1969 chevelle 396 350 hp specs - Chevelle Tech
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post #1 of 19 (permalink) Old Aug 21st, 06, 5:50 PM Thread Starter
 
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1969 chevelle 396 350 hp specs

Hello, I am new here, just came over from the camaro site. I have a 1969 396 350hp engine from a chevelle (code is JC) I was wondering what is the difference in the motor compared to a 325 hp motor. thanks
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post #2 of 19 (permalink) Old Aug 21st, 06, 6:21 PM
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Talking Re: 1969 chevelle 396 350 hp specs

air cleaner decal extra 25 hp
The extra 25 hp
Carb is different I think and intake is different?
I have the same motor for my 69 vert, so I dont really know what else is different, someone else will chime in and tell us more.

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post #3 of 19 (permalink) Old Aug 21st, 06, 6:36 PM
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Re: 1969 chevelle 396 350 hp specs

Basically, the cam and valve springs were different, with minor differences in carburetor and distributor specifications. Intakes, heads, blocks, and pistons were the same. 350HP used same valve springs as 375HP.
Bruce

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post #4 of 19 (permalink) Old Aug 21st, 06, 7:01 PM
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Re: 1969 chevelle 396 350 hp specs

Air cleaner
325 hp was closed with snorkel, 350 hp was open element.
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post #5 of 19 (permalink) Old Aug 21st, 06, 7:01 PM
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Re: 1969 chevelle 396 350 hp specs

Quote:
Originally Posted by AZCamino
Basically, the cam and valve springs were different, with minor differences in carburetor and distributor specifications. Intakes, heads, blocks, and pistons were the same. 350HP used same valve springs as 375HP.
Bruce

that is 100% correct
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post #6 of 19 (permalink) Old Aug 21st, 06, 8:42 PM Thread Starter
 
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Re: 1969 chevelle 396 350 hp specs

Thanks alot, I didn't think there was a difference. Is the crank cast or steel. This is a 2-bolt block. If anyone is near Youngstown Ohio and needs this engine I would consider selling it to some one who really needs it.
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post #7 of 19 (permalink) Old Aug 21st, 06, 11:48 PM
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Re: 1969 chevelle 396 350 hp specs

It's probably cast.

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post #8 of 19 (permalink) Old Aug 22nd, 06, 6:04 AM
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Re: 1969 chevelle 396 350 hp specs

Quote:
Originally Posted by 68impala
Thanks alot, I didn't think there was a difference. Is the crank cast or steel. This is a 2-bolt block. If anyone is near Youngstown Ohio and needs this engine I would consider selling it to some one who really needs it.
There's the other difference. '69 350 hp has a forged crank vs a cast crank for the 325 hp.

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post #9 of 19 (permalink) Old Aug 22nd, 06, 7:35 AM
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Smile Re: 1969 chevelle 396 350 hp specs

AZCAMINO & DEAN ARE 100% correct.

FYI,i know for sure the 69 & 70 396/325hp & 350hp motors both had nodular iron cranks from the factory,396/375's had steel cranks.

Its the earlier like 1966-67 396/350hp & 360hp motors that had steel cranks (along with the 396/375hp & 1965 Z16 396/375hp.) and different intakes along with holleys not q-jets as mentioned in above post/s .

The only noteable difference between the 396/325hp & 350hp motors in 69 was the 350hp had an open element air cleaner,larger secondary metering rods,a more agressive hyd cam & better valve springs for higher rpm of 350hp cam,and a different ign timing curve in the distributor but they both had 10:25:1 compression.

The stock 325hp hyd cam had approx 198/198 deg int dur @.05,.398/.398 lift,114 or 115 deg L/S angle which was an extreemly mild cam for a 396. The 350hp cam was called the high lift/high perf hyd cam which had 214/218 deg int dur @.05,.461/.480 lift,115 deg L/S angle which was considerably more cam then the 325hp had but was still a mild cam.


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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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post #10 of 19 (permalink) Old Aug 22nd, 06, 12:45 PM
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Re: 1969 chevelle 396 350 hp specs

Quote:
Originally Posted by SWHEATON
AZCAMINO & DEAN ARE 100% correct.

FYI,i know for sure the 69 & 70 396/325hp & 350hp motors both had nodular iron cranks from the factory,396/375's had steel cranks.

Its the earlier like 1966-67 396/350hp & 360hp motors that had steel cranks (along with the 396/375hp & 1965 Z16 396/375hp.) and different intakes along with holleys not q-jets as mentioned in above post/s .

The only noteable difference between the 396/325hp & 350hp motors in 69 was the 350hp had an open element air cleaner,larger secondary metering rods,a more agressive hyd cam & better valve springs for higher rpm of 350hp cam,and a different ign timing curve in the distributor but they both had 10:25:1 compression.

The stock 325hp hyd cam had approx 198/198 deg int dur @.05,.398/.398 lift,114 or 115 deg L/S angle which was an extreemly mild cam for a 396. The 350hp cam was called the high lift/high perf hyd cam which had 214/218 deg int dur @.05,.461/.480 lift,115 deg L/S angle which was considerably more cam then the 325hp had but was still a mild cam.


Scott
All the references I have for '69's including the A.M.A. specs I received from Chevrolet as part of the restoration packet, show a forged crank for the 350 hp and cast nodular iron crank for the 325 hp. Before 1968, the 325 hp also had a forged crank.

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post #11 of 19 (permalink) Old Aug 22nd, 06, 1:22 PM
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Smile Re: 1969 chevelle 396 350 hp specs

My info comes from GM too but as we all know it's not uncommon to find conflicting info from the general,it happens from time to time.

But i also know this 1st hand from buying my chevelle in 1978 from the original owner when it was new with the #'s matching motor/drivetrain still in the car.

When i pulled the virgin motor (396/350hp)for it's 1st rbld ever it had a nodular iorn crank in it from the factory as i verified from the casting id too even though i could tell just by looking at the casting itself.

The machinest commented on how that nodualr iron crank was a good street unit because it was stronger then a std cast crank but was a little more flexable then a steel crank that was more ridged & prone to cracking if/when flexed.

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)
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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post #12 of 19 (permalink) Old Aug 22nd, 06, 8:34 PM Thread Starter
 
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Re: 1969 chevelle 396 350 hp specs

thanks again for all the info, I looked at the crank (while still in the motor) the only number I can see is 6223. Does that tell us anything?
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post #13 of 19 (permalink) Old Aug 22nd, 06, 8:55 PM
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Re: 1969 chevelle 396 350 hp specs

I believe that would be a forged crank. Funny, I have a 427 out of a 68 SS Impala in my car now.
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post #14 of 19 (permalink) Old Aug 22nd, 06, 10:23 PM
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Re: 1969 chevelle 396 350 hp specs

6223 is the most common forged crank. I have one that is a cross drilled 427 model but most are the non crossdrilled 396 type. Basically the only real difference between the motors is the cam. The valve springs are heavier and the jetting is different but is really just the cam.
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post #15 of 19 (permalink) Old Aug 23rd, 06, 10:18 AM
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Smile Re: 1969 chevelle 396 350 hp specs

According to the AC Delco manuals i have the 396/325hp (7029201 q-jet std trans) & 350hp (7029215 q-jet std trans) motors use the same primary jets & rods (71's/45b rods),the only difference is the secondary metering rds,BC for 325hp & AX for 350hp.

The AX sec rods used in the 350hp motor have a much thinner tip and are richer then the BC rods used in the 325hp motor.

The 25 additional hp in the 350hp motor comes from a combination of a more aggressive cam profile & better valve springs for higher rpm potential,richer sec rods,open element air cleaner,and a different ign timing curve in the dist .

Scott

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)

Last edited by SWHEATON; Aug 23rd, 06 at 10:34 AM.
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