Engine opinion You know how it goes........ - The 1947 - Present Chevrolet & GMC Truck Message Board Network

8door · 04-23-2005, 04:50 PM

Here I am working on my 68. Was going to replace the wood bed and paint the truck and drive it. Now I have installed a later power steering unit and have the front wheel wells out to look for rust ( there is none)and all the chrome etc stripped.
Looking to do Vintage air so pulled old heater motor and stuff.Radiator out.Get new wiring and on and on. Well you know how it goes.....

Got boxes full of baggies with nuts bolts screws etc labeled of course.
Sitting here looking at the engine. Not original it's a mid 70's 350 with Qjet coupled to a th400.
I'm this far maybe I should pull engine and rebuild it.
The 68s came with 327 not 350. What do you guys think of going back to a 327? Do they have about the same horsepower specs and what about economy,a 2 barrel carb as compared to 4 barrels.?
I guess what I'm asking , is there much difference between the two?
Are 327s available?

purple gas · 04-23-2005, 05:23 PM

327 compared to 350's? It depends on more than cubic inches. That's why Boss Mustangs & Camaro's were so hot with 302's in the late 60's / early '70s, I do know that lots of people who should know say a 4 barrel will give better fuel economey than a 2 barrel IF you keep your foot out of it. I guess it depends on what exactly your gonna use the truck for. Do you NEED more power, or do you WANT more power. I know an engine builder who's drag race car had a straight 6. Why? Just to prove he could make anything go fast. Boils down to how much do you wanna spend.

Longhorn Man · 04-23-2005, 05:36 PM

I'd stick with the 350 myself. If you want a smaller engine for better MPG....it'll take many many miles of 1 or 2 MPG better, to pay for a new engine.

Johnny05 · 04-23-2005, 06:14 PM

Either way would be good.. I like 327's and the 350's... If you go with a 327 make sure it's a large journal version. Just in case you want to combine them and build a 302!

As far as mileage goes... there's not much difference but 4bbl's makes it more fun.. you know.. for "emergencies"

..........

8door · 04-23-2005, 07:15 PM

It's really staying stock. More power is not my goal, just want a nice driver and haul light items or maybe a light weight trailer 2000lbs.
When I was a contractor I had a 69 GMC with a six and tree speed . That was a work horse and did all I asked of it ( kinda wish I still had it)
Chris

draino76 · 04-23-2005, 08:47 PM

Quote:

Originally Posted by Johnny05

Either way would be good.. I like 327's and the 350's... If you go with a 327 make sure it's a large journal version. Just in case you want to combine them and build a 302!

As far as mileage goes... there's not much difference but 4bbl's makes it more fun.. you know.. for "emergencies"

..........

FYI You need to use a small journal 327 block and 283 crank to make a 302.

262- 3.10" stroke 2.45" main all 3.671" bore
265- 3.00" stroke 2.30" main all 3.75" bore
267- 3.48" stroke 2.45" main all 3.50" bore
283- 3.00" stroke 2.30" main all 3.875" bore
302- 3.00" stroke 2.30" main in 67 2.45" in 68-69 4.00" bore
305- 3.48" stroke 2.45" main all 3.736" bore
307- 3.25" stroke 2.45" main all 3.875" bore
327- 3.25" stroke 2.30" main in 65-67 2.45" in 68-69 4.00" bore
350- 3.48" stroke 2.45" main all 4.00" bore
400- 3.75" stroke 2.65" main all 4.125" bore

gotta love chevy the possibilities are endless!!!!!

Cethern · 04-23-2005, 08:55 PM

From the outside 350 looks like a 327 you could use a older intake one with the oil fill on the front. But I would stay with a 350.
As for a 2bbl/4bbl
My 71 3/4 4x4 has a 350/350 3.73 and a 2bbl and gets maybe 11mpg My 72 K5 400/350 3.73 my 72 with a Q-jet get way better mpg...Now the 72 does weigh less but I have my size 9 in it a little harder...

8door · 04-23-2005, 10:11 PM

So the stroke of the 350 is about 1/4" longer than the 68-69 327, giving it more torque with the same 4.00" bore.
Thanks for specs draino76. That's what I was looking for.
This info helps me.I'll keep the 350 untill it needs rebuilidng. Then I'll keep the 350 and rebuild it.
I think I said that already.............................
Chris

04-23-2005, 04:50 PM	#1
8door Not too old to learn Join Date: Mar 2004 Location: SoCal Posts: 617	Engine opinion You know how it goes........ Here I am working on my 68. Was going to replace the wood bed and paint the truck and drive it. Now I have installed a later power steering unit and have the front wheel wells out to look for rust ( there is none)and all the chrome etc stripped. Looking to do Vintage air so pulled old heater motor and stuff.Radiator out.Get new wiring and on and on. Well you know how it goes..... Got boxes full of baggies with nuts bolts screws etc labeled of course. Sitting here looking at the engine. Not original it's a mid 70's 350 with Qjet coupled to a th400. I'm this far maybe I should pull engine and rebuild it. The 68s came with 327 not 350. What do you guys think of going back to a 327? Do they have about the same horsepower specs and what about economy,a 2 barrel carb as compared to 4 barrels.? I guess what I'm asking , is there much difference between the two? Are 327s available? __________________ 1968 C10 a way to long restoration.

04-23-2005, 05:23 PM	#2
purple gas Registered User Join Date: Oct 2004 Location: saskatoon, planet earth Posts: 680	327 compared to 350's? It depends on more than cubic inches. That's why Boss Mustangs & Camaro's were so hot with 302's in the late 60's / early '70s, I do know that lots of people who should know say a 4 barrel will give better fuel economey than a 2 barrel IF you keep your foot out of it. I guess it depends on what exactly your gonna use the truck for. Do you NEED more power, or do you WANT more power. I know an engine builder who's drag race car had a straight 6. Why? Just to prove he could make anything go fast. Boils down to how much do you wanna spend. __________________ I got a bench seat baby, you don't have to sit over there.

04-23-2005, 07:15 PM	#5
8door Not too old to learn Join Date: Mar 2004 Location: SoCal Posts: 617	It's really staying stock. More power is not my goal, just want a nice driver and haul light items or maybe a light weight trailer 2000lbs. When I was a contractor I had a 69 GMC with a six and tree speed . That was a work horse and did all I asked of it ( kinda wish I still had it) Chris __________________ 1968 C10 a way to long restoration.

04-23-2005, 08:55 PM	#7
Cethern What was I thinking?? Join Date: Dec 2003 Location: Commerce City Co Posts: 637	From the outside 350 looks like a 327 you could use a older intake one with the oil fill on the front. But I would stay with a 350. As for a 2bbl/4bbl My 71 3/4 4x4 has a 350/350 3.73 and a 2bbl and gets maybe 11mpg My 72 K5 400/350 3.73 my 72 with a Q-jet get way better mpg...Now the 72 does weigh less but I have my size 9 in it a little harder... __________________ 72 K5 that needs lots of parts.. 71 GMC 3/4 4x4 That doesn't need much which is a good thing I don't think I could aford another money pit...

04-23-2005, 10:11 PM	#8
8door Not too old to learn Join Date: Mar 2004 Location: SoCal Posts: 617	So the stroke of the 350 is about 1/4" longer than the 68-69 327, giving it more torque with the same 4.00" bore. Thanks for specs draino76. That's what I was looking for. This info helps me.I'll keep the 350 untill it needs rebuilidng. Then I'll keep the 350 and rebuild it. I think I said that already............................. Chris __________________ 1968 C10 a way to long restoration.

04-23-2005, 05:36 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I'd stick with the 350 myself. If you want a smaller engine for better MPG....it'll take many many miles of 1 or 2 MPG better, to pay for a new engine.

04-23-2005, 06:14 PM	#4
Johnny05 Registered User Join Date: Oct 2004 Location: Austin, Texas Posts: 73	Either way would be good.. I like 327's and the 350's... If you go with a 327 make sure it's a large journal version. Just in case you want to combine them and build a 302! As far as mileage goes... there's not much difference but 4bbl's makes it more fun.. you know.. for "emergencies" ..........



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