Anyone add plain 243 heads to a mild cam?
10-19-2008, 06:23 AM
#3
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with a GOOD valve job and bowl blend,you should see at least 25-30rwhp from a set of 243s..a little more if you have them milled for higher compression..
10-19-2008, 09:50 AM
#4
Stock 243 heads should add around 25rwhp to your combo.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
10-19-2008, 10:03 AM
#6
Out of the cars I've done (3 to 6 cars) I have seen between 10 to 15 hp at the wheels with mild cams (like you have) out of stock 243 LS6 from the 241 LS1 heads. But at the track they picked up between 1 to 2 tenths and 2 th 3 mph in the 1/4 mile. My 243 (LS6) heads on my car are stock just Comp Cams 921 spring kit for my cam.
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10-19-2008, 01:26 PM
#8
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Thanks for the replys. Yes I have the 241 heads now with every bolt on for my 99 vette. Pat you really say 25rwhp huh? if anyone you would know the best. Again this would be take off 243 castings no mills no port work
stage 2 
10-19-2008, 05:22 PM
#13
If memory serves me we've seen appox. 14-15 flywheel horsepower from a 241 head to a stock 243 casting.
We typically see close to 40hp from the PRC cnc ported heads. Depending on your camshaft, with milling you can see 50+.
We typically see close to 40hp from the PRC cnc ported heads. Depending on your camshaft, with milling you can see 50+.
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
10-19-2008, 09:06 PM
#14
What about non ported 243's Milled .030 with .040 gaskets.
flycuts
and MS4 cam?
I already have the cam and flycuts, and 853 heads milled so its simply a matter of switching to 243 castings.. What would the gains be with a cam like the MS4
flycuts
and MS4 cam?
I already have the cam and flycuts, and 853 heads milled so its simply a matter of switching to 243 castings.. What would the gains be with a cam like the MS4
10-19-2008, 09:38 PM
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has anyone done stock 243's with a cheatR cam? I'm getting the cheatR cam ASAP and might consider 243s if I can find them cheap enough and its worth it.
10-19-2008, 10:20 PM
#17
just saying why bother going through the trouble of a head swap when he can save up a few more bucks get them cnc ported and milled and make some real power out of them. the ported heads will only compliment a bigger cam down the road better than a stock 243casting
11-08-2008, 09:31 PM
#18
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Newbie here.......stock 863 heads stock cam stock intake switched to stock 243 maybe milled with lq4 gasket for compression with cam (un decided 0pen for discusion) and ls6 intake............need setup ideas
11-08-2008, 10:28 PM
#19
Stock 243's with a clean up and a valve job will net as much or more power as a PRC 5.3 head. Honestly, if you can't make more power with a 243 over a 5.3 head I don't know what to tell you.
