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Username Post: 1964 327 Valve size question        (Topic#372669)
some bloke 
Newbie
Posts: 34

Loc: Edinburgh, Scotland
Reg: 06-28-21
02-28-23 12:38 PM - Post#2855185    

Hi there, I normally hang out in the 65/65 B-Body forum, but I was wondering if anyone can tell me, did all 64 327's in a Corvette had the double bump heads with 2.02" inlet valves? Or were the lower hp 327s fitted with smaller valve heads? TIA.

Brendan - 1966 Impala Sports Sedan


 


Tony1963 
Frequent Contributor
Posts: 2072

Loc: Orlando Florida
Reg: 07-09-18
02-28-23 01:32 PM - Post#2855186    
    In response to some bloke

Lots of good discussion here.

https://www.corvetteforum.com/forums/c1-and-c2-cor...

People fear change because it threatens what they know, or what they claim to know.


 
some bloke 
Newbie
Posts: 34

Loc: Edinburgh, Scotland
Reg: 06-28-21
03-01-23 12:11 AM - Post#2855197    
    In response to Tony1963

Thanks Tony.

Brendan - 1966 Impala Sports Sedan


 
Tony1963 
Frequent Contributor
Posts: 2072

Loc: Orlando Florida
Reg: 07-09-18
03-01-23 04:51 AM - Post#2855199    
    In response to some bloke

What I found most interesting is that there is no unique casting for 2.02 vs 1.94 valves. The valve size is determined by machining the casting.

The subject of the larger valves has been discussed at length over the years. The increased airflow that is possible has to be properly tuned in the rest of the engine to make any difference.

I was always happy with the 1.94 valves, however, do what is in your vision.

People fear change because it threatens what they know, or what they claim to know.


 
some bloke 
Newbie
Posts: 34

Loc: Edinburgh, Scotland
Reg: 06-28-21
03-01-23 08:38 AM - Post#2855206    
    In response to Tony1963

It was an interesting read - the subject came up because there was a 64 Corvette on Ebay in the UK, it seemed to have later heads (with accessory bolt holes) but that got me wondering, did all Corvette engines in 64 have the 202 valves, or only the fuelie ones, and were the fuelie heads used on all corvettes? I didn't know they used 194 valves. Thanks again for the reply.

Brendan - 1966 Impala Sports Sedan


 
japete92 

Posts: 2092
japete92
Loc: No. Virginia
Reg: 01-18-13
03-15-23 10:47 AM - Post#2855826    
    In response to some bloke

  • some bloke Said:
It was an interesting read - the subject came up because there was a 64 Corvette on Ebay in the UK, it seemed to have later heads (with accessory bolt holes) but that got me wondering, did all Corvette engines in 64 have the 202 valves, or only the fuelie ones, and were the fuelie heads used on all corvettes? I didn't know they used 194 valves. Thanks again for the reply.



Here's link to some reliable info:

https://www.gm.com/content/dam/company/n o_search/h...

Just trying to be helpful.

Pete



 
Tony1963 
Frequent Contributor
Posts: 2072

Loc: Orlando Florida
Reg: 07-09-18
03-19-23 06:47 AM - Post#2855915    
    In response to some bloke

Keep in mind that whatever dollars you invest into flowing more air in needs to be able to flow that same air out.

When you consider that you have a minimal gain with those 2.02 valves, will your exhaust ever be able to actually flow that air or will it be capable?

People fear change because it threatens what they know, or what they claim to know.


 


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