Hey guys, I have not posted in a long long time as my car has literally sat in the garage for 7 years, while I just sit here as my wife pops out daughters, 4 of them to be exact.

Here is my issue. I finally started to build the car and decided to add a Procharger, got a huge deal. My issue is the 4 bolt block was bored .060" over because it had some cylinder damage. The block was machined by ISON racing engines which is a part if Cometic Gasket. The bock was checked over and over and I was insured at .060", I would be fine for high compression setup. I know .060" over is not the best idea for boost so I was thinking using Blok Fill and having it touch honed after in case there is some distortion.

A few questions:
1: The Procharger is a D1SC 12 Rib setup with dual intercooler setup, has a 12psi pulley now, is that pushing it?
2: The internals are completely forged and studded, minus the pistons yet, I have not made them yet. My question is, should I shift too a more volume head over a huge dish piston to keep the pressure out of the cylinder as much as possible or stay with the AI ported Stockers and just go with 2618 Forged Dished pistons?
3: If it seems like a logical plan, would it be street worthy.
4: Should I just say F it all and find a LSx and swap?

Thanks for any help guys, it's time she comes back out this year.

 

So they sonic checked the cylinders and didn't find any thin spots and they magnafluxed it for cracks, and say it is OK for forced induction. First, I'd cc the heads and check the deck height and head gasket thickness and piston availability to see what you can get for static compression, and if you can get 9:3 or less, you should be OK. Granted the bigger chambers and thicker heads are preferable to a more carved out weaker piston, but it will work either way if you build it right. The guys that fill the blocks usually filled to the bottom of the freeze plug holes. It will still be street worthy, especially if you don't go crazy on the cam. You may need to build your fuel system to handle the demands of a 12 psi FI engine.

 

Thanks for the response. I can get to 9:1 with the stock ported heads using dish pistons with a rod clearance hump in the center if needed. I agree the bigger cc head would be better if I can afford it though.

Filling it may be the way to insure it a little for me. Yes, the block was sonic checked and all cylinder walls were found to be pretty even and zero cracks.

The fuel system is almost done. The stock tank was sumped and I'm going to run a unchosen fuel pump through the 3/8" feed and 5/16" return already ran on the car.

Thanks!

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As long as you're running a stock stroke crank you shouldn't have a lot of trouble finding a low compression piston with a decent ringland thickness. I think my 31cc dished JE pistons put me at 9.2:1 on my 383 and they're still plenty thick enough.

I wouldn't worry about filling the block for your application. You probably won't be pushing more than 600-650 hp at 12 psi which shouldn't produce enough stress to flex the block at all.

I don't see the point of running a sump and noisy external pump through the stock fuel lines. Don't get me wrong, the stock lines are sufficient for what you're doing but a larger in tank pump would run cooler and be far less noisy.

 

I am running a 3.75" stroke. I can design and make any pistons I want, I have that ability due to where I work. I can run a rod clearance hump dish and keep the deck in the .200" range and the lands thick.

I am just looking at filling due to many people saying I'm going to explode a .060" over block, I have only used .030" over at max in the other 2 motors I have built.

Also, the fuel system is overkill but the project was originally supposed to be something way more.

Thanks for the response and help, I do appreciate any and all insight.

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Filling will shrink and distort the bores.