okay guys I have a question. on this website the onfo that it gives me says that all lt1 engines were made from the 010 block. I was at a show on the weekend and I talked to a guy with a factory 72 z28 with 68000 orig. miles but his block was an 014 block can this be true. the number on the block on the frontnear the head was vo303cks and then the last 6 digits of the vin can this be true. Waht other blocks did they use.

I don't know the answer you're looking for but I do know that you cannot see the 010 or 020 high nickel casting with a transmission bolted to the block. It is behind the flywheel to the side of a waterjacket plug back there.

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'73 RS/Z-28 All original. Still needs some work......

If my infi is right, then your alittle off.

My info shows the 70-72 LT1 was built from a "104" casting block. Not a 010, or 014

Here's all the info I got on thr LT1

1970 engine is used as the baseline. 1971 & 72 will be identical except where noted
1971 had compression dropped from 11.0:1 to 9.0:1 by using different pistons and bigger CC cylinder head.
1972 is identical to 1971, except horsepower dropped 10 and rating was changed from GROSS HP to NET HP.

1970 - 1972 LT-1
1970 Z28 Engine - LT1 360hp (gross)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CTB, CTC
Crankshaft 330550Forged steel
Heads 3927186 63.995 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam3 9721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Domed type - yields 11.0:1 compression
Intake 3972110
Carb (A/T)3972120 Holley List 4490, 780cfm , 4150 series - 4BBL
Carb (A/T)3972122 Holley List 4554, 780cfm , 4150 series - 4BBL w/NB2 (Calif)
Carb (M/T)3972121 Holley List 4555, 780cfm , 4150 series - 4BBL
Carb (M/T)3972123 Holley List 4489, 780cfm , 4150 series - 4BBL w/NB2 (Calif)
LH Exhaust 3942527 2.026", Rear Outlet, AIR
RH Exhaust 3946826 1.96", Rear Outlet, AIR
Distributor 1112019single point w/RFI
Alternator: Delcotron 37 Amp, part # 1100837
Water Pump: 3953692
crank pulley: 9956668 coded CG
Deep Groove Water Pump Pulley: 3995647 coded AP
Power steering Pulley: last four #'s 1105
Note: Rods: LT1 "pink" rods. 5.7", 6th design, forged steel, shot peened, magnafluxed, heat treated, high RPM rod bolts and expensive.
Intake 3972116 listed as service replacement manifold.

1971 Z28 Engine - LT1 330hp (gross, 275hp NET)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CGP, CGR
Crankshaft 330550Forged steel
Heads 3973487 75.47 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam 39721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Flat w/valve relief - yields 9.0:1 compression
Intake 3959594
Carb (A/T)3989022 Holley List 4800, 780cfm , 4150 series - 4BBL
Carb (M/T)3989021 Holley List 4801, 780cfm , 4150 series - 4BBL
LH Exhaust 3989041 Rear exit, log type w/AIR, 2.026 outlet
RH Exhaust 3986330 Rear exit, log type w/AIR, 1.96 outlet
Distributor 1112049 Manual Trans, RFI, single point w/vacuum
Distributor 1112074Auto Trans, RFI, single point w/vacuum
Alternator: Delcotron 37 Amp, part # 1100837
Water Pump: 3957170
Cylinder head has swirl polished valves and chrome valve stems.
Alternate cylinder head was 3986316 (unverified).

1972 Z28 Engine - LT1 255hp (net)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CKS, CKT
Crankshaft 330550Forged steel
Heads 3998916 76.18 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam 39721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Flat w/valve relief - yields 9.0:1 compression
Intake 3959594
Carb (A/T)3997788 GB Holley List 6238, 780cfm , 4150 series - 4BBL
Carb (M/T)3999263 GA Holley List 6239, 780cfm , 4150 series - 4BBL
LH Exhaust 3989041 Rear exit, log type w/AIR, 2.026 outlet
RH Exhaust 3986330 Rear exit, log type w/AIR, 1.96 outlet
Distributor 1112095Manual Trans, RFI, single point w/vacuum
Distributor 1112049Auto Trans, RFI, single point w/vacuum
Distributor 11121532nd design - M/T, single point w/vacuum & ECC Distributor11121562nd design - A/T, single point w/vacuum & ECC
Alternator: Delcotron 37 Amp, part # 1102454
Water Pump: 6263701
unverified but alternate head casting #'s include: 3973487, 3973487X, & 3998993

I see, you're talking about the actual casting #, not a high nickel casting.

Gotcha.

My book lists "CKS" as a 1972, 255hp/LT1, a 1973, 145hp engine and a 1977, 170hp engine.

pdq67

If my infi is right, then your alittle off.

My info shows the 70-72 LT1 was built from a "104" casting block. Not a 010, or 014

Here's all the info I got on thr LT1

1970 engine is used as the baseline. 1971 & 72 will be identical except where noted
1971 had compression dropped from 11.0:1 to 9.0:1 by using different pistons and bigger CC cylinder head.
1972 is identical to 1971, except horsepower dropped 10 and rating was changed from GROSS HP to NET HP.

1970 - 1972 LT-1
1970 Z28 Engine - LT1 360hp (gross)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CTB, CTC
Crankshaft 330550Forged steel
Heads 3927186 63.995 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam3 9721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Domed type - yields 11.0:1 compression
Intake 3972110
Carb (A/T)3972120 Holley List 4490, 780cfm , 4150 series - 4BBL
Carb (A/T)3972122 Holley List 4554, 780cfm , 4150 series - 4BBL w/NB2 (Calif)
Carb (M/T)3972121 Holley List 4555, 780cfm , 4150 series - 4BBL
Carb (M/T)3972123 Holley List 4489, 780cfm , 4150 series - 4BBL w/NB2 (Calif)
LH Exhaust 3942527 2.026", Rear Outlet, AIR
RH Exhaust 3946826 1.96", Rear Outlet, AIR
Distributor 1112019single point w/RFI
Alternator: Delcotron 37 Amp, part # 1100837
Water Pump: 3953692
crank pulley: 9956668 coded CG
Deep Groove Water Pump Pulley: 3995647 coded AP
Power steering Pulley: last four #'s 1105
Note: Rods: LT1 "pink" rods. 5.7", 6th design, forged steel, shot peened, magnafluxed, heat treated, high RPM rod bolts and expensive.
Intake 3972116 listed as service replacement manifold.

1971 Z28 Engine - LT1 330hp (gross, 275hp NET)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CGP, CGR
Crankshaft 330550Forged steel
Heads 3973487 75.47 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam 39721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Flat w/valve relief - yields 9.0:1 compression
Intake 3959594
Carb (A/T)3989022 Holley List 4800, 780cfm , 4150 series - 4BBL
Carb (M/T)3989021 Holley List 4801, 780cfm , 4150 series - 4BBL
LH Exhaust 3989041 Rear exit, log type w/AIR, 2.026 outlet
RH Exhaust 3986330 Rear exit, log type w/AIR, 1.96 outlet
Distributor 1112049 Manual Trans, RFI, single point w/vacuum
Distributor 1112074Auto Trans, RFI, single point w/vacuum
Alternator: Delcotron 37 Amp, part # 1100837
Water Pump: 3957170
Cylinder head has swirl polished valves and chrome valve stems.
Alternate cylinder head was 3986316 (unverified).

1972 Z28 Engine - LT1 255hp (net)
Casting # GM P/NDescription
Block 39700104 bolt main, suffix codes: CKS, CKT
Crankshaft 330550Forged steel
Heads 3998916 76.18 cc, 2.02/1.6 valves, screw in studs & guide plates
Cam 39721823972178symbol: (1) square Solid lifter - 0.458(I)/0.484(E) lift, 317I/346E duration
Pistons Flat w/valve relief - yields 9.0:1 compression
Intake 3959594
Carb (A/T)3997788 GB Holley List 6238, 780cfm , 4150 series - 4BBL
Carb (M/T)3999263 GA Holley List 6239, 780cfm , 4150 series - 4BBL
LH Exhaust 3989041 Rear exit, log type w/AIR, 2.026 outlet
RH Exhaust 3986330 Rear exit, log type w/AIR, 1.96 outlet
Distributor 1112095Manual Trans, RFI, single point w/vacuum
Distributor 1112049Auto Trans, RFI, single point w/vacuum
Distributor 11121532nd design - M/T, single point w/vacuum & ECC Distributor11121562nd design - A/T, single point w/vacuum & ECC
Alternator: Delcotron 37 Amp, part # 1102454
Water Pump: 6263701
unverified but alternate head casting #'s include: 3973487, 3973487X, & 3998993
the Block number is indeed 3970010
the 4 you are referring to is part of the next statement "4 bolt main".
It should (and does now) read:
Block 3970010 4 bolt main, suffix codes: CTB, CTC
you stated:
Block 39700104 bolt main, suffix codes: CTB, CTC
see the difference?
I have spent too much time lately looking at these ...
Frank

Alan Colvin's book says that yes indeed, the 3970014 block was used in 1972 along with the 3970010 block for building Z28 engines. These two blocks were essentially the same, and the Z28 versions were all 4 bolt main ones.

FYI, the 010 020 is also cast into the block behind the timing cover, not just on the back of the block.

FYI, the 010 020 is also cast into the block behind the timing cover, not just on the back of the block.

+1. This is true on my 010 block. The 020 is noted in both places.

FYI, the 010 020 is also cast into the block behind the timing cover, not just on the back of the block.

And, contrary to what many people believe, the 010 and 020 do not indicate nickel content or any other metal content. They only help identify the molds used to cast the block.

okay guys I have a question. on this website the onfo that it gives me says that all lt1 engines were made from the 010 block. I was at a show on the weekend and I talked to a guy with a factory 72 z28 with 68000 orig. miles but his block was an 014 block can this be true. the number on the block on the frontnear the head was vo303cks and then the last 6 digits of the vin can this be true. Waht other blocks did they use.
At least 2 camaros with 014 blocks have been seen The 014 block is a Tonawanda casting 2 and 4 bolt ."Strike shortage it seems" The block/ engine ? was sent to flint for build / instalation,All have the V before the built date even though they were Tonawanda castings . They can be identified be the cast date is on the block behind the drivers side head & not on the rt side as with flint blocks .