SDPC has them for 800$ assembled. i am contemplating them if ported will they perform? i am also doin cam and headers. any one have xperience with them? they have 58cc chambers compared to my 64cc chamvers what will my compression be after? and 163cc ports. my budget doesnt allow for much more than 800$

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

 

If your going to port them you could get a set of used ones from www.contemporarycorvette.com just make sure you get the 113 castings from the '88 and later L98's due to their .100" higher exhaust ports they flow much better than the older ones ('86-'87).

Oh and the 58cc chambers should be about a 1 point compression increase compared to 64cc castings.

Jeff

[This message has been edited by NavyVette (edited May 29, 2001).]

 

Another good place for used ones is Taber Corvette Parts, www.tabertouch.com
I got mine complete for $400. Rebuild them and port and your in business.

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'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

 

well the SDPC heads are brand new . i called them tday 850 delivered with 1 year warranty. i wonder if they are the 113 castings though hmm i will call those used vette places tommorow and see what they got thanks

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

 

by going to a 58 cc head you will see a gain of .6 in your compression or roughly 1/2 point maybe .8 if you use a thinner gasket rule of thumb for every cc of size you will gain or lose .1 in compression

 

Just to let you know, you can get TFS 23 deg heads from Summit for $850. These heads will Laugh at any L98 Vette heads no matter how much you port them. Just thought I throw that in here.

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82' Z-28. 327" w/ flat tops. 216/228/112LS. Pocket ported 041 heads 1.94/1.50 SS valves. World Class T-5 from a 91'. Best run? Runs with 2001 vette to 150mph! Soon to be converted over to TPI w/ supercharger.

 

yeah but my emmisions station attendent will laugh at me when i brag about my cc flow as he puts my bright red failed sticker on my windshield....23* heads from what i gather dont have egr passages. but the G2's do and they are over a grand.

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

 

The vette heads don't have EGR passages either.
To get working EGR you have to rig up a deal off the #8 header tube and run either a vette TPI baseplate or an Edelbrock or Accell.. gotta make it look something like this...

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'89 Formula - Thunderchicken - 355 Vette L98/T-5/3.45 9-bolt/black/t-tops - the fun car!
'90 GTA - The GTA - 5.0 LB9/TH700/3.27 9-bolt/black/t-tops/tan leather - the cruiser.

 

The TFS 23deg heads are 50 state legal. When I got mine, they even came with a CARB EO number tag...Pretty damn hard to beat. The Exhaust passage was also drilled in mine. It has to be, to be 50 state legal.

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82' Z-28. 327" w/ flat tops. 216/228/112LS. Pocket ported 041 heads 1.94/1.50 SS valves. World Class T-5 from a 91'. Best run? Runs with 2001 vette to 150mph! Soon to be converted over to TPI w/ supercharger.

 

Yeah go with the TFS 23º if that is your budget ceiling. Some guy has been selling them for $817 and $807 on Ebay for a few months. Myself I got NEW E-TEC 200's for less than you can buy the bargain basement TFS 23º heads, but that was just luck. Also the G2 is a real pain in the @ss to get roller rockers and valve covers to co-exist together. I have been thinking they are just selling out the rest of the G2 heads and will go with the 23º when they are gone, who knows for sure?

 

Go for another set of aftermarket heads instead! They are not worth 800$, my exp.....

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a Canfield headed 383 in the works!! ready May 2001...
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)