Head Casting Numbers
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Instructor
Joined: Aug 2007
Posts: 131
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From: Madison NJ
Head Casting Numbers
I just for the heck of it was looking up casting numbers from my 1970 350/300hp and the heads do not match 1970 Corvette head number.
What are they and what cubic inch/hp/tq year motor are they from?
3927188 GM A260
What are they and what cubic inch/hp/tq year motor are they from?
3927188 GM A260
Le Mans Master
Joined: Jun 2005
Posts: 5,447
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From: Syracuse NY
1969 3927188 307 1.72 1.5
or
1969 3927188 327 1.72 1.5
Got this from the site below.
http://www.nastyz28.com/sbchevy/sbch.php
or
1969 3927188 327 1.72 1.5
Got this from the site below.
http://www.nastyz28.com/sbchevy/sbch.php
Le Mans Master
Joined: Jun 2005
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From: Syracuse NY
Le Mans Master
Joined: Dec 2003
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From: Fremont CA
Jan 16, 1969 Casting date 186 heads NCRS CORRECT! if your Vette's build date is later than January. Good heads but don't have hardened exhaust seats for unleaded gasoline, run a TEL additive from Jack Podell or other source. Same heads as 350HP and 370HP high performance 350's without bigger valves, if you seats are bad they can be opened up to 2.02/1.60 valve sizes but, make sure the machinist opens up the combustion chamber wall for larger intake valve or it won't flow and better that the smaller valve sizes. Find a shop with a Sunnen VGS type of cylinder head machine for re-building them whan you get around to it.
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Le Mans Master
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St. Jude Donor '05, '09, '15
Jan 16, 1969 Casting date 186 heads NCRS CORRECT! if your Vette's build date is later than January. Good heads but don't have hardened exhaust seats for unleaded gasoline, run a TEL additive from Jack Podell or other source. Same heads as 350HP and 370HP high performance 350's without bigger valves, if you seats are bad they can be opened up to 2.02/1.60 valve sizes but, make sure the machinist opens up the combustion chamber wall for larger intake valve or it won't flow and better that the smaller valve sizes. Find a shop with a Sunnen VGS type of cylinder head machine for re-building them whan you get around to it.
Intermediate
Joined: Oct 2006
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From: metairie louisiana
I also believe the 041 head was used on lt1 and 302 z28's
492 straight plugs had the big valves 292 and 492 angle plugs and were 2.02 &1.60 but were over the counter never on a production car
p.s if you need a set of 041 i may have a set 1.94 1.5 with hard seats but i am not sure on the year
thanks donnie
492 straight plugs had the big valves 292 and 492 angle plugs and were 2.02 &1.60 but were over the counter never on a production car
p.s if you need a set of 041 i may have a set 1.94 1.5 with hard seats but i am not sure on the year
thanks donnie
Le Mans Master
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From: Maryland
St. Jude Donor '05, '09, '15
