New heads or rebuild for a 390?

91tbrick · June 16th, 2008, 02:07 AM

My dad and I have decided to overhaul the engine in his 67 GTA and need to decide how to deal with it. Car used to be a consistant 2nd/3rd place show winner until the engine caught fire. Right now it gets 6-10mpg, leaks oil and in general needs an overhaul. The plan is to yank it, strip it, all new gaskets and somehow make it run unleaded fuel, it's this last part I need the help with. My brother in law suggested simply replacing the heads with new aluminum versions which seems like a simple solution BUT, will this effect the car's status for show? Will we need to get different cams? What are the downsides and cost. The other option is of course to have the old ones rebuilt with hardened valve seats, maybe shaved to raise compression. Just looking for some answers.

460brevill · June 16th, 2008, 09:59 AM

get the heads done for unleaded gas.rebuild the block and keep on trucking.

MustangOne · June 16th, 2008, 11:15 AM

Rebuild your old heads, Your looking to add harden seats. That is what makes the head run well on the unleaded fuel we have now. Harden seats take higher heat of the no lead fuel.

You can have both heads Rebuilt for about $600.

With the car being a S code it is worth alot more with the correct heads.

June 16th, 2008, 02:07 AM	#1
91tbrick Newbie Join Date: Nov 2006 Posts: 4	New heads or rebuild for a 390? My dad and I have decided to overhaul the engine in his 67 GTA and need to decide how to deal with it. Car used to be a consistant 2nd/3rd place show winner until the engine caught fire. Right now it gets 6-10mpg, leaks oil and in general needs an overhaul. The plan is to yank it, strip it, all new gaskets and somehow make it run unleaded fuel, it's this last part I need the help with. My brother in law suggested simply replacing the heads with new aluminum versions which seems like a simple solution BUT, will this effect the car's status for show? Will we need to get different cams? What are the downsides and cost. The other option is of course to have the old ones rebuilt with hardened valve seats, maybe shaved to raise compression. Just looking for some answers.

June 16th, 2008, 09:59 AM	#2
460brevill Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 879	get the heads done for unleaded gas.rebuild the block and keep on trucking. __________________ i sixing 200 six with 300 hp.

June 16th, 2008, 11:15 AM	#3
MustangOne June 08 ROTM 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 515	Rebuild your old heads, Your looking to add harden seats. That is what makes the head run well on the unleaded fuel we have now. Harden seats take higher heat of the no lead fuel. You can have both heads Rebuilt for about $600. With the car being a S code it is worth alot more with the correct heads. __________________ www.Mustang1.Com

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