Heads

77omega · 05-07-2008, 05:32 PM

I've got a 77 350 and i would like to change the heads to the earlier small chamber heads. Which heads do i want, were do i find them, and how much should i expect to spend? I don't want aftermarket heads. Thanks MIKE

Warhead · 05-07-2008, 09:07 PM

Where are you located???

#4,5,6,7,7a's would do what you ask, but they will have to be drilled to 17/32nd's for your larger 1/2 inch head bolt holes.

Figure bare castings at $100.
Shipping could be anywhere from $50-$100 depending where you live.
Drilling the bolt holes $25-$50 depending on the shop.
Get a valve job, no matter what.

I have 3 sets of 7a heads that I am willing to part with, but I'd rather do local pickup on these.
Jim in Phx.

77omega · 05-07-2008, 09:30 PM

Thanks for the info. Shipping from you to me may be costly, I'll try and see if i can find some closer.

77omega · 05-08-2008, 08:32 AM

Two more question, how hard are these heads to find and how do i identify them? Thanks

Warhead · 05-08-2008, 01:58 PM

The "#" will be to the left side of the #1 spark plug (or #8 plug).
#4's will have casting #394497 above the center exhaust outlets
#5's all -397742 above the center exhaust outlets
#6's all-403859 " "
#7's all-409147 " "
Check with core suppliers in your area.
Most machine shops know them, but will NOT give that information (or their phone #'s) out to customers.
Anything from a core supplier MUST be fully rebuilt. That means they will need EVERYTHING.
Jim in Phx.

05-07-2008, 05:32 PM	#1 (permalink)
77omega Junior Member Join Date: May 2008 Posts: 19	Heads I've got a 77 350 and i would like to change the heads to the earlier small chamber heads. Which heads do i want, were do i find them, and how much should i expect to spend? I don't want aftermarket heads. Thanks MIKE

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05-07-2008, 09:07 PM	#2 (permalink)
Warhead Senior Member Join Date: Mar 2008 Posts: 87	Where are you located??? #4,5,6,7,7a's would do what you ask, but they will have to be drilled to 17/32nd's for your larger 1/2 inch head bolt holes. Figure bare castings at $100. Shipping could be anywhere from $50-$100 depending where you live. Drilling the bolt holes $25-$50 depending on the shop. Get a valve job, no matter what. I have 3 sets of 7a heads that I am willing to part with, but I'd rather do local pickup on these. Jim in Phx.

05-07-2008, 09:30 PM	#3 (permalink)
77omega Junior Member Join Date: May 2008 Posts: 19	Thanks for the info. Shipping from you to me may be costly, I'll try and see if i can find some closer.

05-08-2008, 08:32 AM	#4 (permalink)
77omega Junior Member Join Date: May 2008 Posts: 19	Two more question, how hard are these heads to find and how do i identify them? Thanks

05-08-2008, 01:58 PM	#5 (permalink)
Warhead Senior Member Join Date: Mar 2008 Posts: 87	The "#" will be to the left side of the #1 spark plug (or #8 plug). #4's will have casting #394497 above the center exhaust outlets #5's all -397742 above the center exhaust outlets #6's all-403859 " " #7's all-409147 " " Check with core suppliers in your area. Most machine shops know them, but will NOT give that information (or their phone #'s) out to customers. Anything from a core supplier MUST be fully rebuilt. That means they will need EVERYTHING. Jim in Phx.