460 heads
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Junior User
Joined: May 2000
Posts: 95
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From: Louisiana
460 heads
I have a 79 460 engine with the D3VE-A2A heads. Can anybody tell me the stock compression with these heads?..and can anybody tell me How I can get a 10:1 ratio with these heads? Getting a set of the early 70s heads is probably out of the question! 
49 F-1 (soon to be 460 powered streetrod)
50 F-1
83 F-150
94 Explorer
95 Mustang
If you listen on a quiet night..you can hear a Chevy rust...F-1s FOREVER
49 F-1 (soon to be 460 powered streetrod)
50 F-1
83 F-150
94 Explorer
95 Mustang
If you listen on a quiet night..you can hear a Chevy rust...F-1s FOREVER
Senior User
Joined: Oct 2000
Posts: 227
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From: arkansas
460 heads
your compression is around 8.2-8.5. the heads have 92cc chambers. you will need to look at some aftermarket flat-top pistons to arrive somewhere close to 10:1, or use the early small-chamber heads. these heads have 72cc chambers, and with stock pistons will give around 9.5 compression.
Senior User
Joined: Nov 2000
Posts: 231
Likes: 2
460 heads
Mavman is right, you will need flat top or a slight dome in your pistons to achieve 10 to 1 or greater comp. ratio from your 92 cc heads. The 72 cc heads Mavman was referring to are the RARE CJ or SCJ heads casting #DOOE. Ford also made late 60's to early 70's 429-460 heads that had 75-77cc chambers. They are under different casting #'s C8SE, C8VE, C9VE, DOVE-C. These heads have the same size valve diameters as your "D3" heads @ Intake 2.08", Exhaust 1.66", but the overall valve lengths are different because of rocker arm change in '72.
These early heads also do not have the "emission port tube" on the exhaust side of the head as your "D3" heads. The early heads also use the larger size spark plugs(18mm-13/16 compared to 14mm-5/8). In looking at my Federal Mogul catalog if you have a stock bore 460 w/ 92cc heads PN L2443NF will give you approx. 10.43 to 1 C.R.
If you use the same block & 77cc heads PN H535P will yeild approx. 10.29 to 1 C.R. These numbers will change depending on year of manufacture of the block due to deck height increases. I hope this helps.
Todd
BB79RANCH
These early heads also do not have the "emission port tube" on the exhaust side of the head as your "D3" heads. The early heads also use the larger size spark plugs(18mm-13/16 compared to 14mm-5/8). In looking at my Federal Mogul catalog if you have a stock bore 460 w/ 92cc heads PN L2443NF will give you approx. 10.43 to 1 C.R.
If you use the same block & 77cc heads PN H535P will yeild approx. 10.29 to 1 C.R. These numbers will change depending on year of manufacture of the block due to deck height increases. I hope this helps.
Todd
BB79RANCH
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