which engine should i use? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ET702 · 08-27-2013, 11:20 PM

i have two engines i can use for my 72 c10 stepside. one is a gm hecho in mexico block 10066036, 86-up 350 Car & Truck 4-bolt, 1-piece seal with a cam , or gm usa block 3970010, 69-79 350 car & Truck 4-Bolt Most common, I have aluminum heads to put on either one, Im hopping the cam can be used with black but im not sure.

mmiddle · 08-28-2013, 12:02 AM

That's a tuffy... The old block is going to have a high nickel content= stronger and better... but the new block will have roller cam provisions and less chance of a rear main oil leak. So, for me the deciding factor would be how much HP are you building and how hard are you going to run it. Is this going to be your DD or just a sunday driver?

Over all, I think I would go with the newer block due to the eventual oil leak from the two piece seal unless I had a steel crank to go in it. Plus the newer block does have better oiling passages than the older one.

ET702 · 08-30-2013, 07:55 PM

no its not going to be my daily driver and not to much horsepower probable around 350 to 400. im getting the engine mounts done this week. the are the tubular 3 piece ones so i wanted to mock it up with the one that im going to use. i wish i had a steel crank but i look into getting one thank for the info.

08-27-2013, 11:20 PM	#1
ET702 Registered User Join Date: Sep 2010 Location: las vegas, nv Posts: 67	which engine should i use? i have two engines i can use for my 72 c10 stepside. one is a gm hecho in mexico block 10066036, 86-up 350 Car & Truck 4-bolt, 1-piece seal with a cam , or gm usa block 3970010, 69-79 350 car & Truck 4-Bolt Most common, I have aluminum heads to put on either one, Im hopping the cam can be used with black but im not sure. Last edited by ET702; 08-27-2013 at 11:40 PM.

08-28-2013, 12:02 AM	#2
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: which engine should i use? That's a tuffy... The old block is going to have a high nickel content= stronger and better... but the new block will have roller cam provisions and less chance of a rear main oil leak. So, for me the deciding factor would be how much HP are you building and how hard are you going to run it. Is this going to be your DD or just a sunday driver? Over all, I think I would go with the newer block due to the eventual oil leak from the two piece seal unless I had a steel crank to go in it. Plus the newer block does have better oiling passages than the older one. __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

08-30-2013, 07:55 PM	#3
ET702 Registered User Join Date: Sep 2010 Location: las vegas, nv Posts: 67	Re: which engine should i use? no its not going to be my daily driver and not to much horsepower probable around 350 to 400. im getting the engine mounts done this week. the are the tubular 3 piece ones so i wanted to mock it up with the one that im going to use. i wish i had a steel crank but i look into getting one thank for the info.



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