Spring is on the way, and Tweety Bird has a fresh motor, just in time for the upcoming Targa California in April. The LZ22 is in with the unported W53 closed chamber head (seats ground and new seals), stock size valves, an Isky stage 1 cam (L475- 475 lift, 270 duration), rejetted Weber DCOE42's on an unported Warneford intake manifold, stock L16 exhaust manifold into a 2" pipe on back. Timing is set at 27 degrees max advance and I limited the total advance on the diz to 15 degrees with JB weld per Jason Gray's distributor page. I can't advance it any more without knocking, and it's currently running on the rich side. It also got a NOS fuel pump and a fresh 3 row radiator. In an effort to rule out the fuel starvation problem, I pulled the gas tank and it was clean as a whistle inside. I also sucked fuel through the line from tank to engine bay with a 60cc syringe and it flowed very easily. It appears that the original fuel starvation problem was probably a bad mechanical fuel pump. While the motor was out, the original paint in the engine bay cleaned up nicely.
The motor pulls hard in the low and mid range; much harder than the L16 did. Power levels off around 5500 rpm, but it'll rev fine to 7K. New air cleaners are going on soon to help facilitate top end flow. There is a significant increase in the top end power when I have the air cleaners off. ITG filters are going on. I am planning to then go to the dyno for final tweaking, hopefully before April.
I also installed an Innovate Motorsports air/fuel meter. This is a really cool guage that takes oxygen sensor readings off a Bosch O2 sensor 6" behind the collector pipe in the exhaust and gives you real time air/fuel meter readings while your driving. In a modern car, this info feeds into the fuel injection and makes mixture adjustments accordingly. For carbs, you change your jets to get it right. Fun stuff.
Carb settings, pre dyno, running well:
Weber DCOE 42's
3.5 aux venturis
F2 emulsion tubes
60 F2 idle jets
40 pump nozzles
60 bleed backs
10mm pump rod
Frankenstein meets Tweety Bird:
Stubby stacks- worth 1-2 HP?:
'72 4 door 510, '68 2000 Roadster