How much you putting through yours? im at 690 on motor and spraying on top of that. Block is 60 over, not filled, studs, stock caps. Havent seen any signs of an issue, around 20 hits so far. mostly stock 727 never been in it, but has valve body and deep pan. stock a body 8 3/4 housing, spool and 30 spline

More details PLEASE. That sucker must be flying with 690 PLUS the hit.

sounds similar to yours, indy headed 422. mine prolly weighs a lot more, all steel with glass bumpers

I'm nowhere near those horsepower numbers.

what do you make at the flywheel? Would like to compare combos

Just stop. Both of you. This is not going to end well.

My 25 year old X block with studded 4 bolts caps is unbreakable....I hope.

👍👍

I heard X blocks were not that good? Are they?

Everything behind your motor is a time bomb, get rid of the 30 spline asap, I broke that, now I'm tearing up 35 spline spools until 9" money this winter

40 years of racing and I never dynoed an engine. I'm guessing a hair over 500 give or take a few. I hope to step up to a roller cam over the winter to pick up a few more.

800hp on a early 360 block 2 studs 1/2 fill

Numbers dont lie lets see a et slip that will tell us how much power you are really making

Stock block with a fill...4.100 X 4.00 !!

Pump gas with a 904 and 3.73'S !!

150 shot !!

I don't know, it was in the car when I got it, and it hasn't broke yet. I'm afraid to hit with as much nitrous as I've sprayed on stock 440 blocks though.




Numbers lie...I can just be like everyone else and claim my car is 400 lbs heavier than it really is!!



You're doing it wrong...what 60 foots at what weight? Dead hooking a radial?

Ok, keyboard experts: 3095 lbs. on the scale at Norwalk, made this pass at National Trails, don't have DA or weather data.
What was I making at the tire?
What was I making at the flywheel?
When will the block break?
When will the 904 break?
Where can I find two more tenths?

I ran an X block for years. New owner still uses that block. Been beat on for 10-12 years now, at as fast as 140 mph N/A at 3220 weight.
Great piece. Sturdy.

Looks heavy, Gary.
What's the jetting on your "150 shot"?

Ian would drive around me in the back half...it would still be fun!

lol it would be there was some more left in it with the tune ,i need to get some weight of the car and driver lol car is 3200 full street trim and me 360 lbs ,the block was not to happy at this level not sure maybe the fill expanding rebuilding a new engine with a r block should be good for extra 200 hp

Well some of this is good news for me

I am currently working on my procharged build, 69 block half filled, Hughes stud/stud girdle kit with factory mains, factory forged crank, Eagle H beam rods and Speed Pro forged pistons. I am hoping to make about 700 at the crank under max boost.

What's it weigh? MPH?

When you do see signs of an issue, it won't be subtle.