emolineaux

iTrader: (40)

ok guys looks like i finally came into a set of 243s off an 07 vette.

these are going to be going on my 98 z28 6 speed.

first of all what kind of gains should i expect to see with bolting these on vs getting them ported.

second do i have to swap my stock cam out or would it work ok with the 243s

nebur8

iTrader: (6)

you should be ok with the stock cam if you don't want tear open the engine. Also you might get more info in the internal engine forum.

jsteele90

iTrader: (13)

maybe 10-15 hp to the wheels those unported 243s will do for you. i did a 224r cam and a set of 2002 ls6 243 heads on my car and it went from 339hp/327tq to 383hp/372tq

LS_10

iTrader: (1)

I'm not sure what would be better. My friend has an 86 mustang with an LS2 in it Diamond piston's crower rods Victor jr. FI setup TH-400 T-rex and ported 243's with big 2.02's he had trouble with water leaking through due to so much porting so we put my Stock LS1 853's stock valve size 5 angle valve job decked .030 ported (Jeremy Formoto) heads and with 1.5 less compression and the smaller valves it mad 13hp less to the wheels with 2 degree's less timing than with the other heads cause we put a second stage of nitrous on it so who knows might have made the same or more with the 853's. And get this it ran 4 tenths faster with the LS1 heads on the same stage as with the 243's. ??????????? Crazy so who knows

emolineaux

iTrader: (40)

im not looking to jump my hp up alot just want to do as much bolt on stuff as possible. if its not enough for me ill upgrade the cam at that point.

emolineaux

iTrader: (40)

any clue what i should be making at the wheels with this setup.

243 heads (unported) stock cam. kooks long tues catted tsp y slp lm2 catback, slp lid and ram air duct. ls6 intake, and a tune

Mean87SS

iTrader: (21)

Eric, my 98 with STOCK 98 heads put down 342/349 through an auto... LT's, ORY, Magnaflow, LS6, Ported TB, Lid.

emolineaux

iTrader: (40)

ok so i might be putting out just over that but who knows lol.

ChevyRyda99LS1

numbers in my sig with 228 and ported 241 heads

BigKap94z

iTrader: (47)

You will probably make around 350rwhp or so with that setup, don't get caught up on the numbers though. Those heads in stock form are a big improvement. If at somepoint you are planning on upgrading the cam, look into changing the springs before the heads are installed. It makes the task SOOO much easier. Also you can bump the compression up by milling and/or thinner headgaskets....this is relatively inexpensive and will help make more power. I would also recomend using either ARP bolts/studs when you reinstall the heads as well.

Havok2

iTrader: (118)

same mods here, i put down 341/344

Havok2

iTrader: (118)

so bolt ons + 243s, i say 360 is obtainable

c5z28

iTrader: (11)

Did that stall go in the same time after you installed the h/c seems like just thew 224 should have given you those numbers.