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post #1 of 18 (permalink) Old 03-31-2005, 04:06 PM Thread Starter
 
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SC heads

I'm looking at buying a pair of SC heads, they are from a 91 coupe and would I need a intake and headers or could my 96 stuff work...Im wondering if I would gain anything from this....what do you guys think...
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post #2 of 18 (permalink) Old 03-31-2005, 04:28 PM
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Dont think you would gain a thing by what I've read.

If all else fails get a bigger hammer!

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post #3 of 18 (permalink) Old 04-03-2005, 11:45 PM
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you'd gain a better head, but nothing more. They're not better flow-wise, just strength-wise.





Oh my bad, you'd gain the SC stamping on the casting too.
-Thomas

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post #4 of 18 (permalink) Old 04-04-2005, 03:33 AM
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Quote:
Originally Posted by Thomas
Oh my bad, you'd gain the SC stamping on the casting too.
and bigger rocker arms.

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post #5 of 18 (permalink) Old 04-04-2005, 11:40 AM Thread Starter
 
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anyone know if they would be a direct bolt on from 90 to 96
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post #6 of 18 (permalink) Old 04-04-2005, 10:25 PM
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Quote:
Originally Posted by big mike
and bigger rocker arms.

rockers arent part of the heads silly.

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post #7 of 18 (permalink) Old 04-04-2005, 10:28 PM
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Quote:
Originally Posted by tbird96
anyone know if they would be a direct bolt on from 90 to 96
As long as they're 89-93 SC heads, and use the SC headgaskets too.
-Thomas

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post #8 of 18 (permalink) Old 04-04-2005, 10:40 PM
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Quote:
Originally Posted by Thomas
rockers arent part of the heads silly.
yes, but they bolt on to heads. these sc heads could be complete with the rocker arm assemblies.

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post #9 of 18 (permalink) Old 04-04-2005, 10:49 PM
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According to Supersix Motorsports, your 96-97 heads have the improved cooling ports just like the SC heads. If you get the SC heads, you will need 8mm bolts for the intake:

From Tom Y:

I've always liked the 96-98 3.8 cylinder heads. They are heat treated, have a deck just like the SC heads, same intake and exhaust ports, same combustion chambers, but they have 2 main differences:

1. They use a very light weight 7mm valve train for which we have bigger valves, great beehive springs, retainers, etc for .580 lift with .060" clearance.

2. They use 2 less lower intake-to-cylinder head bolts, but this has not been a problem on 3.8's up into the 19 PSI range. The other SC lower intake-to-head bolt holes line up perfectly, just have to use a different thread pitch lower intake to head bolt available everywhere.
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post #10 of 18 (permalink) Old 04-04-2005, 11:00 PM
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my SC heads were a direct bolt-on, no different bolts, and no less bolt holes, totally the same. And the96-98 coolant passages are the same as the SC, but the SC gaskets have a stronger design to them (from what I've read).
-Thomas

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post #11 of 18 (permalink) Old 04-04-2005, 11:24 PM
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Quote:
Originally Posted by cougarsc
According to Supersix Motorsports, your 96-97 heads have the improved cooling ports just like the SC heads. If you get the SC heads, you will need 8mm bolts for the intake:

From Tom Y:

I've always liked the 96-98 3.8 cylinder heads. They are heat treated, have a deck just like the SC heads, same intake and exhaust ports, same combustion chambers, but they have 2 main differences:

1. They use a very light weight 7mm valve train for which we have bigger valves, great beehive springs, retainers, etc for .580 lift with .060" clearance.

2. They use 2 less lower intake-to-cylinder head bolts, but this has not been a problem on 3.8's up into the 19 PSI range. The other SC lower intake-to-head bolt holes line up perfectly, just have to use a different thread pitch lower intake to head bolt available everywhere.
So if I understand this 96-98 heads are actually better than SC.

If all else fails get a bigger hammer!

93 SC Tbird
MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
96 1/2 XR7 Sold and Salvaged
93 5.0 Tbird
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post #12 of 18 (permalink) Old 04-05-2005, 10:42 AM
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they're not better. Tom is saying the 96-98's have a smaller valvesteam diameter. You can look at it as lighter weight, or weaker valves. The bigger valves, beehive springs, and retainers thing was talking about the aftermarket they have available for them.
-Thomas

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post #13 of 18 (permalink) Old 04-05-2005, 02:19 PM
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The shop manager at my shop was saying there were some 98 heads that had stock beehive type springs at the shop. I'll have to take a look at them....
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post #14 of 18 (permalink) Old 04-05-2005, 03:09 PM
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Well I'd have to call aviable parts a good thing. How often do you hear of breaking valve stems?

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MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
96 1/2 XR7 Sold and Salvaged
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post #15 of 18 (permalink) Old 04-05-2005, 04:18 PM
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not breaking, but bending. But it's really not a big deal anyway, unless you're going for a lot of HP (see me) my larger valves have an 8mm stem. I think Tom was just saying the available parts for heads in general, because with cheap machining you can fit conical springs onto the SC heads anyway. There's really no more availability for the 96-98's than there is the SC heads.
-Thomas

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post #16 of 18 (permalink) Old 04-05-2005, 08:40 PM Thread Starter
 
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anyone think its a good idea to buy em....
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post #17 of 18 (permalink) Old 04-05-2005, 09:39 PM
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I say save your money, unless you want/need a second set of heads.

If all else fails get a bigger hammer!

93 SC Tbird
MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
96 1/2 XR7 Sold and Salvaged
93 5.0 Tbird
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post #18 of 18 (permalink) Old 04-05-2005, 09:45 PM
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unless your heads are warped from a blown headgasket and these SC heads are cheaper than decking, I'd say dont worry about it. For 450 bucks you can buy mildly ported heads and get a gain from it.
-Thomas

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