Whats The Diffrence In A 307 And A 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ncblazer72 · 10-21-2005, 04:01 PM

This guy i know has a 1969 blazer..beautiful blazer and is selling it. I am thinking about it but he told me it had a 307. I am guessing 307 is like a 305 to a 350? thanks

cst70rocket · 10-21-2005, 05:13 PM

307 is a 3.875 bore x a 3.25 stroke, picture a 283 with a 327 crank in it. A 350 is a 4.00 bore x a 3.48 stroke. 350 has much more potential, but a 307 will run forever weakly!
Kirk

krue · 10-21-2005, 06:05 PM

Yeah, but look at the bright side, anywhere a 307 is a 350 will swap right in.

ncblazer72 · 10-23-2005, 01:48 PM

yeah..I have a 72 with a 350 with 65k orginal miles on it. I was thinking about getting this one and swapping engines. Thanks guys

bouncytruck · 10-23-2005, 08:22 PM

If that 307 has a 3 speed, it probably has a dana 20 transfer case. If you plan on swapping the engine and the transmission out, you'll probably want to swap the t-case too. They are a decent t-case, but not as strong as a 205.

ncblazer72 · 10-24-2005, 12:33 PM

Thanks for the infor in the swaping idea. Thats why I join this place, I dont know jack about this stuff.

Tynee · 10-24-2005, 02:31 PM

Look at the most recent issue of Classic Trucks magazine before you decide to do a swap. They've got an article in their that claims to have gotten 315hp out of a budget 307. Seems like this would be a better way to go than splitting a low mileage engine from a low mileage truck. Just an alternative opinion.

10-21-2005, 04:01 PM	#1
ncblazer72 Registered User Join Date: Oct 2005 Location: North Carolina Posts: 10	Whats The Diffrence In A 307 And A 350 This guy i know has a 1969 blazer..beautiful blazer and is selling it. I am thinking about it but he told me it had a 307. I am guessing 307 is like a 305 to a 350? thanks

10-21-2005, 05:13 PM	#2
cst70rocket Registered User Join Date: Sep 2005 Location: San Angelo or Eufaula Posts: 301	Re: Whats The Diffrence In A 307 And A 350 307 is a 3.875 bore x a 3.25 stroke, picture a 283 with a 327 crank in it. A 350 is a 4.00 bore x a 3.48 stroke. 350 has much more potential, but a 307 will run forever weakly! Kirk

10-21-2005, 06:05 PM	#3
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Whats The Diffrence In A 307 And A 350 Yeah, but look at the bright side, anywhere a 307 is a 350 will swap right in. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

10-23-2005, 01:48 PM	#4
ncblazer72 Registered User Join Date: Oct 2005 Location: North Carolina Posts: 10	Re: Whats The Diffrence In A 307 And A 350 yeah..I have a 72 with a 350 with 65k orginal miles on it. I was thinking about getting this one and swapping engines. Thanks guys

10-23-2005, 08:22 PM	#5
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	Re: Whats The Diffrence In A 307 And A 350 If that 307 has a 3 speed, it probably has a dana 20 transfer case. If you plan on swapping the engine and the transmission out, you'll probably want to swap the t-case too. They are a decent t-case, but not as strong as a 205. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

10-24-2005, 12:33 PM	#6
ncblazer72 Registered User Join Date: Oct 2005 Location: North Carolina Posts: 10	Re: Whats The Diffrence In A 307 And A 350 Thanks for the infor in the swaping idea. Thats why I join this place, I dont know jack about this stuff.

10-24-2005, 02:31 PM	#7
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Re: Whats The Diffrence In A 307 And A 350 Look at the most recent issue of Classic Trucks magazine before you decide to do a swap. They've got an article in their that claims to have gotten 315hp out of a budget 307. Seems like this would be a better way to go than splitting a low mileage engine from a low mileage truck. Just an alternative opinion. __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.



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