Reply to "ENGINE REBUILD"

The Offy intake you are describing is the Dual Port. The dual port design
has the runners split into top and bottom sections, with the plenum split
fore-and-aft (rather than the usual side-to-side). It's essentially two
single plane intakes, stacked on top of each other. The primaries feed
the longer path lower runners and the secondaries feed the shorter path
upper runners. When cruising, the manifold operates on the smaller area,
longer path, runners. This provides high velocity flow for good fuel
economy and throttle response. Under high demand, the secondaries open
and provide additional flow through the larger top runner portion. It's
an interesting approach but the packaging required to fit within a carb
intake envelope does compromise the design somewhat. By reputation, it's
a good fuel economy, low end response intake but it is not a high power
or high RPM design. It is a terrible match with your .614"/.631" solid
lifter cam. That sort of cam requires a Holley Strip Dominator single
plane or at least a Blue Thunder high rise dual plane.

>Would you run a torker intake or weiand xcelerator intake?

I don't care for either of those intakes on the 4V heads, though I do
like the 2V Weiand Xcelerator for 2V heads. The Holley Strip Dominator
is the best intake for the sort of cam you're running.

>should i replace the 6213 with a 4780 800 double pumper or try a
>4781 850 double pumper

You might look at the tuner type carbs which flow more CFM for a
given bore size. Holley has the HP Series based on 750 carbs that
flow closer to 830 CFM. Demon makes similar carbs and their are
a number of tuners that do similar things to standard Holleys.

With a single plane intake, you'll want a carb with annular booster
venturis as they work better with low vacuum signals.

If you want to be differnt, the Predator variable venturi carb (make
sure you get the street version with idle circuit) works very well.
A friend runs one on a 377 cube stroke Cleveland and the Predator
mounted on a Holley Strip Dominator was better across the RPM band
(even down low) than a spreadbore Holley on a heavily ported Offy
Dual Port intake. The only problem is the Predator is a very tall
carb.

>Have been looking for a strip dominator intake but so far no luck.

Keep looking. They pop up on Ebay from time to time. Holley was
supposed to reintroduce it and have the tooling but Holley is in
serious financial trouble so the future is unclear.

Dan Jones