Alright, I've got an 89 CRX Si for reference. Just got it, it's undergoing a full once over with the ol' fine tooth comb. The powerplant I'm using is a D16Z6 complete longblock mated to the stock 89 CRX Si transaxle using the D16Z6 clutch, pressure plate and flywheel, as well as the 89 Si axles and shiftlinkage ( of course ). Everything is converted to OBD1 using non other than Rywire.com's OBD0-OBD1 conversion wiring harness, with VTEC sub-harness and distributor jumpers (it's tits to be probably the only guy in Ohio with this, let alone one of the few who don't have to do the ghetto-fab'd A6 dizzy on the Z6 head which is sooo wrong, ONE MILLION PROPS to Ryan at Rywire.com ). This is basically all stock, cleanly converted and will work very nicely in the CRX setup. SOHC VTEC + short gears + light car = ..well.. makes the D series not look so bad afterall ( I'm a B-Series whore ). I've been doing some research on OEM parts compatibility between the engines to find the best possible combination of parts to frankenstein into one setup. This is where you guys come in, I need opinions and advice here... I've got two options, turbo or NA. Turbo... It would probably go something like this... HF manifold, DSM adaptor plate, 14B turbo charger, 2.5BAR Motorola MAP sensor, Crome on my P28... still unsure of the of intercooler, various fittings etc... but the stuff I listed is the base of what I've got so far. The dynotuning will happen on either a DynoJet WOT inertia dyno or a DynoJet eddycurrent loading dyno, either way, it'll be tuned well on stock internals. Discuss... Next up is the NA build, which I'm leaning towards. The compression of one of these is approx 9.2:1 stock. Using the A6 pistons, you can cram it up to about 10.5:1 ( around 10.46xx:1 more specifically ). So, right off of the bat, it's basically a SOHC B16A Not really, but you understand. I'm currently using the A6 stock header, which I'm replacing with the 4-2-1 Z6 stock header here shortly. A question I have is, should I use the A6 one piece stud girdle and if so, will it fit properly? It's very strong and I prefer a lot of strength in the bottom end of my engines. Also, the D16A1\ZC rods are a lot beefier and seem more desirable. Would they raise compression further? Will they work on the Z6 crank? What bearings would I use? What about the crank, the Z6 is pretty good already but I'm wondering if there is a better factory crank out there? I like upper RPMs, so this crank is okay so far, but if there are better options, I'd like to know. Basically, I'm looking for the best crank strength, RPM limits, power limits etc... in a stock crank, what will suit this NA build the best? I'll probably use the Y8 two layer headgasket and raise the compression slightly. Also, with any combination of the A6 pistons, Z6 rods, D16A1\ZC rods, Y8 headgasket... will I still have adequate valve to piston clearance, or should the valve reliefs be opened up? Any input is appreciated, especially regarding my NA questions about engine building. Thanks in advance guys.