With a bore of 4.300x4.375 stroke it makes a 508. You can bore the existing sleeves just like any block. If they end up unservicable, they are replaceable. I'm not going to make an undersquare engine. It will be 4.280 x4.250. I thought about doing an odd ball engine just to be rare, but it adds stress to the pistons limits the rpm potential a Hair.....

Nice! Do you have a target for top useable RPM?

kick azz... is all that comes to mind right now!:unibrow:

Awesome Todd! Man those aluminum BBCs are nice :D .

Any particular reason you went with the ZL-1 block over a Brodix, Dart, etc?

John

There were a few factors. Weight, GM Engineering, and last but certainly not least, history. The 540 idea came and went pretty quickly. I had to be a little economical. This allows me to reuse my pistons, carb, clutch, and fuel system. Going 540 would have added 50 lbs even in aluminum and my components just aren't ideal. This should provide all the power I need to do what I intend. Pretty sure I found the only resale block for sale in the US. It hasn't been used but I saved about $900 over getting it at the parts counter.

The usable RPM won't change to much from the old motor. My exact words to him were, "This car is 50% race and 50% street" I don't want to give up my highway cruising drivability but want it to rev higher. I'd say it will have usable power from 2500-6500. Redline should be in the mid to high 6k.....The cam is still up in the air.

Interesting Todd... so how do they get there?

Going to have to rename you now -- "Thumper" fits better...

That looks nice, real nice! for a big block... just had to drop that. Seriously that block is going to make a bad ass power plant.

Very cool on the ZL-1. What's the time frame? All the parts ready to go should be quick I hope. The old school speed shop looks like a great choice.

You get a A+ on your homework project so far.....

Somewhere my math SUCKS Phone water! I've checked this three times and it comes out 473 --- but the actual displacement would - as Todd states - be 508
so what am I missing??

Targeting a February completion. All the parts still need ordered but will happen very soon.

I don't know Greg, I used an online calculator!

Just a question but did you have the oil filter bypass blocked off? I had the same thing happen except my gear failed due to poor engagement coupled with MSD's crappy gear. I haven't put enough miles on mine since to know what the filter looks like but since I have the bypass plugged and everything is forced through the filter I'm crossing my fingers that no major damage was done. You're making me doubt that now :_paranoid