68 gmc engine perch location - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bb400ho** · 09-20-2018, 12:57 PM

hello, i need a little help. i tried to search but i get conflicting info. i have a 68 gmc short bed 2wd. i think it came with a 307 and a turbo 400. (according to a hard written receipt from the dealer) it had no engine when i got it and the frame was already sandblasted and painted. the engine perches are mounted in the 2 rear holes ( closest to the cab) i thought that the v-8's were in the front holes. if i try to move them to the forward holes they don't fit right and the bottom hole doesn't line up. are there different perches for the front holes?

thanks Bryan

**RodnRudy** · 09-20-2018, 01:02 PM

The engine perches for the V8's are different than ones for the sixes. I suspect you have 6 cyl perches that won't fit in the front location. Check in the parts for sale section, the V8 perches come up for sale onc in a while.

**bb400ho** · 09-20-2018, 01:06 PM

thanks ill look

**'68OrangeSunshine** · 09-20-2018, 08:53 PM

Check the SPID.
CS = 2WD L6
CM = " V6
CE = " V8
If the SPID doesn't list displacement as a 327 or 350 V8, then it was a 307. Or a 250 if it was an L6 truck.

**bb400ho** · 09-21-2018, 08:46 AM

my truck does not have a SPID i thought it was just gone but when i was looking for some info here i saw that some gmc's didn't have one. the vin is CE
the mounts are in the rear holes. I'm putting in a 5.3 vortec. even with the dirty dingo sliders all the way forward there is only about a 1/4 inch clearance at the rear of the valve covers. is it possible that the 307 mounts or a turbo 400 trans would have mounts in the rear holes?
thanks Bryan

Redneck Rydes · 09-21-2018, 08:57 AM

Usually when a V8 engine was mounted in these trucks rear holes were for standard trans and front holes were for automatic trans.

09-20-2018, 12:57 PM	#1
bb400ho Active Member Join Date: Jun 2017 Location: erie pa Posts: 150	68 gmc engine perch location hello, i need a little help. i tried to search but i get conflicting info. i have a 68 gmc short bed 2wd. i think it came with a 307 and a turbo 400. (according to a hard written receipt from the dealer) it had no engine when i got it and the frame was already sandblasted and painted. the engine perches are mounted in the 2 rear holes ( closest to the cab) i thought that the v-8's were in the front holes. if i try to move them to the forward holes they don't fit right and the bottom hole doesn't line up. are there different perches for the front holes? thanks Bryan

09-20-2018, 01:02 PM	#2
RodnRudy Senior Member Join Date: Oct 2014 Location: New Palestine In Posts: 932	Re: 68 gmc engine perch location The engine perches for the V8's are different than ones for the sixes. I suspect you have 6 cyl perches that won't fit in the front location. Check in the parts for sale section, the V8 perches come up for sale onc in a while. __________________ Phil "Money is only a tool to create and achieve what you want most in life" PayPal: rodnrudy@comcast.net

09-20-2018, 01:06 PM	#3
bb400ho Active Member Join Date: Jun 2017 Location: erie pa Posts: 150	Re: 68 gmc engine perch location thanks ill look

09-20-2018, 08:53 PM	#4
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,500	Re: 68 gmc engine perch location Check the SPID. CS = 2WD L6 CM = " V6 CE = " V8 If the SPID doesn't list displacement as a 327 or 350 V8, then it was a 307. Or a 250 if it was an L6 truck. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

09-21-2018, 08:46 AM	#5
bb400ho Active Member Join Date: Jun 2017 Location: erie pa Posts: 150	Re: 68 gmc engine perch location my truck does not have a SPID i thought it was just gone but when i was looking for some info here i saw that some gmc's didn't have one. the vin is CE the mounts are in the rear holes. I'm putting in a 5.3 vortec. even with the dirty dingo sliders all the way forward there is only about a 1/4 inch clearance at the rear of the valve covers. is it possible that the 307 mounts or a turbo 400 trans would have mounts in the rear holes? thanks Bryan

09-21-2018, 08:57 AM	#6
Redneck Rydes Registered User Join Date: Feb 2016 Location: Trenton,Ontario & South Carolina Posts: 755	Re: 68 gmc engine perch location Usually when a V8 engine was mounted in these trucks rear holes were for standard trans and front holes were for automatic trans.



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