SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Beaveretriever on March 20, 2009, 05:56:54 PM
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i have a chance to buy a brand new demon 750 dp with mech secondaries. i had a holley 750 dp on my old boat and it ran great and it was 455 and its now on a 454 and runs good. does anyone have any experiance with the demons? i called around about jets and metering blocks and i was told that the demons use the same jets as a holley and same with the acc pumps.
Thanks
The Beav
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IMO the Demon carb is just like a Holley that has been worked over extensively from the factory. All the stuff Holley wants to sell you extra to hot rod your new carb is already in the Barry Grant carbs, from what I understand. All Holley parts interchange, with the possible exception of baseplates and bodies, again, from what I understand. Someone will chime in with more experience than I though.
On my engine, I know it's trying to turn itself inside out from the 750 that's on it at about 4500 rpm. That will be fixed with a second 750 on a tunnel though. I was told by the guy who bench run and broke in the cam on my engine that I needed to use a 950, MINUMUM, and he recommended a 1050 Dominator. (He also claims all 460's should use an 850DP, if performance parts are used like cam, intake, etc.) But I have extensively ported heads, 11:1 compression and a rather radical solid lifter cam too.
I just don't know that 750 is enough for OPTIMUM performance. Mine runs out just fine with the 750. Just could be better, and I want that BETTER part. So if you're after a 4500 - 5000 rpm cruiser, more than ok on the 750 I would think.
Ray
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I put the same carb you have on my 460 in my truck. I previously had a holley and it sucked. bolted the demon on and it made a huge difference. Holley stuff directly swaps over to demons. Jets and all.
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Here's my mighty Demon rework to flow 1050 cfm. Have not got a chance to us it to see how it works :banghead:
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im runningan 850 demon on 460 its the way to gooooooooooo
was runnin a 750 demon an that worked real good also
right out of the box and go
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There was a guy on craigslist selling 1050 dominators for 800...pretty nice they were off mercruiser motors....I shoulda got one but no use for it....I run an 800 double pumper on my 429 ford...seems to be plenty mentioning the motor is fairly stock...