Big Block? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Purs · 02-05-2003, 10:16 PM

Alright, Can someone help me with these numbers off a Big Block?

off the front of the passenger side head: C4A176626

A buddy of mine got these numbers off of it, but I don't know what part of the engine they came off of.... 40524TRW

Thanks for all the help.

superchevy · 02-05-2003, 10:29 PM

Hey Brit, are you sure that is C4A and not CLA or CKA?
I'm showing CLA as a '72 402 with auto trans.
I don't show a C4A prefix.
Maybe someone else knows.
SC

**68 Stepside** · 02-05-2003, 10:31 PM

1974 TRW Truck 454 245 400 LS-4 VIN Z, L, f.d, 20, 30
1979 TRW Truck 454 210 400 LF-8 VIN S, fwd, 20

Definitely a 454....wish I had one

*racedvl* · 02-05-2003, 10:33 PM

Hey, TJ, you could have the "LAMA"! You know what I wanna trade for it. . . .

**68 Stepside** · 02-05-2003, 10:35 PM

Let's decode it a little further (can't guarantee I'm correct) 4-- not sure, maybe it's an F? 05-month of May 24-24th day of the month

TRW-- suffix code, look up ^^^^

**68 Stepside** · 02-05-2003, 10:35 PM

LMAO...I don't need the "LAMA"....

Purs · 02-05-2003, 11:32 PM

SC, I'm not sure, I thought it was a 4 but I'll look again tomorrow.

68 Stepside, forgive me, I don't understand. How are you sure it's a 454? Wouldn't that mean it was externally balanced? shouldn't I be able to tell that by looking at the harmonic balancer? I appreciate your help.

superchevy · 02-06-2003, 12:59 AM

PURS,
Get the block casting number and date code off the rear below the intake but right above the bellhousing. Casting number will be on left, date code on right side. That will help.
Then go to www.mortec.com and see what you have.
SC

Purs · 02-06-2003, 01:01 AM

I went to mortec with the numbers I've already got and couldn't find anything. I'll try to get the other one's tomorrow and check mortec again. Thanks SC.

02-05-2003, 10:16 PM	#1
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	Big Block? Alright, Can someone help me with these numbers off a Big Block? off the front of the passenger side head: C4A176626 A buddy of mine got these numbers off of it, but I don't know what part of the engine they came off of.... 40524TRW Thanks for all the help. __________________ "Experience is what you get when you didn't get what you wanted."

02-05-2003, 10:29 PM	#2
superchevy Got big-block? Join Date: Jul 2000 Location: Austin, Texas Posts: 2,453	Hey Brit, are you sure that is C4A and not CLA or CKA? I'm showing CLA as a '72 402 with auto trans. I don't show a C4A prefix. Maybe someone else knows. SC __________________ '68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396

02-05-2003, 10:31 PM	#3
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	1974 TRW Truck 454 245 400 LS-4 VIN Z, L, f.d, 20, 30 1979 TRW Truck 454 210 400 LF-8 VIN S, fwd, 20 Definitely a 454....wish I had one __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

02-05-2003, 10:35 PM	#5
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	Let's decode it a little further (can't guarantee I'm correct) 4-- not sure, maybe it's an F? 05-month of May 24-24th day of the month TRW-- suffix code, look up ^^^^ __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

02-05-2003, 10:35 PM	#6
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	LMAO...I don't need the "LAMA".... __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

02-05-2003, 10:33 PM	#4
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	Hey, TJ, you could have the "LAMA"! You know what I wanna trade for it. . . .

02-05-2003, 11:32 PM	#7
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	SC, I'm not sure, I thought it was a 4 but I'll look again tomorrow. 68 Stepside, forgive me, I don't understand. How are you sure it's a 454? Wouldn't that mean it was externally balanced? shouldn't I be able to tell that by looking at the harmonic balancer? I appreciate your help. __________________ "Experience is what you get when you didn't get what you wanted."

02-06-2003, 12:59 AM	#8
superchevy Got big-block? Join Date: Jul 2000 Location: Austin, Texas Posts: 2,453	PURS, Get the block casting number and date code off the rear below the intake but right above the bellhousing. Casting number will be on left, date code on right side. That will help. Then go to www.mortec.com and see what you have. SC __________________ '68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396

02-06-2003, 01:01 AM	#9
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	I went to mortec with the numbers I've already got and couldn't find anything. I'll try to get the other one's tomorrow and check mortec again. Thanks SC. __________________ "Experience is what you get when you didn't get what you wanted."



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