motor size? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**truckdude239** · 09-29-2005, 10:02 AM

i just bought an 1971 chevy c-10 pick up the owner told me he thinks it has an 305 or 327. I know that anything from 305 -350 are the same blocks. can anyone tell how to adentify the motor so i can order parts for it?

1969 C/K CST · 09-29-2005, 10:18 AM

Can you locate the casting #'s? http://www.mortec.com/castnum.htm

**truckdude239** · 09-30-2005, 07:23 AM

no i couldn't find te numbers although i know it is the orginal engine for the truck
i did find out from the vin numbers that the motor is a 2barrel carbed 350 i got the manifold for a 4 barrel carb to go back on it

**special-K** · 09-30-2005, 08:41 AM

FYI,if it wasn`t a 350 it would have been a 307.The 305 came out later.Welcome to this site and enjoy!

bigjimzlll · 09-30-2005, 09:17 AM

FYI also...the 305 block is different then a 350 block. The bore on a 305 is much smaller and it can't be over bored to 4" to make a 350.

motocrosschump · 09-30-2005, 09:32 AM

if its truly OE then its not a 305

farside847 · 09-30-2005, 12:04 PM

My money is on the 307 - they were super common...

**truckdude239** · 10-06-2005, 11:49 PM

i know for a fact its not an 307 because the 307s have the plugs pointed toward each other and mine aren't

GMC AMI · 10-07-2005, 06:41 AM

Quote:

Originally Posted by truckdude239

i know for a fact its not an 307 because the 307s have the plugs pointed toward each other and mine aren't

My 68 4x4 has the original 307, #'s all checked out and the plugs are straight and not pointing at each other!

cst70rocket · 10-07-2005, 07:52 AM

Quote:

Originally Posted by truckdude239

i know for a fact its not an 307 because the 307s have the plugs pointed toward each other and mine aren't

There was never a 307 that came out with angled plug heads. You may be thinking of another breed of 307, or 301, but not a chevy 307. Is it a gutless turd? it's a 307!
Kirk

GMC Jim · 10-07-2005, 05:10 AM

1971 Chev Service Manual lists -- 250, 292 Cu.in - 6cyl and 307,350,402 cu.in - V-8's

racer face · 10-07-2005, 10:21 PM

if the plugs point at each other. isn't that 2:02 angle plug heads?

327v8 · 10-07-2005, 10:33 PM

How do you tell the difference between a 307 and a 350 besides the numbers on the block ?

I have a block in the garage, and I looked the numbers up in a book I have. The information I get is it is either one. So I need to know another way to check.

09-29-2005, 10:02 AM	#1
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	motor size? i just bought an 1971 chevy c-10 pick up the owner told me he thinks it has an 305 or 327. I know that anything from 305 -350 are the same blocks. can anyone tell how to adentify the motor so i can order parts for it?

09-29-2005, 10:18 AM	#2
1969 C/K CST A.K.A- Crummy Join Date: Jun 2005 Location: NC foothills Posts: 3,025	Can you locate the casting #'s? http://www.mortec.com/castnum.htm __________________ 2003 Silverado Z71 Are fishermen all liars? Last edited by 1969 C/K CST; 09-29-2005 at 10:20 AM.

09-30-2005, 08:41 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	FYI,if it wasn`t a 350 it would have been a 307.The 305 came out later.Welcome to this site and enjoy! __________________ "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 ~

09-30-2005, 09:17 AM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	FYI also...the 305 block is different then a 350 block. The bore on a 305 is much smaller and it can't be over bored to 4" to make a 350. __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

09-30-2005, 09:32 AM	#6
motocrosschump Registered User Join Date: May 2005 Location: Texarkana, AR 71854 Posts: 397	if its truly OE then its not a 305 __________________ 2006 Titan SE Crew Cab Daily Driver 2005 Mazda Tribute (Wifes car) 1969 C10 SWB 350/3 Fleet "Max" 1969 Chevelle 2 door 350/3

09-30-2005, 07:23 AM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	no i couldn't find te numbers although i know it is the orginal engine for the truck i did find out from the vin numbers that the motor is a 2barrel carbed 350 i got the manifold for a 4 barrel carb to go back on it

09-30-2005, 12:04 PM	#7
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	My money is on the 307 - they were super common... __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

10-06-2005, 11:49 PM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	i know for a fact its not an 307 because the 307s have the plugs pointed toward each other and mine aren't

10-07-2005, 05:10 AM	#11
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	1971 Chev Service Manual lists -- 250, 292 Cu.in - 6cyl and 307,350,402 cu.in - V-8's __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

10-07-2005, 10:21 PM	#12
racer face Registered User Join Date: Dec 2004 Location: Wellington Ohio(GO BUCKEYES) Posts: 74	if the plugs point at each other. isn't that 2:02 angle plug heads? __________________ Pat ______________________ 1968 1 Ton Dually Flatbed 327/th400 1968 C30 Open Road 327/th400 1997 F350 CREWCAB 4X4 460 BIGBLOCK

10-07-2005, 10:33 PM	#13
327v8 Registered User Join Date: Aug 2004 Location: north of Atlanta, Ga. Posts: 31	How do you tell the difference between a 307 and a 350 besides the numbers on the block ? I have a block in the garage, and I looked the numbers up in a book I have. The information I get is it is either one. So I need to know another way to check. __________________ 1965 Fleetside http://www.msnusers.com/Bedwood



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