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#1 |
Registered User
Join Date: Mar 2007
Location: Connecticut
Posts: 581
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Motor mount position for HEI clearance
OK guys, question for ya's
Our 71 K10 came original with a 6 cylinder and the SM465 4 spd and NP205 the PO changed it out to a 283... We have put in a 350 and are still using the SM465/NP205. The cab is off the frame now for a frame up resto. My question is, should the motor mount towers be in the front set of holes or the rear holes to have clearence for an HEI distributor with a 350? It is currently installed in the rear holes (no cab yet, remember) and I have about 6" +/- from the clutch fan we used and the radiator. I do not have a shroud for it yet to check clearance. The rear tranny cross member is bolted in along with the transfer case torsion mount, so I think I am OK. But I remember reading somewhere about HEI clearance issues with the firewall, maybe here, dont remember. sorry for the book version, never could keep things simple ![]() Can anyone clear this up? thanks, chas
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"I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van |
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,859
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Re: Motor mount position for HEI clearance
I am pretty sure all the 4WDs were mounted in the rear holes, 6 or 8.
I mounted my 2wd in the back set and I have plenty of room for the factory HEI. Not a whole lot extra mind you, but plenty of room none the less.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 11-28-2008 at 08:52 PM. |
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#3 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: Motor mount position for HEI clearance
my V8's mounts are in the rear holes and my dizzy is tight to work on... but there's just enough room.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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#4 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Motor mount position for HEI clearance
From what I know.....
The 250 6cyl is mounted on the back two mounts. The bigger 6cyl(I think the 292) is mounted one motor mount rear and one on the front holes. When I bought my truck it was a 6cyl but had been converted to a V8 and they used the original 250 mount holes and the motor is WAY towards the back. It works but it is a giant pain in the ass to mess with the distributor. Also the bell housing bolts are almost impossible to get to. I would strongly suggest setting your motor on the front mounts in any V8 situation. However, the only good point to having your V8 set back on the rear mount holes is that you have a better weight transfer in as far as a drag race setup goes. |
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#5 |
Registered User
Join Date: Mar 2007
Location: Connecticut
Posts: 581
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Re: Motor mount position for HEI clearance
Thanks guys, now that I think about it, Im not sure if I can change it because its a 4x4 with a transfer case.
chas
__________________
"I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van |
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#6 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Motor mount position for HEI clearance
Quote:
Longer radiator shroud, transmission cooler lines, longer power steering hoses & your drive shafts will be shorter. And probably a few more things that I didn't mention as well. s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#7 |
They call me the Breeze...
![]() Join Date: Jul 2007
Location: New York
Posts: 2,251
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Re: Motor mount position for HEI clearance
That may work ok with a 2wd, but not a 4wd like he is running. The gains made for HEI clearance will be quickly nullified by driveshaft issues among other things.
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Mike 69 K20 "Beer is proof God loves us and wants us to be happy"....Ben Franklin |
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#8 | |
They call me the Breeze...
![]() Join Date: Jul 2007
Location: New York
Posts: 2,251
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Re: Motor mount position for HEI clearance
Quote:
I don't recommend moving it forward to try and gain clearance for an HEI. Mount it where it should be, the HEI will be a tight fit, but it will fit. Both of mine have sat tight to the firewall.
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Mike 69 K20 "Beer is proof God loves us and wants us to be happy"....Ben Franklin |
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