We just dropped a 468 Gen 6 in my '68 to replace the 396 that was tired. I had picked up the '68 in April, kinda on a whim. I am getting thank you notes from American Express as a result of the work that has been done on it since then. The 468 has KB pistons of Carrillo (sp) rods, a Comp roller cam/rocker set up, very reworked heads and an AirGap. Followed the lead and put a 850 Demon on it with an electric fuel pump ( Gen6's don't have provisions for a fuel pump ) and during half the time of set up and testing the engine, the Demon shot gas straight up into the air. Kinda pretty but probably not real cool. Kinda reminded me of Belligio ( sp again ) in Vegas cept it did not go with the music. Now, I hear Demons are very good but somehow I did not trust it after that. We pulled the relatively new but not as pretty Holley 750 double off the 396, put it on the 468 and the fountain action stopped. Works great. For my driving the 750 is just fine. Although the engine is very strong, and it's a 4:10 the 4L60 will have its limitations on acceptable street work. Plus Dallas police are kinda unforgiving on stoplight burnouts and I don't have stickies anyway.
The over carb thing happened on my '55 Chevy. Mild cammed 350 4 speed with a Edlebrock 750 and it "bogged" at every shift. Dropped to a 650 Edlebrock and it ran a LOT better. My kid even commented that it seemed that i learned to drive the 4 speed smoothly without the lunges as a result of "power" shifting to avoid the boggs. The out of the box 650 Edlebrock performed just fine. Sure wanted to go with the Demon on the Chevelle but keeping gas in the engine rather than on the engine seemed like a better option. I'm sure that we could have gotten the floats to work right ( we tried several times ) but the trust was gone. A 73 vette with a pretty hot 383 was also being played with in the next bay and when another new Demon ( 750) was put on it, it fountained a couple of times and then settled down. Just some thoughts. Unless I go with Street & Performance injection, I'll stick with the Holley. My tax accountant tells me that my Uncle in Washington wants for money so for now I'll stick with the carb route but injection is screaming at me. Almost traded the Chevelle for a chopped 51 merc sled last week but think I'll wait for another TRI-5. Lost the 55 in a divorce this year. Scott ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, January 13, 2005 8:35 AM Subject: [Chevelle-list] Need new Carb > Hi guys: I currently have a Holley 650 DP which is probably > almost as old as my 65. Lotsa problems, won't adjust, etc. > Engine is a .40 over 327, alum heads, headers, Comp Cams 272 Xtreme, 10.3 compression, M-20 4 speed and a 3.73 12 bolt posi. A fair estimate is about 400HP at the flywheel. The car is mostly show and alway street driven during the season May to November. I do like to take it to the dragstrip a few times or more each summer. What Carb to buy? A new Holley, a Demon, Holley Avenger? The BG people say go with a Mighty Demon 650. I was thinking a 750. The old Holley 650 is chugging like its starving for more gas at higher rpm's. Anyone have experiences pro or con they'd like to share. Any & all info & advice will be greatly appreciated. This is how I learn stuff. There's so much knowledge on this list. I just like to tap into it once in a while. Always saves alot of time & $$ down the road. Thanks Everyone. > -- > Phil G. 65 SS MCC ACES VCCA LGC AMCA > > > >
