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#1
06-17-2004, 02:20 PM
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what compression would i have with #16 on a 72 455
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#2
06-17-2004, 02:20 PM
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what compression would i have with #16 on a 72 455
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#3
06-17-2004, 02:29 PM
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If it's the early 400 heads,about 11 to 1 cr.
If it's the SD heads about 8.4 to 1 cr.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#4
06-17-2004, 07:38 PM
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I have 16's on my 455 and it has 12:1. Course mine has a 4.21 bore and a 4.25 stroke, and the heads may have been milled a tad, and only has 2 valve reliefs on top of the pistons unlike the Seal Pro pistons. If I zero decked the block I'd probably get about 12.5:1.
Tim C
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Tim Corcoran |
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#5
06-17-2004, 09:07 PM
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I'm using #16 heads on my 455 and used Keith Black Hyperutectic dished pistons to accomplished a pump gas friendly 9.49:1 CR. I can provide part #'s for these pistons if your interested in my build up.
Regards,
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Larry Metzger Columbus, NJ 1968 GTO Verdoro Green Hardtop 1969 GTO Palladium Silver Hardtop 1969 Judge Carousel Red Hardtop X 2 Someday We'll Look Back On This And It Will All Seem Funny. From Rosilitia, Sung By Bruce Springsteen, CIRCA 1973 |
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#6
06-17-2004, 10:41 PM
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68, That is a great picture. You have some beautiful cars. Then again I'm partial to 69's
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You know it's going to be a good day when you wake up breathing! |
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#7
09-24-2022, 08:55 AM
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Quote:
Thanks, Monty |
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#8
09-24-2022, 09:07 AM
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There’s also a 1970 small valve 16 head.
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#9
09-24-2022, 09:33 AM
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If your 16 castings are pressed in rocker stud with the 1.96/ 1.66 valves sizes then the chambers are way more like 75 CCs, not 72 if they have not been milled any.
If they are pressed in stud then you want to stay away from cam lifts of over .450” at the valve. This is for two reasons, so you don’t pull the stud out and due to the stock coil bind spec of the valve springs.
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I do stuff for reasons. |
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#10
09-24-2022, 11:22 AM
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Quote:
I have some 1970 16 heads and I cc them at 78 and you can pull pressed-in studs and tap for the 7/16 studs, can't you? If you put new valves 1.77 and 2.11 I am sure it would be closer to 72cc Jim
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Jim Moshier 1971 Grand Prix 462ci SD Performance 6x heads 1962 Catalina 389 1968 Firebird 400-455 I haven't decided "If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan Last edited by Jim Moshier; 09-24-2022 at 11:44 AM. |
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#11
09-24-2022, 11:43 AM
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Yes, if he has pressed in studs they can be yanked like a bad tooth and then they can be drilled and taped for screw in studs.
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I do stuff for reasons. |
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#12
09-24-2022, 11:55 AM
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Quote:
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- Mike  '69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters '68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles |
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