head question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 10-27-2005, 11:09 PM

my heads are 487casting can anyone fill me in on what this means?

4x4Poet · 10-28-2005, 03:54 AM

Looks like they came in different configurations depending on the model they came on:

3973487...350...71........CORVETTE...330,270 HP
3973487...350...71-76...PASS, CAMARO, CHEVELLE, NOVA,MONTE CARLO...SMALL PLUGS
3973487...350...71-76....TRUCK.......LIGHT DUTY
3973487...350...72........CORVETTE...200,255 HP

76cc iron heads. Good, but not great flow, by any day's standards, but a little judicious porting around the bowls, especially the exhaust bowl, brings out some decent performance. I think they are a good truck engine head for 4x4s.

torquepower · 10-28-2005, 04:32 AM

One of the better open chamber smog heads. If you can get vortecs thats the way to go. Interesting info here.
http://www.castheads.com/factory_chevy_open_chamber.php

4x4Poet · 10-28-2005, 06:01 AM

Quote:

Originally Posted by torquepower

...Interesting info here.
http://www.castheads.com/factory_chevy_open_chamber.php

Interesting, indeed. I'd like to know their tricks to keep the porting from showing.

WILD prices, though..

mplex2000 · 10-28-2005, 09:06 AM

Gene Quick out here used to do that for Terrell Auto Supply (he raced some kind of dirt track cars where they couldn't used modified heads).

I think it's called cheating lol.

torquepower · 10-29-2005, 03:42 AM

"I think it's called cheating lol."

I prefer to call it creative engineering.

10-27-2005, 11:09 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	head question my heads are 487casting can anyone fill me in on what this means? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

10-28-2005, 03:54 AM	#2
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Looks like they came in different configurations depending on the model they came on: 3973487...350...71........CORVETTE...330,270 HP 3973487...350...71-76...PASS, CAMARO, CHEVELLE, NOVA,MONTE CARLO...SMALL PLUGS 3973487...350...71-76....TRUCK.......LIGHT DUTY 3973487...350...72........CORVETTE...200,255 HP 76cc iron heads. Good, but not great flow, by any day's standards, but a little judicious porting around the bowls, especially the exhaust bowl, brings out some decent performance. I think they are a good truck engine head for 4x4s. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

10-28-2005, 04:32 AM	#3
torquepower Registered User Join Date: Sep 2005 Location: Mission, BC Canada Posts: 31	Re: head question One of the better open chamber smog heads. If you can get vortecs thats the way to go. Interesting info here. http://www.castheads.com/factory_chevy_open_chamber.php __________________ 71 GMC 3500 Longhorn 454 72 GMC 2500 Sierra 350 69 C20 Longbox fleetside 305 68 C10 Shortbox Stepside 250 94 Chevrolet K1500 Cheyenne 350 88 GMC K1500 Last edited by torquepower; 10-28-2005 at 04:35 AM.

10-28-2005, 09:06 AM	#5
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	Re: head question Gene Quick out here used to do that for Terrell Auto Supply (he raced some kind of dirt track cars where they couldn't used modified heads). I think it's called cheating lol.

10-29-2005, 03:42 AM	#6
torquepower Registered User Join Date: Sep 2005 Location: Mission, BC Canada Posts: 31	Re: head question "I think it's called cheating lol." I prefer to call it creative engineering. __________________ 71 GMC 3500 Longhorn 454 72 GMC 2500 Sierra 350 69 C20 Longbox fleetside 305 68 C10 Shortbox Stepside 250 94 Chevrolet K1500 Cheyenne 350 88 GMC K1500



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