Block numbers and input on a build - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bulkin'up73chevy · 12-06-2006, 02:34 PM

So I have this block number 397 9918 Is it a 350 or a 305 block I don't have a chart or anything so I have no Idea. Or there is a number 41 next it printed on the block.
So I am currently building my 4-wheel drive and I got this for the build rv2 cam edlebrock performer intake HEI distributor, edelbrock 650 carb. I understand this is about a 300 horsepower build. Am I right?? Or what should I expect. I have all the stuff needed to tune it right. What can I expect guys. Haven't been on in a long time.

hiway · 12-06-2006, 03:51 PM

http://www.mortec.com/castnum.htm (for casting numbers)

Depends on cam specs, head, and such. Good start though.

bulkin'up73chevy · 12-06-2006, 05:25 PM

194 regular cast iron heads I don't know the specific cam specs just its in the rv2 catagory is what it is going to be and I'm thinking steel crank??

hiway · 12-06-2006, 06:25 PM

I didn't see your number block on the list. Anyway, a 350 with smog type big chamber heads, flat top pistons, decent rv cam, your mentioned induction, and some headers should make 300hp or close. More important is that it'll have good low end torque for your 4x4.

*Billla* · 12-07-2006, 06:24 AM

The intake and carb choice are fine. I'm not sure what the "RV2" cam is - do you have specifics? 300 HP will require 9.2 - 9.5 CR and some fairly decent heads.

lurch115 · 12-07-2006, 07:04 PM

that casting number isn't on the list.... but another place you can also look on the block is on either side of it....there should be a 3 digit casting number...what would also help is if you could describe it a little more....like what year the vehicle it came out of was....as for the parts you have...should make a nice motor...we just resently put a Lunati RV2 cam in a friend of mine's truck and although it sounded stock it was far from it....it is a 4X4 with a 4spd and he can light up 35's though all 4 gears.... not to meantion pulling a loaded semi out of amuddy field....

:nut: :happy:

bulkin'up73chevy · 12-08-2006, 01:24 AM

nice lurch thanks guys for the info. Yah I don't know the specs but the heads are 194's that's all I know. Yah it's a fully locked up 4-wheel drive lurch blazer. And I found the block it's a 350. Putting new crank bearings in tomorrow and putting it all back together and in the truck hopefully have it running by midnight.

jr2 · 12-13-2006, 02:58 PM

I'd be willing to bet the casting # is actually 3970010...Look again...

12-06-2006, 02:34 PM	#1
bulkin'up73chevy Registered User Join Date: Jan 2004 Location: Washougal WA Posts: 85	Block numbers and input on a build So I have this block number 397 9918 Is it a 350 or a 305 block I don't have a chart or anything so I have no Idea. Or there is a number 41 next it printed on the block. So I am currently building my 4-wheel drive and I got this for the build rv2 cam edlebrock performer intake HEI distributor, edelbrock 650 carb. I understand this is about a 300 horsepower build. Am I right?? Or what should I expect. I have all the stuff needed to tune it right. What can I expect guys. Haven't been on in a long time. __________________ FAMILY MAN 77 CHEVY LB 4X4 78 GMC LB 4X4 "TOWED AWAY" 77 GMC FLATBED 502 CADDY BB. 85 CHEVY BLAZER (wrecked) 86 CHEVY LB 2WD 77,000 ORIGINAL MILES 86 RX7 "SOLD" 88 RX7 "SOLD" 88 SUPRA "SCRAPPED" DIVORCE SUCKS 2003 HONDA CBR 600 F4I "SOLD" DIVORCE SUCKS

12-06-2006, 03:51 PM	#2
hiway Mad Scientist Join Date: Jul 2005 Location: Enola Arkansas Posts: 380	Re: Block numbers and input on a build http://www.mortec.com/castnum.htm (for casting numbers) Depends on cam specs, head, and such. Good start though. __________________ Everythang relates to Beer! 86 1/2ton on tons! sbc/465/208/D60/14/35's 81 Postal....with 468 bbc 97 Merc Marq comuter 07 Suburban 02 Danger Ranger

12-06-2006, 05:25 PM	#3
bulkin'up73chevy Registered User Join Date: Jan 2004 Location: Washougal WA Posts: 85	Re: Block numbers and input on a build 194 regular cast iron heads I don't know the specific cam specs just its in the rv2 catagory is what it is going to be and I'm thinking steel crank?? __________________ FAMILY MAN 77 CHEVY LB 4X4 78 GMC LB 4X4 "TOWED AWAY" 77 GMC FLATBED 502 CADDY BB. 85 CHEVY BLAZER (wrecked) 86 CHEVY LB 2WD 77,000 ORIGINAL MILES 86 RX7 "SOLD" 88 RX7 "SOLD" 88 SUPRA "SCRAPPED" DIVORCE SUCKS 2003 HONDA CBR 600 F4I "SOLD" DIVORCE SUCKS

12-06-2006, 06:25 PM	#4
hiway Mad Scientist Join Date: Jul 2005 Location: Enola Arkansas Posts: 380	Re: Block numbers and input on a build I didn't see your number block on the list. Anyway, a 350 with smog type big chamber heads, flat top pistons, decent rv cam, your mentioned induction, and some headers should make 300hp or close. More important is that it'll have good low end torque for your 4x4. __________________ Everythang relates to Beer! 86 1/2ton on tons! sbc/465/208/D60/14/35's 81 Postal....with 468 bbc 97 Merc Marq comuter 07 Suburban 02 Danger Ranger Last edited by hiway; 12-07-2006 at 07:53 AM.

12-07-2006, 06:24 AM	#5
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,814	Re: Block numbers and input on a build The intake and carb choice are fine. I'm not sure what the "RV2" cam is - do you have specifics? 300 HP will require 9.2 - 9.5 CR and some fairly decent heads. Last edited by Billla; 12-07-2006 at 06:27 AM.

12-07-2006, 07:04 PM	#6
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: Block numbers and input on a build that casting number isn't on the list.... but another place you can also look on the block is on either side of it....there should be a 3 digit casting number...what would also help is if you could describe it a little more....like what year the vehicle it came out of was....as for the parts you have...should make a nice motor...we just resently put a Lunati RV2 cam in a friend of mine's truck and although it sounded stock it was far from it....it is a 4X4 with a 4spd and he can light up 35's though all 4 gears.... not to meantion pulling a loaded semi out of amuddy field.... :nut: :happy: __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

12-08-2006, 01:24 AM	#7
bulkin'up73chevy Registered User Join Date: Jan 2004 Location: Washougal WA Posts: 85	Re: Block numbers and input on a build nice lurch thanks guys for the info. Yah I don't know the specs but the heads are 194's that's all I know. Yah it's a fully locked up 4-wheel drive lurch blazer. And I found the block it's a 350. Putting new crank bearings in tomorrow and putting it all back together and in the truck hopefully have it running by midnight. __________________ FAMILY MAN 77 CHEVY LB 4X4 78 GMC LB 4X4 "TOWED AWAY" 77 GMC FLATBED 502 CADDY BB. 85 CHEVY BLAZER (wrecked) 86 CHEVY LB 2WD 77,000 ORIGINAL MILES 86 RX7 "SOLD" 88 RX7 "SOLD" 88 SUPRA "SCRAPPED" DIVORCE SUCKS 2003 HONDA CBR 600 F4I "SOLD" DIVORCE SUCKS

12-13-2006, 02:58 PM	#8
jr2 Registered User Join Date: Jun 2003 Location: Snohomish,Washington Posts: 226	Re: Block numbers and input on a build I'd be willing to bet the casting # is actually 3970010...Look again... __________________ -John II "A Little's Good! A Lot's Better! & Too Much is Just Right!!" -1978 Chevy C10 Stepside 350/4sp/12 bolt -1967 Nova 2dr HT & a couple others...

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