i might make my own intake..i really like to get into making my own parts.........anywho.....and i have 2 1975 455 carbs to play with, how would i go about linking them together? in a safe manner, lol are the 75 carbs 850cfm?
Once I saw a dual quad SPREAD BORE intake on ebay that would fit 2 q-jets onto a Nailhead. :Brow: Couldn't you just take an Eldebrock or something that's already a DQ manifold and just modify it? o No:
Why make your own if you can buy one already set-up? What engine is this going onto? If you're building a small block; or pre-401 nailhead you're back to building your own. IF this was me, It'd get a progressive throttle linkage so it idled on the front carb until the rear carb was ~1/3 open. Good luck getting the throttle blades shut far enough to keep the idle speed down. I suspect this is do-able, but probably not much fun. There's two listed in the Offenhauser catalog; 5618 (low rise) and 5743 (high rise) fits 401/425; and one for "big blocks", 5885 fits 400/430/455.
Buick did make a 2x4 cast iron intake for the 455 with a Chevy Qjet(rear) and Buick in the front. I saw it in the early 80's in BG.The Chevy was used for the gasline going to the side and the buick one in front because there wasn't a fuel line issue.I don't know what happened to the intake. I am using an Offy 2x4 with 660 Holleys(redone by quickfuel), ran inline and there were no problems on AM&P's dyno.We got over 650HP on a 10.4:1 stage2 engine.You can check it out on their website. Mike Nussell
Buick did make a 2x4 cast iron intake.I have one it is on a prototype/expierimental motor 430.The motor has x along with the 7 digit GM #s on all parts of the motor.Where the vin.# should be it has 65 x 430 -17. The 65 is the year block was made(2-years before its time of production)X-for expierimental 430 motor size and 17 production #
i wanted to try and make an aluminum sheet metal intake, since i like challenging projects, and im getting a new ac/dc tig welder:grin: .....might work on some headers too It's going on a 75 455....i just have to track down the spare engine and take it out.........its got alot more miles on it then the one im using, the guy i knew that had the other one let the fire department(volenteers fking around) practice on the car......just gottta ask him where it is now.....its a small town, couldnt go far
the one with more miles has a fresh rebuilt carb on it, thats what made me think i should use it for somthing cool
New to v-8 site have not learned how to post pictures yet but if you e-mail me I do have some pctures of factory 2x4 prototype motor. Also have #-24 moter also expierimental motor but has a very strange single 4 barrel intake I will send pictures to you e-mail me Mike L.
OK, I have received photos from Flint 67 GS. I'm posting his comments to me as well as the photos of the engine he sent. What follows is from Flint 67 GS, edited for clarity: Schurkey: Here are some pictures of motor--Some of the things I noticed: Stage 1-Fuel Pump, true Champion spark plugs. The exhaust manifold in the middle where it looks like dumps down is actually blocked off. Original white A.C. oil filter. The valve covers have only 3- lines across (455 has 4-across) (430 and 400 have lines going down) The paint under the red is green--I think the motor was being developed in 1965 and that was color of nailheads. I opened the oil pan--IT IS LIKE it was built yesterday (as far as clean). All the parts have X along with G.M. 7 digit #s inside and out. Pistons, crank, connecting rods, heads, block, timing cover etc. The carb linkage seems very basic and primitive but I guess they were just experimenting. I think motor would fire right up but I have not tried. Where the vin # should be it reads 65 X 430-17 65 being year of the block (2-years before its time) X-for experimental motor. 430 for size of the motor. 17 for production #. Second motor has similar #s - 65 X 430- 24 This motor was # 24 block
Mike sent me those as well, amazing...prototype valve covers, exhaust manifold, intake, etc. Speaking of exhaust manifolds, looks like a lot of R&D took place between those prototype logs and the '67 model year! Devon
Now that 430 I would have kept :Brow: .......but what's up with that dinky power steering pump pulley? uzzled:
Learned from Buick engineer who worked on prototype/expierimental motors and came over and checked out these motor's that crank size on these motor's were only 3-inc hes.And 2-weeks before full production G.M. changed them to3 and 1/4 . we measured and they were only 3 inches
And it looks like these are now for sale: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=140190842092 Devon
Denny had said that the engines started breaking cranks on the dynos during testing. They had to increase the journal diameter becasue of it. I remember him saying it started happening very close to production.
