487 vs. 487X heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brennecke · 06-10-2002, 10:16 AM

I scored a set of 487X heads for nothing (found 'em in the dirt near a guys workshop, asked and they are mine). I had them magnafluxed, and they aren't cracked. My truck currently has 487s on. My question is whats the diference between the two sets? I was told origionally that the X meant big valves, but I measured, and they are 1.94, 1.5. Somebody else said that the X heads were meatier and could be ported more. From what I can see, they may need porting, but there's no need to do any port matching. The intakes are huge, and the exhaust ports are as big as can be without being bigger than the gaskets.

Any clue?

ckhd · 06-10-2002, 12:59 PM

The X means 10 extra CCs in the intake runners - at least that's what I've been told.

brennecke · 06-10-2002, 05:06 PM

Thanks. That's what I was afraid of. Nothing special. Anybody know a place where I could find out for sure?
or find a dyno200 flow file for them?

lux hauler · 06-10-2002, 05:36 PM

I have the same heads.
I hope you have better luck getting good info than I did.
One thing I did find out......it will cost approximately $550 to completely rebuild my 487X's. I can buy a new set of Vortecs for just about the same money.
If you find anything about those heads, let me know.

gaddman · 06-11-2002, 12:02 AM

Try http://cylinder-heads.com/main.html ....call and ask for Bob Metz. I have the 487x heads too, and they rebuilt them with ALL new parts for $300. Cost me $40 to ship them UPS. Have not got the motor running yet, but they look great and service was great. They had them back in a week.

Greg

06-10-2002, 10:16 AM	#1
brennecke Registered User Join Date: Apr 2000 Location: Missouri Posts: 469	487 vs. 487X heads I scored a set of 487X heads for nothing (found 'em in the dirt near a guys workshop, asked and they are mine). I had them magnafluxed, and they aren't cracked. My truck currently has 487s on. My question is whats the diference between the two sets? I was told origionally that the X meant big valves, but I measured, and they are 1.94, 1.5. Somebody else said that the X heads were meatier and could be ported more. From what I can see, they may need porting, but there's no need to do any port matching. The intakes are huge, and the exhaust ports are as big as can be without being bigger than the gaskets. Any clue? __________________ Never tire of doing what is right II Thess. 3:13 Northeast Missouri 71 LWB original 350 3/speed Soon to be 500

06-10-2002, 12:59 PM	#2
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	The X means 10 extra CCs in the intake runners - at least that's what I've been told. __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

06-10-2002, 05:06 PM	#3
brennecke Registered User Join Date: Apr 2000 Location: Missouri Posts: 469	Thanks. That's what I was afraid of. Nothing special. Anybody know a place where I could find out for sure? or find a dyno200 flow file for them? __________________ Never tire of doing what is right II Thess. 3:13 Northeast Missouri 71 LWB original 350 3/speed Soon to be 500

06-10-2002, 05:36 PM	#4
lux hauler Psycho-billy Member Join Date: Jul 2001 Location: about 40 miles west of Cleveland, Ohio Posts: 2,591	I have the same heads. I hope you have better luck getting good info than I did. One thing I did find out......it will cost approximately $550 to completely rebuild my 487X's. I can buy a new set of Vortecs for just about the same money. If you find anything about those heads, let me know. __________________ '72 C-10 350 w/Lunati Voodoo cam (207/213, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American (or Canadian).

06-11-2002, 12:02 AM	#5
gaddman Registered User Join Date: Apr 2001 Location: Scottsburg, In Posts: 160	Try http://cylinder-heads.com/main.html ....call and ask for Bob Metz. I have the 487x heads too, and they rebuilt them with ALL new parts for $300. Cost me $40 to ship them UPS. Have not got the motor running yet, but they look great and service was great. They had them back in a week. Greg __________________ Gaddman Scottsburg, In 67 SWB w/93 step bed 68 LWB Fleetside C10 Custom 50 Chevy 3600 74 Norton Commando 850 72 Norton Commando 750



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