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The headers lose most of the tuning and scavenging benefits operating
thru the mufflers have is my observation.
Bach in the early 60's when I was a poor kid (still miss those days), I
would install cut out a foot or so below the manifolds on my Mopar
and pick up a tenth or sometimes more at the...
I have a near new set of 10 x 15 5 1/2 BS Polished Welds (Only 10 runs)
that I would be willing to trade but the freight both ways
would be a bunch for you.
You can make horsepower thru the exhaust manifolds.
However, all the FAST Mopar that I am aware of have significant work
on them including extrude honing plus portingand cost more to do than an average
set of 2 Inch headers.
When I tried the HP manifolds on my 10 Second 440 Valiant, I lost 3...
As I recall, back when I ran my Factory 68 Hemi Dart,
The jetting that came in the factory 770 Holleys
was pretty close at Sea Level and a good start.
Is it a dedicated race car or a street car that runs thru mufflers
and real Air Cleaners?
Nope, lifter weight to me is not all that critical
compared to the rest of the valve train in my opinion.
If I break a lifter, then the engine goes to hell in a Hand Basket!
Quickly.
Just my .02 = For Free
(And probably what it is worth)
Thought they might be Ford 875 looking at them.
You will need a Long pushrod and depending upon the
head and if A or B engines = It may take some modifications
on the pushrod holes. to clear the long pushrods travel in the head.
I see no reason for the way these are constructed.
This is quite a small camshaft.
I would rather run an older factory camshaft that
was better metallurgy if it still looked good or find a
NOS early Mopar Performance camshaft kit on the forums.
The new Chinese cams are questionable at best.
I sold over a dozen old NOS of the Mopar Perf...
Most adjusters have a recessed area in the middle for oil to flow to rockers. If
not lined up the oiling will be very restricted.
Mopar recommended .250 to .280 measurement with the adjusters that have
a ball on the end as I recall in the old racing manuals.
Most of the newer adjusters...
We have been using Motorhome and then Toterhomes for 20
years now. It is more comfortable at the track.
Only time we use the Dually is when it is a single day race which
is almost never at LVMS.