How close does you engine fit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**BOSS** · 11-20-2004, 08:40 PM

I just got the 350 goodwrench into my 72 4x4 and was wondering if all of them are that close to the firewall?I mean i have to loosen the dist and turn it just to get the cap on.I dont have a pic right now but are they all that close?I think i got about 8 inches from the fan to the 4 core....lol

Destructo · 11-20-2004, 09:55 PM

on my 85 its not that close, although it is fairly close with an HEI and in-cap coil.

Do the 67-72 chevy trucks have a I6 position that is further back and the v8 position?

**chevy71super** · 11-20-2004, 10:12 PM

On 4X4's the V8's are in the six cylinder position. No one is exactly sure why GM did that but many have guessed that it is either to get the front drive shaft longer (less angle) or to get the weight back further. HEI ignitions will fit, barely. I had to cut the bolt that comes through the firewall which holds up the heater from the inside to get mine to fit. You should have an inch or two of clearance if you are running a non HEI unit.

**BOSS** · 11-20-2004, 10:42 PM

Yeah i am running the hei and it is close.....lol.I just wanted to check and make sure i didnt do something wrong.At least we dont have to worry about the fan hitting the radiator

71swb4x4 · 11-20-2004, 11:38 PM

I have HEI on my 4x4, and there is no way I can get my finger between the dizzie and the firewall. It is very close.

Gator70 · 11-21-2004, 10:46 AM

The HEI that I put in my 70 "almost" touches, I dont think that I could put a 22g wire between the plug wire and the firewall.

82 Silverado 4X · 11-21-2004, 11:21 AM

Just a thought:
I was just thinking that if the rubber in the tranny mount compressed with age, an 1/8" drop at the tranny mount would give you about the same at the dizzy.It might be normal for them to be close but couldn't the tranny mount be raised slightly (shimmed at the frame) to tilt the motor up, which would give the dizzy more clearance?

71swb4x4 · 11-21-2004, 11:25 AM

No tranny mount on a 4x4. Good idea though. It would be a lot of trouble to shim the transfer case, if it's not causing problems being close, I wouldn't mess with it.

**JIMs70GMC** · 11-21-2004, 07:49 PM

Yea the adapter cross member and the transfer case bracket would have to be "adjusted".

687980chevy · 11-25-2004, 02:34 AM

My 68 does rub, just enough to rub the paint off of the firewall with the back 2 plug wire boots(HEI) I have heard of guys taking a hammer to the firewall or even a sawsall!

toddol1971 · 11-28-2004, 10:46 AM

you can put my 71 down as a rubber. Ive thought about going with a reg dstbtr & external coil. Maybe a new poly transfercase mount will be the ticket. I mean you only need a 1/2 inch or so. I'll bet my orig rubber mount is saggy.

67ChevyC10Stepside · 12-02-2004, 10:59 PM

this is in the I6 position....

Mudder · 12-02-2004, 11:47 PM

The poly mounts will raise the TC up some. Just depends how bad you are worn out.

toddol1971 · 12-03-2004, 10:57 AM

Yall keep talking about the inline 6 location, & my 71 only has one set of holes. It has a 350. my plug boots just barely rub. I'm gonna replace the tran mount & see.

gmc71 · 12-14-2004, 10:14 PM

NOT ME. *********
I picked up my current truck in the summer its a 72 3/4 ton camper special, and I have 2 inches to the fire wall with the HEI. It is the only 4x4 i have seen like that. I have 3 friends with 67-72 4x4s and all theres either rub or are close. I am either lucky or somthing is F*&%ed up. Its a great truck.

Budweis · 12-15-2004, 04:01 AM

yeah i know what you mean, i tried to use the edelbrock elite tall valve covers and they rubbed on firewall and was no way they were going on, clearance is a joke when theres so much room under the hood.

MAC67 · 12-16-2004, 05:39 PM

cant see it because of the booster but when i big blocked the blazer i had to do some custom adjustin with the 2 pounder in stratigic places lol ,ahh who cares , the valve covers hide the adjustment locations anyways

*wolfthing2000* · 04-08-2005, 04:44 PM

You all have me curious???? Can you remove the HEI when it is that close to the firewall???? I pulled one ouyt of a 76 truck and it had to be tipped forward just so to remove, and it seemed to have plenty of clearance behind it.
Dave

*72longbed* · 04-08-2005, 06:01 PM

Here's what I'm going to do:
Putting in a 700R4 mated up to my NP205 TC. I'm going to leave the TC crossmember and frame mount in the stock location and work everything forward from there. Meaning the 'adapter' that I will have to use to mate the 700R4 to the NP205 will bring the engine forward and so will the additional length of the tranny itself. I'll end up having to drill new holes in the frame (8) for the engine crossmember only. This will definitely bring the engine away from the firewall by about 3.5 inches I'm told.

Since theres no body on the rolling chassis right now, I figure its the easiest way and best time to do this.

What do you guys think?

72longbed

**402Bowtie** · 04-08-2005, 06:23 PM

72Longbed:
I am very interested to see if everything works out for you. I too have a '72 k20, and am hoping to go with the np205 along with a 700R4 and maybe a fuel injected 350. What are you using for an engine? Be sure to keep us posted on any progress......John

*72longbed* · 04-09-2005, 01:50 PM

John,
I'm going to use my HT383 stroked small block. I'll probably get rid of the belt driven fan and go with an electric unit from Old Air Products.

I'll keep you guys posted with pics off the build-up.

72longbed

71swb4x4 · 04-09-2005, 09:39 PM

72longbed
I am doing the 700r4 swap too. I am using the TH350 adapter, and the tranny is only about 1 3/4" longer. I may just swap in a 2wd fan shroud and run the engine driven fan.

OneBad4x4 · 04-09-2005, 10:15 PM

i just drilled new holes in my body mounts and moved the cab back about an inch.

thats all i did, it was still tight though with a 396

**Yukon Jack** · 04-10-2005, 08:43 AM

Never thought about the option of moving the cab back a little. Interesting.

*72longbed* · 04-10-2005, 08:51 AM

71swb4x4,
are you using an additional adapter between the trans. and the TH350 adapter?? If yes, which one? If no, what did you have to do to your 700R4 to make it mate up to a TH350 adapter??

My estimates on how far forward the engine will move are based on using the TH350 TC and this 'block' adapter that I saw on this Board that allows the 700R4 to mate to the TH350 adapter??

Thanks for your response to this,
72longbed

11-20-2004, 08:40 PM	#1
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	How close does you engine fit? I just got the 350 goodwrench into my 72 4x4 and was wondering if all of them are that close to the firewall?I mean i have to loosen the dist and turn it just to get the cap on.I dont have a pic right now but are they all that close?I think i got about 8 inches from the fan to the 4 core....lol

11-20-2004, 09:55 PM	#2
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	on my 85 its not that close, although it is fairly close with an HEI and in-cap coil. Do the 67-72 chevy trucks have a I6 position that is further back and the v8 position? __________________ 1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.

11-20-2004, 11:38 PM	#5
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	I have HEI on my 4x4, and there is no way I can get my finger between the dizzie and the firewall. It is very close. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-21-2004, 10:46 AM	#6
Gator70 Registered User Join Date: Oct 2004 Location: Turner Valley, Alberta Posts: 91	The HEI that I put in my 70 "almost" touches, I dont think that I could put a 22g wire between the plug wire and the firewall. __________________ 1970 GMC K15 - Canadian built 2nd Owner truck 68k miles 2014 Denali 1500 6.2L

11-21-2004, 11:21 AM	#7
82 Silverado 4X Genuine Chevrolet Join Date: Feb 2003 Location: South West Pennsylvania. Posts: 582	Just a thought: I was just thinking that if the rubber in the tranny mount compressed with age, an 1/8" drop at the tranny mount would give you about the same at the dizzy.It might be normal for them to be close but couldn't the tranny mount be raised slightly (shimmed at the frame) to tilt the motor up, which would give the dizzy more clearance? __________________ George 82 Silverado LWB 4x4 350 SM465 NP208 77 Chevrolet Blazer Chalet 400 TH350 NP203

11-20-2004, 10:12 PM	#3
chevy71super Registered User Join Date: Jan 2002 Location: So Cal Posts: 658	On 4X4's the V8's are in the six cylinder position. No one is exactly sure why GM did that but many have guessed that it is either to get the front drive shaft longer (less angle) or to get the weight back further. HEI ignitions will fit, barely. I had to cut the bolt that comes through the firewall which holds up the heater from the inside to get mine to fit. You should have an inch or two of clearance if you are running a non HEI unit.

11-20-2004, 10:42 PM	#4
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Yeah i am running the hei and it is close.....lol.I just wanted to check and make sure i didnt do something wrong.At least we dont have to worry about the fan hitting the radiator

11-21-2004, 11:25 AM	#8
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	No tranny mount on a 4x4. Good idea though. It would be a lot of trouble to shim the transfer case, if it's not causing problems being close, I wouldn't mess with it. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-21-2004, 07:49 PM	#9
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Yea the adapter cross member and the transfer case bracket would have to be "adjusted". __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

11-25-2004, 02:34 AM	#10
687980chevy Registered User Join Date: Feb 2004 Location: Hilly Southern Indiana! Posts: 201	My 68 does rub, just enough to rub the paint off of the firewall with the back 2 plug wire boots(HEI) I have heard of guys taking a hammer to the firewall or even a sawsall! __________________ 68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28

11-28-2004, 10:46 AM	#11
toddol1971 Registered User Join Date: Nov 2003 Location: plainfield il Posts: 163	you can put my 71 down as a rubber. Ive thought about going with a reg dstbtr & external coil. Maybe a new poly transfercase mount will be the ticket. I mean you only need a 1/2 inch or so. I'll bet my orig rubber mount is saggy. __________________ All my trucks are gone now. I'll gladly take a free one

12-02-2004, 10:59 PM	#12
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	i dont know if it's the same this is in the I6 position.... Attached Images __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

12-02-2004, 11:47 PM	#13
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	The poly mounts will raise the TC up some. Just depends how bad you are worn out.

12-03-2004, 10:57 AM	#14
toddol1971 Registered User Join Date: Nov 2003 Location: plainfield il Posts: 163	Yall keep talking about the inline 6 location, & my 71 only has one set of holes. It has a 350. my plug boots just barely rub. I'm gonna replace the tran mount & see. __________________ All my trucks are gone now. I'll gladly take a free one

12-14-2004, 10:14 PM	#15
gmc71 Registered User Join Date: Aug 2003 Location: Buffalo, NY Posts: 115	NOT ME. ********* I picked up my current truck in the summer its a 72 3/4 ton camper special, and I have 2 inches to the fire wall with the HEI. It is the only 4x4 i have seen like that. I have 3 friends with 67-72 4x4s and all theres either rub or are close. I am either lucky or somthing is F*&%ed up. Its a great truck. __________________ 72 Chevy 4x4 350 55 Chevy Bel Air 350/350 53 Matchless G80s (motorcycle) 06 Trailblazer SS 400hp LS2



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12-15-2004, 04:01 AM	#16
Budweis Geared for Collision Join Date: Jan 2004 Location: St. Louis, Mo. Posts: 683	yeah i know what you mean, i tried to use the edelbrock elite tall valve covers and they rubbed on firewall and was no way they were going on, clearance is a joke when theres so much room under the hood. __________________ MEMBER OF THE 4 WHEEL DISK BRAKE CLUB 1970 C/K20 3/4 Ton 1996 Collectors Edition Corvette 1977 Corvette Coupe

12-16-2004, 05:39 PM	#17
MAC67 " SHOW ME" Join Date: Jan 2003 Location: shelbyville illinois Posts: 2,624	cant see it because of the booster but when i big blocked the blazer i had to do some custom adjustin with the 2 pounder in stratigic places lol ,ahh who cares , the valve covers hide the adjustment locations anyways Attached Images Last edited by MAC67; 12-16-2004 at 05:44 PM.

04-08-2005, 04:44 PM	#18
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	You all have me curious???? Can you remove the HEI when it is that close to the firewall???? I pulled one ouyt of a 76 truck and it had to be tipped forward just so to remove, and it seemed to have plenty of clearance behind it. Dave

04-08-2005, 06:01 PM	#19
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	A Solution?? Here's what I'm going to do: Putting in a 700R4 mated up to my NP205 TC. I'm going to leave the TC crossmember and frame mount in the stock location and work everything forward from there. Meaning the 'adapter' that I will have to use to mate the 700R4 to the NP205 will bring the engine forward and so will the additional length of the tranny itself. I'll end up having to drill new holes in the frame (8) for the engine crossmember only. This will definitely bring the engine away from the firewall by about 3.5 inches I'm told. Since theres no body on the rolling chassis right now, I figure its the easiest way and best time to do this. What do you guys think? 72longbed

04-08-2005, 06:23 PM	#20
402Bowtie Registered User Join Date: Sep 2003 Location: Wichita, KS Posts: 3,735	72Longbed: I am very interested to see if everything works out for you. I too have a '72 k20, and am hoping to go with the np205 along with a 700R4 and maybe a fuel injected 350. What are you using for an engine? Be sure to keep us posted on any progress......John

04-09-2005, 01:50 PM	#21
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	John, I'm going to use my HT383 stroked small block. I'll probably get rid of the belt driven fan and go with an electric unit from Old Air Products. I'll keep you guys posted with pics off the build-up. 72longbed

04-09-2005, 09:39 PM	#22
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	72longbed I am doing the 700r4 swap too. I am using the TH350 adapter, and the tranny is only about 1 3/4" longer. I may just swap in a 2wd fan shroud and run the engine driven fan. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

04-09-2005, 10:15 PM	#23
OneBad4x4 Lifted70BowTie Join Date: Jul 2004 Location: Bakersfield, CA Posts: 204	i just drilled new holes in my body mounts and moved the cab back about an inch. thats all i did, it was still tight though with a 396 __________________ I live in Bakersfield, CA 93308, I use USPS for shipping. (Even tho I've never shipped anything and am currently banned for failure to send out parts.) Please reply to my for sale threads by PMing me. Its hard to keep track of all the threads.

04-10-2005, 08:43 AM	#24
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Never thought about the option of moving the cab back a little. Interesting. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

04-10-2005, 08:51 AM	#25
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	71swb4x4, are you using an additional adapter between the trans. and the TH350 adapter?? If yes, which one? If no, what did you have to do to your 700R4 to make it mate up to a TH350 adapter?? My estimates on how far forward the engine will move are based on using the TH350 TC and this 'block' adapter that I saw on this Board that allows the 700R4 to mate to the TH350 adapter?? Thanks for your response to this, 72longbed

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