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#1 |
Registered User
Join Date: Dec 2008
Location: wellington ohio
Posts: 55
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B.B. ID'ing
SCORE!!!(maybe) yesterday i got a 427 BB that came out of a C-75 chevy, early to mid 70's I was told. Problem is I need to find out if its a tall block or not and if someone could tell me the differents between the two I would greatly appreciate the help. the stamped number in the block is T0404AHT. Thanks, Pat
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#2 |
Registered User
Join Date: May 2011
Location: Syracuse, Utah
Posts: 1,930
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Re: B.B. ID'ing
Pretty easy to tell with a glance. Look at the upper water pump mounting in relation to the top of the deck. Standard height is pretty close tall deck is not so. If engine is original to the C-75 you probably have a tall deck.
Good luck.
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#3 |
Registered User
Join Date: Aug 2011
Location: Northern California
Posts: 189
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Re: B.B. ID'ing
Tonawanda plant, built April 4 1973. 427 truck engine for manual trans. 230 HP. Application: L-43 60.
Almost certainly a tall block. As I recall, the tall blocks used 4-ring pistons.
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1971 GMC C2500 Custom Camper - Second Owner. 350/TH350, Dana 60 Rear. |
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#4 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: B.B. ID'ing
On a "standard" deck BBC the water pump "legs" will be flush with the deck, On a tall deck there will be a space.
A STD deck in will have HI PERF PASS cast in the block. A tall deck will have TRUCK cast in the block. Standard deck Tall deck |
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#5 |
Registered User
Join Date: Dec 2008
Location: wellington ohio
Posts: 55
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Re: B.B. ID'ing
THANK YOU GUYS!!! the guy was going to scrap the engine and I couldn't let him do it so he let me have it for a small price(far below scrap value) . now I have to ask myself what the heck to do with it?
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#6 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: B.B. ID'ing
They are worth scrap value for the forged steel crank & miscellaneous bolts & hardware. The block/heads/Intake are junk.
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#7 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: B.B. ID'ing
I've never understood why these motors aren't more sought after: you'd think they'd be ideal for building a stroker motor, given the tall deck.
They're the same bore as a passenger 427 and 454. I'd think you could ditch the extra ring without problem, so a new crank rod and pistons should net you a big displacement, tall-deck big block. Maybe they're too hard to clearance for stroker cranks?
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#8 |
Registered User
Join Date: Aug 2011
Location: Northern California
Posts: 189
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Re: B.B. ID'ing
Extra ring means longer piston, hence the reason for being of a tall block. I wouldn't call it "junk", though. It is an engine designed to withstand hard duty usage.
It seems like an excellent choice for a work truck or tow rig.
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1971 GMC C2500 Custom Camper - Second Owner. 350/TH350, Dana 60 Rear. |
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#9 |
Registered User
Join Date: Jul 2011
Location: Farmville, Va
Posts: 3,026
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Re: B.B. ID'ing
I would think value would be smal a 5.7 350 also comes 290hp
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#10 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: B.B. ID'ing
It's not about the HP for a tll deck.They're built for torque and long life.
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#11 |
Registered User
Join Date: Jun 2012
Posts: 1,089
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Re: B.B. ID'ing
Yeah it would be nice to know the torque numbers on one.
It would be a great motor to put in a C30 with a 4 or 5sp . Posted via Mobile Device |
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#12 | |
Senior Member
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Location: Cedar Park, Texas
Posts: 7,496
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Re: B.B. ID'ing
Quote:
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#13 |
Registered User
Join Date: Jun 2010
Location: British Columbia
Posts: 192
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Re: B.B. ID'ing
The tall deck blocks are perfect for making big inch stroker motors. My motor for my project is a tall deck 427. Getting bored out .100 and 6.7 rod, 4.25" crank netting 505 cubic inches. All the manufacturers make tall deck aluminum intakes now so no spacers required. The stock cranks in them are 3.76" forged factory gm which are the same as the big horse power 396 and they r desirable.
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If you can't impress them with your inteligence, dazzle'm with your stupidity 1969 GMC lwb 2wheel drive can you say big stroker motor to come hehe |
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