Subject: RE: What heads to use!
Author: Charlie Mullendore
Date: Jan 28, 2005, 3:41 PM
Post ID: 1718294376
Hi Ted,
As Paul said, both valves are larger on the later heads. There is a
raised area around the valve guide that is part of the casting - this
would have to be machined down to match the later heads if you wanted to
use dual springs. Instead of doing this though, I'd either just use the
heads as they are with single springs and small valves (IMHO, the early
Ambos with these heads run plenty strong) or find a pair of later heads.
One other thing that is different is the way they are secured to the
cylinder studs. Instead of a nut with an "allen" head under the hex plug
at the 12 o'clock position on the later heads, there is a bolt/nut
thingy (hex head, approx. 3" long, o-ring groove) on the V700/early Ambo
heads. You'll need these if you're going to use the early heads.
I can post some pics of the two heads side by side for comparison if
you'd like. Cheers,
Paul P. Linn wrote:
| Ted, As Charlie said, the valves on later models like the 850 are bigger, they will not fit the V700 heads. Some of the early 750's used the same heads and valves as the V700. Rather than machine a good set of V700 heads, look around for some later model ones. Plenty up on eBay all the time. |
| From: edward Walton |
| Charlie Fifteen years ago I changed the heads on my Ambassador, Header pipes were moving arround Threads were toast! Put on new heads and kept the valves.These old valves fitted into the V700 heads! Is that right? Will 850 eldo & 850 t valves fit or are they bigger? For sure the twin springs will not fit over the vavle guides. Guides have to be changed so should I machine the heads to fit the dual springs or just leave the singles? Thanks for the help Guy`s Ted From: Charlie Mullendore |
| Hi Ted, I wouldn't think there would be a problem with the single valve springs unless it was with float at high RPMs. The V700/early Ambo heads also have smaller valve diameters so you'll not get the horsepower of the later heads. They use a different guide as well, but the later style will work without the locating circlip or ridge. One plus that I've noticed though is that the V700 heads don't seem to crack between the (intake or exhaust? - can't remember right now) valve and sparkplug hole like most of the later heads do. If you use them I'd recommend using the reducer inserts sandwiched between two gaskets for proper port velocity and heat isolation. |
Edward Walton wrote:
|
Charlie
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