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Does someone have information on the 300 HP 327 motor...The original specs, cam, heads, etc. What was different about this HP that other versions. Thanks guys...
 

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300 specs

As I recall the 300 didn't have the big valve heads or mechanical lifters like the 340,365 or 375 H.P. versions. also had lower compression not the 11 to 1 of the H.P. engines. I believe it also had the same camshaft as the 250 H.P. engines. i hope my memory isn't to far off.
 

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Thanks 56, That is what I want to know. What made the 300 different from the 250, and other versions...thanks..
 

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If I remember right the 250hp had the 1.94 heads and the 300hp had the 2.02 heads and a different camshaft. Did the 300 hp have a Carter or was it a Holley carb? Dang my memory aint what it used to be, I used to know this stuff.
 

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250 hp = 1.72" intake valves (same as 283 power pack) and a small 4 bbl carb (WCFB or Rochester), small cam, 10:1 compression

300 hp = 1.94" intake valves, Carter AFB carb, everything else same as 250 hp

340/365 hp = 2.02" intake valves, aluminum manifold, Holley carb, Duntov 30/30 cam, 11:1 compression

360/375 hp = 2.02" intake valves, Rochester fuel injection, Duntov 30/30 cam, 11:1 compression

350 hp = 2.02" intake valves, aluminum manifold, Holley carb, special hydraulic lifter cam, 11:1 compression

275 hp = 1.94 intake valves, Quadrajet carb, small cam, 10:1 compression

210 hp = 1.72 intakes, 2 bbl carb, low compression
 

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There we go, I knew the heads were different but had forgotten about the really small valve heads. Thanks to Rick
 

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Good recap Rick :):tu
 

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340/365 hp = 2.02" intake valves, aluminum manifold, Holley carb, Duntov 30/30 cam, 11:1 compression....

I love this engine :party0031: :tu
 

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The main difference in the early version of the 250 and 300 horse 327 engines was that the 250 had the 520 head with small valves and the Rochester 4GC carb. The 300 had the 461 head with 1.94 intake valves, a better manifold, (iron), and the Carter AFB carb. I'm pretty sure both engines shared the .398 lift hydraulic camshaft.
 

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The 300 hp 327 had a 390/410 lift cam similar to the old 265 pp cam that was used in standard production 283-350 SBCs for the next 20 years.
 

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The 300 hp 327 had a 390/410 lift cam similar to the old 265 pp cam that was used in standard production 283-350 SBCs for the next 20 years. Yhe intake had an AFB bolt pattern with larger bores than WCFB.
 

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The 327/300 hp is a sweet engine. I used to drive a 62 Impala SS 4-speed with one. Really a fun car.
 
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