autox.Team.Net [mailto:owner-fot@Autox.Team.Net] On Behalf
> Of fpspitfire@insightbb.com
> Sent: Monday, November 29, 2004 7:42 PM
> To: fot@Autox.Team.Net
> Subject: large runner 1500 (single ZS) manifold needed
>
>
> All,
>
> During the off season I'm converting the car from F-Production to the new
> limited prep formula in H-Production. Part of this conversion is changing
> from the 1296 to the 1500...to go along with that I am required to use the
> original single carb manifold. It's my understanding that there were two
> runner sizes, a 1" runner and a 1.25 (or 1.125"). I have a 1" manifold at
> the
> engine builders...I'd like to get one of the larger diameter to see what the
>
> difference will be. Anybody have one gathering dust they'd like to part
> with
> for cheap?
>
> aaron
>
>
>
> --
> All the best
> Aaron Johnson
> #38 FP Spitfire Mk4 Southern Illinois Region SCCA
> http://www.geocities.com/spitracer9
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