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Head cc for 427

 
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osmiumfoot
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Joined: 11 Jun 2002
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PostPosted: Tue Jan 12, 2010 1:46 am    Post subject: Head cc for 427 Reply with quote

I am trying to set up a combination to run 11.5 without panting. I bought a Dart Little M 4 1/8 bore block and set it up with 10.5 pistons and a 4 inch crank. The cam is a 630 lift roller with 260 degrees. I have a set of 200 cc Dart Conquests that are laying around the garage. I think they flow about 280 at 600. My plan is to keep the shift point at around 5 to 5.5k for engine longevity, and am looking for opinions as to whether or not these heads will cut it or do you think they are too small. They worked well on a 350 I was shifting at 6.8k. The car is 3800 lbs wet and is 4:10 geared with a 3.5k stall. It presently has a 400 in it that runs 11.6 but I have to wind it to 6.8k also, and since the 350 came unwound after 5 years of la vida loco, I am wondering if the 400 will make it to the end of the Mayan calendar. My alternative is to take the AFR 210s off the 400, or get a pair of AFR 235s or the new Brodix 229s, although I think either of these heads will put the car well under 11.5 unless I'm shifting so low that the converter is unstalled most of the way down the track.
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Paul P
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Joined: 15 Aug 2002
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Tue Jan 12, 2010 11:22 am    Post subject: Reply with quote

Not sure if that RPM with get the job done. You will have to spin it probably to 6000-6500 to make the power to get into the mid 11's with that vehicle weight.
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2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Big Dave
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PostPosted: Tue Jan 12, 2010 4:17 pm    Post subject: Reply with quote

I used to shift my 425 horse L-88 427 at 7,200 RPM but it had 320 cc intakes with aluminum HiPerf heads. The 390 horse 427 with cast iron oval port Pass heads had 230 cc intakes to give you a comparison of what the factory engineers though were required for street vs race use.

Big Dave
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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Jan 12, 2010 6:12 pm    Post subject: Reply with quote

Which AFR heads? A lot of changes were made in the last 3 years to the combustion chamber.
The conquest head flows 270@ .600 and chokes from there big time.
The AFR 210 race is 280 ish@ .600 but hangs on later.

Both of those heads are small for a 427 but should work OK.
Figure the converter being close to 800 rpm more with the higher torque of the 427.
I hope you shift in the 6500 range(500 above peak HP) to make it ET.

I as SuperDave say you need bigger heads though. Laughing

Keep us posted.
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osmiumfoot
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PostPosted: Tue Jan 12, 2010 11:46 pm    Post subject: Reply with quote

Thanx, folx. The AFRs are full CNC and are about 5 years old. Sounds like I should hang up the Darts and try the AFRs.
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