[DavidBoren]

As a side note, using head flow numbers from TEA's website regarding their stage two ported 5.3L heads, and an online calculator provided by Wallace racing, the projected redline where head flow can no longer support the displacement at any higher rpms, is 8000. Playing with different VE inputs got readings between 7300 all the way to 9000. So, no matter what, with properly ported heads, the small bore can support six liters of displacement spinning all the way to 8k...

I have no intentions of spinning it that high, but for the sake of this discussion, I thought it to be relevant.

For comparison's sake, the 353ci oversquare engine proposed earlier, 4.125" x 3.3" bore and stroke, using stock LS7 head flow numbers, gives a max redline of 8,300 to 10,900... depending on what VE values you use.

@RodP, I can get 74.5mph in 2nd gear @ 6500rpms with a 1.88:1 second gear and 3.55 rear gears with a 25.7" tire. All of that is theoretical using the Wallace racing online calculator. Rims are based on 2006 z06 18x9 fronts and Toyo R888 275/35R18 tires. Transmission ratio is from the TKO600RR. I would like to use a 5spd transmission and stay around the 3.5:1 range for the rear. So the road race TKO and relatively mild rear gears archives the 70-75 mph in 2nd gear rule.

Same calculator, same tire diameter, same rear gear ratio, same 6500rpms, just changed to the .84:1 OD gear of the TKO600RR, and this predicts a top speed of 166mph. I think that will do just fine.