dphc18

iTrader: (5)

I was wondering what is needed to run 2006 Zo6 heads on an ls2? and if there is a benefit running the 12 degree LS7, V.S. the 15 degree LS3 heads?

sandragnx

iTrader: (82)

LS7 head requires a 4.100 minimum bore size.You can use your LS2 block if you replace the sleeves with Darton sleeves and bore bigger.

Hardcoresoldier

iTrader: (2)

there is a company that makes LS7 heads for 4.0" bore LSx engines

lil john

U could use them with a 1.560 exhaust valve..4.005 bore....But the port starts @ 270cc's and larger so it would typically be used in a stroker such as a 402-454+ .......... with a small bore and a large port a stock cubic inch engine will be limited....if you are just keeping stock LS2 engine size 6.0 look into some aftermarket heads.....TFS,AFR,or a set of plain L92's and get a bowl job...

and if there is a benefit running the 12 degree LS7, V.S. the 15 degree LS3 heads?


The heads are better because of the valve tilt in the heads and the basic geometry


Stay thirsty my friends.....Mr. Dos Equis...... Football season has started.....!

1999Firehawkls7

iTrader: (3)

TSP had a small bore Ls7 head they designed for thier 418 Motors, and its min. bore size required is the same as a stock 6.2l Ls3 Bore (4.065) and they said that they have tried it w the stock stroke and it was a turd down low and had to Trq to it at all......in the long run youd be money save and make more power w a set of head that are designed around your short block!

lil john

Very good case That's one of the reasons I choose Mast 240cc small bore heads now on Lay A Way....most cathedral style port heads have good low end TQ numbers because of the smaller runner size but lose it up top because of smaller runners.***But perfect for FAST 102 that's Y they tend to do better FAST can't support 355cfms from a WCCH L92 let alone Ported LS7 heads......Cathedral are the best on the flow charts @ Mid lift Flow #'s to be exact...perfect for... street...Fast intake .....strip...Rectangle ports tend to need *less cam that puts a major influence on *shorter RPM band and more *TQ ..down low...because of the larger runner size....... most Rectangle heads with fast intake or Factory will DIE @ 6500 to 6900 Rpms....Large ports tend to be lazy but wake up in the upper lift's...AKA smaller cam for more TQ........Also note..in Cathedral & ls7 heads challenge who won? Same head design just with as smaller port 240cc... 408 ls challenge The Mast med bore 256cc would have won using Mast intake and more lift......TSP was behind 20hp on the ole 490ci vs Mast intake & Mast 274cc LS7 heads set-up..... with either PRC 265 or there big daddy 285cc heads (that out flow Mast heads on their site over 400cfms vs 390)..They are 1 of the best if not the best...Mast has 11 -12 degree everything Rectangular / Cathedral port.

Now back to the case as some of U who no I have a 408,12.o solid roller 250's /270's 715 lift ....Vic.Jr...etc.....
Now let us take note...TSP 250-260cc LS3 heads & Small bore LS7 were all tested with 4.125 bore, Real #'s from TEA on TFS ls3 heads....any Cathedral head TSP..AFR...TFS... any for the test bore size used and Intake runner size + Engine Size who is really the best ......Now....Note I will use bigger intake and exhaust valves..Mast 240's would be a better test for TFS 234-245 or AFR 220-245 they out flow them using a ****3.900 test bore! LOL!

TEA:Trick Flow 255cc GM LS-3 Cylinder Heads
FLOW DATA 4.060" BORE
Lift Intake Exhaust
0.100 71 59
0.200 140 117
0.300 225 168
0.400 288 213
0.500 331 236
0.550 348 241
0.600 361 247
0.700 373 254
* *******Tests conducted on a Superflow SF600 at 28" of water, 4.060" bore, 1.875" exh. pipe

PRC LS3 Aftermarket 6-Bolt 250cc CNC Cylinder Heads
Intake Flow Exhaust Flow
.200" 154 cfm 117 cfm
.300" 221 cfm 170 cfm
.400" 281 cfm 205 cfm
.500 325 cfm 225 cfm
.600" 354 cfm 235 cfm
.650" 358 cfm 240 cfm
.700" 361 cfm 243 cfm
********I believe to be a 4.125 test bore

PRC LS7x 265cc CNC Small Bore Heads
Intake PRC LS7 Exhaust
.200 169 118
.300 246 176
.400 304 208
.500 348 221
.600 380 230
.650 383 235
.700 388 240
******** 4.125+ test bore

Trick Flow 245cc GM LS Cylinder Heads cathedral ***or would you rather for me to whoop on the 235's***
FLOW DATA****** 4.185" BORE
Lift Intake Exhaust
0.100 69 56
0.200 146 130
0.300 237 201
0.400 294 249
0.500 336 269
0.550 348 273
0.600 353 276
* *******Tests conducted at 28" of water, 4.155" bore, 1.875" pipe

Rectangular Port LS3 240cc *11 Degree Small Bore CNC heads (3.900"-3.960" Bore)
Flow Data *w/3.900" Bore Plate + CFM's with larger bore size 4.030 and larger intake valve stock is 2.08 ..vs.....2.160

Lift Intake Exhaust
0.100 72 55
0.200 148 107
0.300 224 155
0.400 282 203
0.500 322 214
0.550 338 222
0.600 342 227
0.650 346 231
0.700 353 257


Velocity is as Important,if not more than particular CFM's at a given lift...it all goes back to runner and valve design....... Smaller ports with high flow rates tend to work really well together.Larger Rec. ports need more Air and usually hurt in the mid range of lift at there give size runner.....TFS 235 VS Ported 270cc+ ls7 heads...Bigger is not always better.....only if you've grown into those shoes
Cam's are made to match your head design.Anything can work with the right Mind's and parts....TSP Small bore head is better than WCCH L92's...both have 267 cc port's....12* degree vs 15*degree.... better overall design...

Fast86z

iTrader: (1)

Dang dude you could write a book! Thanks for taking the time to write all that up!

lil john

If you know a lot* then it is Required to give back a lot.... AKA: The Golden Rule

Dang dude you could write a book! I could....trust me I'm only missing a few things they teach @ SAM.....and never been to a class.

I've also Read the Best Book of them All ......All 66 books!

B*.asic I*.ntruction B*.efore L*.eaving E*.arth


Note: all this info is online.... I just keep part #'s,stats and engine combo's on file easy access....Just go into 1 of my Email folders

Jenson

iTrader: (32)

I think what he meant is its hard to decipher your post. Tons of great info as always lil john. I love reading your posts and trying to extract all the information from them. I personally like my heads to flow as close to 80% as possible, which are typically TEA, TFS, AFR, and AI. Just so its in the same spot and I like comparing heads;

AI TFS 230's - 4.00 bore 28" water 2.055" IN and 1.575" EX
lift IN EX
.100 69 55
.200 146 108
.300 214 154
.400 274 203
.500 313 222
.550 324 235
.600 334 243
.650 339 246
.700 338 248

lil john

Point is: 1* Velocity is as Important,if not more than particular CFM's at a given lift...it all goes back to runner and valve design....... Smaller ports with high flow rates tend to work really well together.Larger Rec. ports need more Air and usually hurt in the mid range of lift at there give size runner.....TFS 235 VS Ported 270cc+ ls7 heads...Bigger is not always better.....only if you've grown into those shoes;AKA Bigger Engine size. Cam's are made to match your head design.Anything can work with the right Mind's and parts....TSP Small bore head is better than WCCH L92's...both have 267 cc port's....12* degree vs 15*degree.... better overall design...
2* TSP 250-260cc LS3 heads & Small bore LS7 were all tested with 4.125 bore, Real #'s from TEA on TFS ls3 heads....any Cathedral head TSP..AFR...TFS... any for the test bore size used and Intake runner size + Engine Size who is really the best ......Now....Note I will use bigger intake and exhaust valves..Mast 240's would be a better test for TFS 234-245 or AFR 220-245 they out flow them using a ****3.900 test bore! LOL!
3 *most cathedral style port heads have good low end TQ numbers because of the smaller runner size but lose it up top because of smaller runners.***But perfect for *****FAST 102***** under 340cfms........ that's Y they tend to do better FAST can't support 355cfms from a WCCH L92 let alone Ported LS7 heads......Cathedral are the best on the flow charts @ Mid lift Flow #'s to be exact...perfect for...1* street...2*Fast intake .....3* hood clearrence...Rectangle ports tend to need *less cam that puts a major influence on *shorter RPM band and more *TQ ..down low...because of the larger runner size....... most Rectangle heads with fast intake or Factory will DIE @ 6500 to 6900 Rpms....Large ports tend to be lazy but wake up in the upper lift's...AKA smaller cam for more TQ........Also note..in Cathedral & ls7 heads challenge who won? Same head design just with as smaller port *240cc... 408 ls challenge The Mast med bore *256cc would have won using Mast intake and more lift......TSP was behind 20hp on the ole 490ci vs Mast intake & Mast *274cc LS7 heads set-up..... with either PRC *265 or there big daddy *285cc heads (that out flow Mast heads on their site over 400cfms vs 390)..
4* They are 1 of the best if not the best...Mast has 11 -12 degree everything Rectangular / Cathedral port. And they always place 1 in any competition with heads right out of the box.......

lil john

I have to go do a Store here in Houston.....So happy not to have to drive 10 hrs. or more.
For the give engine size and parts that have been gotten Most people would go with a Cathedral style head...AKA AFR:205 thru 230 and some may go with 245's or TFS 235's compare them to Mast 240cc & BORE size tested 3.900 vs 4.030- 4.155 bigger bore size to = that of Mast 240cc which head looks better Now.....here's the closes thing that was test for the bore size used

Trick Flow 215cc GM LS Cylinder Heads cathedral ***or would you rather for me to whoop on the 235's***
FLOW DATA ******3.900" BORE
Lift Intake Exhaust
0.100 66 54
0.200 138 118
0.300 218 187
0.400 272 231
0.500 308 252
0.550 318 258
0.600 324 262
* Tests conducted at 28" of water, 3.900" bore, 1.875" exh. pipe


No Contest....Holla Back....

Jenson

iTrader: (32)

Those are nice!! especially with 15cc less intake volume

dwill73

It sucks Mast discontinued Carys Ls7 4.0 heads. CCd around 248 on the intake runner, 2.125 intake valve, and flowed comparable to these other heads on a 4.030 bore plate with less valve and intake runner.

midnightbluS10

Can we get some punctuation over here? Wth is this? Using ".........." to connect unfinished thoughts aint it. This is worse than middle schoolers texting. It's not that difficult to use complete sentences and proper punctuation.

You should realize by now that when people see a huge block of text with random "....." thrown in to connect it all, they usually just skip your post. If you can't take the time to present your thoughts properly, why the heck should I spend time trying to decipher what you're saying?

lil john

You don't have to.I do this to change point of view or change subject.....I took College English....I also don't care If you don't read my post or not.... I Always have good info...look me up....Others love to read or learn you can drop my class...Drop out.....

lil john

They still sell the Mast small bore head...Last checked, last FRi. for $999.oo or if you are near by Jobber price $949.+ tax ea. I'll be getting them for the 2nd price...

lil john

Also look @ my last post on Update Mast heads are now on Lay a way...RED High Port 240cc Mast small bore heads ( over all port design)...Looking to find some one to do this other than getting bigger valves...etc.ETP site doesn't come up any more...but I have all there head #'s on file.Their ole *ETP 240cc G3 *C5r* heads were $2800--3200 in price and required a custom intake. Test bore 4.125 intake valve 2.180 58cc and 1.625 exh. valve
100' 66 51
200' 153 106
300' 216 153
400' 277 206
500' 325 232
550 343 237
600' 363 240
650' 376 241
700' 388 242
750' 397 243

Did RED do the same heads here? Raised Runner* My point exactly.they used Mast small bore heads filled the floor of the runner and opened up the roof of the Heads and moved intake bolt up to match higher roof runner...still the same 240 cc but with Tremendous amount of Air flow. 390cfms to be exact. Know of any one who can do this...With top notch results RED priced the work for 1200 bucks for heads and 500 to mod intake..They had some bad reviews that's Y I won't go with them doing this..Know of anybody

LS1MCSS

iTrader: (18)

TSP 418 is 4" stroke and 4.080 bore.

1999Firehawkls7

iTrader: (3)

The TSP Ls7 small bore heads they sell fit on a stock Ls3 Bore tho......thats all I was getting at.....

http://www.texas-speed.com/p-3948-pr...ore-heads.aspx

JayplaySS

iTrader: (15)

Amen sir