We compare and contrast eight budget small block Chevy heads. VORTEC HEADS . Its best exhaust-to-intake ... Guide to Chevy Small-Block Production Heads GM Bow-Tie Vortec ... New Bow Ties are the best 23-degree iron heads on the market." A quick reference catalog of Small Block Chevy cylinder head casting numbers including the LT engine cylinder heads. ... Vortec 7400. Original L31 Vortec casting. GM Bow-Tie Vortec ... New Bow Ties are the best 23-degree iron heads on the market." ... to the best performance with the Vortec Bow ... this cast-in Bow-Tie symbol on the outside of the casting. ... and the Vortec is no different. Chevy casting numbers for blocks and heads for small block V8 engines by Mortec. Main menu. - SBC Cylinder Head ... For the flow remember bigger is not always best. Super Chevy tech article on Vortec cylinder heads. Super Chevy tech article on Vortec cylinder heads. ... the best performance with the Vortec Bow ... in Bow-Tie symbol on the outside of the casting. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads ... 354434 and others are 2 bbl heads, and have 1.72" intake valves. ... bad casting number vortec heads? ... Vortec head represents one of the best budget ... the heads by the average horsepower number. Click Header to Sort. A Guide to Vortec vs OE Small Block Chevy Heads . The good vs bad chevy vortec heads. ... and other casting number heads. These are the new heads I bought with a number I have never heard of. ... (NOT casting number) 12558060 cast iron Vortec cylinder head assembly ... PART NUMBER: OPTION: Spark Plugs For Vortec Heads: Chevy Casting Number identification including Block casting ... Use these casting numbers to identify the heads you have. Casting Number. A quick reference catalog of Small Block Chevy cylinder head casting numbers including the LT engine cylinder heads. The new heads 16485906 sbc vortec head. Location of the Vortec heads casting number. The new heads From Crankshaft ... 305 Vortec L30 casting number 12558059 chamber. Chevy 305 engine. Chevy casting numbers for blocks and heads for small block V8 engines by Mortec. Skip to primary content. Vortec L31 cylinder head. LS head casting numbers list ... Small Block Chevy LS Cylinder Heads by Casting Number . For stock heads the best will be the 1996-00 chevy truck 350 vortec heads (I cant remember the casting numbers off hand, but easy to Find best value and selection for your Chevy 305 Bare Vortec Cylinder Heads Casting 12558059 search on eBay. World's leading marketplace. VORTEC HEADS . 16485906 sbc vortec head. 77-90. oval. OPEN. I read different websites stating the good vortec heads were the 96 and up. http://www.sallee-chevrolet.com/fram...ds/Vortec.html Please Note: The casting number myth debunked: The myth is that there is a difference in the Which vortec(L31) head casting number is the ones ... which vortec heads are the good ones? Original L31 Vortec casting. Some of the heads with large flows and big runners ... Iron Heads (same casting as Alum.) 10487052. These are the new heads I bought with a number I have never heard of. Brzezinski Racing Products We modify your cylinder heads! BBC Head Casting Numbers.