The 151 is worthy I think?

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Postby NixVegaGT » Tue Jan 09, 2007 11:18 am

IronDukeVega... What's your real name btw... Good story. It's crazy that you had to shave the head that far to get 9.75! WOW. I'm in the process of building a rare motor (for US anyway) and I have done a bunch of developement. I have combined parts from a number of different manufacturers. (Chevy rods, Ford pistons, Buick pins, Rover block, Iron Duke intake valves, VW 1600 flat-4 exhaust valves, maybe Volvo B16 adjustable rockers...) It was cool to read about your modifications. What do you think about that Chevy SB head idea?

I also wanted to say after reading this thread a few weeks back I went out to find speed parts because I figured there would be a crap load... (It's the obsessive part of the hobby for me. I'm likely never going to use an Iron Duke but I love the research.) You're right there is practically nothing! It seems like a great platform, and it was used for a long time. Not the cross-flow but the 2.5 derivitive. You know what I'm saying? Weird.

Tom , you are a determined little 151 bugger , aren't you! Doug in Az 8

Awesome, Doug! LOL.
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Postby NixVegaGT » Tue Jan 09, 2007 7:49 pm

OK so I'm never going to build this engine but I can't stop myself. I don't think it's healthy but I'm a bit obsessive about engine building. Especially when it comes to engines that are rare or over looked... ANYWAY:

I searched around for pix of head gaskets... Here's what I found:
Image
Image

I don't know guys! They look pretty similar! I'm temped to buy a couple crappy head gaskets to see if they match up. I'll give my machine shop a call tomorrow to see if they have any sitting around their shop... COOOL!

I just realized my post doesn't make much sense... This is a SBC head gasket and the Iron Duke head gasket. I think it was Doug that mentioned seeing a Duke with a SBC head on it. That's what I was talking about.
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Postby NixVegaGT » Wed Jan 10, 2007 5:00 pm

I talked to my machine shop today. They were saying they used to build a crap load of them for industrial applications. They built a few of them for racing too and had heard of putting the SBC head on the Iron Duke block. He said he remembered building a couple of them that way. COOL!
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Postby HI WINDING MONZA » Wed Jan 10, 2007 10:18 pm

All I can say is my " duke" is out of its home and "puked" on the ground now! :D :D :D :D :D :D :D ( parts will be for sale soon in " package deals" ) Doug in Az 8)
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Postby Vega75randy » Fri Apr 20, 2007 8:14 pm

May I interject here? This picture was shown on another page. This head may have been discontinued by GM as a Pontiac replacement item but, has become the standard for the GM 181cid marine engine. If you want a all out race engine have the SBC head mated up. If you want street able horse power then use a marine head and 1.94/1.60 valves and Mega Squirt EFI and a turbo. Just my .02 worth.
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Postby HI WINDING MONZA » Sat Apr 21, 2007 10:52 am

Just a note, that is a " non crossflow " head that will work on the 68 - 70 Nova 153 and the H Body 77- 78 151. Doug in Az 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
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Postby rgsuperstrat » Sat Apr 21, 2007 3:33 pm

Wow. I have been working so much that I just got back on the forum, and realized that I started quite the conversation. All of you have been very informative about this build, and I than k you for that. I do though, want more info on a SBC head conversion. Like the types of SBC heads that will work, and exhaust and intake options. Before reading all of this, I was just going to go with the four barrel from clifford or offy, a bigger cam, and maybe deck the head. Now however, the SBC head really would be cool. If anybody has done this, details would be awesome!! Thank you again everybody for not just responding with "drop in a 350"!!
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Postby HI WINDING MONZA » Sun Apr 22, 2007 12:19 am

You have to buy the block from that Kansas place which is real expensive , since they wont do your block anymore like they did in the 90's. Unless you can find a machine shop that will" try "it for you..................................... :roll: .................Any SBC head will work but you will have to have an intake made up. Doug in Az 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 109k miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 149k miles
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Postby spencerforhire » Sun Apr 22, 2007 6:44 pm

Wanna know just how much power you can make with an "iron duke" 151? How about the NHRA L/A record holding Opel of Allyn Armstrong that goes 8.90 at 149. No turbo, no blower, no nitrous
9000+ rpm- I've seen this thing run and does it sound wild!
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Postby Vega75randy » Mon Apr 23, 2007 6:50 pm

How about adding 30 more cubes to have fun with. Good 181cid blocks can be found on eBay almost daily. Even without being cross flow these engines will add some much needed HP into an H-Body engine bay. With a turbo, well that would be interesting. 8)

(going to have to investigate that one :P )

Almost forgot to add: Custom Design Perforance can do the block work for the SBC head. They have done the same kind of thing to a 292 cid straight 6 but used two SBC heads with one cylinder cut from each head and welded into a 6 cylinder head.
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Postby res0o7eb » Thu May 24, 2007 9:16 am

Got my cam from Schneider that I ordered back in October. Uh... that's 7 months ago. Cost was $183.00 shipped.
Glad I didn't try to rebuild the motor, yet. I think I will definitely wait until I accumulate ALL of the parts first.
Here's the specs as promised (in red) with a few other cam specs from their web site.
The tech guy told me that the cam isn't listed, but it's between the 16202 and 16203, so that's where I put it in the list - Lift@.050(I,E) is 0.280 0.280. This with a 1.7:1 Rocker Ratio. They recommend dual springs - P/N: 6500(outer) and 6600(inner).

    __P/N:__Grind____Dur(I,E)____Dur@.050(I,E)_____Lift(I,E)______LSA____Int(Opens,Closes)____Exh(Closes, Opens)
    16202: 262-82H...262...282.....208.......220.....0.464...0.490....110
    44660: 270-80H...270...280.....214.......218.....0.480...0.480....110......27BTDC...63ABDC......28ATDC...72BBDC
    16203: 135H.......270...270.....218.......218.....0.460...0.460....110
    16204: 280-90H...280...290.....220.......230.....0.540...0.540....110

What do you think? Is this a good cam for the street? Or is it too much? I can't remember the RPM range for this particular cam and Schneider doesn't list that data on their web site. Hopefully, the idle isn't too rough. heh-heh.

A similar cam from Comp Cams(P/N 14-123-4) "Good combination of torque and power. Performance street and Marine." Another cam with less duration(P/N 14-119-4) "Good torque and power with smooth idle. Strong increase over stock cam."

Higher compression and some head work is probably needed - nothing radical, though. I'm looking for performance, not economy, but I do want decent driveability on high octane pump gas.
Last edited by res0o7eb on Sun Jun 15, 2008 5:39 pm, edited 9 times in total.
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Postby HI WINDING MONZA » Sat May 26, 2007 12:23 am

Tom, it, should work for you, I had the a simular one like the one on the bottom of the list it had no torque what so ever and on the street it lugged the motor. ( even with 3.42 gears and a 3.50 first gear ) Torque and HP peaks were the same at 5600 rpm. Doug in Az 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 109k miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 149k miles
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Postby rickswagon » Sun May 27, 2007 4:02 pm

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151

Postby pobrien327 » Mon Jul 02, 2007 2:04 am

3 yrs ago, I drove a 79 Monza wagon 151, 4 spd from California to MN, so it earned a spot in my heart.

But for the rest of our lives, we'll be driving 4s and 6s. If the car is a hobby car or driven very little... the fun of a V8 in a small vehicle is a real treat. I'm in my 50s and had V8 daily drivers from 1971 to about 1993. Its over, unless it is a fat truck or suv- which have lots less go.

Do what you want- yes 4s can be a lot of fun... but a V8 is a dying thing - so I'd go for one!

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Postby res0o7eb » Mon Sep 17, 2007 7:30 pm

Not much activity on this thread, so I thought I would throw this in:
Image
What is it?
There is an Iron Duke in that engine compartment.
This is from a 1984 Firebird. There were more than a few of these 4-cylinder birds (and Camaros).
All but a few have been replaced with a V-8, I'm sure.

I remember seeing a third-gen Firebird at a car show in the early 80's with what must have been a Super Duty L4 with dual webers on it - the works. I didn't know what it was at the time.
I remember the sign next to it said something like, "xxx horsepower and only four cylinders!" or something like that.
I just thought the new 82 Firebirds were awesome-looking when they first came out - nothing like it on the road at the time.
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