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440HP & 440 standard questions. Need info
First of all is there any way possible to tell a 440HP motor from a 440 6-Pack motor without the intake or tearing the motor down?
What is the difference between a 1967 440Hp and and 1967 440 standard. What was changed between a 1967 440Hp and a 1970 440HP. What is the best set of heads for 440hp and the numbers. |
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Theres not a whole lot of difference betwen HP and family car application engines in the early years.Windage try and heavier valve springs and a little more cam is about it.Should have a C for 67 and closed chamber heads in that year.Im not sure if there was a 6 pak option but there was for sure in 68.6 pak rods are heavier than the rest also.The 70 version has open chamber heads with larger valves compared to 67.
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There was no 6 pack version in 68. The 6 pack started as a 69½ option.
In 1967, the HP and non HP heads were the same closed chamber head. In 1968 the B/RB engines went to the open chamber 906 head. They changed the piston, to make up for the open chamber head. As far as I know, the HP engine didn't get the windage tray until 1968. I did forget to mention that the HP engine has a different cam |
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There is no way to tell a 6-pack from a HP long block without disassembly.
In '67 the HP and standard 440 both had the same compression ratio (10.1-1). The HP got a better cam, larger exhaust valve, high flow exhaust manifolds and improved spark and fuel. The main differences between the '67 and '70 HP 440 are different heads ('68-'70 are open chamber), windage tray, heavy rods and bigger carb. The '70 motor actually has less compression than the '67 (9.7-1) because the '67 piston was used in the '70 motor with larger combustion chambers. |
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So pistons are the same from 67 to the start of the smogger years then?
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No, '67 and '70 pistons are the same, '68-'69 are the same.
'67 got it's compression from small chambers, '68 and '69 had open chambers and needed a taller piston to maintain the 10.1 CR. '70 was the first year of the reduced compression (emissions) so the '67 piston was used in the '70-'71 with open chambers to bring the compression down to 9.7. The exception was the 6-pack which remained at 10.5-1. |
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Thanks-I get it now.
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As for a 6-pack motor I was looking to purchase a used one. |
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So what was the difference between the 67 440Hp cam and the 67 440 Non HP cam? |
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Then when I am done I will be building a 440 HP 4-speed car So I will need info for both. The automatic car will have either a 2500 to 3500 stall converter, and shift kit in a 727. But with plans on driveing it on very, short trips around town. The 4-speed car will have a low geared rear end and more of a mild strip car. |
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