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#1
01-20-2019, 07:38 PM
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help with identifying intake valves
I traded out some work for a bunch of Pontiac parts. these intake valves were in a box. they are 2.11 tulip valves and look like they have never been installed. the swirl marks are very visible and there in not a spec of carbon. on the stem there is the word "spec" stamped on one side and "1974" imprinted on the other side. anyone familiar with these?
    
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#2
01-21-2019, 05:16 AM
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How long are they? 2.11" valves came in several different lengths, the early stuff was apprx .100" longer than the later smog heads with deeper chambers........Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#3
01-21-2019, 05:41 AM
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Tuliped stems with dimpled heads were originally RAIV pieces. Those could be factory replacements for the RAIV valves. The RAIVs were swirl polished as well. Look just like those. Not sure how long they were, but longer than standard D-port valves.
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---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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#4
01-21-2019, 08:51 AM
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Just note that factory valves where available in several stem oversizes so even though they may be new , they may not be a drop in!
Does the stem measure .342"?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#5
01-21-2019, 10:27 AM
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Look like Speed Pro RAIV replacements. Probably what the SP is.
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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