question about stock 1971 stock block

I have a 545 ci engine, useing a 1971 stock block. With ARP main studs and girdle. Very few passes on engine. I normally turn engine abouth 64,00 rpm. I may turn engine 6800 if I need to get a buddy driving a chevy off my back. no often. How worried should I be abouth the mains giving up on me. I really been babing this engine due to that thought. I bracket race a 1971 maverick big tire. Best time to date 5.56 @ 128 mph. Best 60' 119. I know a motersport block is my best. But is going to spend money on updating the car for safety. Please share inputs on this block. I was a long time member 460 ford. com. just now finding you guys. Thanks so much. Unclewiley















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You should be fine with the two bolt block. How much power do you think its making?? The D1VE block can take tremendous abuse and still want more!!
I used to run the same block as a 472 cubic incher, but I was running it to 7700 RPMs and hitting it with a 200 shot of NOS. I would get a bit of 'cap walk' on the mains, but never broke the block or a main cap....until a piston exploded and took out everything!!....ahh, the good old days!!

Thanks so much for your input. HP i don't know. I am running Blue thunder heads. Roller cam. I my have 15 passes on moter. My buddies throw out horse power # all the time without dyno time. i don't.

If you have a 6.700" length rod in it, it won't be long before it starts losing ring seal then using oil with the shorter cylinders of that block.

Otherwise, it should be fine. The mains are not a problem if it is balanced correctly.

I am useing a 6.700" rod. I am running a 10 qts pan and no to check the oil. On that short cylinders and 6.700' rod. what is the issure with the rings. what other bad can anyone share with me.

unclewiley wrote:I am useing a 6.700" rod. I am running a 10 qts pan and no to check the oil. On that short cylinders and 6.700' rod. what is the issure with the rings. what other bad can anyone share with me.

The simple issue is ... with that 4 1/2" stroke the piston comes out of the bottom of the bore at bottom dead center all the way to the middle of the wrist pin and the associated large amount of piston rock wears out rings, (and sometimes piston skirts), a lot faster than normal.

rmcomprandy wrote:If you have a 6.700" length rod in it, it won't be long before it starts losing ring seal then using oil with the shorter cylinders of that block.

Otherwise, it should be fine. The mains are not a problem if it is balanced correctly.

unclewiley wrote:I am useing a 6.700" rod. I am running a 10 qts pan and no to check the oil. On that short cylinders and 6.700' rod. what is the issure with the rings. what other bad can anyone share with me.

not a stone a ?
____ & roll
=
Piston-______!

Got treed on that one

So my best bet is to go ahead and spend the money and buy the motersport block and save a lot of good parts. And not tare up my heads agan.

rmcomprandy wrote:

unclewiley wrote:I am useing a 6.700" rod. I am running a 10 qts pan and no to check the oil. On that short cylinders and 6.700' rod. what is the issure with the rings. what other bad can anyone share with me.

The simple issue is ... with that 4 1/2" stroke the piston comes out of the bottom of the bore at bottom dead center all the way to the middle of the wrist pin and the associated large amount of piston rock wears out rings, (and sometimes piston skirts), a lot faster than normal.

You’ll be fine in a race car, it’s not like your going to be driving it daily