SOLD ... These are new, in the box, and have never been mounted on an engine. I bought these heads in 2004, but have never used them. They have been correctly stored standing on-end ever since.

ZZ3 and early ZZ4 heads had the "Orange" valve springs these heads have; later ZZ4 heads had different springs and retainers.

10185087 is the revised casting of the aluminum L-98 heads that came on '88 and later Corvettes with the "D-shaped" exhaust port. They have 58cc combustion chambers, 163cc intake runners, 3/8" screw-in studs and 1.94/1.50 valves, and angled spark plugs.

They flowed well in stock form, but these particular heads have been ported by Reher Morrison Racing Engines and now flow the following:

Stock ZZ4:
.300: 160 (int), 125 (ex)
.400: 186 (int), 150 (ex)
.450: 191 (int), 163 (ex)
.500: 196 (int), 170 (ex)
.600: 199 (int), 175 (ex)

After Porting:
.300: 175 (int), 128 (ex)
.400: 206 (int), 154 (ex)
.450: 212 (int), 167 (ex)
.500: 215 (int), 172 (ex)
.600: 215 (int), 177 (ex)

I have the flow sheet showing this.

Scoggin-Dickey sells the unported version of these heads for 552.95, each, plus shipping.

http://sdparts.com/details/gm-factor...parts/10185087

Pace Performance sells the unported versions for 609.95, each, plus shipping.

http://paceperformance.com/index.asp...D&ProdID=22850

I'll take 850 for these, shipped, with insurance, to anywhere in the lower 48 states.

email me at seanof30306@yahoo.com

 

More pics

 

Even more pics

 

Vicious attack dog who doesn't like to negotiate on price.

 

These flow nearly as well as Vortecs, and use a standard intake. They'd be great for a TPI or a TBI car where you already have your intake set.

A Vortec TPI base is 469.95 + shipping at Pace Performance

http://paceperformance.com/index.asp...D&ProdID=73239

At Scoggin-Dickey, it's 469.99 + shipping

http://sdparts.com/details/edelbrock/e3817

and 469.95 + shipping at Summit

http://www.summitracing.com/parts/EDL-3817/

Also, the 58 cc chambers will give a nice compression bump on a 350/383 that had 64 cc heads, and will maintain compression on a 305.

 

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Be about it

 

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Which intake do these heads use, pre 86', or 87 & later?

 

87 and later

 

Weird, Corvette's and the ZZ4 both use the pre-86 intake bolt angles.

 

You may be right. The 087 heads came on 88 and later Corvettes, so I just assumed they were the later style intake.

 

Compare the center pair of bolt holes to the outer bolts. If they're all the same, it's 86-older, if the center bolts are more vertical they're 87-up. Traditionally they should be the early style. I have no idea why GM didn't change the bolt angles on the aluminum heads.