SySt said:
Once I have the car running my first thought will be making my own long tube headers. Fact is Hooker makes a set of block hugger headers, and one other MKIII Supra guy putting an LM7 in his Supra has tried those and they do not seem to work.
The blockhuggers I am using on the LM7 are the Sanderson CC1-LS1. The driver side was the better of the two, no steering shaft interference at all, the big problem I had was with the passenger side. I ended up cutting the flange off and welding a 2.25" pipe onto it and it has a bend at the bottom where a 2" pipe is clamped inside. Another 2" pipe comes off the driver header and they Y into a 3" pipe via a Flowmaster 2.25 x 2 to 3" collector. From there, the 3" pipe follows the stock location to a reversed dual inlet / 3" outlet muffler- looks stock! The exhaust sits nice and high, I don't see any ground clearance issues.
I attached a few pics of the exhaust, and a recent underhood pic (waiting on tuning software to get it to run).
The Hookers with their center outlet would not work at all for my setup.
The ideal manifold on the passenger side would have the outlet about even with the #5 cylinder, there are some odd angles involved due to the Supra K-member and the Gen 3 V8 starter.
With the proper skills and bends, it would be easy to fab up a set of 1.75" longtubes. I found some bends, but I lack the skills to do that.
Since this was a scratch built conversion, it could have been done better in many respects (20/20 hindsight). The main thing is that the motor sits too high by about 1/2". I used a truck oil pan to size the mounts, and the F-body pan lets it sit lower, and it may have gone back a little as well, which would help with shifter placement and the exhaust. It would have been real nice to throw that Garrett GT37 turbo in there as well
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