62Jeff

Joe,
Now I know why you were asking about the oil filler cap decal. I think you ought to put it on the car, even though it isn't "correct" for a "270" motor. It will give the type A people something to pick at, while they fail to notice the Dart heads, the loud rumble, etc.

Jeff

devildog

Thanks Jeff,

You got the idea, I think I might after further reflection. Two of my strongest (****) NCRS buddies want me to put the wash/oil sticker on the cap even though it is not correct for a solid lifter 270. They are more into deception than purity of NCRS.

Joe

narlee

Did you use stock valve covers also?

vetrod62

Tom, You the man. I agree. I have had my "Dart Little M" since 2004 and love it. 395 ci, 4.25 bore x 3.48 stroke. It winds like an over sized 301/302 and makes big power.

Joe, you will like the engine. But my question is how did you get the manifold to cover the large ports on the heads?? I ran a Man-O-Fre 4x2 back in the day. I tried to put a 4x2 manifold on my Brodix heads and the head ports were larger than manifold exterior dimensions. My only option was to build up alum. weld and port the manifold to fit the heads. It does not matter to me any more because the guys I race with have stepped up their game and now and I can not give up the 50/60 HP and win.

Did you paint the heads orange??

devildog

yes, the DART PRO 1 heads have a deeper trough around the edge, so the script valve cover sit nicely over taller valves and rocker. I had intended to use spacers, but no need.

Joe

devildog

Jim, yes I welded about 3/8 inch on the porting flanges to make a good seal. Again, I just use my wood rasp to shape and finish-off the weld...It looks 100 % like part of original cast.

I painted the DART heads and even rounded off the edges and put a 'diamond' on them. That was hard to take the die grinder to those beautiful DART heads. It wont fool a knowledgeable person but will be fun.

Joe

wesmigletz

Joe, congratulations on the results... this build has been a long time coming. I like your undercover way of doing things... I seem to recall the "right hand dipstick 283" you were running when we first met. I look forward to hearing about your trip and how you do on the track... just be careful the back end doesn't come around on you.

BTW, if your Team G intake is a #7530, it will fit under the stock hood with a black, GM drop base air cleaner. We run a #7530 on our 62 with the stock hood.

Too bad you won't be stopping by CFCI. Mei is flying in next Thursday, and would have liked to see you. I have a 96 hour pass for Memorial Day, and will be driving down from Ft Knox. We will be at CFCI Thursday night, and Friday during the day.

Good luck on your trip.

NOM61

Joe,
How are dealing with crankcase ventilation with the old school valve covers and no spacer plate? Header tube?

DT

vetrod62

As we used to say, "Far out dude". Wood rasp, Funny thing, they guy I have been racing for 40+ years and I were talking about that word last weekend saying no one under 30 would know what that meant. Now, power planer, yes.

You now, sound like you could compete in our NJO C1 race series.

vetrod62

I tried everything to make a PCV work. No way at 7500 rpm. I went back to my old Edelbrock covers from tunnel ram engine in the 60s with the huge breathers. Just pupping down the street at low rpm it worked fine. But several passes down the track it would push a little oil out the filler tube. Works for me.

Stewart Allison

Strong numbers what comp, piston, fuel, spark I'm not sure you mentioned it..... The heads CNC ported from Dart ? Was that a solid roller or just solid. What type of lifters ? Sorry for the askings... Stewy

Stewart Allison

NSRS. Is the preserving of an original classic Corvette. There is nothing wrong with a hotty and there is nothing wrong with an original. I just don't like to see a very good original turned into a hotty.... If it needs heaps of work then stuff a big cube and big wheels. I love both and respect the hours of labour in both.... My 2 cents worth... Stewy

mechron

hi stewart. there is no way WCFBs can make 500.HP, they came in the early vettes. the AFBs came later, no way could they make 500 HP. . But the holley carbs (either the vac soncandaries or the doumple pumpers. 600, 750,780,800 or 850 carbs) could make 500 HP with the right engine build...

devildog

Merchon, almost 500hp is 494 close? It was hot and high humidity in Houston on Monday. If we had tweeked a bit we my have made 500 on my old WCFB's



Two WCFB's will flow 700+ total.

Joe

devildog

I was trying to achieve BOTH...double the power and keep it looking original to the typical Corvette owner.

Donny Brass

Just because you did it, doesn't mean it can be done

427Hotrod

Beg to differ. The WCFB's flow plenty of air to feed 500HP and did. The intake is the issue. We worked it pretty well...but it's still tiny.

Even the BSFC looked pretty good considering what they are.

Compression is 10.8. Fuel was 93 octane Chevron-no additives. We tried various timing settings and it was happiest with 36-37* total.

The heads are as cast, not CNC.

Originally we thought we would have to run valve cover spacers with an added PCV tapped into them. But the raised valve cover rails on the Dart heads allow the stock covers to clear the roller rockers.

Joe did some creative engineering and created a oil separator tube for each head. We drilled and tapped the rear of the heads and installed the tube. It will be nearly invisible unless you look hard.

This motor is tight and we used the one breather on the intake fill tube. We pulled it to 6600+ RPM quite a few times and it was clean and dry.

The cam is a solid roller that I custom spec'd for this setup. Spent LOTS of time with Comp's head cam designer (not Tech line) working out all the variations and issues with a decent flowing set of carbs, a restrictive intake, good heads and restrictive exhaust. That's a heck of a combination to deal with and lots of compromises have to be made to make it work the best you can. You really have to analyze what is truly going on in the cylinder and when it's happening. We studied many lobe profiles to get some that would fit the bill.

We'll detail it all in Corvette Enthusiast articles.


JIM

427Hotrod

If you'll notice....the WCFB's aren't falling off even at 6300 RPM!

In fact...it was a little fat and we could have made more power if we spent the time to lean out the carbs a little. But we were happy there!

JIM

devildog

Dont be sorry for asking. I just have to save some stuff for the Corvette Enthusiast magazine article. 10.8, pump gas, 37*, solid roller, heads out of the box. COMP lifters.

Joe

devildog

Since the DART heads are taller, no need for spacer, I just tapped into the back of the head and used 'a bubble cap' oil/air separator (will show in magazine article) for a PVC system to the back of the front WCFB as per RPO 242 on 1961 California 270hp/283 cars