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  #1  
Old Apr 16th, 06, 9:35 PM
bradford bradford is offline
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william
 
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Question 396 horsepower rating?

i did some searching but didn't find any info that helped. i am purchasing what i believe is a 396 out of a 68 chevelle ss 396, i know the history of the motor, the car was wrecked when new and the motor put in a 68 chevy pickup. the motor has chrome valve covers and air cleaner lid. has quadrajet carb, i don't have engine numbers yet. it is complete, smog, air cond. power steering. any way to tell if it is a 325 or 350 horse motor? also what cam would be correct for each? or close to in new cam technoligy? thanx
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  #2  
Old Apr 17th, 06, 12:23 AM
SWHEATON SWHEATON is offline
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Smile Re: 396 horsepower rating?

THE ONLY DIFFERENCE BETWEEN THE 396 325 & 350 HP MOTORS in 68 WAS THE CAM.

GM put what they called was the high lift high perf hyd flat tappet cam in the 350hp motor.

The stock GM L35 396/325hp cam had approx 198/200 deg dur @.05,.398/.398 lift,114 Deg L/S angle.

The stock L34 396/350hp cam had 214/218 deg dur @.05,.461/.480 lift,115 deg L/S angle which was still a very mild cam for a BBC and had last 3 digets of 986 in the pt#. I sold an NOS GM L34 396/350hp 986 cam on ebay in the original contaner for $250.

You can look to see what the code is stamped on the pad in front of the pass side head that will tell if its a 325 or 350hp motor if the block has never been decked durring a rbld.

The casting # on the rear of the block is the same for both motors so you cant go by that.

There are blue print copies of these cams by comp & crane but its crazy to use that 40yr old tech . There are much better profiles out there today that will far out power thoses old cam designs and still idle well and have good dirieability to boot.

Scott
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1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
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  #3  
Old Apr 17th, 06, 1:39 AM
136679ss 136679ss is offline
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Default Re: 396 horsepower rating?

Well I can say one thing for sure, if it came with factory air it isn't an L78
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Old Apr 17th, 06, 5:23 AM
Junkyard Dawg Junkyard Dawg is offline
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Dave
 
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Default Re: 396 horsepower rating?

Quote:
Originally Posted by SWHEATON
THE ONLY DIFFERENCE BETWEEN THE 396 325 & 350 HP MOTORS in 68 WAS THE CAM.
That wasn't the only difference was it? Didn't the 350 hp 396 also use a forged crank???
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  #5  
Old Apr 17th, 06, 8:09 AM
SWHEATON SWHEATON is offline
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Smile Re: 396 horsepower rating?

I kmow the 396/350hp in 69 cam with a nodular iron crank but i know the 350 & 360hp came with the steel crank in 66,67, and from what i remember reding was either dropped for 68 and was dropped sometime in 68.

some of the early 396 350 or 360 hp motors had a holley and not a q-jet but i thinlk it was the only on the 360hp in 66-67.

But other than that the cam was the only differene between the 325 & 350hp 396's.

I got the impression from the original post you were looking for the main internal differences between the 396 350 & 360 hp which is why i did not mention the holley vs q-jet in my earlier post an that i thought they dropped the steel crank in 68. But it may have been late 68 and i know for sure they used nodular iron for the 396/350 in 69 & 70 becasue i have an original #'s matching 69 396 and i have read also read that used nodualr iron in 69-70 for the 325 & 350hp 396's.

Scott
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SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
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  #6  
Old Apr 17th, 06, 8:37 AM
bradford bradford is offline
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william
 
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Thumbs up Re: 396 horsepower rating?

thanx everyone, i will get the numbers off the block and post them this week.
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1968 chevelle malibu 454 th400
1981 firebird formula
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