The Heads
We used Pro Filer's 12-degree Hitman cylinder heads because DNE has built several engines with them and had the experience to make prepping these heads for our motor fairly painless. Dave sent the bare heads to MBE Performance Parts to have the chambers blended, a 5 angle valve job performed, and the runners cleaned up. The exhaust ports are huge to begin with, so those were left untouched. For an as-cast part, out of the box, these heads are pretty nice, and the work that MBE did really took these heads to competition level quality. The 12-degree valve angle promotes high-speed airflow into the chambers, and the port designs work really well in a naturally aspirated configuration. After the port work was finished, Dave chucked the heads into his mill to clearance the intake ports for the pushrods. We also spent a considerable amount of time cc'ing every single port and chamber as part of the design phase of this engine. Here's how the heads spec'd out after the port work:

(Flowed on a Super Flow 1020 bench at 28 inches of water)
Intake runner: 507 cfm
Exhaust runner: 319 cfm
Intake port volume: 475 cc
Exhaust port volume: 187 cc
Chamber volume: 55.5 cc

According to Dave, with this chamber volume the compression ratio is around 12:1 and, based upon previous engines he's built that are still running, is completely safe as long as you pay attention to the details and maintenance required of an engine like this one.

SOURCE
Akerly & Childs
www.akerlychilds.com
Manton
www.mantonpushrods.com
ARP
531 Spectrum Circle
Oxnard
CA  93030
805-278-7223
MBE Performance Products
www.mbeperformance.com
BG Fuel Systems
Rte. 1, P.O. Box 1900
Dahlonega
GA  30533
706-864-8544
Moroso
Guilford
CT
2-03/-453-6571
www.moroso.com
Brodix
301 Maple P.O. Box 1347
Mena
AR  71953
MSD Ignition
El Paso
TX
9-15/-857-5200
msdignition.com
Clevite
engineparts.com
Paul Pfaff Racing
Cometic Gaskets
4-40/-354-0777
Pro-Filer Performance Products
www.profilerperformance.com
CP Pistons
Irvine
CA
949-567-9000
www.cppistons.com
Quick Fuel Technology
Bowling Green
KY
2-70/-793-0900
quickfueltechnology.com
DNE Motorsports Development
Costa Mesa
CA
RB Electric
Earl's Royal Purple
Embee Performance Coatings
7-14/-546-6907
www.embeeperformance.com
Stef's Fabrication
693 Cross Street, Dept MMFF
Lakewood
NJ  08701
IMI Hi Torque Performance Products
www.hitorque.com
System1
www.system1filters.com
Jesel
1985 Cedarbridge Ave.
Lakewood
NJ  08701
732-901-1800
www.jesel.com
TCI
Ashland
MS
662-224-8972
www.tciauto.com
LSM
www.lsmeng.com
Titan Speed Engineering
13001 Tree Ranch Road,
Dept. MMFF
Ojai
CA  93023
Lunati
4770 Lamar Ave.
Memphis
TN  38181
901-365-0950
www.lunaticamshafts.com
Westech Performance Group
11098 Venture Dr., Unit C
Mira Loma
CA  91752
9-09/-685-4767
www.westechperformance.com
Manley Performance Products
Lakewood
NJ
732-905-3366
www.manleyperformance.com