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Username Post: 327 double hump heads        (Topic#289368)
rickey1964 
Contributor
Posts: 160

Loc: Calhoun, Georgia
Reg: 04-07-11
11-09-12 03:34 PM - Post#2287662    

Without taking the valve covers off to find the code....I am on the road working....can someone post a pic of what the double humps casting look like on the heads....my stepfather thinks I have the high performance heads while my father thinks otherwise. I have pics but don't know how to post them here. Engine is a d#mn good one regardless.

Edited by rickey1964 on 11-09-12 03:45 PM. Reason for edit: No reason given.

 
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WagonMan 
"4th Year" Silver Supporting Member
Posts: 1435
WagonMan
Age: 66
Loc: SW Kansas
Reg: 10-26-04
11-09-12 04:17 PM - Post#2287669    
    In response to rickey1964

Compare here.

http://www.fastnuf.com/Headguide.html

Charles

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Richard Martin 
Dedicated Enthusiast
Posts: 5072

Loc: Davis Islands, Florida
Reg: 06-12-03
11-09-12 04:19 PM - Post#2287670    
    In response to rickey1964

http://www.google.com/imgres?q=chevy+double +hump+h...

Richard

 
rickey1964 
Contributor
Posts: 160

Loc: Calhoun, Georgia
Reg: 04-07-11
11-09-12 09:41 PM - Post#2287738    
    In response to WagonMan

Going by your chart I don't have the double hump heads(E,F)but 'D'. I am not disappointed in the least.

I already knew I had a 283 block but thought I had 327 heads. To see what they really are is pretty exciting for me.

 
rickey1964 
Contributor
Posts: 160

Loc: Calhoun, Georgia
Reg: 04-07-11
11-09-12 10:10 PM - Post#2287743    
    In response to Richard Martin

That is exactly as Dad described them. Thanks

 
wagonmaster 
Senior Member
Posts: 8315
wagonmaster
Age: 65
Loc: Loganville, Ga.
Reg: 04-28-00
11-11-12 05:43 AM - Post#2288059    
    In response to rickey1964

Good Ol' Dad! The 2.02 heads can have problems with the small 3 7/8" 283 bore. Thw 1.94s are fine.
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DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
11-11-12 08:15 AM - Post#2288100    
    In response to rickey1964

The E and F symbols are totally incorrect!
The two humps should be rounded (as seen in the link posted by Richard Martin), NOT squared off!
The double hump heads were cast and machined in several versions. Without removing the valve covers, it is nearly impossible to determine which version of the double hump head is on an engine. Absolutely NONE of the double hump heads can be identified simply by looking at the double hump symbol. Furthermore, the BARE head casting was used for producing EITHER the 1.94/1.5 or the 2.02/1.6 valve version. The difference between them is simply the machining process that was done.
The very first year for a double hump head was 1961 (315hp/283 fuel injected Corvette ONLY). The last year was 1968. There were double hump heads (such as symbol H) in 69-later, but those heads had additional raised bosses and threaded holes for attachment of accessory brackets such as for the alternator. The last year for heads with "plain" ends was 1968. Also, the 68 heads (any version) were somewhat unique because it was the last year for the plain ends, BUT the first year for the threaded hole in the side for the temp sending unit (which moved from the intake manifold to the head in all 68 engines---------------inc luding big blocks).
Tom Parsons


 
Richard Martin 
Dedicated Enthusiast
Posts: 5072

Loc: Davis Islands, Florida
Reg: 06-12-03
11-11-12 09:01 AM - Post#2288119    
    In response to DZAUTO

"The very first year for a double hump head was 1961 (315/283 Fuel Injected Corvette ONLY)"

Tom didn't the 1961 hyd. lifter fuel injected Corvette engine also have the new "double hump" head? That is why the horsepower was increased to 275 horsepower.

1961 Corvette engines:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

I sent a pm to to ricky 1964 yesterday telling him that it would be helpful to have the head casting # to determine what the head really is.

Richard

 
paintman 
"2nd Year" Silver Supporting Member
Posts: 242
paintman
Loc: Smoky Mts., Tenn.
Reg: 02-27-12
11-11-12 06:08 PM - Post#2288244    
    In response to WagonMan

Thanks for sharing the chart with us. Truly a valuable document to have on file.

Regards,

Rich
Rich



1962 Chevy Impala Convertible 283 Auto
1964 Impala SS Coupe 327 250 Auto


 
rickey1964 
Contributor
Posts: 160

Loc: Calhoun, Georgia
Reg: 04-07-11
11-11-12 09:39 PM - Post#2288311    
    In response to DZAUTO

I will get to removing the valve covers asap to get the numbers. Right now though I am on the road. By the way the heads have chrome valve covers but I want to go back to the orange covers with the 'Chevrolet' script. Maybe I will be able to do both at once.

 
DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
11-11-12 11:09 PM - Post#2288327    
    In response to Richard Martin

  • Richard Martin Said:
"The very first year for a double hump head was 1961 (315/283 Fuel Injected Corvette ONLY)"

Tom didn't the 1961 hyd. lifter fuel injected Corvette engine also have the new "double hump" head? That is why the horsepower was increased to 275 horsepower.

1961 Corvette engines:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

I sent a pm to to ricky 1964 yesterday telling him that it would be helpful to have the head casting # to determine what the head really is.

Richard



Yep, that is exactly correct. I SHOULD have said 275 and 315hp/283, OR, just said 61 Corvette FI engines. Either way, in 61, ONLY the Corvette engines had double hump heads and they were ONLY on FI engines. Thus, the origin of the term "fuelie heads", which has stuck forever. After 61, any 300hp and higher 327 engine got double hump heads. Actually, there would have been MANY more engines with double hump heads that DID NOT have FI than there were with FI.
Tom Parsons


 
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