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Old 10-25-09, 11:08PM   #1
68GTO
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Default HP FLOW #'s

Anyone have real HP flow numbers with out of the box heads, no additional porting? I know I've seen them listed before and they were different than what KRE's numbers were. Are the KRE numbers correct? Just want some correct numbers to run through one of my dyno sims.
Thanks
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Old 10-25-09, 11:11PM   #2
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Most guys I've talk to, say KRE's numbers are pretty close to what they've got after having them flowed. 330 cfm give or take a few cfm.
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Old 10-26-09, 02:17PM   #3
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They do flow very close to KRE's claims, aprox 330cfm and are a Good Cylinder head outa the box IMO
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Old 10-27-09, 05:12PM   #4
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Quote:
Originally Posted by 68GTO View Post
Anyone have real HP flow numbers with out of the box heads, no additional porting? I know I've seen them listed before and they were different than what KRE's numbers were. Are the KRE numbers correct? Just want some correct numbers to run through one of my dyno sims.
Thanks
Out of the box KRE's High Ports on my flow bench flowed 315CFM @700 lift.
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Old 10-27-09, 05:12PM   #5
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Default KRE High Ports

Quote:
Originally Posted by 68GTO View Post
Anyone have real HP flow numbers with out of the box heads, no additional porting? I know I've seen them listed before and they were different than what KRE's numbers were. Are the KRE numbers correct? Just want some correct numbers to run through one of my dyno sims.
Thanks
Out of the box KRE's High Ports on my flow bench flowed 315CFM @700 lift.
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Old 10-27-09, 08:08PM   #6
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One guy told me his flowed 295 cfm out of the box, that's the lowest
I've heard of. But that could be the guys bench.
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Old 10-27-09, 08:56PM   #7
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Quote:
Originally Posted by 65nss4spdGTO View Post
Out of the box KRE's High Ports on my flow bench flowed 315CFM @700 lift.
I would believe Calvin, No BS from him he is a straight shooter!!
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Old 10-27-09, 09:32PM   #8
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Here's some #'s I got from a post that said these were KRE'S out of box #'s.
100=85
200=170
300=234
400=284
500=316
600=322
700=331
and Exh.
100=71
200=129
300=179
400=221
500=248
600=263
700=270

And here's some from someone else
100=75.78
200=137.9
300=197.1
400=258
500=299.5
600=311.5
700=325.7
and exh.
100=66.49
200=118.8
300=152.5
400=179.6
500=189.8
600=196.5
700=202.5

And some more from another post
100=72.7
200=121.5
300=203.2
400=261.2
500=300
600=326.5
700=337.7
and exh.
100=60.1
200=110.7
300=150.3
400=181.1
500=198.4
600=212.5
700=218.8

The exhaust numbers from the other two sources are a little smaller. Which ones would be more accurate?
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Old 10-27-09, 09:54PM   #9
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To be honest, it really depends on who's bench. The right way is
doing both sets of heads on the same bench same day. I know my guy bench is pretty accurate. I've only had one set of KRE head flowed
we did both RRE and KRE heads on the same day. Both heads flowed
the advertised flow numbers. There's allot of things to look for that's
important, like what dose each port flow, do the ports flow with in 5%
of each other. Is there any trubluance and at what lift. Other thing
what bores sizs was used to flow the heads. A 4250 bore vs a 4.185 bore
The bigger bore will show better numbers, so unless your going to run and
IA block which start of at a 4350 bore a 4185 bore could be really down on flow, not sure but 15 -20 cfm.

So a head like my buddys on a 4185 bore only flowed 295 cfm and the exhaust was trouble. But then again, who knows how accurate the guys bench was...was it a fair comprasion. Allot of things come into play.
If you looking to make 750 hp that out of the box..might not do it...specialy on a 4.185 bore.
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Old 10-27-09, 10:42PM   #10
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Thanks for the info,
I'm building a 461(400 stroker) and was thinking of getting the HP's. I want over 600 hp. The cam I have is a Lunati solid roller: 255/263 @ .050 .626 lift w/1.5's 109 LSA. I'm thinking I might need a little bigger cam, maybe not. Other plans are Victor and 1050 Dominator, also will run on pump gas. My Dyno 5 Sim is showing anywhere from 620 to 640 hp depending on where I put the ICL. Lowest numbers with cam set at 102 ICL(where cam card says to set it). These are with the head flow numbers from the last two I posted earlier. Horsepower goes up even more when I use KRE'S #'s. I'll have to check it again to get the right #'s.
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Old 10-27-09, 11:22PM   #11
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If you only looking to make 600 hp you really don't need the High Port heads I mean their a good head for sure. That cam would be to small and not take advantage of where the HP flow the best. Also a pump gas motor likes 110-112 lobe a 102 is really for a high compression motor. If you look
at the flow numbers you posted you can see they flow all the way up to .700 lift, a .625 lift cam isn't going to take advantage of the best flow numbers.
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Old 10-28-09, 12:26AM   #12
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Quote:
Originally Posted by injunnuity View Post
I would believe Calvin, No BS from him he is a straight shooter!!
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Old 10-28-09, 09:58AM   #13
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You could get 625 hp out of the 310 cfm dports,but I think bang for your buck the HP's are the way to go,with more room to grow.The dports with their smaller valves would compliment your bore size better .
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Old 10-28-09, 03:29PM   #14
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Hey Mark. I was always thinking the 310 heads would run very well 400-440 CI. Too small for 460+ CI. You?
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Old 10-28-09, 04:41PM   #15
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Quote:
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Hey Mark. I was always thinking the 310 heads would run very well 400-440 CI. Too small for 460+ CI. You?
I havn't hit the wall with my 310's yet on my 467.I think they would run really well on a 440 though,been thinking about a 4" forged crank next year and spinning it a little.I'm only going through the traps at 6300 at 137 mph,need more gear and a looser converter.
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