hey guys, can someone help me out here? i've got a set of heads
that i pulled off a non-running Z28 camaro(86 carburated) the # of them is 8793487x. i've tried looking this # up in several books
and cant find out what kind of heads these are. any help would be greatly appreciated

 

Im sure you mean 3973487X

75cc chamber 71-72

Not bad heads but whats your intended use?

 

hey, thanks StrokedZ. i have a 87 Z28 with 91 aluminum heads from a vette. i had the the 87 350 rebuilt and added the alum. heads. i have not started the new engine yet , so i don't know what she'll do yet. i probably will sell the 397# heads, unless you think they will flow better than the aluminum ones. what do you think?

 

It's easier if you refer to head casting numbers by their last 3 digits, plus an "x" if it has it.

487x heads were used on early 70's LT1(vette) motors. They are a large chamber, decent flowing head.

Not sure which head would be better, depends, like Stroked said, what you plan on doing with it. Street or Strip or both?

 

it would be street with the occasional run at the strip

 

the 91 corvette heads are better.

 

Those 487X heads are actually one of the preferred heads to use by the super stock racers.

They're large chamber, good flowing heads. If you work them over, they can flow very well but the only drawback is the big chamber really drops the compression ratio down unless you use a dome piston on a 3.48" stroke motor (350)

Anyhow the L98 heads which you have (aluminum) are decent heads but not anything special. Is you car carb'd or fuel injected?

Im sure you already know this, if carb'd you'll need to either elongate (drill out) the center two holes on either side of your carb'd intake......

-Carm

 

my car is fuel injected. the guy who rebuilt the engine for me sold me the heads. he had to redrill the holes in the intake in order to make them fit. i don't know, maybe they're vortec heads.

 

They are "perfered" because a superstock motor has to use the stock head casting for that specific 60's/70's era NHRA superstock class motor. ( or a NHRA allowable supstitute) . {Thats why they try to find these heads} The 487X heads are just slightly better than the other heads of the era. They are not as good a head in stock form, or in ported form as the GM corvette L-98 head is. ( stock and ported) The corvette head has much more potential and should be "perfered" by you.

If you've ever seen a real prepared NHRA superstock head you'd know that the finished product is a whole different story that what they start with. ( extensive welding, epoxy, porting, angle milling etc etc.) Big $$$

Sell the 487X heads to a superstock motor builder and use the corvette heads.

 

"perfered"

Is this a genuine typo, or a really backwards way of trying to make fun of someone who got the spelling correct to start with?

 

I know exactly why their prefferred, and have seen quite a few super stock heads after the modifications...

In fact the 487X heads is one of the BETTER large chamber heads out there. Personally, i know two people using those L98 heads & IMO they're junk. People seem to think they've got some sort of $ value, so you pay more in the beginning to get a head that cant outflow a 40yr design (487X)

So if your car is injected, the L98 heads would be the easier choice, and would keep your comp ratio up (if using a flattop)

Anyhow, my $0.02

 

wow, thanks for the input guys. i think i will sell the heads . know anyone who might want them?