Reply With QuoteI agree Chris. I have been pretty inpressed with my Demon 750. It's a great carb. Not to mention they come with a nice instructional video for idiots like me.
Summit has the Mighty Demon annular for 499. Not a bad price IMO.
Gman,
I ran a 850 mighty demon on the 496 right before I decided I wanted more out of the motor. The same carb will be doing duty on the new setup as well. I was really impressed with the throttle response the carb gave with minimal setup over the out of the box condition. The carb comes with replaceable boosters, screw in air bleeds, and is just plain better looking than a holley. All of that and they're less expensive than an HP950; I think I paid right around 5 for mine.
Good Luck,
Chris
I agree Chris. I have been pretty inpressed with my Demon 750. It's a great carb. Not to mention they come with a nice instructional video for idiots like me.
Summit has the Mighty Demon annular for 499. Not a bad price IMO.
just thought i would throw my .02 in there . i have to 750 on top my 501 ford and if i have to do it again i would go with the single plane manifold. with the single larger carb. fords love cfm . oh and here is a pic of my heads
http://plumbersassracing.com/images/engine/port2.gif
http://plumbersassracing.com/images/engine/rocker3.gif;)
Clean lookin' build, hack job. Here's a similar picture of mine:
http://www.***boat.com/image_center/...nstall-med.jpg
Beached, the stock intake valve size in your D0VE heads is 2.08". In relation to the intake port cross-section of that head and the flow characterstics you want, the head works best with a 2.19" intake. (The seats you saw on my heads are cut for 2.25". They were re-cut to 2.19".) Next time you have your heads off and are going to get port work done, go with the 2.19 intake and port accordingly. If you port only one side of your head (either intake or exhaust), absolutely port the exhaust first; that's where your major restriction is.
Depending on your approach to exhaust porting of the 429/460 BBF (and the application of the engine), complete elimination of the thermactor boss can hurt flow/provide lesser results than shaping the thermactor into a vane with "trenches" on either side of the vane. Technically speaking, completely grinding away the thermactor boss is probably better than leaving it untouched. If you have any thermactor boss material left over for refining into somwhat of a vane, then leave it in place for that future modification.
LO
Originally posted by LakesOnly
. If you have any thermactor boss material left over for refining into somwhat of a vane, then leave it in place for that future modification.
LO
I believe I left enough material near the valve stem area for just that. My intention was to help it as much as possible without screwing myself out of a future port job by a pro.
Thanks for the info.
Originally posted by beached 1
I believe I left enough material near the valve stem area for just that. My intention was to help it as much as possible without screwing myself out of a future port job by a pro.
Thanks for the info.
Ditto on what lakes sez bout the intake valve, I would leave the stock sized exhaust valve in there.
Originally posted by Craig
Annular boosters help when you use a big carb on a smaller motor. They increase signal stregth and fuel atomization, enabling a smaller jet size and the ability to run a larger cfm carb on a smaller displacement engine, giving the low-end feel of a 600 cfm carb with the top end flow of an 850.
Craig
This pretty much sums it up. The 850 Demon should work fine for your application, going with an annular will definitely keep it throttle response happy and with keeping a strong mid-range for that BBF.
~Ty
Thanks for the reply Hotcrusader, would a Demon 850 annular be your first choice for this application? If not, what would you suggest?
Thanks,
If it was my boat and motor I would run an HP950 Holley carburetor. It will need some prepp for your engine in order to perform well, IE 50cc secondary pump.
The 850 Demon is a good choice but it will also need some prep/tuning. Probably more so than the HP Holley. Barry Grant customer service sucks, and trying to remedie an issue with them might take days over e-mail. I'm not trying to scare you off the Demon choice, but be forewarned there's been alot of complaints about their use on many of applications.
Either way if you have a tuning/carb issue give me a call. I can assist you on dialing it in whether it's one of mine or BG's. I always extend my help to ***boat members alike. It's my way of drinking for free
~Ty
Hotcrusader,
If I can get a better setup through another ***boat member, then hell yeah! Thanks!
please check your PM's.
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