![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
HEI hitting firewall???
Alright everyone Im back with more questions. I finally got the 327 stuffed in between the frame rails but now I seem to have a new issue. The 327 I got has a HEI on it and with the engine sitting in its place the very top back of the wires and cap are all the way against the firewall so should I be looking to pull the HEI out and put a low profile ignition in its place or what? I would like to keep the HEI but dont want to damage anything. What do you all think? If it helps Ill try to post some pics tommarrow.
Thanks Tim ![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
|
Re: HEI hitting firewall???
use hammer make clearance
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
![]() |
![]() |
![]() |
#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: HEI hitting firewall???
You could move the engine up to where it should be, but I hear there is a way to turn the HEI to where it won't hit.
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Jun 2003
Location: Linden, North Carolina
Posts: 617
|
Re: HEI hitting firewall???
I think when you use the 6 cyl mounts with v8 you'll have dist fit problems. I know I did. I used a hammer to gain some clearance, but it's hard to make look nice with the engine in. I'm running a Mallory comp9000 now and it's even larger than an HEI.. You can get a small diameter dist from MSD/Mallory.
__________________
64 Panel Rebuild Pics Clutch Replacement and Borg Warner T10 Trans Rebuild 64 Panel 1/2 Ton 350cubes/400hp BorgWarner t-10 3:73 Auburn Posi |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
Ok so I take it the V-8's do mount further forward then the inline 6 did? problem is it seems if I did move the engine forward the trans wouldnt sit on its mounts right anymore.
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
Also if I do move it forward do I need to get different tower mounts?
|
![]() |
![]() |
![]() |
#7 |
18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
|
Re: HEI hitting firewall???
What trans are you running, If its the 3 on the tree you cant move it, its rivited to the frame and its not worth it. If its a automatic get the small block towers and slide the engine and trans ahead and all the bolt holes should line up
__________________
2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... ![]() |
![]() |
![]() |
![]() |
#8 |
Registered User
![]() Join Date: Jan 2001
Location: Jackson, New Jersey
Posts: 1,560
|
Re: HEI hitting firewall???
yes, you would need v8 mounts im not sure about the trans but i am curious my self
__________________
2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER) Last edited by jc; 03-17-2006 at 07:58 PM. |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
It was a 3 on the tree but its not riveted in it was bolted to the crossmember. The bolt holes line up right now but can the engine be run there or should it be moved forward?
|
![]() |
![]() |
![]() |
#10 |
Registered User
![]() Join Date: Jan 2001
Location: Jackson, New Jersey
Posts: 1,560
|
Re: HEI hitting firewall???
he meant the cross member is rivited to the frame
__________________
2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER) |
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
yeah I thought so I was goina go look but its dark now so Ill have to wait til tommarrow. The only other thing buggin me now is if I do move the motor forward and I cant use the tranny I have then I can get my hands on a saginaw 3 speed but will my drive shaft still fit or will I need to get it lengthened or shortened? Hope Im not buggin anyone you guys have been a great help to me.
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
I also cant seem to find small block engine to frame mounts every place Ive checked has the inline 6 or the big block ones no sbc....
|
![]() |
![]() |
![]() |
#13 |
Registered User
![]() Join Date: Jan 2001
Location: Jackson, New Jersey
Posts: 1,560
|
Re: HEI hitting firewall???
check with teeitup or biskquik or burnsman on the parts board for the
towers there pretty inexpensive
__________________
2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER) |
![]() |
![]() |
![]() |
#14 |
Registered User
Join Date: Jun 2003
Location: Linden, North Carolina
Posts: 617
|
Re: HEI hitting firewall???
It is easier to just modify the firewall for HEI. Since it is a stick, changing the mounts/clutch setup/diff driveshaft don't justify the move. Lots of people run them with 6 cyl mounts.
On that note, on my '64 I used tall Edelbrock valve covers and they hit horribly bad. I didn't find out until I had everything done and ready to fire it up(used stockers for mock up). I ended up modifying the firewall for clearance, since I had everything else done already.
__________________
64 Panel Rebuild Pics Clutch Replacement and Borg Warner T10 Trans Rebuild 64 Panel 1/2 Ton 350cubes/400hp BorgWarner t-10 3:73 Auburn Posi |
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Mar 2005
Location: waco tx
Posts: 584
|
Re: HEI hitting firewall???
I've done this before knock the rivits on the mount out and move it up the holes are there.Evey thing will line up I did this on my dads 67 back in 72.You will have to use the V8 towers.
__________________
77 swb starting all over again. Last edited by boogie67; 03-17-2006 at 10:09 PM. |
![]() |
![]() |
![]() |
#16 |
Registered User
![]() Join Date: Jan 2006
Location: Texas
Posts: 53
|
Re: HEI hitting firewall???
Am having the same problem, my HEI is like 1/2 an inch from the firewall, and i have a 350/350 Auto but if i move the hole engine and trans then i will also need another drive shaft, so i just left the engine the way it is, it good for me. am guessing that that happend because the chassi was for a 6L, i would recommend you to cut a little pice if the firewall and then weld in some thing to cover the hole.
|
![]() |
![]() |
![]() |
#17 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
|
Re: HEI hitting firewall???
Another thing to check is the rubber cab mounts, especially the front ones. If the mounts are sagging, new ones will give you more clearance near the HEI.
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
![]() |
![]() |
![]() |
#18 |
Senior Member
![]() Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,720
|
Re: HEI hitting firewall???
Green Machine has answered with what is most likely your problem as I've done a dozen or more 6cyl to V8 swaps putting the V8 in the original 6cyl. mounting position and if your cab mounts are good you should have approx. 1" clearance between the distributor cap plug wires & firewall.
GMCPaul |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Mar 2006
Location: Bountiful, Utah
Posts: 9
|
Re: HEI hitting firewall???
I have the same problem and also will correct it by working the firewall slightly with a hammer. I suggest marking the area where the two or three wires make contact with the firewall. With the cap removed, you will know exactly where to create more clearance. I am also going to take Green Machine's suggestion and check the cab mounts. I don't want to consider relocating the engine because I have the transfer case to also deal with.
__________________
72 Money Pit 1972 Cheyenne K20, crate 290 hp 350, GM HEI, 4 spd, 4:10 w/Detroit Locker in corporate 14-bolt [SIZE="3"]Twice as much invested in it as I could ever hope to get out of it, and still spending![/SIZE] ![]() |
![]() |
![]() |
![]() |
#20 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
|
Re: HEI hitting firewall???
BTW - 4wd models all used the "6 cylinder" position whether they were a SB or 6 banger, they were all installed in the rear position.
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
![]() |
![]() |
![]() |
#21 |
Senior Member
Join Date: Nov 2005
Location: Queen Creek, AZ
Posts: 218
|
Re: HEI hitting firewall???
mechdawg... check this post, I asked the same thing... you can see where the PO had the motor mounted, it was a v8. The truck was originally a v6
http://67-72chevytrucks.com/vboard/s...d.php?t=192765
__________________
'67/70 Chevy C/10 '10 2500 Crewcab Duramax 4wd Last edited by redneckdds; 03-18-2006 at 02:32 AM. Reason: wanted to add link with pic |
![]() |
![]() |
![]() |
#22 |
Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
|
Re: HEI hitting firewall???
I have a V-8 in the 6 hole w/HEI and enough clearance. No firewall hammering here. Listen to GMC Paul and GreenMachine...your cab mounts should be checked and the spacer washers for the front of the cab.
__________________
'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
![]() |
![]() |
![]() |
#23 |
Active Member
![]() Join Date: Dec 2004
Location: Tucson, AZ
Posts: 233
|
Re: HEI hitting firewall???
I put a one inch body lift on my Trazer I'm building and have all kinds of room now. It was hitting before. Definitely check front cab mounts. Rick
|
![]() |
![]() |
![]() |
#24 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
|
![]() |
![]() |
![]() |
#25 |
Registered User
Join Date: Jul 2002
Location: Dover AFB Delaware
Posts: 159
|
Re: HEI hitting firewall???
Ok I went out there and measured my front body mount pucks measure right at 1 inch thick. Is this correct? Or did I end up with the wrong set. Can anyone out there give me the correct thickness for the front and rear pucks?
Once again its a 67 2wd short wheel base. Thanks again guys. |
![]() |
![]() |
![]() |
Bookmarks |
|
|