Please help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10secopcar · 01-16-2009, 05:00 PM

I am new to the carburated world. I have a 71 swb with a 402 I think. it is a big block but I have no idea where to look for casting numbers, block or head. The tag on driver fender says part number 3994016, is this the block casting number? I did however look up the exhaust manifold numbers and they are apparently from a 73 454 police edition motor. Are these the ramhorn manifolds? It is bagged and i wanna put longtube 1"3/4 headers on it. But I am not sure about the oval port or round port part and not sure if they will hang below the frame. Sry for all the questions just new to this era of truck and don't know alot about them.

Shyguy · 01-16-2009, 05:34 PM

The engine casting numbers are normally back by the distributor.

There are numbers on the front of the passenger-side of the engine on a flat surface just below the head, that is the number I have always used to identify an engine because it is the easiest to get to.

I think for casting numbers and such you could use "Mortec.com" or post the numbers on here and I am sure some one will let you know what they mean.

Danny

**special-K** · 01-16-2009, 06:35 PM

www.mortec.com

01-16-2009, 05:00 PM	#1
10secopcar Registered User Join Date: Jan 2009 Location: Jones, Ok Posts: 13	Please help. I am new to the carburated world. I have a 71 swb with a 402 I think. it is a big block but I have no idea where to look for casting numbers, block or head. The tag on driver fender says part number 3994016, is this the block casting number? I did however look up the exhaust manifold numbers and they are apparently from a 73 454 police edition motor. Are these the ramhorn manifolds? It is bagged and i wanna put longtube 1"3/4 headers on it. But I am not sure about the oval port or round port part and not sure if they will hang below the frame. Sry for all the questions just new to this era of truck and don't know alot about them.

01-16-2009, 05:34 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Please help. The engine casting numbers are normally back by the distributor. There are numbers on the front of the passenger-side of the engine on a flat surface just below the head, that is the number I have always used to identify an engine because it is the easiest to get to. I think for casting numbers and such you could use "Mortec.com" or post the numbers on here and I am sure some one will let you know what they mean. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

01-16-2009, 06:35 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Please help. www.mortec.com __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 01-16-2009 at 06:36 PM.



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