Stock LT1 & LT4 head flow #??

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Oct 21, 2005 | 08:18 AM

Paul Workman

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Le Mans Master

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From: South-central Missouri

Stock LT1 & LT4 head flow #??

Forgive me if this is often asked, but what are typical head cfm flow numbers for stock LT1 & LT4 heads, sans polishing, i.e., out of the box (assuming the same lift, e.g., .5 or .6)??

Thanks in advance. Great board!!

Last edited by Paul Workman; Oct 21, 2005 at 08:19 AM. Reason: fix typo

Oct 21, 2005 | 04:55 PM

MYCoupe

Melting Slicks

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From: Hewitt NJ

Check these numbers out:

http://www.precisionporting.com/index_files/Page448.htm

Oct 21, 2005 | 05:09 PM

VenkmanP

Safety Car

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From: VA

http://www.chevyhiperformance.com/te...598/index.html

Oct 21, 2005 | 05:49 PM

sickspeedvette

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From: Dallas/Spring Texas

Quote:

Originally Posted by Admiral94

Check these numbers out:

http://www.precisionporting.com/index_files/Page448.htm

It looks to me like the mighty LS1 heads with a stg 3 port job were out-flowed by the LT4's with the same.

Oct 21, 2005 | 06:48 PM

vader86

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From: Athens AL

C7 of the Year - Unmodified Finalist 2021

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There are several flow charts in links on my site.

Oct 21, 2005 | 08:06 PM

Paul Workman

Thread Starter

Le Mans Master

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From: South-central Missouri

Head flows

Thank you all very much. Very helpful!!!

Oct 21, 2005 | 10:08 PM

Zix

Le Mans Master

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From: Phoenix AZ

Quote:

Originally Posted by sickspeedvette

It looks to me like the mighty LS1 heads with a stg 3 port job were out-flowed by the LT4's with the same.

I find those numbers a little suspect to be honest, but beyond that the major advantage of the LS head is how the air is brought to the combustion chamber. In the GEN1 SBC heads there is a large bend in the intake tract to vacilitate the valve stem. In the LS heads it is a completely straight shot, which makes the airflow much more efficient, which is why the LS1/2/6 can make insane HP/TQ numbers with a simple heads/cam swap. There are LS2 heads and cam engines out now that make close to 500RWHP, that number is barely attainable on some of the best put together radical cammed L98/LTx 383/396+ stroker motors.