Getting head (another head thread)
Thread Starter
Joined: Oct 2005
Posts: 2,336
Likes: 67
From: wyoming @ 12000 DA...
Getting head (another head thread) ok... how much does it cost to have regular smallblock heads converted to reverse flow cooling? Because i think i have a great idea for us LTx'ers.
Ok... Brodix makes a 18* THAT THEY CLAIM can use a normal valve train without any special parts (which is cool because most heads with the better angle valves need ALL KINDS of good exspensive **** to work). Basicly bolt on and go (on a normal SBC).
They flow 320 CFM out of the box and the intake valves are something like 2.14 (HUGE).
The price is set at a cool two grand. What would it take to make them reverse flow cooling so i could throw them on my LT1 and have some of the best flowing heads out there??
Ok... Brodix makes a 18* THAT THEY CLAIM can use a normal valve train without any special parts (which is cool because most heads with the better angle valves need ALL KINDS of good exspensive **** to work). Basicly bolt on and go (on a normal SBC).
They flow 320 CFM out of the box and the intake valves are something like 2.14 (HUGE).
The price is set at a cool two grand. What would it take to make them reverse flow cooling so i could throw them on my LT1 and have some of the best flowing heads out there??
Teching In
Joined: Nov 2005
Posts: 13
Likes: 0
A set of fully ported LT4's might get close but 320 is a pretty damn high number. As for convertins SBC heads, i have never looked into it (i have seen it done), but i would say it isn't worth all the money or else you would see alot more people doing it. But hell that just my opinion and if you have the money to give the conversion a shot, go for it and let us know how you make out.
It's a good idea, but when you factor the $400-600 to convert them, you have the same amount invested as a set of AFR castings ported by AI or Lloyd that flow the same. Then, with the 18 deg. heads, you need an expensive intake converted to EFI or Sheetmetal intake ($$$), custom headers and likely custom pistons because of bigger valves and valve angle. Any time you go 18 degree, it isn't "budget" and in this case, isn't worth it for only 320cfm. It's only worth it for a max effort setup that can't be achieved with a 23 degree casting. Just my opinion.
I don't think a LT4 can do 320cfm and have the rest of the flow curve that the 18X's have.
Flow numbers on the CNC ported versions of the 18X
.200 145 110
.300 214 154
.400 261 206
.500 303 224
.600 328 231
.700 336 237
I've seen people say
.200 144 127
.300 203 175
.400 261 216
.500 306 233
.600 334 240
.700 351 245
The out of the box stuff needs to be ported IMHO.
The best numbers I've seen out of 23° stuff
.200 153 123
.300 212 172
.400 272 210
.500 322 239
.600 358 251
.700 379 258
or
.300 242 178
.400 300 223
.500 342 236
.600 361 243
.700 369 247
I'm willing to bet those two 23° heads make more power than the 18X does.
Bret
Flow numbers on the CNC ported versions of the 18X
.200 145 110
.300 214 154
.400 261 206
.500 303 224
.600 328 231
.700 336 237
I've seen people say
.200 144 127
.300 203 175
.400 261 216
.500 306 233
.600 334 240
.700 351 245
The out of the box stuff needs to be ported IMHO.
The best numbers I've seen out of 23° stuff
.200 153 123
.300 212 172
.400 272 210
.500 322 239
.600 358 251
.700 379 258
or
.300 242 178
.400 300 223
.500 342 236
.600 361 243
.700 369 247
I'm willing to bet those two 23° heads make more power than the 18X does.
Bret
Originally Posted by SStrokerAce
I don't think a LT4 can do 320cfm and have the rest of the flow curve that the 18X's have.
Flow numbers on the CNC ported versions of the 18X
.200 145 110
.300 214 154
.400 261 206
.500 303 224
.600 328 231
.700 336 237
I've seen people say
.200 144 127
.300 203 175
.400 261 216
.500 306 233
.600 334 240
.700 351 245
The out of the box stuff needs to be ported IMHO.
The best numbers I've seen out of 23° stuff
.200 153 123
.300 212 172
.400 272 210
.500 322 239
.600 358 251
.700 379 258
or
.300 242 178
.400 300 223
.500 342 236
.600 361 243
.700 369 247
I'm willing to bet those two 23° heads make more power than the 18X does.
Bret
Flow numbers on the CNC ported versions of the 18X
.200 145 110
.300 214 154
.400 261 206
.500 303 224
.600 328 231
.700 336 237
I've seen people say
.200 144 127
.300 203 175
.400 261 216
.500 306 233
.600 334 240
.700 351 245
The out of the box stuff needs to be ported IMHO.
The best numbers I've seen out of 23° stuff
.200 153 123
.300 212 172
.400 272 210
.500 322 239
.600 358 251
.700 379 258
or
.300 242 178
.400 300 223
.500 342 236
.600 361 243
.700 369 247
I'm willing to bet those two 23° heads make more power than the 18X does.
Bret
Registered User
Joined: Mar 2004
Posts: 199
Likes: 0
From: Austin, Texas
Originally Posted by Dragframe
ok... how much does it cost to have regular smallblock heads converted to reverse flow cooling? Because i think i have a great idea for us LTx'ers.
Ok... Brodix makes a 18* THAT THEY CLAIM can use a normal valve train without any special parts (which is cool because most heads with the better angle valves need ALL KINDS of good exspensive **** to work). Basicly bolt on and go (on a normal SBC).
They flow 320 CFM out of the box and the intake valves are something like 2.14 (HUGE).
The price is set at a cool two grand. What would it take to make them reverse flow cooling so i could throw them on my LT1 and have some of the best flowing heads out there??
Ok... Brodix makes a 18* THAT THEY CLAIM can use a normal valve train without any special parts (which is cool because most heads with the better angle valves need ALL KINDS of good exspensive **** to work). Basicly bolt on and go (on a normal SBC).
They flow 320 CFM out of the box and the intake valves are something like 2.14 (HUGE).
The price is set at a cool two grand. What would it take to make them reverse flow cooling so i could throw them on my LT1 and have some of the best flowing heads out there??
You can go this route and make good power, either way you will spend some bucks making it all work. There are some very good engine builders and drag racers that use the 18-degree heads on the LT1.
We have used the 23 degree AFR 227's (with good success) which we port in house they flow 320cfm intake and 240cfm exhaust. I'm not starting a flow bench race here just trying to help a guy out with information.
We then convert the heads to work with an EFI victor manifold, which we also port. You can then use a throttle body, forward facing or carburetor style. We use a 100-degree elbow with a forward facing throttle body due to the engine rules for the class we run.
Your headers will bolt right up and the 100-degree elbow will fit under the hood. We've put down 500HP to the wheels N/A with this set-up. You’ll spend money either way but you’ll spend less and have fewer problems going with the 23 degree heads. If you would like to see some pictures of it check out the website www.PortPros.com.
If you have any questions shoot me a PM, e-mail or call 512-257-0222. Ask for Harold
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Originally Posted by RealQuick
Bret, what 23 degree heads were used for the last two flow sheets? Were they AFR227's or were they non LTx styled (non reversed coold) SBC 23 degree heads?
TECH Enthusiast
Joined: Oct 2005
Posts: 714
Likes: 0
From: Tennessee
You can go this route and make good power, either way you will spend some bucks making it all work. There are some very good engine builders and drag racers that use the 18-degree heads on the LT1.
We have used the 23 degree AFR 227's (with good success) which we port in house they flow 320cfm intake and 240cfm exhaust. I'm not starting a flow bench race here just trying to help a guy out with information.
We then convert the heads to work with an EFI victor manifold, which we also port. You can then use a throttle body, forward facing or carburetor style. We use a 100-degree elbow with a forward facing throttle body due to the engine rules for the class we run.
Your headers will bolt right up and the 100-degree elbow will fit under the hood. We've put down 500HP to the wheels N/A with this set-up. You’ll spend money either way but you’ll spend less and have fewer problems going with the 23 degree heads. If you would like to see some pictures of it check out the website www.PortPros.com.
If you have any questions shoot me a PM, e-mail or call 512-257-0222. Ask for Harold
We have used the 23 degree AFR 227's (with good success) which we port in house they flow 320cfm intake and 240cfm exhaust. I'm not starting a flow bench race here just trying to help a guy out with information.
We then convert the heads to work with an EFI victor manifold, which we also port. You can then use a throttle body, forward facing or carburetor style. We use a 100-degree elbow with a forward facing throttle body due to the engine rules for the class we run.
Your headers will bolt right up and the 100-degree elbow will fit under the hood. We've put down 500HP to the wheels N/A with this set-up. You’ll spend money either way but you’ll spend less and have fewer problems going with the 23 degree heads. If you would like to see some pictures of it check out the website www.PortPros.com.
If you have any questions shoot me a PM, e-mail or call 512-257-0222. Ask for Harold
