Is there something intrinsically inferior about the L24 block? I've heard about the siamesed cylinder bores of the F54 block but does that really make that much of a difference?

An L26 is a stroked L24. An L28 is a bored-out L26. So why not just keep your original engines and just rebuild your original engines already in your cars? It follows that this would be a good idea for the car's resale value as well.

More power! I've got to have more power!

In a word POWER. In two words POWER and TORQUE.

Bored and stroked, you can get about 2.7 out of your 2.4.

Okay I can understand using a 280Z or 280Z-ish head on a rebuilt/modified L24 for power and torque. But I don't understand why so many people get rid of their original blocks. Other than, I guess it's cheaper to just slap in an L28 from a 280Z or ZX...it's kinda sad to me though.

It would seem to me that a 240Z with its original but well-rebuilt L24 would be a very desirable car to have in this market.

Bored and stroked, you can get about 2.7 out of your 2.4.

Turbocharge that 2.7L then. Maybe there's a niche in the market out there that does this but I've never heard of it before.

Because my 240Z came as a roller and the original motor from my 280Z was full of cobwebs on the garage floor. Put two and two together and I have an L28 240Z.

I wish I did have the original block to match the engine plate in the bay. It's somewhere in GA, North of Atlanta.

Because my 240Z came as a roller and the original motor from my 280Z was full of cobwebs on the garage floor. Put two and two together and I have an L28 240Z.

I wish I did have the original block to match the engine plate in the bay. It's somewhere in GA, North of Atlanta.

well you are very certainly excused, based on your story!

It's the other way around. Use a 240 or big valve 260 on a 280 block. It's the block that gives you the inches and inches = power

the only substitute for cubic inches is cubic dollars.

"Speed costs money. How fast can you afford to go"

It would seem to me that a 240Z with its original but well-rebuilt L24 would be a very desirable car to have in this market.

This is true - IF the rest of the car is essentially stock, or can easily be made so. There is added value to a stock 240Z for having the numbers matching motor. But if the rest of the car is modified, that extra value is small. For a modified car, the perceived value of a fresher, and more powerful motor may out-weigh - or at least cancel out - the lack of numbers-matching.

There is also a special case. For the very early cars (first 3 months or so production, aka "low VIN"), the original motor is a big part of the draw, along with general originality.

Edited February 1, 201114 yr by Arne