67 L30 327 head? - Team Camaro Tech
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post #1 of 12 (permalink) Old Mar 11th, 19, 08:59 AM Thread Starter
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67 L30 327 head?

What cast markings did the heads have on the fronts?

double hump or?
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post #2 of 12 (permalink) Old Mar 11th, 19, 09:34 AM
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Re: 67 L30 327 head?

The 1967 L30 (327/275) head used either the 3890462 (early) or the 3917291 (late) with 1.94" intake and 1.50" exhaust valves. Both heads used the double hump symbol.

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post #3 of 12 (permalink) Old Mar 11th, 19, 10:09 AM Thread Starter
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Re: 67 L30 327 head?

Did the 462's also have 1.94/1.50 valves?
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post #4 of 12 (permalink) Old Mar 11th, 19, 10:44 AM
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Re: 67 L30 327 head?

There were 3 different xxxx462 heads manufactured from 62-67. You need to know
what full casting number you have. See the chart about 1/3 of the way down this page.
https://www.enginelabs.com/engine-te...ads-to-gen-iv/

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post #5 of 12 (permalink) Old Mar 11th, 19, 11:00 AM
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Re: 67 L30 327 head?

Quote:
Did the 462's also have 1.94/1.50 valves?
I'm assuming you mean the 3890462 heads, and yes, they came with either 2.02 or 1.94 intakes depending on what engine they were being installed on.

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post #6 of 12 (permalink) Old Mar 14th, 19, 08:38 AM Thread Starter
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Re: 67 L30 327 head?

Was there a cam spec difference between the 210 hp 327 and the L30 327 that had 275?
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post #7 of 12 (permalink) Old Mar 14th, 19, 08:43 AM
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Re: 67 L30 327 head?

Quote:
Was there a cam spec difference between the 210 hp 327 and the L30 327 that had 275?
Nope. The same cam (P/N 3896929, casting number 3896930) was used on the 1967 283/195, 327/210, 327/275, 327/300 and 350/295).

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post #8 of 12 (permalink) Old Mar 14th, 19, 08:43 AM
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Re: 67 L30 327 head?

Quote:
Originally Posted by SoCal805 View Post

Was there a cam spec difference between the 210 hp 327 and the L30 327 that had 275?

3896929 camshaft was used for both of them. (Edged out by a nose..... )

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post #9 of 12 (permalink) Old Mar 14th, 19, 09:06 AM Thread Starter
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Re: 67 L30 327 head?

So the 65 hp increase was all in the heads. The 1.94/1.5 double humps vs the 2.02/1.6?

I would have thought a different cam that made more power in higher RPM

Interesting it was the same cam in 283-350 motors
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post #10 of 12 (permalink) Old Mar 14th, 19, 09:30 AM
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Re: 67 L30 327 head?

No 202's on L30's, just more compression and a bigger carb.

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post #11 of 12 (permalink) Old Mar 14th, 19, 09:34 AM
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Re: 67 L30 327 head?

Heads, yes, but not what you stated.

The heads on the LF7 (327/210) used 1.72"/1.50" valves and a Combustion Chamber volume of 75.340cc.

The heads on the L30 (327/275) used 1.94"/1.50" valves and a combustion chamber of 63.305cc.

The larger valves on the L30 increased breathing, but more importantly, the smaller cc size raised the compression ratio from 8.75:1 (327/210), to 10.00:1 (327/275).

Same block, same pistons, same cam, but the increased compression ratio of the L30 heads made the difference.

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post #12 of 12 (permalink) Old Mar 14th, 19, 09:45 AM Thread Starter
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Re: 67 L30 327 head?

So the 65 hp increase was all in heads (valve size and tighter chamber for more compression)

I have a Gen 2 LT1 in a 96 Impala (it's a 383 AL head/T56 car now). Everything Chevy made 94-96 came with a LT1 but the cam & heads were different between models. B body's got the iron heads with a cam designed to make more low end TQ 260 hp. F body got the aluminum heads and a cam that made a little more power in the upper RPM's and also "slightly" higher compression 270 hp. The Y body also got aluminum heads and a slightly more aggressive cam, 4 bolt mains and made 300 hp (of course GM needed to keep the Vette at the top of the pack)

Interesting GM did it all with heads and carburation on otherwise identical short blocks/cams for the Gen 1 motors
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