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327 CHEVY ENGINE HP RATINGS

 
sled
I love my Chevy Chevette!
Posts: 2
Joined: 02/08
Posted: 02/15/08 09:09 PM

I have a 1962 327 that was originally a 300 HP that was removed from a 1962 Nova SS, that was wrecked. I want to know what is the difference between the 300 HP and the 365 HP versions of the engine.  I have changed the cam to the same unit is used in the 365 HP engine.. additionally I would like to know how to do an estimated horsepower rating based on the original engine rating with all the current modifications that I have done, which are bored .060 with 11 to 1 compression pistons, double hump heads (300 hp) cut .020 and ported, headers, Wieand Alum. HI-Rise Intake, (from 68 302 Z-28 engine), Holley 780CFM Dual Line Carb, roller rocker arms, and 365HP cam and solid lifters.  

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Pontiacman2
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Posted: 02/16/08 05:38 AM

Difference is the cam and as far as I have seen the 365HP came with 2.02/1.60 valves and the 300HP came with 1.94/1.50 valves.What is the casting numbers on the heads and do you know the size of the valves in the heads now.  
Pontiacman2
Pontiacman2

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Pontiacman2
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Posted: 02/16/08 05:39 AM

Difference is the cam and as far as I have seen the 365HP came with 2.02/1.60 valves and the 300HP came with 1.94/1.50 valves.What is the casting numbers on the heads and do you know the size of the valves in the heads now.Also what is the brand of the cam you are using.  
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Pontiacman2

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55Guy
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Posted: 02/19/08 10:36 AM

The other thing is, the 300 HP motor had a hydraulic cam, the 365 HP motor used a solid lifter cam.  

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sled
I love my Chevy Chevette!
Posts: 2
Joined: 02/08
Posted: 02/22/08 10:09 AM

I am not sure of the size Valves currently in the heads, But I will find out.  The Cam is a solid lifter TRW unit....and is supposed to be the closest thing to the cam used by GM in the 365 HP engine that TRW produces. I will reply back as soon as I have the Valve data, I do know the heads have been shaved .020, and ported....but not sure if the larger valves were installed at that time, these items were done before I purchased the engine.  

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JR.66
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Posted: 01/09/09 07:14 AM

wheres grumpy! he would know  

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cees86mcss
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Posted: 03/22/10 08:26 PM

xcuse me guys how do i go about posting a question concerning my problem  

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chev55sd
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Posted: 01/14/11 11:13 AM

365 HP 327 was a corvette only option in 1964-1965-the 365 was a 11-0 CR with gm highrise intake,ignition shield,larger rams horn exhaust headers,2.02 I 1.60 E valves,780 cfm carb,solid lifters,.485 lift I&E,small 62 cc combustion chambers-due to camshaft overlap be careful what fuel you use,these motors were designed and tested with leaded high octane gasoline available on evert street corner-as far as HP ratings go,the factories were always taking readings at different engine speeds to placate federal watchdogs-most of the numbers they came up with were overwhelmingly conservative. As far as HP numbers go,there is software available but the only way I know of to get accurate numbers is a dynamometer,which will be the toughest test your motor will ever recieve-I know because I have destroyed a race motor or two on the dyno!The best measuring tool I have ever used is the dragstrip-this will tell you everything you need to know-chassis dyno time is good for original setup (carb jetting,gear ratios,ignition advance or lack there of! Keep in mind that the dyno room is kept at a constant air pressure and temp so you dont have big altitude changes that affect your power numbers-my racing operation has encountered everything from -600 ft to over 11000 ft which grossly effects power and carb jetting  

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Ron1973
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Posted: 01/14/11 01:27 PM

OLD THREAD.  
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Pontiacman2
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Posted: 01/14/11 02:45 PM

Yep.  
Pontiacman2
Pontiacman2

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Ron1973
I have an SS396 tatoo
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Posted: 01/14/11 02:54 PM

did it once myself, don't tell anyone!!!  
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Pontiacman2
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Posted: 01/14/11 05:55 PM

I wont.  
Pontiacman2
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bigfellow1
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Posted: 03/27/11 03:25 PM

i have a 1968 327 original 11.1 compession slugs 10.10 crank speedpro L79 cam 461 62cc heads headers single plane victor jr intake 750 double pumper 1.5 roller rockers.I wonder if any one could tell me what kind of horse power this combo should make.  

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Ron1973
I have an SS396 tatoo
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Posted: 03/27/11 08:30 PM

WELCOME to Super Chevy bigfellow1 this is an old thread and you need to start your own thread anytime you have a question. Go up top of this page left side where it says Super Chevy under that it says featured cars and under that it says Forums, click on that...It will take ya to another page where you scroll down until you see General Discussion, under that is General, click on it and at the top on the right find "new topic" click on that and ask your question that way. thats how you start a thread, hopefully in the future it will be a little simpler but this is how its done for now, Hope this helps you, You should never ask a question in someone else s thread... Im just trying to save you some trouble telling you.. Good luck to ya, lots of car smart guys to help you. Ron..  
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