I have a 67 chevelle

when I had a 6.0 I was running speed engineering 1 3/4” longtubes and they fit well.

I have a 427ci LS Next 6 bolt (LSX style) cylinder heads.

I bought a set of speed engineering long tubes with a 1 7/8” primary and the #1 cylinder primary is blocked by a head bolt.



has anyone run into this issue?

has anyone ran the hooker black heart LS swap A body headers??

thanks!

 

[QUOTE=The0nlyon3;20345220]I have a 67 chevelle

when I had a 6.0 I was running speed engineering 1 3/4” longtubes and they fit well.

I have a 427ci LS Next 6 bolt (LSX style) cylinder heads.

I bought a set of speed engineering long tubes with a 1 7/8” primary and the #1 cylinder primary is blocked by a head bolt.


Looks like the extra head blots are the issue. If the headers fit otherwise I would see if an extra set of gaskets and a blank header flange would help if used like a spacer.

 

I had the1-7/8 Speed Eng headers on my 67 GTO, but my issue was the #3 spark plug was blocked by the primary tube. I ran them for a while then popped for Hooker Blackhearts 1-7/8 stainless. No issues now with access to the plug and no burning plug wires too. The Blackhearts are stupid expensive but they fit like they should and sometimes that's worth the money. They hang down even with the bottom of the trans pan incase u were wondering. Oh yeah I also torched the old SE headers and bent them away from the frame rail on the passenger side

 

 

 

looks like the blackhearts come straight out from the port before turning down. The SE headers turn right away and hug the block a lot closer. Looks like blackhearts will solve ur problem. ur welcome to come with me on my next bank robbery.

 

Lol tff. I’d look at Dougs Headers swap header before I spent over a 1k.

I was going thru issues until Dougs on a 70 Camaro . I realize it’s a different x car, But it’s free to check out their website

 

so I had a set of Doug’s headers laying around for a different car and tried them out. They fit! So I order some. I will still have to trim some of the bell housing where the starter goes but that’s it.

 

Thanks for getting back with a solution for us A-body guys....

I always really appreciate it when guys get back with reply to threads like this. Be great if you post pictures of the Doug's fitment.

 

Which application did you use? For my B Body, I used SE Chevelle headers.

 

they are going into the car tomorrow. I’ll post pics to show all the tight spots and overall fitment.

 

Got the Doug’s headers installed. Part number is D3336.


I am using a stock style SBC poly mount with eBay swap plates and the stock cross member mounts.


they fit great in the engine compartment but the collectors touch the floor :/ I used a pry bar to try and make more room which it did but not a lot. I’m looking at replacing the body bushings as the are original and probably pancaked.

Swap plate

SBc mount

Passenger side header

Passenger collector hitting floor

Driver header

Driver side collector

Ground clearance

 

Thanks!!

 

Well, to anyone who is interested, I ordered the following from Holley

hooker blackheart 1 3/4” stainless long tubes

70101335-RHKR

hooker engine mounts 1” forward mount

71221008HKR

and stock location mounts

71221009HKR

and Holley clamshell stock style ls engine mounts and poly bushings.

I will experiment with what fits and what doesn’t.

My goal is to get the header collectors to not hit the floorboard

 

My thoughts are to use a thinner mounting plate. We are effectively putting a wedge in between the frame cross member. use a smaller wedge and the engine drops lower.I don't know how to do the math but my guess is that it's more than a 1 to 1 ratio in width / drop. If a thinner aluminum plate worries you just get a a 1/4" steel mounting plate. Beautiful engine btw. Tony

 

thank you!!

the swap plate is .25” thick already.. I’m going to try these Holley mounts.. looks like it would remove that swap plate and I’d get my clearance.

i ordered both Holley mounts (forward 1” and stock location) so I’ll post pics of what fits when they show up

 

Set your driveline angles first, before you do anything. Might be as simple as a trans mount adjustment, to gain header clearance.

 

im going to get a shorter transmission mount too.. the other issue with dropping my driveline angle is the exhaust from the collector will be interfered by the transmission crossmember.

 

So are you saying that your exhaust is going above your trans cross member or is it looped for the exhaust to go through.?

 

the transmission crossmember that came with my t56 kit from SilverSport Transmissions is very similar to this one



the crossmember is tight against the floorboard and drops down where the transmission mounts. The crossmember is approximately 1.5” thick. It’s a boxed tube design.

so the exhaust has to go under the crossmember

i might have one that offers better clearance for exhaust laying around my shop, I’ll have to look for it.

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