Re: Weight discourages you?
The real question here is what tools and equipment do you have and how much time and effort are you willing to invest in this.If money and fabrication skills are not a problem then just about anything from a L-28et to a jag V-12 will fit in the Zs cavernous engine bay.The L-28et swap is simple and effective(300 horsepower from a basicly stock motor with a T3/T4 hybrid,intercooler and injection tunning).V-8s both ford and chevy remain a favorite because of there low cost and exellent weight distibution.A Vg-30 either single or double cam is another option if you want the diplacment along with the motor setback of a V series swap(if you look at these the front of the motor is usually behind the front crossmember).For someone with more limited funds or fabrication skills a L-28 with a 88-89mm bore and a L-28d crank will yield about a 3.1 liter L motor.The diesil crank has a few detractors because of the poor rod to stroke ratio but there are lots of crank,piston and rod combos that will give a very large 6 without a whole lot of money involved if you stay with nisssan parts and cast pistons.Try this web site for a whole bunch of ideas about what is possible
http://home.att.net/~jason510/ ,all 4 cyl stuff but it gives you an idea about how much is possible with stock parts.If it where me I'd try for a combo that would allow the use of the P90a head with the hydrolic lifters since I'm spoiled by this heads quit operation.Beyond this any of the L-6 series stuff will fit with the proper accesorys the only real differences is internal.Your budget and time are the real deciding factors here.
