275 hp vs 325 hp 327 - Chevelle Tech
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post #1 of 12 (permalink) Old Apr 17th, 07, 3:18 PM Thread Starter
 
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275 hp vs 325 hp 327

Can anyone tell me what was different in a 325HP 327 to boost the HP over the standard 275HP 327 for the 66 Chevelle?? Thanks in advance.
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post #2 of 12 (permalink) Old Apr 17th, 07, 3:20 PM
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Re: 275 hp vs 325 hp 327

325 HP 327 used the 327/350 HP L79 cam


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post #3 of 12 (permalink) Old Apr 17th, 07, 4:14 PM
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Re: 275 hp vs 325 hp 327

larger cam , 202 valves, different carb , different Intake ,higher comp , Stick shift only 4 speed, duel exs system , thats pretty much it ....

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post #4 of 12 (permalink) Old Apr 17th, 07, 5:09 PM
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Re: 275 hp vs 325 hp 327

Quote:
Originally Posted by 68KMENO View Post
larger cam , 202 valves, different carb , different Intake ,higher comp , Stick shift only 4 speed, duel exs system , thats pretty much it ....
Oh is that all

9 years and FINALLY she's drivable, just in time for my first born son.
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post #5 of 12 (permalink) Old Apr 17th, 07, 6:17 PM
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Re: 275 hp vs 325 hp 327

Ron .....
don't take my first post to mean you need to change everything to get to 325 hp
thats what was different back in the day when it was made........
if your looking for easy HP in a 327 start by putting on headers then intake & carb as you'll get the most return on you money
after that its a toss up ... cam & springs or Ing....your looking for RPM
believe me these little motors can & do run real well
its all in matching the combo

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post #6 of 12 (permalink) Old Apr 17th, 07, 8:33 PM
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Re: 275 hp vs 325 hp 327

I have a buddy that was running mid 10's in his 65 'velle with a 327, he was squeezing though, but he never had a problem with it.

9 years and FINALLY she's drivable, just in time for my first born son.
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post #7 of 12 (permalink) Old Apr 17th, 07, 8:35 PM
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Re: 275 hp vs 325 hp 327

I think that the L79 had all forged bottom end pieces as well.
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post #8 of 12 (permalink) Old Apr 17th, 07, 10:42 PM
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Smile Re: 275 hp vs 325 hp 327

The 327hp/327 was just an L-79, 350hp/327 w/ a Q-Jet on it if not mistaken.

I missed this back in Oct. '66 or I woulda had a '67 Duece Coupe w/ one in it and a car ordered like my '67 350SS/RS Camaro car.

I really wanted the '66, L-79, but they stopped production of it in '66. One year only car!!

I probably woulda installed a good old 3310-1, 780cfm Holley on Holley's 300-36 high-rise dual plane intake, a set of cheap headers and an Isky Z-30 solid lifter cam and went and had waaay more fun than the LAW would allow!!

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post #9 of 12 (permalink) Old Apr 18th, 07, 10:57 AM
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Re: 275 hp vs 325 hp 327

It depends on the year of L-79. The last year they produced them (1968) they had painted cast iron intakes and Q-jet carbs, whereas earlier ones had natural aluminum intakes and Holley carbs. All L-79s had closed PCV systems from '65 - '68. L-30s typically had open PCV systems unless they were California emission or '68 versions.

While the 327s were small journal, they all came with forged cranks & 2-bolt mains. Only in '68 did they switch to large crank and rod journals (still 2-bolt though). The larger journal versions may have had cast vs. forged cranks on the 275 vs. 325 horse versions. No matter which though, I think the L-79 had stronger rods than the L-30 (275 horse). It may just have been in additional preparation though.

As was mentioned by others, 10:1 vs. 11:1 compression via pistons, plus 2.02 vs. 1.94 intake valves; 1.60 vs. 1.50 exhaust valves, plus the excellent hydraulic lifter L-79 cam.

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the more you realize there is that you don't know." - Dad


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post #10 of 12 (permalink) Old Apr 18th, 07, 9:21 PM
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Re: 275 hp vs 325 hp 327

I'm here ta say that a stock '66, L-79 Duece Coupe w/ a 4-speed and 3.73 posi- ran like the WIND!!!

Suckers would take on much bigger iron back then and NEVER look back!!!

That's why I wanted one!!!

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post #11 of 12 (permalink) Old Apr 18th, 07, 10:03 PM
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Re: 275 hp vs 325 hp 327

A friend's '68 L79 Chevelle had no problem with L34 396s. I saw it in person. A local '66 L79 Chevy II really laid a beating on the L34 cars. The L79 with the Quadrajet was THE sleeper. They looked like and L30 and the exhaust wasn't all that radical either. You could really fool people with one of these.
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post #12 of 12 (permalink) Old Sep 7th, 07, 9:58 PM
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Re: 275 hp vs 325 hp 327

nice. i cant get enuff of 327s.
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