Stock 440 Block Horsepower Limit

[Schober Motorsports]

8 years later from starting this thread... I have answers to share! Based on everything I've gone through with the different engine builds in the same car... I'mma call it 650 HP is the max a stock block can reliably handle and actually stay together. I wrote up an entire tech article on my website highlighting the different builds and what failed with each one. See link below if you'd like to check that out! Hope yall have a great day!

Factory 440 Blocks: Real HP Limits, Common Failures, and Lessons Learned

 

[stage3]

8 years later from starting this thread... I have answers to share! Based on everything I've gone through with the different engine builds in the same car... I'mma call it 650 HP is the max a stock block can reliably handle and actually stay together. I wrote up an entire tech article on my website highlighting the different builds and what failed with each one. See link below if you'd like to check that out! Hope yall have a great day!

Factory 440 Blocks: Real HP Limits, Common Failures, and Lessons Learned

i have a cure for that.......

FOR SALE - 505" mopar mega block wedge motor long block or short

 

[Cranky]

8 years later from starting this thread... I have answers to share! Based on everything I've gone through with the different engine builds in the same car... I'mma call it 650 HP is the max a stock block can reliably handle and actually stay together. I wrote up an entire tech article on my website highlighting the different builds and what failed with each one. See link below if you'd like to check that out! Hope yall have a great day!

Factory 440 Blocks: Real HP Limits, Common Failures, and Lessons Learned

Your lifting chain is too light.....

 

[Cranky]

8 years later from starting this thread... I have answers to share! Based on everything I've gone through with the different engine builds in the same car... I'mma call it 650 HP is the max a stock block can reliably handle and actually stay together. I wrote up an entire tech article on my website highlighting the different builds and what failed with each one. See link below if you'd like to check that out! Hope yall have a great day!

Factory 440 Blocks: Real HP Limits, Common Failures, and Lessons Learned

It would be great if you could copy and paste that info here......

 

[Schober Motorsports]

i have a cure for that.......

FOR SALE - 505" mopar mega block wedge motor long block or short

I'm waiting for one of those 440 Source blocks. Pricing is looking promising with them!

 

[RemCharger]

I have a 440 that makes 630 NA with stock crank, eagle rods and SRP pistons. I made 50 nitrous passes (125 shot) in a 4100 pound tank running 10.30’s. I spin it up to 6800 +. So far no issues. Stock bottom no girdle.

This bottom end is still alive and well, had one sorted out run so far at a 10.50.. ( knocks on wood)

 

[Cranky]

This bottom end is still alive and well, had one sorted out run so far at a 10.50.. ( knocks on wood)

What's the weight of your car? Had a 68 roadrunner that would go 10.50's but wasn't consistent but became consistent as could be at 10.68 @125. Car was just under 3300.

 

[RemCharger]

What's the weight of your car? Had a 68 roadrunner that would go 10.50's but wasn't consistent but became consistent as could be at 10.68 @125. Car was just under 3300.

W/o driver somewhere around 3250-3300. The trans was going during that last outing and wouldn't upshift quickly. So I was on the limiter at 7k in 1st 2nd 3rd.. the tires were a bit short. Put a 72 chip in and gained a mph (127) but still on the chip.

 

[KohrtRacing]

Our 500 stroker pushes my dragster high 8’s at low altitudes. Dyno’d 620hp. It’s coming up on 750 runs.

We firmly believe once you get past 675hp, you are playing with fire.

 

[Dodge 330]

We have ran 10.01 @ 133 in a 3,700 lbs. car with a stock block. No fill, no girdle and ARP main studs. A lightweight rotating assembly (Molnar crank, rods and Mahle pistons) and an rpm limit of 6500 is what keeps it alive IMO. That and sneaking up on the tune so you don't detonate. We pulled it apart this Winter. The caps and bearings look great. It has seen lots of passes with a 200 shot that had seen it do 10.33 but regularly 10.40's. The 250 shot ran the 10.0 second time out. Once sorted, we plan to drive it to the track, run a 9 and drive for ice cream.

We did 9.92 @ 135 last fall. That translates to 700 rwhp. That's well over 800 at the crank.

The engine finally had a failure, but it was the valve seats coming out of the Stealth heads while parked in the garage!

Pulling apart the engine, all the bearings and caps still looked really nice. The machine shop was perplexed when I told him what I was doing with it.

It is now back together with new pistons and Trickflow 240 heads.

 

[RemCharger]

We did 9.92 @ 135 last fall. That translates to 700 rwhp. That's well over 800 at the crank.

The engine finally had a failure, but it was the valve seats coming out of the Stealth heads while parked in the garage!

Pulling apart the engine, all the bearings and caps still looked really nice. The machine shop was perplexed when I told him what I was doing with it.

It is now back together with new pistons and Trickflow 240 heads.

View attachment 1950286

Will be interesting to see what it does on the motor now.

 

[Dodge 330]

Will be interesting to see what it does on the motor now.

Hoping for 10's. It did 11.1's @ 121 before.