Join Date: Sep 2005
Location: Geismar, LA, USA
Re: what bore size would you recommend for DART block?
A few notes:
Racer- there is no problem going 4.185 with the block if that's what he wants to do. Dart doesn't charge $2500 for weak blocks. I do understand what you mean about leaving more meat, but I also know that high RPMs hurt long rods and that Dart blocks are damn near bulletproof.
Blown- if you want to start N/A, start that way and if you want to add a turbo later, just switch to the 27cc dished pistons as mentioned. I've seen STOCK (130,000 miles) 302s with STOCK intakes, heads, pistons, crank, rods, etc. (okay- they did add a main girdle) running sub-11s and over 500hp.
EBXR- piston companies know how to notch pistons to clear the valves. If he's running high compression with boost, then he needs to be shot, but that's probably the only time the notch could possibly be seen as a weakness. Also, it's not expensive to order pistons as high as 4.185" bore. Forged aluminum pistons with 4.185" bore is another story- maybe that's what you're thinking about.
Blown, back to you- I don't know how rich you are, but from the parts you've listed, you're looking at investing $7,000 in this motor, minimum, if you assemble and install it yourself. If you're going to do that, go ahead and run Edelbrock's Victor or Victor Jr power package and turbo it with the dished pistons mentioned above. That's my opinion. It makes absolutely no sense to waste a Dart block and forged rotating assembly on a N/A motor that isn't running on alcohol. That's my opinion. Again, keep us updated and keep asking questions- good debate going here.