Hooker Blackheart 1967-72 C10 Truck LS/LT Swap System Info Thread

[Daaaanz67]

Will this also work for long beds with two piece shafts?

[toddoky]

Originally Posted by Daaaanz67

Will this also work for long beds with two piece shafts?

Everything in the system will except for the exhaust systems, which would take some modifications to account for the longer wheelbase.
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[72MARIO]

Originally Posted by toddoky

Everything in the system will except for the exhaust systems, which would take some modifications to account for the longer wheelbase.
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Do you plan on making a exhaust system for the lwb and suburban chassis ? The only diffirence is 12" under the cab and 8" behind the wheels. I am glad this was mentioned as the part number does not specify lwb or swb simply c 10 trucks.

[toddoky]

Originally Posted by 72MARIO

Do you plan on making a exhaust system for the lwb and suburban chassis ? The only diffirence is 12" under the cab and 8" behind the wheels. I am glad this was mentioned as the part number does not specify lwb or swb simply c 10 trucks.

Thanks for pointing out the lack of clarity on the product descriptions; I’ll notify the product manager and get it taken care of. As far as for bolt-on coverage of the long wheelbase trucks themselves, I don’t see anything happening in that regard as they were ignored in the Squarebody C10 application, so I see the same thing happening here. I adapted one of those systems to my 1979 C20 rather easily and I’m sure others will do the same with long beds in this application.
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[Bullockchevy]

Just to confirm this is the correct part number for installing a 6L80E in my 69 C10? The website indicated it was only for the T56 transmission.

71222024HKR

I just recently purchased a 2010 Camaro SS and going to start the process of stripping it down to be the donor car for my '69 Step-side. I want to reuse as much of this car as possible and it looks like this LS swap system is the direction I want to go to bolt it in. Just not sure if I can keep the Camaro oil pan or if I need to buy the Holley 302-2 or 302-3 while I'm at it.

Thanks,
Trent

[Jason Banks]

I'm glad EddyC brought this back up to the top. I didn't see this thread when it was started.

Just yesterday I discovered the engine mounts I got from another source didn't line up very well with my frame and crossmember. I also discovered their trans crossmember is tight up to the inside of the frame on both sides, which doesn't leave room to run wiring and brake/fuel lines inside the frame.

I really like the design of these engine mounts since they mount in the holes that are further back on the top of the frame and the back hole on the crossmember. Not sure why other designs mount forward and then cantilever back.

Looks like if I order today I can pick them both up at Summit in Arlington on the 7th.

[the ideaman]

We just finished installing this 2.5" side exit exhaust on my 67. The exhaust hit my trans crossmember and crossover hit the tailshaft, so a couple mods were necessary for us. We couldn't have built an exhaust system from stainless steel for less than this Holley system.

[EddyC]

Originally Posted by the ideaman

We just finished installing this 2.5" side exit exhaust on my 67. The exhaust hit my trans crossmember and crossover hit the tailshaft, so a couple mods were necessary for us. We couldn't have built an exhaust system from stainless steel for less than this Holley system.

Thanks for the info. Are you running the ECE trans and trailing arm ctossmembers?

[the ideaman]

Originally Posted by EddyC

Thanks for the info. Are you running the ECE trans and trailing arm ctossmembers?

We started with the ECE crossmember and only wound up using the mounting points. The exhaust hit the crossmember. I've got a stock crossmember with 4" holes for the exhaust and it's boxed in.

[EddyC]

Thanks again for the info. I will take a few more measurements this weekend, but I think the 2.5 inch exhaust will work with the ECE dropmember. I slid under the truck and took a quick measurement. The exhaust holes have a 3.25 diameter and the center to center measurement is 22 inches. I will take a closer look on Saturday.

Eddy

[the ideaman]

Look at the pdf of the holley instructions. I believe the holes in the crossmember have to be 5.5" from the frame rail. The exhaust ran right into the trans crossmember. We modified it to mimic the new holley trans crossmember.

[Jason Banks]

I have a question about which Holley pan will be even with or above the engine crossmember? 302-2 or 302-3 ... what would be the main differences in the pans?

I also notice the recommended bolt kit for the engine mounts 71223015HKR says they are 150mm long and the recommended bolts according to the instructions are 140mm long. which is correct?

[EddyC]

Does anyone have a sound clip of this system installed? It would be cool to hear the difference between the 2.5 a 3 inch system. I planned to go with the Borla ProXS, but I'm trying to keep an open mind.

[EddyC]

Double post

[the ideaman]

https://www.instagram.com/p/B6TleT4J...h9wGUiFRqnsc0/

[EddyC]

Originally Posted by the ideaman

https://www.instagram.com/p/B6TleT4J...h9wGUiFRqnsc0/

Sounds great!

[derotoreut]

I wish they had this system for the SWB K10 4WD. I'd be all over it.

[Jason Banks]

Sure would be nice if the instructions:
https://documents.holley.com/199r11655.pdf


Listed the part number for the spacers for the different transmissions. It was by dumb luck that I discovered the 11/16 spacer for the 4L60 is PN 71223012HKR. I figured they might be included with the crossmember. But, for $30+ I'll be machining my own spacer.

[toddoky]

Originally Posted by Jason Banks

Sure would be nice if the instructions:
https://documents.holley.com/199r11655.pdf


Listed the part number for the spacers for the different transmissions. It was by dumb luck that I discovered the 11/16 spacer for the 4L60 is PN 71223012HKR. I figured they might be included with the crossmember. But, for $30+ I'll be machining my own spacer.

The part number listings for the crossmembers are currently incomplete and only the base crossmember as used for the T56 is listed. Other crossmember part numbers will be getting released that include the spacers for specific transmissions in them, which is why the instruction sheet reads "Depending on which crossmember you order, there will be a supplied spacer for your specific transmission". I know it is slightly confusing at this time for those of you on the user end of things as the final complete system landscape is not yet visible. If you can machine the spacer yourself and save the $30+, I think that's great.

[Jason Banks]

Hey Todd I asked these questions in post 71
-----------
I have a question about which Holley pan will be even with or above the engine crossmember? 302-2 or 302-3 ... what would be the main differences in the pans?

I also notice the recommended bolt kit for the engine mounts 71223015HKR says they are 150mm long and the recommended bolts according to the instructions are 140mm long. which is correct?
---------------

I think I have figured out the pans, but what gives with the 10mm difference in bolt length?

[toddoky]

Originally Posted by Jason Banks

Hey Todd I asked these questions in post 71
-----------
I have a question about which Holley pan will be even with or above the engine crossmember? 302-2 or 302-3 ... what would be the main differences in the pans?

I also notice the recommended bolt kit for the engine mounts 71223015HKR says they are 150mm long and the recommended bolts according to the instructions are 140mm long. which is correct?
---------------

I think I have figured out the pans, but what gives with the 10mm difference in bolt length?

I had to read the product listing on the Holley website to see what you were referring to. The140mm call-out is something that was carried over from previous applications that were listed before the Hooker Blackheart bolt kit existed. Errors and/or inclusions like this happen sometimes from miscommunication between the engineering and marketing departments. You can consider 140mm the minimum length you would need if you were buying the bolts through another supplier.
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[Spun Bearing]

toddoky

I see that it was briefly touched on, but will the mounts and transmission crossmember work on a '64 shortbed? I understand maybe the header and exhaust layout might be different.
If unsure - would it be possible that I purchase the mounts and crossmember and if it doesn't work return for a refund?

[toddoky]

Originally Posted by Spun Bearing

toddoky

I see that it was briefly touched on, but will the mounts and transmission crossmember work on a '64 shortbed? I understand maybe the header and exhaust layout might be different.
If unsure - would it be possible that I purchase the mounts and crossmember and if it doesn't work return for a refund?

No, they won’t fit as currently designed. We have a 64 C10 in the engineering lab now that is going through the mock-up and evaluation process and I’ll post the results of that exercise here once it has been completed.
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[Spun Bearing]

Originally Posted by toddoky

No, they won’t fit as currently designed. We have a 64 C10 in the engineering lab now that is going through the mock-up and evaluation process and I’ll post the results of that exercise here once it has been completed.
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Great - thanks for the response.

[toddoky]

The two other part numbers for the transmission crossmembers for this application were released today. As I mentioned in my answer to post #82 above, the main crossmember assembly is the same in all three crossmembers, the two new ones added today just come pre-packaged with specific spacer blocks that are used to accomodate the transmissions they are listed for use with.