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#21
08-06-2021, 07:40 PM
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Yep
the 400 block and swap the #64 Heads (87cc) would be a great low octane combo. If the #12 heads were factory on the 70 400 block -it will likely be a 4Bolt Main 400 block. (WT or WS or YZ block code) The #46 heads from the 350 would be great on the 455 that 455 should also be a 4Bolt Main block |
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#22
08-06-2021, 07:44 PM
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The 455 would only be a 4 bolt main if it started life with a 4 bbl.
__________________
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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#23
08-06-2021, 08:51 PM
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ALL the 1970 455's with #64 Heads were 4Bolt Main Blocks
That is what he stated to have. those were the "H.O." in 1970 mid 70's "might" have had a 2bbl 455 - have never seen or heard of one though. |
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#24
08-06-2021, 08:57 PM
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455 200 hp 2-barrel engine was 1972 only, it used 7L4 heads and the 066 cam.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#25
08-06-2021, 09:38 PM
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if you wanna go fast with a 350, you’re gonna need a chevy.
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#26
08-06-2021, 09:50 PM
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Quote:
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#27
08-06-2021, 11:15 PM
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There was a 2bbl 455 in `71 also. 280 hp.
-28.jpg)
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#28
08-07-2021, 08:11 AM
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Quote:
 Jon
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#29
08-07-2021, 08:29 AM
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And all the 455 motors with the 64 heads where 4 bbl motors, so where am I wrong?
I mean we can go off into the weeds and talk about the non HP cars with 400s and 455s that due to a shortage started life with 4 bolt main blocks just to get them out the door and sold, but that was by far the exception, and not the norm! What I should have posted was that up to 1973 all non SD 455 motors with a 4bb where 4 bolt main . The biggest handicap the Pontiac 350 has as compared to the SBC 350 is the much larger weight of the factory rods and pistons !
__________________
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! Last edited by steve25; 08-07-2021 at 08:40 AM. |
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#30
08-07-2021, 10:58 AM
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Quote:
I didn't speak up earlier because there are many here more knowledgable than my self (many of which have first hand knowledge). As I recall, between 1971 & 1974 the only legitimate four bolt main 455's were the 71-72 HO, and 73-74 SD blocks; The rest were drilled and tapped for four bolt mains, but only used two bolt main caps. I do believe that after 1974, the only ones drilled and tapped were SR blocks.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#31
08-07-2021, 11:30 AM
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unruhjonny is correct. |
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#32
08-07-2021, 12:26 PM
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It's hard for me to believe that anybody would post this on this Pontiac forum. (1) Just yesterday, Brad Koivisto was the #1 Stock class qualifier, at the Indy Lucas Oil Series race, in a 350 Pontiac powered '74 GTO. Ran a low 11. The car has run 10.80's, IIRC, in legal Stock form. '74 GTO's have set & reset national records, & won their class at lots of races, for their entire history. (2) Member here, Adam Strang, ran well down into the 10's, in his '68 Bird Stocker, running a 350, with #18 iron heads, an iron intake & a 750 Q-jet. . (3) Bill Rink ran so quick with his '74 GTO Stocker that NHRA upped the hp rating to past 270hp. Bill then switched the car over to Super Stock. In SS, he has won class at Indy, several times. (4) Mike Morgan has a veteran 350 Pontiac powered '77 Formy Super Stocker. I think it has actually run a little quicker than Bill Rink's GTO. Can't remember, for sure, but I think both cars have run below 10.50. And this is with 6x-4 iron heads & a Q-jet. Bill Rink's car has #46 iron heads, with a 750 cfm Q-jet. (5) My Pontiac friend won LOTS of dirt track races, driving his 350 Pontiac powered cars against 350 sbc powered cars. Hey, I could go on & on. But, I think everybody can get the picture. A Pontiac 350 can be built to make good power. Can also be built to power competitive Stock & SS drag cars. |
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#33
08-07-2021, 12:41 PM
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"The biggest handicap the Pontiac 350 has as compared to the SBC 350 is the much larger weight of the factory rods and pistons !"
Crank, rods, pistons much heavier and bore to stroke ratio not as good. Doesn't mean a Pontiac 350 woln't make power. The first big hurdle is getting some "squeeze" in them. Compression is power with these engines, so is CID. So if you want "big" power build a big engine. If you want a powerful big engine put some compression in it. If you build a little engine higher compression is NOT an option. Low compression 350's, Pontiac, Chevy or otherwise are "turds" for power production (torque). To complicate the issues a "low" compression 350 build does NOT allow for much camshaft or you just turn it into a bigger turd for power, idle quality, power right off idle, etc. I've built a good many SBC's, and even drag raced one for nearly 10 years in a 1965 Nova SS, quite successfully I might add. That was decades before finding this site and the Internet wasn't even on the horizon. I like to see at least 10.2 compression in a 350 SBC build, 10.4 to 10.6 even better. They absolutely LOVE super tight quench and small well shaped combustion chambers. Put all that together and about all you have to do then is pick the right cam and it's game on. You can fall out of a tree and make 1hp/CID and without much effort using the right parts your in the 380-430hp range with an SBC 355cid build on pump gas with good idle quality and street manners. If you are a Pontiac or other brand loyalist, the little SBC is an engine you'll have trouble keeping up with trying to do the same thing, but it can be done with some good planning and careful parts selection...........Cliff PS: with Class racing stuff you can be competitive with some engines folks typically consider "door stops". I've seen 283 2bbl engines make some very remarkable runs in Stock Classes. One of them used to race out of our local track, it was in a mid 60's Biscayne wagon nearly as I can remember, heavy non the less, and a little 283, 2bbl that yanked the wheels in the air and made some pretty quick runs for what it was..........FWIW.....
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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), |
| The Following User Says Thank You to Cliff R For This Useful Post: | ||
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#34
08-07-2021, 01:23 PM
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#35
08-07-2021, 01:49 PM
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Quote:
They are known in stone as 4Bolt Blocks 4bbl carbs are all they came with on any 1970 455 -so the 4bbl comment seemed really strange about it. Quote:
now thats where it really just falls off the charts we dont even need to discuss that call it a typo made in a rush - and maybe you meant Drilled-Only  Quote:
ZZ WW WT fwiw |
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#36
08-07-2021, 02:15 PM
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Lol!
Ok let me try again, other then the 75 to 76 455 motors any 4bbl 455 that had a manual trans behind it would be a 4 bolt main. Boring a 350 .060” over gets you to within ,060” of the SBC and to a nice 365 cid number.
__________________
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! Last edited by steve25; 08-07-2021 at 02:22 PM. |
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#37
08-07-2021, 04:11 PM
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Quote:
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#38
08-07-2021, 04:15 PM
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Were some 1970 445s (particularity early ones) that had 2 bolt mains and were many in for warranty work.
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#39
08-07-2021, 04:45 PM
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Quote:
https://forums.maxperformanceinc.com...81&postcount=8 |
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#40
08-07-2021, 05:00 PM
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The OP mentioned 400 hp as his power goal although if he uses the 400 block he can easily exceed that goal and not overwhelm his chassis. It's generally accepted here that two bolt mains will handle 600 hp so all the
 about which 455's have 4 biolt mains, to me, is unnecessary since the OP's power goals are well within his engine blocks' capabilities. I have to agree with with post #18 on this subject. Use the 400 and the M20 and he's in business (FWIW)
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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