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#201 | |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Quote:
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#202 | |
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Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Quote:
Also, forgot to mention, one bolt was smaller than all the rest (5/16") Last edited by Davidf; 05-24-2021 at 12:26 PM. |
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#203 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,042
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
The bolts look like typical 3/8" header bolts. Some times the smaller hex bolts can make install easier in tight spots. I always use 5/16" grade 8 washers on all 3/8" bolts.
I do like the flange nuts if they are the lock type on the under side of the nut. Can't spell serrations? |
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#204 |
Registered User
Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Thanks for providing your feedback. I don't know if those particular bolts are what is specified on the bill of material for those mounting brackets or not as I'm not responsible for their design. I will forward your observation to the individual who did design them though, so corrections can be made if needed.
Thanks |
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#205 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
I finally was able to install my LS into my '71 C10. But, the quality control of the Hooker engine stands needs some improvement. I discovered that one mount was close to the proper width to allow the F-body mount to fit between the ears (after all excess rubber is ground off steel tube. But the other mount had the ears welded 1/8" too close together. Solution was to grind down the engine mount 1/16" off both ends of the metal tube. Took way too much time to get the engine engaged into the mount.
The trans crossmember went together without issue. I had to clearance the frame for the power steering pump, but Trailblazer SS exhaust manifolds fit without issue. A/C compressor fits fine. Stock truck oil pan fits fine with about 1/4" clearance at drag link. Engine is in... [IMG] ![]() [IMG] ![]() Last edited by Davidf; 06-01-2021 at 08:45 AM. |
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#206 |
Registered User
Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Thanks for your report, any and all feedback is appreciated. Can you please tell me which side of the engine mounting brackets was the tighter side. Also, are you using the Holley poly inserts, or some other brand/type of inserts?
Thanks |
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#207 |
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Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Right side was 1/8" too tight or different from left side. I am using the Anchor rubber 3064 clamshell mounts.
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#208 |
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Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Thanks for the clarification. If you are planning to enjoy aggressive throttle stabs with your truck following your swap, be prepared to have to swap out those rubber mounts rather quickly. I’ve seen them last as little a 3 months behind a mild 5.3L LS engine.
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#209 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Uh oh, now I learn that after fighting the install for half a day. No, wont be aggressive but don't want to go back in a short time. Sort of like having to replace the drive shaft center support bearing due to inferior rubber each year...going to go single piece now that I have the opportunity.
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#210 |
Registered User
Join Date: Apr 2014
Location: Union City, CA
Posts: 384
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Anyone able to verify or fit check if there is enough clearance with those LT headers for a rack and pinion shaft to fit through there?
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#211 |
New Member
![]() Join Date: Jan 2021
Location: Riyadh,SA
Posts: 3
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Any update on the 63-67 long tube headers? I can't seem to find the part number on the website or will the one intended for 68-74 part#BH13285 will work with the 63-67 engine stands?
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#212 |
Senior Member
![]() Join Date: Jan 2004
Location: Olathe KS (Greater Kansas City MO Area)
Posts: 2,048
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
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#213 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
No throttle stabs, but I did notice they quickly allowed the engine to settle a bit and cause contact between the oil pan and steering link rod. I went ahead and switched to the urethan mounts while I had the engine out for replacement.
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#214 |
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Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Also, I finally checked driveline angles and removing the spacer from the trans mount made the angles much better. I have a 71 long bed with 5.3L Vortec and 4L60E. Diff is a bit too up, but close. How do you change diff angle on these trucks?
Last edited by Davidf; 08-30-2021 at 09:56 AM. |
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#215 |
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Join Date: Jun 2015
Location: Carlos MN
Posts: 2,042
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Some have changed the diff angle by replacing the stock truck arm cross member mounts with mounts that have a number holes for diff angle adjustments.
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#216 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Finally got the driveline angles sorted. Reminder: C10 longbed, stock ride height, single piece driveshaft, 5.3L LS, 4L60e, Blackheart engine stands and crossmember Installed 4 degree shims to lower/reduce (down) pinion angle. Reinstalled/used shim that came with the trans cross member. Engine and pinion angle are exactly equal. Driveshaft working angle is 0.9 degrees at both ends. Engine angle is about 3.3 degrees.
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#217 | |
New Member
![]() Join Date: Jan 2021
Location: Riyadh,SA
Posts: 3
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Quote:
honestly, I don't blame him they must be overwhelmed with the current market. hopefully, we'll get an update soon. |
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#218 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Well a little feed back. I have been chasing driveline vibration and just a uncomfortable ride for a few years. After watching the shifter rattling over bumps I decided time for rubber mounts. WHAT A DIFFERENCE! The suburban drives like a dream now rides better even the exhaust sounds better. Save the poly engine mounts for a race vehicle. Absolutely terrible on the street.
The poly mount had started to melt slightly from the heat. I am using stock 2010 camaro manifolds with heat shields.
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#219 |
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Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Well, interesting. I have not driveline vibrations that I can contribute the Hooker's poly engine mounts. I started with rubber and could tell no difference when switching to poly. My only remaining vibration starts at about 65mph and is attributable to a worn out rear axle that will be rebuilt in the near future.
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#220 |
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Join Date: Mar 2011
Location: tulsa,ok.
Posts: 1,803
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
On the 3” exhaust! What is the offset on the h pipe piece? I Have the blackheart kit but thinking when I switch from a 4l60 to a 4l80 that the h pipe will be in the way of the transmission crossmember! Truck is at the shop and won’t have it back til the end of the month, I’m thinking that I need to replace the whole h pipe section
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#221 |
Registered User
Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
If you are using the Hooker Blackheart engine mounting brackets and transmission crossmember, you won’t have any issues making the change to a 4L80 transmission. The exhaust crossover tube will sit about 1/2” behind the transmission crossmember in that installation. Post #42 in this thread depicts that fairly clearly.
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#222 | |
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Join Date: Mar 2011
Location: tulsa,ok.
Posts: 1,803
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Quote:
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#223 | |
Registered User
Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Quote:
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#224 |
Registered User
Join Date: Jul 2015
Location: Bowling Green, KY
Posts: 264
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
Hey guys, just dropping in to make a final post in this thread. I am no longer working for Holley and so will no longer be updating this thread, or any other I have posted in the past. I am a GM truck guy myself, so I will remain an active member here.
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#225 |
Registered User
Join Date: Nov 2014
Location: Syracuse
Posts: 31
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
For those who have installed the kit, does the taller extension pipe between the H pipe and muffler go on the driver or passenger side? The instructions say there is a notch on the drivers side extension, but I don't see it.
Thanks! Eddy |
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