Flowed my ported head
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Freshman User
Joined: Dec 2006
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Flowed my ported head
Well i finally got my head done and on the bench today. I ported it four years ago and did a valve job but went back in and fixed it up some. I cut it for 1.94-1.60 valves, cut the seal boss for more lift and also for a standard teflon seal size. I am very pleased as it flowed more than expected and sounded great. It also out flows SB chevy 200cc dart 2.05-1.60 valved heads!!
Stock ported IN stock EX ported EX
.100 44.8 73.7 34.5 46.5
.200 86.0 143.3 65.5 92.8
.300 134.5 192.4 100.0 132.8
.400 158.7 231.0 119.0 159.1
.450 165.6 236.5 122.4 167.9
.500 169.0 241.4 124.2 173.7
.550 245.2 178.1
.600 245.2 183.9
Stock ported IN stock EX ported EX
.100 44.8 73.7 34.5 46.5
.200 86.0 143.3 65.5 92.8
.300 134.5 192.4 100.0 132.8
.400 158.7 231.0 119.0 159.1
.450 165.6 236.5 122.4 167.9
.500 169.0 241.4 124.2 173.7
.550 245.2 178.1
.600 245.2 183.9
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Sorry about the jumbled mess but the head gained 72.4 cfm intake and 49.5 cfm exhaust so i'm very happy. This will be a turbo build with stock shortblock to test the limits and see how much i can make. I expect it to make 250hp NA easy and would make 300hp with more compression and cam. These heads kill the production 5.0-5.8 stuff and most aftermarket heads for flow numbers. It should make 500hp with 16psi and maybe 600hp with 20psi if it holds which it should. I also think it will make 600-700 torque. I have run 38psi non intercooled on pump gas with my stock 2.3 and i have a very good crasp on tuning my blow through carbs and turbo setups. Once i find the limits of the cast pistons it will get forged ones and better rods if needed. Just thought i would share this to show my results!! Head went from 169 to 245.5 intake and from 124.2 to 183.9 exhaust don't know why it scrambled my numbers?
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 380
From: Near Los Angeles
cut the seal boss for more lift and also for a standard teflon seal size.
I was hoping you could explain that to me. Thanks.
I was hoping you could explain that to me. Thanks.
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Freshman User
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I cut the guide boss or seal boss down to allow the use of standard performance teflon valve seal, can't remember the size off hand. This also lowers the guide boss closer to the head so more valve lift can be used as the retainer to seal clearance is increased. Hope that makes sense?
I will get some pics and post them. I also did some slight touch up work on the short side radius that should pick up a few cfm, will test after i help my friend dyno his 1200hp turbo street engine tomorrow and the next day. It's a small block mopar and should make 620-640 NA and 1100-1200 with low boost.
I will get some pics and post them. I also did some slight touch up work on the short side radius that should pick up a few cfm, will test after i help my friend dyno his 1200hp turbo street engine tomorrow and the next day. It's a small block mopar and should make 620-640 NA and 1100-1200 with low boost.
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Freshman User
Joined: Dec 2006
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Comp cams has them listed and i have heard of guys running chevy rockers but never did it myself. I am going to run comp stamped steel rockers instead of the cast stockers, as rollers are expensive and for me not worth the gain, i would rather spend the money on forged pistons.
Post Fiend
Joined: Dec 2007
Posts: 8,521
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From: Lost
I have never seen any roller lifters for a 300. It could have something to do with how hard it would be to mod the block to accept the tie-bar needed to keep roller lifters from turning in the bores.
Postmaster
Joined: Mar 2005
Posts: 2,949
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From: Earth
Crower lists roller lifters for the 300 in their catalog. Of course, even if the pricey lifters fit/work you'd still have to pay big bucks for a custom ground cam. On the plus side you'd have to run shorter pushrods, so less chance they'd bend.
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 380
From: Near Los Angeles
You can buy the ARP studs for about $35 IIRC on Summit, converting the rocker studs from 3/8" to 7/16", and then buy a set of bbc rockers on ebay for about $100.
[SIZE=4]I thought I'd post the numbers for the 'frankenSix' build that I previously listed. These #s were for the head on the engine that produced 311 hp:
We also performed several hours of porting on the heads and used a small block Chevy 1.94 intake & 1.6 exhaust valves. This brought the head flow up to 235 cfm from a base flow of 174 cfm on the intake the exhaust was 165 cfm.[/FONT]
[SIZE=4]I thought I'd post the numbers for the 'frankenSix' build that I previously listed. These #s were for the head on the engine that produced 311 hp:
We also performed several hours of porting on the heads and used a small block Chevy 1.94 intake & 1.6 exhaust valves. This brought the head flow up to 235 cfm from a base flow of 174 cfm on the intake the exhaust was 165 cfm.[/FONT]