double hump heads on a 78 engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Coley · 02-02-2015, 08:22 PM

Be careful here...the '461's did not have the front accessory mount taps so you will need a '60's style alternator mount bracket that goes off the water pump, intake, etc. Trucks and cars since 1970 almost all used the accessory mount taps for various brackets.
They are a good head and will add some power and compression to your engine.
My two bits.
Coley

Mike C · 02-02-2015, 09:10 PM

Good advice above. You said your engine was a 78 but not what vehicle it's in. If it's a 69 or newer with a long water pump and passenger side alternator, you are asking for lots of other problems.

Once again, if your vehicle uses a long water pump, you would be better off buying brand new Vortec heads and intake IMO.

Five O · 02-02-2015, 10:29 PM

461 heads will perform like a vortec head. Looks like the spring pockets have been cut to fit the bigger springs. The springs might be too much for your cam. Are they drilled for 3/8 or 7/16 studs? Do you have the rockers for them? Do they have a home porting job hiding in there? Any cracks? You've got a few questions to ask

02-02-2015, 08:22 PM	#1
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	Re: double hump heads on a 78 engine Be careful here...the '461's did not have the front accessory mount taps so you will need a '60's style alternator mount bracket that goes off the water pump, intake, etc. Trucks and cars since 1970 almost all used the accessory mount taps for various brackets. They are a good head and will add some power and compression to your engine. My two bits. Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

02-02-2015, 09:10 PM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,739	Re: double hump heads on a 78 engine Good advice above. You said your engine was a 78 but not what vehicle it's in. If it's a 69 or newer with a long water pump and passenger side alternator, you are asking for lots of other problems. Once again, if your vehicle uses a long water pump, you would be better off buying brand new Vortec heads and intake IMO. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

02-02-2015, 10:29 PM	#3
Five O Registered User Join Date: Nov 2012 Location: crossville TN Posts: 13	Re: double hump heads on a 78 engine 461 heads will perform like a vortec head. Looks like the spring pockets have been cut to fit the bigger springs. The springs might be too much for your cam. Are they drilled for 3/8 or 7/16 studs? Do you have the rockers for them? Do they have a home porting job hiding in there? Any cracks? You've got a few questions to ask

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