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Username Post: 327 heads on a 283        (Topic#249962)
atximpalas 
Forum Newbie
Posts: 10
atximpalas
Reg: 07-31-10
09-28-10 03:00 PM - Post#1982052    

Will a set of 327 (2.02 valve) heads fit on a 283 that has been bored out 60 over? If so, are there any mods that must be done to make them work? Thanks.
62 Impala SS 4 Spd.
63 Impala SS 327/300 4 Spd.
Second owner on both cars.


 
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tony1963 
Frequent Contributor
Posts: 1206

Loc: Birmingham AL
Reg: 10-11-08
09-28-10 03:48 PM - Post#1982069    
    In response to atximpalas

They will bolt right up.
1964 Chevrolet Impala SS 327 Powerglide (SOLD!)
1981 Ford Granada 3.1 L (200 inline 6) (SOLD!)
1985 Chevrolet Suburban C20 454 Turbo 400
1999 Mercedes E300 (SOLD!)
2008 Mercedes E350
2012 Mercedes S550



 
atximpalas 
Forum Newbie
Posts: 10
atximpalas
Reg: 07-31-10
09-28-10 05:16 PM - Post#1982096    
    In response to tony1963

Thanks, I was told there may be clearance problems with the valves and the cylinder walls. Thanks for the info.
62 Impala SS 4 Spd.
63 Impala SS 327/300 4 Spd.
Second owner on both cars.


 
doubleE 
Valued Contributor
Posts: 3804
doubleE
Loc: Eagan MN
Reg: 06-02-03
09-28-10 06:02 PM - Post#1982123    
    In response to atximpalas

Yes they will bolt up but I wouldn't do it. I put a set of camel humps on my 283 and performance went in the toilet. The 283 doesn't have enough displacement to make the larger valves flow. Kind of the same result when you put too large of a carb for an engine.

You would be much better off using a set of power-pack heads. These use the same valve size of the standard 283 heads but have the smaller combustion chamber (higher compression ratio) of the camel humps. Chevy used these on the HP 283s and the 250 hp 327s.

Eric
Proud owner of My Blue 62 Impala SS


 
wagonmaster 
Senior Member
Posts: 8372
wagonmaster
Age: 65
Loc: Loganville, Ga.
Reg: 04-28-00
09-29-10 04:42 AM - Post#1982298    
    In response to doubleE

With a +.060 motor (292) you may still have block to valve clearance issues. The 301/302 (283 +.125") will clear, barely. The big valve heads will help the small motor IF you have enough camshaft and intake/carb to back it up. (Remember the 1967-69 Z-28??) You'll need to take it to +.125 over if it will go that far safely. The older 283 was never a problem with that, later models need to be checked before you bore tham that far.
Good luck!

P.S.
This is too small a motor for a big car, in my opinion. I had one in a '58 and it would run, but only with a stiff gear to keep it buzzed up!!
Hey T @!


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Joe


 
Mad Joe 
Contributor
Posts: 418
Mad Joe
Loc: Wichita Falls, Tx.
Reg: 05-09-07
09-29-10 09:18 AM - Post#1982401    
    In response to wagonmaster

30 years ago I had a 56 Nomad and put the double hump heads put on a 283, or maybe even a 265. Had no clearance problems but the car would fall on it's face. Put 4:11 gears in rear and it ran strong.

 
models916 
Valued Contributor
Posts: 3065

Age: 63
Loc: Addison, IL
Reg: 05-28-10
09-29-10 10:25 AM - Post#1982427    
    In response to Mad Joe

Not all the double humps were 2.02 valves. Some were smaller.

 
62BillT 
"13th Year" Silver Supporting Member
Posts: 4984
62BillT
Loc: Moneta, VA
Reg: 09-24-01
09-29-10 11:21 AM - Post#1982451    
    In response to models916

  • models916 Said:
Not all the double humps were 2.02 valves. Some were smaller.



Right, they were 1.94's.
Member:
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-Vintage Chevrolet Club of America


 
jdk 
"4th Year" Silver Supporting Member
Posts: 359

Age: 64
Loc: columbus, ohio
Reg: 02-15-10
09-29-10 05:06 PM - Post#1982565    
    In response to 62BillT

do not sell the 1.94 short. remember the 63 vette had those in their 340 and 360 fi heads. jim

all engines need to be set up with corresponding parts. i am no mechanic or work in a machine shop,
but you don't just throw parts together and expect a 7 second vehicle. jmho jim

 
atximpalas 
Forum Newbie
Posts: 10
atximpalas
Reg: 07-31-10
10-04-10 10:55 AM - Post#1984597    
    In response to jdk

Thanks for all the info. The engine was rebuilt by my Dad before he passed away so I can't ask him about it. It is bored .60 over with a mild cam. Think I may try a Performer intake and go up to a 600cfm from the 500 on it now. Any thoughts?
62 Impala SS 4 Spd.
63 Impala SS 327/300 4 Spd.
Second owner on both cars.


 
atximpalas 
Forum Newbie
Posts: 10
atximpalas
Reg: 07-31-10
10-04-10 11:07 AM - Post#1984601    
    In response to atximpalas

How do I know if the car has power pack heads? I was told that it does. The heads have a single triangle pointing up.
62 Impala SS 4 Spd.
63 Impala SS 327/300 4 Spd.
Second owner on both cars.


 
Dave64SS 
"5th Year" Gold Supporting Member
Posts: 1655
Dave64SS
Loc: Cypress, TX
Reg: 02-28-09
10-04-10 11:46 AM - Post#1984613    
    In response to atximpalas

yup...the triangle with be the casting for "power-pack". the double hump looks somewhat like two camel humps..but spread apart a bit.

 
Richard Martin 
Dedicated Enthusiast
Posts: 5148

Loc: Davis Islands, Florida
Reg: 06-12-03
10-04-10 04:11 PM - Post#1984724    
    In response to Dave64SS

The 1961 Corvette Fuel Injected 283 engines (275 & 315 horsepower) had iron 1.94/1.50 valve heads. An aluminum version of the 1.94/1.50 head was to be released for the 1960 F.I. Corvette engines but due to casting problems only 15 or so Corvettes were actually built with the aluminum head. Some Corvette experts claim no '60 Corvettes with the aluminum 1.94/1.50 heads were sold retail to any customers...all the '60s still had the 1959 and earlier 1.72/1.50 head.

Richard

 
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