Whats the HP in my 327? - Impala Tech
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post #1 of 8 (permalink) Old 12-11-2007, 10:37 PM Thread Starter
 
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Whats the HP in my 327?

Can someone please tell me how I can tell if my 1965 Bel Air 327 has 250 or 300 HP? Thanks all
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post #2 of 8 (permalink) Old 12-12-2007, 09:51 AM
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The 250 hp had a Rochester 4GC carb. The 300 hp had the Carter AFB which is cloned now as the Edelbrock so it is easy to compare. There are several other differences, but this should be quick.
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post #3 of 8 (permalink) Old 01-23-2008, 03:54 PM
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Originally Posted by cmy65wagon View Post
Can someone please tell me how I can tell if my 1965 Bel Air 327 has 250 or 300 HP? Thanks all

If the engine code stamped on your engine pad is HA or HC, it is the 250HP (RPO L30). HA is manual trans and HC is powerglide. Also, if it is HB or HD, it is the RPO L74 300hp option. HB is manual trans and HD is powerglide.

Warren
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post #4 of 8 (permalink) Old 01-23-2008, 05:32 PM
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The 300 horse had a solid cam, and the 250 horse was equipped with a hydraulic cam as I recall.

Big Dave
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post #5 of 8 (permalink) Old 01-23-2008, 06:26 PM
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I'm not 100% sure but I believe 65 was the same as 66 and the only 327 available was the 275 h.p. It was 275 h.p @4800 rpm, 355 ft.lb. @3200 rpm with a 10.5 :1 compression ratio. It was equipped with a 4 barrel. I don't know if it was a Rochester or Carter.
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post #6 of 8 (permalink) Old 01-24-2008, 03:22 PM
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The '65 was built with both 250 and 300 hp engines and both had hydraulic cams.
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post #7 of 8 (permalink) Old 01-24-2008, 08:48 PM
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I stand corrected. I guess they decided to split it down the middle in 66 LOL!
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post #8 of 8 (permalink) Old 01-25-2008, 08:36 PM
 
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327 / 250 is low compression (8.75:1), small valve (1.74 / 1.50), 929 (standard hydraulic) camshshaft. 327/300 was high compression (10:1), 461 camel hump heads (1.94 /1.5), 929 camshaft (standard hydraulic) camshaft, & dual exhaust. 327/275 Is same as 300hp, but with the dual exhaust as an option.
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