98SuperSport

iTrader: (1)

Here they are - 2.00 intake and 560 exhaust

.INTAKE CFM
.100 71
.200 138
.300 194
.400 231
.450 244
.500 271
.550 358
.600 294

EXHAUST

100 .63
.200 . 102
.300 . 129
.400 . 151
.450 .174
.500 . 181
.550 .190
600 .200

Want to know how good these heads would be. They are ported LS1 heads BTW. Thanks for your help

SAM98WS6

not real good...weak on the exhaust side

Bo White

iTrader: (59)

Is the exhaust w/o a pipe? If so then its not real bad, the 358@.550 is a typo on the intake? Should be since its an ls1 casting through a 2" valve.

98SuperSport

iTrader: (1)

i dont know i'm buying these heads for my car the guy who had them first said that he made 60rwhp in his car with an auto and hotcam (he had all supporting mods too)

what kinda power will they make with a big cam?

DavidNJ

There is something really off if it lost 15% of its flow on the intake from .550 to .600.

This thread may provide some insights: https://ls1tech.com/forums/advanced-engineering-tech/436695-importance-high-lift-flow-vs-mid-lift-flow-power.html

I wouldn't spend the time or money (for gaskets, etc.) to install them.

Bo White

iTrader: (59)

Depending on how and what flow bench was used the flow #s just dont look right up top with the high and low- the high being too high and low being well....to low of a drop. LS1 heads flatten out up top but this is odd. If they made 60 additional rwhp over not havin them then thats OK and would more than likely make more power with a larger cam- as do stock headed LS1s. The choice is yours to make in the end, just looks wierd to me. If you have an opportunity have them reflowed by somewere else and see.

98SuperSport

iTrader: (1)

110 views and 5 posts??? any help is greatly appreciated

98SuperSport

iTrader: (1)

how much power over stock do you think they would make?

SAM98WS6

dude...you get what you pay for...why take the chance...

Gunnar@Patriot

iTrader: (20)

Don't know how much the asking price in on these, but if you are looking for the best deal on a set of heads, look no further.

We can do you a set of our 243 castings that are CNC ported with 2.00"/1.55" valves, LS6 springs, new GM MLS head gaskets and new OEM head bolts for only $865.00 per pair assembled. This is an excellent value on a quality set of heads. Here are some flow numbers on these:

.100" 75 / 62
.200" 154 / 121
.300" 215 / 165
.400" 254 / 200
.500" 285 / 217
.550" 292 / 221
.600" 301 / 226

These numbers are taken on our Superflow 1020 bench using a 3.905" bore and a clay radius. We offer a few different options on these 243 castings. For a complete listing, take a look at this thread:

https://ls1tech.com/forums/generation-iii-internal-engine/435820-cnc-ported-243-budget-heads-865-00-per-pair-assembled.html

98SuperSport

iTrader: (1)

the seller made 60whp with them and a hotcam....is it cuz the hotcam is smaller and works better with these heads? i dont want to get them and when i go to throw in a bigger cam like a F14 the car is a turd