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Figured I would make a new thread here instead of bumping my old one. Old setup in the car was the SBE LS6, btr stage 4 ls3 cam, tfs 220 heads, hi ram with a shearer lid and 103, vac pump, e85, good bit of nitrous, etc, etc. Car ran solid (130mph on motor, 142ish on the 150 shot), but the ls6 was showing signs of some blowby and I already had an L76 from a buddy's G8 at the machine shop. Fast forward....
New motor:
408, L76 block, 4.03 bore, 4" stroke 12cc Dome Wisecos, Gas Ported ported Rings (14.5:1 with an LS9 gasket) Quench is around 0.046" TFS 220 heads heavily worked over to replicate a tfs245 and then some. 2.1/1.6...360ish/270+ Holley Lo Ram with Dual Accufab 4500s on top, 1" plenum spacer 244/266, 640/640 on a 112.5 GZ Vacuum Pump (will run roughly 12 inches at 7k+) BTR Shaft Mount kit with their rocker arms, 685 ultimate rpm spring kit Johnson 2126 short travel lifters, Manton 11/32 pushrods 2" Headers, 3" collectors into a single 5" oval spintech pro bullet muffler E85
Had Liberty faceplate 1-4 in the trans, put a 3.90 in the diff. Switched the car over to a holley terminator with an HCR harness instead of Holleys junk harness. Put some Kirkeys in it, a VFN cowl hood to clear the manifold and built an airpan for the throttle bodies. Goal for the motor is around 700-750 fwhp. Figuring 1.7-1.8hp per cubic inch which shouldn't be at all unrealistic. Should land it around 600-630 whp I would imagine and trap around 138-140 if i do run it at the track on motor. The car will eventually get nitrous again in the form of a direct port.. But I need to get used to the thing again once its running and tuned since I haven't driven it in about 2 years now.
If anyone wants to know the size comparison between a new lt style starter, stock c5 starter, and a power master 9509 starter.. The c5 starter wasn't going to fit well with the 2" headers, so I tried the powermaster out... That was going to be a pain so I bought an lt truck starter and it just falls right in place.
Wow, that’s a serious build for sure, I guess it’s countless hours of wrenching hope it won’t disappoint. Good luck
Yeah, a lot of work. A lot of changes along the way as me and a friend learned/wanted to try new things on our builds (he has a similar setup but in his c6z). Car should do all that I want it to, I have no doubt about that. Put a ton of focus in the motor where it needed it so it can do what I set out to do.
every time I see a badass NA setup I get feeling nostalgic for going back to NA.
quite frankly, a simpler time for me.
this turbo build I have is just taking all the fun out of building a car.
And you helped the build too with the vac pump! I love what you have going on with your car, but I can see it getting to be a bit much with so many variables.
this turbo build I have is just taking all the fun out of building a car.
Yours is a different beast than mine, but in my case just the simple task of drilling and welding some sensor bungs became an extended tour of weeks and months due mostly to my own free time availability and then chasing for service since I don't know how to weld stainless. Even now I will be back to waiting another 5-6 weeks as I send it all out for coating before install.
This aspect for sure makes a simple supercharger strap-on far preferable. Or a cam, valvetrain and heads.
Thanks man. It has been a process lol. Hopefully have it home in the next couple of weeks and spend the winter taking my time wrapping everything up. Was trying to get it running and on the dyno before winter, but I am losing my battle with Father Time and Mother Nature. So instead of rushing everything, I will take my time and make sure I don't miss anything,.
Couple shots of the air pan with the caps welded on to cover and seal around the linkages. Couple more of the catch can @jayyyw made for the car. Trimmed the turn down at a 45° to get the noise out and back instead of straight at the ground.
NA C5Z Build
