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Post Info TOPIC: Swapping my Big block heads over


Poncho Master!

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Posts: 1642
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Swapping my Big block heads over


hey hey!

for the big block peeps, I am changing my heads. Tight budget and want to get a little more bang. presently running 781 heads in standard form. Good heads with hardened seats. Also have a pair of 049 heads spare on the shelf, also good heads but not hardened seats standard form. Both type heads are decent heads, preferred heads for a street car and for performance. Both 781 and 049 are oval port, open chamber.

have picked up a pair of very very low milage heads from a 502. Intake runners same size, exhaust outlets slightly smaller, but not by much.

But, also has larger valves and are closed chamber heads. Hoping to get a little bit of a gain over the existing heads.

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cutting a roof off a four door is NOT a convertible.....

65 Parisienne convertible.one of 49 built for RHD export market,402BBC, T400, 2500 stally, posi rear, upgraded brakes with front discs, old proflo efi custom built by me.



Canadian Poncho Superstar!

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Posts: 5889
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How much of an increase in compression ratio are you expecting with the closed chamber heads?

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70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop
72 GMC Sierra

 

 



Poncho Master!

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Posts: 1642
Date:

seventy2plus2 wrote:

How much of an increase in compression ratio are you expecting with the closed chamber heads?


 Not sure, havent had the opportunity to figure it out yet.



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cutting a roof off a four door is NOT a convertible.....

65 Parisienne convertible.one of 49 built for RHD export market,402BBC, T400, 2500 stally, posi rear, upgraded brakes with front discs, old proflo efi custom built by me.

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