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#1
02-25-2014, 05:52 PM
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I have a #46 head that has factory style 2.11/1.66 valves in it.
Coded 1974. All stock springs retainers with bottleneck screw-in studs. A take off. Only one head was on the core engine.
Did they make these heads with 2.11 intakes? I have 4 sets of # 46 heads on the shelf and all are 1.96 with press-in or screw-in studs. |
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#2
02-25-2014, 06:37 PM
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AFAIK those were all 1.96" intakes from the factory.
Seen plenty of #46's with screw in studs as mentioned,IIRC that was a mid year ('73) change where all heads after said change-over date became screw in studs,even the small valve #46's. At one time,I had one set of SIS #46's on the 350 in my late production '73 Ventura and two more spare sets of SIS #46's laying around (both '74 vintage). Good heads to add bigger valves to,as the seat material is nice and fresh when upgrading to the larger valves,essentially the bigger valves makes them defacto 5C-4's or 6X-4's for all intents & purposes,so yeah they're real nice "sleeper" heads IMO. Odds are that's what someone else did with that head. FWIW Bret P. |
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#3
02-25-2014, 07:18 PM
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didn't the 74 GTO get 2.11's? not sure on this, it has been a while since I looked at mine.
__________________
FREEDOM ISN'T FREE BUT WORTH FIGHTING FOR |
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#4
02-25-2014, 07:38 PM
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My 74 GTO had the smaller valves from the factory. I have heard that some of the 74 GTO's got the bigger intake valves.
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#5
02-26-2014, 07:58 AM
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I have a set of 69 428 2 bbl heads that have the 1.96" intake, but 1.77" exh.
All I can guess is that it was on the wrong part of the machining line for a while, of they ran out of 1.66" valves on that work shift!
__________________
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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#6
02-26-2014, 08:25 AM
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Quote:
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'67 GTO 400 HO - Ram Air - 4 speed - 3.55 Safe T Track, A/C, PS, red fender liners '78 Lemans - Drag car project |
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#7
02-26-2014, 08:42 AM
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I've seen at least a dozen sets of the #46 350 heads, and all have been the smaller valves. The early heads did have pressed in studs, then at some point they started installing screw in studs in them.
Those heads are excellent heads for a 455 pump gas engine project. A few years ago we build a 455 with a set of them, didn't port them anyplace, not even a gasket match, but did open them up for the 2.11/1.77 valves. The engine got good rods and pistons, zero decked, and Crower 60919 cam. First pull on the dyno was 440hp/528tq. The engine wasn't max-effort, just ran it in on the dyno and made one pull to see where it was at. I wished now I'd have spent more time with it, I'm sure there was at least another 10hp or so in tuning, spacers, and/or high ratio rocker arms on it.......Cliff
__________________
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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#8
02-26-2014, 08:43 AM
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Yea, I think that the factorys did whatever they had to in order to meet the needed production numbers for the day!
the added 25 cent cost for sending out a to the line a set of heads with screw in studs made perfect sense when compared to a car dealer somewhere not getting a car in there order.
__________________
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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#9
02-26-2014, 09:51 AM
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#46 heads
Ken, what's the date code on the heads? I think the 74' GTO 350 heads got the bigger 2.11 intake valves like the 4X 4 bbl heads did that year. The earlier 69 model #46's got the small 1.96 valves, even with a 4 bbl.
__________________
62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#10
02-26-2014, 10:46 AM
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What's the secondary code on it?
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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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#11
02-26-2014, 01:28 PM
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The 69 428 four bbl motors got the 16 head.
__________________
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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#12
02-26-2014, 01:45 PM
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Except for the 360HP 428's, which got the pressed in stud small valve #46 heads. I've purchased and owned half a dozen 1969 428 360hp engines over the years, and all had the same set-up for cylinder heads.
Those #46 heads are excellent as are the later #46's from the 350's. As a last ditch effort two years ago to get a car ready for Norwalk with less than a week to go, we grabbed a set of 1969 #46's from under the workbench to complete a 455 build. Grabbed a used Crower cam off the shelf as well. The heads got better springs and screw in studs, valves/seat ground, nothing else. Not even a gasket match. The 455 went into a 1981 Firebird, TH350, unknown CL converter, and 4.10 gears. It went 11.90 on the first pass at 112mph, in the heat of August! So much for 45 degree intake seats and small valve heads not working well......Cliff
__________________
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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#13
02-26-2014, 08:36 PM
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Quote:
Like I posted in the first post. Last number of the date code is a 4 so they are 1974 castings. They look to be original with no under the seat cutter work. I have early #46's, both screw-in and press fit smaller valves. I have another set of date coded 1974's and they are small valve screw-in studs. Just kinda weird to me. I can make a match but was wondering if maybe it's a factory production 1974 head. If I get time I will post pics. |
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#14
02-27-2014, 07:10 AM
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Pretty cool stuff Ken, sounds like you may have found a factory original large valve #46 head. Too bad you don't have the mate to it, would save some additional work. I would run the cutter into both heads if you make a matching 2.11 intake valve head for it. The factory may have used different angles into the bowl/throat. Not sure what type of seat grinding equipment that you use, I still use old Black and Decker stones here, so I can easily cut a stone to duplicate any angle for bowl hogging the heads for larger valves......FWIW.....Cliff
__________________
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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