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Old 03-07-2006, 09:41 PM
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72 Nova, 65 Rambler, 37 Chevy
 
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Another Inline six thred - chevy 250

Alight, while Im waiting on and Building my 400. I had a thought to hop up my 250 some. Right now its all stock and i cant stand the beehive sound it makes going down the road from all the leaks. so here the plan: add comp cams magnum 280H (230 dur .536 lift "rough idle"), add clifford alum. 4 bbl intake with a 390cfm holley, add an HEI dizzyalong with some headers and open exhuast(I dont want to mess around with a exhuast system for it since 400 will soon be in)

So...

1. Can I mill the stock head with everything still on/in it(valves etc.) to increase compression? How else could I increase compression? Gasket?

2. With the open exhuast, would it be really loud...deafning loud? What would it idle like with that cam? attract cops loud?

3. I heard the manifold flows pretty well, is it really neccisary to get headers?

4. Am I just wasting my time...I mean with this thing be able to do a burnout? lol

BTW using th350 with 2400 or so stall with 3.42 or 3.73 posi rear and the engine has 48000 miles so in good condition

again waste of time? find 292? wiat to build 400? or just throw in a great 350(100000mile good condition good heads...just add cam and intake? that i have? I need more power!

haha so many questions and confused what to do aahhh!

Thanks too all who actually take the time to read all that and reply

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Old 03-07-2006, 10:49 PM
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If yer already in the stages of building the 400 up, Id just use my time n energy and money on getting things ready 4 that.
Youll have(guestimate here) a grand of cash and a ton of hours on something that wont make you really happier than you are now.
Use yer time and do bodywork, order xtra chrome goodies, beefup suspension, ect... HG
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Old 03-10-2006, 01:40 AM
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The stock exhaust manifold won't flow squat. It would be like saddling a 502cid BBC with 2" exhaust pipes. Open exhaust would be loud and obnoxious, and would still flow like crap with the tiny outlet on the stock manifold. Why not set up one side of the exhaust system you intend to use for the 400 and run the six through it? Or, if you're going to use headers (or a dual-outlet manifold) on the six, just do the duals like you're intending for the 400, then connect them to the 250 headers.
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Old 03-10-2006, 07:47 PM
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a 536 lift cam is pretty meaty for a 350, I'd wonder if it would idle at all. use stock cam, a set of headders a,d make the first 4' of the exzaust system easilly interchangable, so you can change out just the first 4' of the system when the 400 goes in. enjoy the car. you wouldn't have good drivability with that cam you want, it's too big for the motor, and questionable on a motor built to take it, for street manors. I think you have 150 HP stock, which isn't bad, figure 10%-20% in headders and you could rejet the carb a little diffrently, and play around with the timing, to get a little more out of it, maby 5% more from that, increase the comp, and get some more out of it, maby 5% there, maby you'll pick up a half of a horse. 250's can get built up good, there is a 600 HP Camero with a 250.
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Old 01-25-2008, 08:13 PM
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Alternatives

Building a strong six is more than just throwing parts on. These engines were designed as an economical workhorse. Clifford says 6=8, this is only true if $100=$400 because you will spend 2 - 4 times as much on high performance parts for a six. I just bought a used Offenhauser intake for $175 which is a decent deal, if you want to wake it up, cheap, the Offy is the best bet. The Cliffords are more high RPM high flow and to really get anything out of them, you need to cam up and port and polish along with larger valves, if you could be lucky enough, you can find a 194 c.i. head casting number 3864883 which has a 60cc chamber where as most all others are 72-74cc's. Stock compression on a 250 is about 7.7:1, not too impressive and a good reason to keep your park brake working good on a stick shift vehicle. A really good alternative to headers is the 292 bus and heavy truck manifold. It's as close to a cast iron header as you can find and it retains manifold heating which is critical to keeping your half dozen buzzin'. Fuel quickly cools and condenses inside the manifold and drops out leaving you with a terrible lag and some cylinders running rich while others starve, I have actually seen a six manifold sweat on the outside like an AC line. The 292 manifolds are hard to come by but after beating the bushes, trees, lakes, ponds, golf course greens, etc. I found a supplier of new ones. These same manifolds were also used on farm equipment, here's a link http://www.the-co.com/StoreFront/pro...0f17e066f9d0d6
This manifold has a 2 1/2" opening so you can hang half the exhaust for your 400. Using this manifold with an Offy does require a little clearance cutting on the bottom of the intake and an 1/8 spacer on the exhaust riser as the 292 stock intake has a taller plenum. I modified my intake to accept a large bore Rochester 2 bbl. cut my high comp head for 1.84 intake valves (4 bbl 305 stock size) and kept the 1.5 exhaust valve, spent a good bit of time porting and polishing and used a set of 100lb springs and cut .030 off. By my best math calcs, I am in the 9:1 category on compression. I needed the torque more than the HP, I use a '67 Chevy van shortie to pull my car trailer when I need to move my '55 around. It's 100% reliable and pulls like a mule. I would also recommend ARP rod and main bolts if you are really going to torture it, which, by the way, cost more than the V-8 fasteners eventhough there are less of them. Have fun.
P.S. Here's Leo's website, how about a 292 with one turbo pushing 1000 (yeah, three zeros) horsepower.
http://www.customdesignperformance.com/leo/leo.html

Last edited by Sixgun; 01-25-2008 at 08:19 PM. Reason: add information
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Old 01-25-2008, 08:49 PM
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six.

1975 or so I had a 74 Nova 6cyl 3 speed I bought new thinking it would get good gas milage; not so. I decided to be different and build the 250 six. I started with the 3864883 194 6 cylinder head milled .060. Used a cam/kit I bought from J.C. Whitney; 501 lift is all I remember about the cam specs, don't remember the duration, but once it was all together it idled as smooth as a coffee can full of rocks being shook up. Had a Clifford intake and 2 barrel Holley, Clifford headers, a Mallory dual point with a Judson magnito coil. I used a stock dual exhaust from G.M. on the car; the biggest problem was running one of the collector dumps under the trans and over to the passenger side of the car; made the Nova sound like a sports car. Swapped in a 3 ring Sagiaw 4-speed, but left the stock 3.08 gears in the rear, the rear gear needed to be lower, but once rolling the car was very impressive. I had to Locktite the flywheel bolts in and torque them to 100 ft. lbs. as it had a tendency to shake the flywheel loose. I even put LT-1 decals above the front side marker lights. It would beat a lot of V-8's and you should've seen the look on guys faces when I popped the hood and they saw they just got beat by a 250 cid 6 cylinder. It was fun, but a lot of work with the exhaust making it a pain to pull the trans to replace the clutch. Eventually wound up putting a 327/350 turbo combo in the car to tow my 56' Bracket Car. I say build the 6 and have fun with; save the 400 for a P.U. truck. I even thought about what a turbo would do with the six; I remember an old Hot Rod Magazine where they built a 250 with a turbo that was in a 66 Olds Cutlass.
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Old 01-25-2008, 09:45 PM
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turbo lag......yeeeeehaaaaaaw
 
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I was thinking of building the six in my nova but decided to go v8 instead. Its been a while but I think you can use the 307 flat tops and a stock head to get 10:1 cr. I had straight pipe on my car for a year and it didn't get to obnoxious but I was also 16 so everything loud was cool. I'm currently looking for another nova with a 6 just to see what I can do with it.
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