Dart BBC CNC 380's

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SupStk
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Re: Dart BBC CNC 380's

Post by SupStk »

MELWAY wrote: Fri Apr 02, 2021 11:04 pm
SupStk wrote: Fri Apr 02, 2021 6:09 pm Another zombie thread!

Since I was the OP, thought I'd state the finished version on this build. Ended up getting 452 cfm at .900 and eliminated the stagnated areas of flow. The engine made 1084hp. Not quite the 1100 hp goal but the customer seemed happy.
Did you go to a 2.350” valve and a steeper seat?

Yes I did. The Sweet spot was lowering the floor approach to the SSR
Monty Frerichs
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Re: Dart BBC CNC 380's

Post by MELWAY »

SupStk wrote: Sat Apr 03, 2021 12:24 am
MELWAY wrote: Fri Apr 02, 2021 11:04 pm
SupStk wrote: Fri Apr 02, 2021 6:09 pm Another zombie thread!

Since I was the OP, thought I'd state the finished version on this build. Ended up getting 452 cfm at .900 and eliminated the stagnated areas of flow. The engine made 1084hp. Not quite the 1100 hp goal but the customer seemed happy.
Did you go to a 2.350” valve and a steeper seat?

Yes I did. The Sweet spot was lowering the floor approach to the SSR
Nice work. They pretty darn good heads then great results
I want to try their new 365 port with the 2.350 1.85 valve combo.
3370lb Sedan 9.89@136MPH 358chevN/A
SupStk
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Re: Dart BBC CNC 380's

Post by SupStk »

MELWAY wrote: Sat Apr 03, 2021 5:36 pm
SupStk wrote: Sat Apr 03, 2021 12:24 am
MELWAY wrote: Fri Apr 02, 2021 11:04 pm

Did you go to a 2.350” valve and a steeper seat?

Yes I did. The Sweet spot was lowering the floor approach to the SSR
Nice work. They pretty darn good heads then great results
I want to try their new 365 port with the 2.350 1.85 valve combo.
Thanks,
Are the 365 cnc runners?
Monty Frerichs
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Re: Dart BBC CNC 380's

Post by MELWAY »

Yes they are
3370lb Sedan 9.89@136MPH 358chevN/A
Fatman
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Re: Dart BBC CNC 380's

Post by Fatman »

SupStk wrote: Sat Apr 03, 2021 12:24 am
MELWAY wrote: Fri Apr 02, 2021 11:04 pm
SupStk wrote: Fri Apr 02, 2021 6:09 pm Another zombie thread!

Since I was the OP, thought I'd state the finished version on this build. Ended up getting 452 cfm at .900 and eliminated the stagnated areas of flow. The engine made 1084hp. Not quite the 1100 hp goal but the customer seemed happy.
Did you go to a 2.350” valve and a steeper seat?

Yes I did. The Sweet spot was lowering the floor approach to the SSR
Did you drop the peak height of the ssr or lowered the port floor but left the peak height of the ssr the same?
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Re: Dart BBC CNC 380's

Post by SupStk »

I dropped the floor to the ssr and blended the transition, effectively lower it somewhat. Doing that you have to constantly flowtest, since it's easy to go too far and lose what was gained.
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Re: Dart BBC CNC 380's

Post by Fatman »

SupStk wrote: Mon Apr 05, 2021 12:49 pm I dropped the floor to the ssr and blended the transition, effectively lower it somewhat. Doing that you have to constantly flowtest, since it's easy to go too far and lose what was gained.
Did you take a measurement of intake ssr crown height off the deck?
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