atximpalas
Forum Newbie
Posts: 10
Reg: 07-31-10
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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: 1058
Loc: Birmingham AL
Reg: 10-11-08
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09-28-10 03:48 PM - Post#1982069
In response to atximpalas
They will bolt right up.
1964 Chevrolet Impala SS 327 Powerglide
1981 Ford Granada 3.1 L (200 inline 6)
1985 Chevrolet Suburban C20 454 Turbo 400
1999 Mercedes E300
2008 Mercedes E350
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atximpalas
Forum Newbie
Posts: 10
Reg: 07-31-10
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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. |
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doubleE
Valued Contributor
Posts: 3688
Loc: Eagan MN
Reg: 06-02-03
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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 |
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 wagonmaster
Moderator
Posts: 8008
Age: 64
Loc: Loganville, Ga.
Reg: 04-28-00
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 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!!
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Mad Joe
Contributor
Posts: 391
Loc: Wichita Falls, Tx.
Reg: 05-09-07
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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.
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models916
Frequent Contributor
Posts: 1879
Age: 62
Loc: Addison, IL
Reg: 05-28-10
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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.
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 62BillT
"11th Year" Silver Supporting Member
Posts: 4626
Loc: Moneta, VA
Reg: 09-24-01
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09-29-10 11:21 AM - Post#1982451
In response to models916
Not all the double humps were 2.02 valves. Some were smaller.
Right, they were 1.94's.
Member:
-National Impala Association
-Vintage Chevrolet Club of America
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 jdk
"3rd Year" Silver Supporting Member
Posts: 318
Age: 63
Loc: columbus, ohio
Reg: 02-15-10
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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
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atximpalas
Forum Newbie
Posts: 10
Reg: 07-31-10
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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. |
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atximpalas
Forum Newbie
Posts: 10
Reg: 07-31-10
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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. |
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 Dave64SS
"4th Year" Gold Supporting Member
Posts: 1470
Loc: Cypress, TX
Reg: 02-28-09
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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.
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Richard Martin
Valued Contributor
Posts: 4319
Loc: Davis Islands, Florida
Reg: 06-12-03
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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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