Bracket Talk
How strong are Dart CI blocks?

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May 01, 2025, 10:53 AM
Bruce Williams
How strong are Dart CI blocks?
Like the title says.
Dart cast iron block with billet caps.
Blown alcohol Chevy 540 35 PSI.
Best ET in the 1/8 is 4.11 178.
I broke a World products block with billet caps due to a broken intake stud causing boost to go from 35 to 41 psi. This resulted in a torched head and pistons.

So the question is, I'm pushing the the limits of this block?


Bruce Lee Cool

Experience is what you get when you don't get what you want.
May 04, 2025, 10:06 PM
seabass
if the tune up is good I would think you would be fine.. Im switching one engine from aluminum to a nbew dart iron block, but I wont run it till next year.... hopefully


J.R. Baxter

""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen."

2025 Miller
Rolla Competition Engines
ProCharger
Hoosier Tires
Abruzzi
May 05, 2025, 08:57 AM
Big Steve
quote:
Originally posted by seabass:
if the tune up is good I would think you would be fine.. Im switching one engine from aluminum to a nbew dart iron block, but I wont run it till next year.... hopefully


So your going to add 100+lbs to your car? I would have never seen that coming Eek
May 05, 2025, 09:33 AM
rusty
if you are talking about big m 2,it will be fine.it will need series work to get oil back to the pan.it different from original block,but mine works fine


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

May 05, 2025, 01:01 PM
Bruce Williams
quote:
Originally posted by rusty:
if you are talking about big m 2,it will be fine.it will need series work to get oil back to the pan.it different from original block,but mine works fine

Yes big M2. I run #8 returns from the back of the head to the oil pan.


Bruce Lee Cool

Experience is what you get when you don't get what you want.
May 05, 2025, 10:21 PM
seabass
quote:
Originally posted by Big Steve:
quote:
Originally posted by seabass:
if the tune up is good I would think you would be fine.. Im switching one engine from aluminum to a nbew dart iron block, but I wont run it till next year.... hopefully


So your going to add 100+lbs to your car? I would have never seen that coming Eek


I was reluctant to do so but im told I will pick up with Iron over the aluminum, like many others have done... per my engine man... hes been on me for years to do it...


J.R. Baxter

""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen."

2025 Miller
Rolla Competition Engines
ProCharger
Hoosier Tires
Abruzzi
June 03, 2025, 12:40 PM
CURTIS REED
quote:
Originally posted by seabass:
quote:
Originally posted by Big Steve:
quote:
Originally posted by seabass:
if the tune up is good I would think you would be fine.. Im switching one engine from aluminum to a nbew dart iron block, but I wont run it till next year.... hopefully


So your going to add 100+lbs to your car? I would have never seen that coming Eek


I was reluctant to do so but im told I will pick up with Iron over the aluminum, like many others have done... per my engine man... hes been on me for years to do it...


Because you need all that extra HP??? LOL