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#26 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Ambulance engine
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#27 |
Senior Member
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Location: MISSOURI
Posts: 3,256
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Re: Ambulance engine
[QUOTE=El Jay;2635192]I hate to sound stupid, but aren't all 350's 4 bolt?[/QUOTE
R U serious. Betting U R. lol
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The biggest problem people have, is other people Thou shalt be cool and not hassle ![]() Be a site supporter. ![]() The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2 |
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#28 |
Registered User
Join Date: Apr 2005
Location: Dunlap, IL
Posts: 308
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Re: Ambulance engine
I know of one, This one only has the the ultra rare police interceptor/cobra jet/super hemi commando 350 CI motor however....
![]() The original 427/435 HP motor was removed because it was so fast the ambulance would arrive before the accident took place ! This is the only 4x4 suburban ambulance I have ever seen. It was built by my buddy Bob out of a ultra low mileage (19K miles) 69 Suburban ambulance and a 71 4x4 chassis
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68 GMC 64 1/2 Mustang convert A bachelor's life is no life for a single man." - Samuel Goldwyn |
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#29 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Ambulance engine
Quote:
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#30 | |
Gone to greener pastures
![]() Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
Quote:
I've never messed with a car 350. Trucks only. Never opened one up that wasn't a 4 bolt. You now know why I LUV this site. Lotsa info, & no "Man, are you dumb!"
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#31 | |
Registered User
Join Date: May 2007
Location: Moore, Oklahoma
Posts: 2,396
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Re: Ambulance engine
Quote:
A 4 bolt block in theory can handle more power than a 2 bolt block if the proper camshaft, oiling system, pistons and all the other variables are in place. But if you built up 2 engines identically with the only difference being the main caps, they would make the same power. The 4 bolt "advantage" really doesn't come into play until you are pushing 450 hp or so, so it is more for racers than anything (and good bench racing ammo) Reality is, if your building a racing or hi-po street motor, a 20 or 30 year old block thats been run through the mill is not going to be the best choice anyway, regardless of the main caps, but "splayed" main caps can be installed on a 2 bolt block at a machine shop to make it stronger than a 4 bolt block if needed.
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Are you retired too? Nonsense! I'm in my prime |
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#32 | |
Prestige member Old Farts Club
Join Date: Nov 2005
Location: Cleveland
Posts: 502
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Re: Ambulance engine
Quote:
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Hey sombodys gotta do it! ![]() Last edited by jgrh64; 03-20-2008 at 11:13 PM. |
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#33 |
Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: Ambulance engine
so the weekend warrior with a stock 350 with the 4 bolt is realy no "better" off than the guy with the 2 bolt engine when we are talking 250 horsepower or so.
Boy!!! Could this fact ever burst some bubbles!!! All I ever here is how much better the 4 bolts are than the 2 bolts. My 383mild street engine is a studded 2 bolt. 400 horse estimated! The engine builder said the 4 bolt is unnessecary for this application.
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69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears: ![]() |
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#34 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Ambulance engine
This is just a guess but I think the engineers at GM choose the 4-bolt mains for trucks,not because of any tremendous high-reving Horse Power,but because they believed that full throttle operation at just past idle on up,say pulling a 10,000 Lb trailer out of a hole or starting out on an incline tended to put extra stress on the crank. That's just how I see it though. It could have just been a promotional thing,but really,how many buyers check the main cap specs when choosing a purchase?
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#35 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Ambulance engine
Quote:
He's right. The only engines I've seen that have had failure due to a problem with the mains were dirt track engines. The sustained high RPM can cause the cap to "Walk" and spin main bearings that can even break the crank (and the caps). I've seen that happen of on some budget dirt motors, but I've never seen a street/strip even bracket car have the engine fail because of a problem with mains. I ran a few hundred 1/4 passes over about 3 years on a 2 bolt, Vortec headed 350 in the 12.40 range on motor and a handful of 11.90 passes with 150 HP Nitrous Works plate system. The engine was still sound when I took it out to upgrade to the 383. I did have ARP main studs and Miloden windage tray on it.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#36 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Ambulance engine
Quote:
Your exactly right about that. That is reason that themajority of medium trucks with SBC's not only got 4 bolt mains, but forged steel cranks as well. The torsional stress on an engine is a lot different pulling a bunch of weight than a high RPM sprint in a relatively light vehicle is. Heavy loads have a pulling, twisting effect on the bottom end, and most bigger truck engines failures are due to the thrust bearing being worn completely out and allowing the crank to have excessive end play. The end plays eventually causes the rotation assembly to bind and lock up, throw rods and spin bearings. I've pulled a lot of engines out of medium duty dump trucks, box trucks, and pulpwood trucks (to get the 4 bolt engines and steel cranks) and seen as much as .030 - .060" end play. For those who don't know, factory end play of med duty truck engine is .005 - .011". One was so bad that big end of the rods had worn shiny spots that looked like chrome on the crank shaft couterweights. I can say that I really don't think 4 bolts are necessary for a 1/2 ton truck. You run out suspension and brakes WAY before you'd ever pull the weights consistant with the need for a 4 bolt main block. It was a good selling point though. Some people worship the 4 bolts like a mini-Buddha or something! ![]()
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#37 | |
Gone to greener pastures
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Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
[quote=larry may;2635213]
Quote:
I've built a some 350 truck engines & helped on more than a few circle track engines, none of them, ever, was a 2 bolt. So we'll just say that with my 35+ years of messing with vehicles, I'm not real bright; and let it go at that.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#38 |
Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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Re: Ambulance engine
El Jay....you probably have more experience with engine work than about 90% of the guys currently "building" hot rods. Don't feel badly that you might have missed something. The real crime is not asking the question!
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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#39 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Ambulance engine
I always "heard" that 4 bolt mains were used in trucks and cars with 4 barrel carburetors....this seems to be one of the ones that is not 100% accurate though.
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#40 | |
Gone to greener pastures
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Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
Quote:
I just wanted to make the point that all the 350's I'd worked on personally (mine, family, friends); & those I helped while "pitting" the race cars; I never saw a 2 bolt, 350, upside down on the engine stand. So I mistakenly assumed that 350's were all 4 bolt. That's what I like about this board. The members' knowledge is encyclopedic & they're willing to share it all. BTW, thanks for the input.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck Last edited by El Jay; 03-21-2008 at 03:49 AM. Reason: punctuation |
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#41 |
72 Chevelle Club
Join Date: Jun 2007
Location: Newton , Iowa
Posts: 2,052
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Re: Ambulance engine
I was trying to give you a honest answer so I hope you don't think I was being a smart a@@ . I didn't know if you had ever seen the inside of an engine ? Just don't want to give the wrong idea! Just trying to help. Bob
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I Have The Right To Remain Silent,But Lack The Ability 1972 Chevelle ... Mine 2006 Trailblazer... Hers 2002 Buick century ... Kids 2002 K1500 Z-71 EXT CAB ... Daily Driver 2005 Rockwood Roo ... For Camping 1974 Harley-Davidson XLH Sportster 84'' stroker |
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#42 | |
Gone to greener pastures
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Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
Quote:
Either it way, it don't matter. I'm never too damn old to learn. No harm, no foul. I've kinda wandered through life with the idea, "The only stupid question is the one that doesn't get asked." And, constructive criticism is a good thing. Have a good evening. El Jay
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#43 |
72 Chevelle Club
Join Date: Jun 2007
Location: Newton , Iowa
Posts: 2,052
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Re: Ambulance engine
I've kinda wandered through life with the idea, "The only stupid question is the one that doesn't get asked."
And, constructive criticism is a good thing. I couldn't agree with you more !!!! Bob
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I Have The Right To Remain Silent,But Lack The Ability 1972 Chevelle ... Mine 2006 Trailblazer... Hers 2002 Buick century ... Kids 2002 K1500 Z-71 EXT CAB ... Daily Driver 2005 Rockwood Roo ... For Camping 1974 Harley-Davidson XLH Sportster 84'' stroker |
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#44 |
Gone to greener pastures
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Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
Dayum!!
We're getting pretty philosophical for a couple of dumb assed gear heads!
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#45 | |
72 Chevelle Club
Join Date: Jun 2007
Location: Newton , Iowa
Posts: 2,052
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Re: Ambulance engine
Quote:
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I Have The Right To Remain Silent,But Lack The Ability 1972 Chevelle ... Mine 2006 Trailblazer... Hers 2002 Buick century ... Kids 2002 K1500 Z-71 EXT CAB ... Daily Driver 2005 Rockwood Roo ... For Camping 1974 Harley-Davidson XLH Sportster 84'' stroker |
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#46 | |
Gone to greener pastures
![]() Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
Quote:
Somebody knows how to make light of stuff!!
__________________
'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#47 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Ambulance engine
How many philosophers does it take to change a light bulb?
Depends on how you define "change". ![]()
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 03-21-2008 at 06:59 AM. |
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#48 |
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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Re: Ambulance engine
All I have to say is this is a funny thread right here!
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#49 |
Gone to greener pastures
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Location: Gateway to the Delta
Posts: 7,354
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Re: Ambulance engine
I thought that nowadays it was "hope & change."
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#50 |
Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: Ambulance engine
So if it "was" a "real" "factory" ambulance engine .....................then it must have been a 400, with 202 heads, 4 bolt, high compression Corvette bottom end, a divorced custom transfercase with a built turbo 400, and the guy had no idea what he had and the guy who got it scored a gold mine!!!!
Oh, I guess it supposedly had the rare factory tach as well!!! ![]() ![]() ![]()
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69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears: ![]() |
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