Can anybody tell me what this is?

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JayO313

Not-quite-so-new-guy
Mar 21, 2016
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I have 357 sbc, when i bought it it had this tag on it, Can anybody tell me what this is??, ... im still a novice when it comes to working on motors.. I think its my vavle size but not sure..
 

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565bbchevy

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Aug 8, 2011
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Do you have any other specs for your engine?
Are these factory GM cast iron heads? And if so do you have a casting number?
 

JayO313

Not-quite-so-new-guy
Mar 21, 2016
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Do you have any other specs for your engine?
Are these factory GM cast iron heads? And if so do you have a casting number?
I believe its a 84-86 350 engine, when i researched the block number, it said it either came from c10 pickup or camaro. They are factory heads, i dont have the casting number with me
 

ssn696

Living in the Past
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Jul 19, 2009
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Look for a casting number. 7 or 8 digits, under the valve cover. 2.02/1.60 was the largest stock intake/exhaust valve size. 75.5 = 76cc chambers. The big valves are good for making power above 2500 RPM. These heads are for the larger small blocks, 350/400.
 

JayO313

Not-quite-so-new-guy
Mar 21, 2016
21
0
1
Look for a casting number. 7 or 8 digits, under the valve cover. 2.02/1.60 was the largest stock intake/exhaust valve size. 75.5 = 76cc chambers. The big valves are good for making power above 2500 RPM. These heads are for the larger small blocks, 350/400.
Thanks for the info
 

ssn696

Living in the Past
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The casting number can tell you more about how smoggy they are. Modern Vortecs outflow almost all small block heads, but there are tradeoffs when using them. I'll withhold comment until your heads identify themselves.
 

JayO313

Not-quite-so-new-guy
Mar 21, 2016
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0
1
Ill will get back with you guys when i get to my car. I know i am going to end up rebuilding the top end but i want to get an idea of how much hp im puttin out now
 
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