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04-08-2021, 08:48 AM | #1 |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
I can confirm that the components within the different Hooker Blackheart exhaust systems are the same with the exception of the tips themselves and the rear hanger brackets.
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04-16-2021, 08:32 PM | #2 | |
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04-17-2021, 09:23 AM | #3 |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
There is a new set of headers working its way through the release process that was specifically designed for the narrower frame rails of the 1963-67 C10 trucks. The design of those headers came about from discovering that the headers designed for the 1968-72 C10's wouldn't fit the earlier frame. That wasn't one of my personal projects, so I don't know when its release is scheduled for. Since you are installing a 2.5" exhaust system, you will need to perform some form of adapting to get it to connect to the long-tube headers since the collectors on them have 3" outlets.
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04-12-2021, 10:45 AM | #4 | |
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05-19-2021, 06:50 AM | #5 |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
So an update! Had to cancel my order bh13194 cause it got pushed to sept 20th! Ordered kit bh13193, which is a 3” exhaust kit! shows up at my house 4 days later missing parts, all the hardware: brackets, bolts, insulators, clamps, even instructions all missing! I got 8 exhaust pipe pieces, and 2 mufflers that’s it!
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05-19-2021, 05:05 PM | #6 | |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
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05-20-2021, 09:08 AM | #7 |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
I received my Blackheart engine stands and cross member yesterday...this weekend, pull out the old tired 350 (71 lwb) hopefully dropping in the LM7/4L60E. A little worried that the truck oil pan won't clear, but some say it does. Fingers crossed.
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05-20-2021, 03:04 PM | #8 | |
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05-23-2021, 11:01 PM | #9 |
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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? |
05-24-2021, 08:51 AM | #10 |
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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.
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06-01-2021, 08:35 AM | #11 |
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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] [IMG][/IMG] Last edited by Davidf; 06-01-2021 at 08:45 AM. |
06-01-2021, 03:22 PM | #12 |
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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?
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06-01-2021, 03:57 PM | #13 |
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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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06-01-2021, 04:19 PM | #14 |
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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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06-01-2021, 04:55 PM | #15 |
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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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08-20-2021, 04:51 PM | #16 |
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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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08-29-2021, 03:15 PM | #17 |
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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. |
06-29-2021, 08:48 PM | #18 |
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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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07-19-2021, 05:42 PM | #19 |
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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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08-20-2021, 07:04 AM | #20 |
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Re: Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread
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10-13-2021, 04:57 PM | #21 | |
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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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08-29-2021, 04:52 PM | #22 |
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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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09-11-2021, 01:29 PM | #23 |
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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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06-16-2022, 10:46 PM | #24 |
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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.
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06-17-2022, 12:16 PM | #25 |
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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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