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Old 01-05-2013, 06:36 AM   #1
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Default Best porting LT1 heads?

Which LT 1 heads are best for porting? How do I tell which heads these are?
thanks Leebo
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Old 01-05-2013, 01:08 PM   #2
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10207643 or 10128374. Well thats the heads that advanced induction will only take. Number should be cast by rocker studs.
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Old 01-05-2013, 03:02 PM   #3
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What would these heads be worth?
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Old 01-05-2013, 04:10 PM   #4
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About 80 to 120.

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Old 01-05-2013, 09:51 PM   #5
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Eh, saw a set go for 400 on cg put they were low mileage heads. Probally get 150 for them
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Old 01-06-2013, 07:50 AM   #6
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374 are the best castings for porting next the 643's. The 374's have cleaner exhaust ports and somewhat larger intake with thicker walls for porting. The 643 were supposedly revised but the pair I ported had lots of imperfections in the exhuast ports though the intakes were nice. The 561 heads are thinner and have the best flow for stock heads. You can get cleaner castings in all numbers. Look at the heads for consistent runner size and less clumps bumps lumps in the intake and exhaust.

http://www.nookandtranny.com/Info_LT1.html
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Old 01-06-2013, 08:15 AM   #7
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I've got 3 sets. I know one set has the 643 casting. The other two are still in the car and one set is crated up. I run in a race class that doesn't let you mess with the heads. So, I thought I'd sell one set and keep one for a back-up. I think I'll take a look at the other two. Maybe one will be the 374 casting. Thanks for the good info.
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Old 01-07-2013, 07:13 AM   #8
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Try to locate a set of 561 for limited sportsman class racing lighter castings better flowing. And ya know soda blasting the insides of the pockets to the ports to make sure their good and clean isn't considered porting he he he.

Lloyd Elliot flow tested them in stock form vs 643 and 374's post #20

561 casting flow #'s - Page 2 - CamaroZ28.Com Message Board
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