Moroso A-B

[MYBAD79]

an update :
Bores could maybe be cleaned up with 0.003" extra honing, but then clearances will be at .008 and way to much with the type of piston i'm running.

Block is a boat anchor now and all due to the a$ at that machine shop.

what's the recommended clearance for your pistons ?? Forged pistons usually tolerate (or "need") a lot more clearance than cast or hyper pistons...

This is from JE's website:
The factors that affect this are cylinder wall thickness, whether the block is filled, the overall compression height of the piston, piston material and thickness, and whether a marine engine is to see fresh-water cooling. Most small blocks get .004 piston to wall clearance and most big blocks get .005 due to the use of our 2618 high-strength alloy. For heavy blower and nitrous applications, Wiseco recommends adding .001 to the standard clearance. Special note: Clearance numbers are obtained from measuring the largest diameter of the piston, typically at the bottom of the skirt. All measurements should be taken 90 degrees from the pin centerline.


Maybe you can get by using your block.... :thumbs:

 

[BBShark]

This is from JE's website:
The factors that affect this are cylinder wall thickness, whether the block is filled, the overall compression height of the piston, piston material and thickness, and whether a marine engine is to see fresh-water cooling.

I never thought about it but I guess a marine engine that pumps in (relatively) cold water, is a different animal than a car engine.

 

[Belgian1979vette]

Who was it? post and dros?? Dymo track???

Yep, Post and Dros.

Only thing is they use stud to torque the plate down..

 

[Belgian1979vette]

an update :
Bores could maybe be cleaned up with 0.003" extra honing, but then clearances will be at .008 and way to much with the type of piston i'm running.

Block is a boat anchor now and all due to the a$ at that machine shop.

what's the recommended clearance for your pistons ?? Forged pistons usually tolerate (or "need") a lot more clearance than cast or hyper pistons...

This is from JE's website:
The factors that affect this are cylinder wall thickness, whether the block is filled, the overall compression height of the piston, piston material and thickness, and whether a marine engine is to see fresh-water cooling. Most small blocks get .004 piston to wall clearance and most big blocks get .005 due to the use of our 2618 high-strength alloy. For heavy blower and nitrous applications, Wiseco recommends adding .001 to the standard clearance. Special note: Clearance numbers are obtained from measuring the largest diameter of the piston, typically at the bottom of the skirt. All measurements should be taken 90 degrees from the pin centerline.


Maybe you can get by using your block.... :thumbs:

JE's recommendation is 0.004 minimum. I had .0055, so already plenty. Bores need to go .008 to get round again. If i were to use the block, i would need custom made pistons and even then there are other areas that are questionable.:surrender:
The thing to remember here is, i have Oliver rods for this combo. These cost wel of 1200 $ and a lot more when i get them in my hands. They are about the only thing that is still good in the bottom end. I don't want these to stick out of on side of the block if you know what i mean.


I will re-assemble my old block to get the car running again after so long. Then i will see if i will still get around building this combo.

 

[Twin_Turbo]

Or you can order a set of custom pistons