We have dyno tested engines with heads that flowed 400 and then changed to heads where every port went turbulent to flow 375. They both made the same power. Now, if you ran a set of heads that flowed 375 because of improper porting or seat work, and then reworked them to flow 400, they would for sure make more power.
CNC HEAD PORTING For Evolution Big Twin: Our New Web Site is Actively Being Built New Content is Being Added Daily. In the meantime, please give us a call at (208) 696-1250.

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The heads are the Dart Iron Eagle 308 reworked by Jim Valako. The intakes are 320 cc and the exhaust ports were also improved. We ended up with intake and and the exhaust ports being equal to or very close to the AFR CNC 320. Iron heads should last forever in freshwater. "Forever" will come sooner to a few of us than than most sport boaters :eek:
AFR 245 fully CNC ported heads W Titanium retainers + PAC springs; Edelbrock ported Intake; Crower Stainless steel shaft rockers; Manley 3/8 pushrods; APD custom 950 carb; MSD distributor; Precision machined and dyno tuned $15,500- $16,500; Add Brodix aluminum block $2900; Add moroso 4-vane vacume kit $950; Shown with optional 2 – 4bbl intake.

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Both sets of heads use identical valve sizes, and were both tested with a clay radius on the intake port and a 1 3/4" pipe on the exhaust port. Test data was taken on a SuperFlow SF-600 flow bench. From a flow perspective, it appears that the intake ports are very close to the same, even though the Edelbrock heads use a medium riser port size ...
CNC Motorsports opted for Comp Cams valve springs (PN 953-16) that were installed at a height of 1.850-inch with seat pressure of 170 pounds. Open pressure was 488 pounds at 1.203 inch. Finishing off the cylinder head assemblies were Comp Cams spring locators (4778-16), Comp Cams guide plates (PN 4806-8), ARP 7/16-inch rocker studs (PN 135-7101 ...

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Nov 04, 2010 · 243 ls6 head dyno results!! This is a discussion on 243 ls6 head dyno results!! within the Dyno Information forums, part of the Racing Forums category; just wanted to post up some results i got at the dyno today. i know everyone including me likes to ...
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Exhaust port @ .650 lift = 243 cfm Our SFP Stage 1 LT4 cylinder heads are capable of supporting over 1000hp with supporting upgrades. Our test results show that we have improved the head design and flow from the standard level of 640hp.
Both sets of heads use identical valve sizes, and were both tested with a clay radius on the intake port and a 1 3/4" pipe on the exhaust port. Test data was taken on a SuperFlow SF-600 flow bench. From a flow perspective, it appears that the intake ports are very close to the same, even though the Edelbrock heads use a medium riser port size ...

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LS2 Higgins Race Heads | CNC Ported 243. When only the best will do, Higgins Race Developments & LSX Performance Parts have teamed up to provide you real instant Bolt On Power! Our current offerings allow you to fit up almost 30 years experience and development in the …
StoreFront / Cylinder Head Parts & Services / Gen 3-4 LS / Cylinder Head Services / CNC Port LS2/LS6/Truck 243, 799, 317, 035 Cylinder Heads (PAIR) Next Product View Enlarged Image

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Mar 29, 2017 · CNC-Ported LS9. Applying this CNC treatment to cylinder heads properly isn’t a case of simply smoothing out the ports and moving on to the next project. “Our cylinder head department uses years of knowledge and hand ports many configurations and then performs flow testing to determine which version performs the best,” explains Parker.
The heads are the Dart Iron Eagle 308 reworked by Jim Valako. The intakes are 320 cc and the exhaust ports were also improved. We ended up with intake and and the exhaust ports being equal to or very close to the AFR CNC 320. Iron heads should last forever in freshwater. "Forever" will come sooner to a few of us than than most sport boaters :eek:

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That's not a boast, but a dyno proven reality. See the dyno graph below. During testing for the 2016 Engine Masters Competition, the School Of Automotive Machinists & Technology ran a test on their 367CI LS engine of our as cast BE LS7 intake against a CNC ported and hand finished Mast Motorsports LS7 intake from their 2014 Engine Master's engine.

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2014-2017 Chevrolet SS Sedan . Max Power: 2000HP . Max 0-60s. 2.6 sec
Similar work is performed on Evo & Sportster heads as well. Stg-2 Twin-Cam CNC $795.00 . If big torque is what you want these heads are for you! After complete CNC reworking of both intake & exhaust ports new valve guides are installed & sized.

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Got the 243 heads back ported and polished. This is my 1999 corvette with cnc'ed 243 z06 heads over sized stainless steel valves, a cam motion 224/228 duration. 1999 Camaro SS dyno tuning after a heads/cam/intake install. 440hp/370tq Mods: -FAST 102 Intake -Nick Williams 102mm ...
Owners of Evolution® powered Big Twins can increase their engine’s output with a set of our CNC-ported EV heads! The factory casting is CNC-machined to our proven high torque, high power port shapes and the valve sizes are increased to 1.900” intake and 1.630” exhaust. Ductile iron Step-Lock guides are fitted and topped off with high quality Viton® seals and a performance spring kit ...
Super 23 Top-End Engine Kit Dyno Results TFS-K314-500-450 Test Engine: 383 c.i.d. short block with fl at top pistons, Trick Flow Super 23® 195 cylinder heads with 72cc CNC-profi led combustion chambers (TFS-30410013-M72), Trick Flow Track Max® hydraulic roller camshaft (TFS-31402002), 10.0:1 compression,
I worked on one and the first time around with a cam, intake and exhaust specced out to what we thought it might need we saw 255 hp on my dyno. The heads flowed enough air for 280 so there was ...
CNC Cylinder Head Packages All our CNC head packages are fully assembled, milled & cc'd and include comp valve job. Supplied, standard valve train includes one-piece SS valves, Springs , Steel Seat Bases and Valve Seals. Pricing reflects customer supplied, usable cores.

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