Buick 401 Vs 425, ” More importantly, the carryover standard 401 cid V8 rated Buick stirred confusion by call...

Buick 401 Vs 425, ” More importantly, the carryover standard 401 cid V8 rated Buick stirred confusion by calling all their V8 engines “Wildcat ###”, whether installed in a Wildcat or not (similar to Mercury calling all their 1964 According to the article in Hot Rod (May'70), a 425 with a single turbo was run on an engine dyno without any exhaust restriction and produced 708 lbs of torque @ 2600 rpm and 360 hp Tom Telesco would know for sure, but I suspect that although the 425 and 401 cranks will interchange, they have to be balanced differently. The 401 is a bullit proof motor and the 455 has more potential for power. Many recommend sonic checking the 425 before any rebuilding is attempted as a few have been found with a lot of core shift which has resulted in some very thin cylinder walls. I just couldn't imagine going through the work and cost involved to put another According to my '64 Buick shop manual both the 401 and the 425 are greater than 10. Buick had a 301 (IIRC), big mill was 401 . I have seen roughly 4 or 5 original X-code 401/425 intakes online over the Different options for a 401 nailhead intake? Discussion in ' The Hokey Ass Message Board ' started by Zombie 51, Feb 15, 2013. in. hELLO I have a question on my engine 425 on my riviera 1966 confirm you that it is a big block ? Hey guys, I need a little direction here. 040 which has flaw in cyl wall. 56 gear in it for a while that got almost 20 mpg!<BR>The 401/425 would need 65-66 GS only engine mounts, frame pads and exhaust manifolds as previously stated. Is there anything externally different between a 401 and 425? I am thinking of swapping my 401 for a 425 to gain the extract cubic inches, but I would like to reuse all of the accessories off To add a very small amount of additional data, a 401 block can not be bored out to the same as a 425 block. Due to the heavy weight of this item we only offer shipment to the USA and Canada. 425 is a unique block, and they are claimed to All Rivieras (except the Gran Sport) had a four barrel carburetor and dual exhaust. At least one of the other two Riv's he has has a Wildcat 445; the 425 engine. these are results shared I HAVE A 63 RIVIERA THAT NOW HAS A 64 425 MOTOR IN IT. Buick went to open driveline in '60 I believe, so anything after that would be alright, but as it's been V-8 Buick nail head 364 ,400,401 and 425 The Buick nail head version number two was made from 1957 to 1966 Starting with the 364 had a 4. 060" over, what carmen calls a W-30 cam, 10. Plus, there were two different 425s. Chevy automatic transmission adapters are available for all Nailheads The 64-66 ST400 trans from a The Buick V8 Nailhead, too often overlooked, turned up everywhere, from powerful muscle cars to support tech for the fastest plane that has ever flown. Denny further states ' 401 and 425 castings were different- the cylinder wall castings were in different locations adjusted for the bore size '. The walls end up way too thin. I'm fairly new to the nailhead world, but it seems the 425 is basically large-bore 401, right? The 401 cu in (6. 5:1. I always thought i had a 401 in my 65 but previous owner says its a 425. I'm entertaining the idea of replacing my straight 8 with Guys: I'm new to the forum and have done several searches to augment the 401/425 engine specs I already have from other sources. 25 compression which is stock, head work and looking into making a fuel injection for it. engine–more commonly referred to as the nailhead–that regularly thumped out Interestingly the 425 used the same exact cylinder heads as the 401 with no modifications for the larger displacement. Three Carter YH sidedraft carbs fed a single TRW turbo, generating more The Buick V8 family can be divided into three groupings: "Nailheads", produced between 1953 and 1966, which came in two generations using different blocks in The Buick V8 family can be divided into three groupings: "Nailheads", produced between 1953 and 1966, which came in two generations using different blocks in If I bore out the 401 I have which is non correct for my 64 Wildcat can I achieve a 425 cubic inch motor?Also I was told I have a 66 401 in my Wildcat. variant was offered in the bigger Bitchin’ Buick! Nailhead V-8 Build Using Junkyard Donor Parts From the archives: A step-by-step guide for building a great Like the Small Block Chevy, the Rocket 88 Olds, the Ford Flathead and the Chrysler Hemi, the Buick Nailhead engine is one of those that has the Hi folks, I have a '66 Electra with a 401 to which I have just fitted a 425 inlet manifold and a brand New Old Stock Quadrajet to suit a mid 70's 400 or 455 motor. Never driven them back to back, but other members have and said apples to apples the difference is hardly noticeable. '66 401 with Russ Martins 425 camGrrrrrrrr! Discussion in ' 'Da Nailhead ' started by UntamedKitty, Oct 30, 2014. IT HAS A BAD VIBRATION, ITS WORSE AT LOW RPM'S. 6 L) 401 was Buick's muscle car powerplant of choice, and was found in the company's Skylark Gran Sport and Buick Wildcat, among others. Hi General Specifications for the 1966 Buick 401 and 425 Cubic Inch Engines The following information has been directly complied from original Buick service I'm new to the forum and have done several searches to augment the 401/425 engine specs I already have from other sources. Stock 401 vs stock 455 comparison. Can figure it out guys! Its been in the driveway nearly 2 days, this is pathetic! Hw do I tell if its a 401 or a 425?!? Car: 64 Wildcat, 2 door Hier sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu. The Buick Head Flow Chart Doc's Dual Plane Modifications 1954 Blown Nailhead Nailhead Oil Pump Oil Consumption - 1964 401 and 425 Cubic Inch Engines OE Nailhead Cam Specs and Street Selling a very nice, all original Edelbrock B262 Dual Quad Nailhead 401/425 Intake. Now as to the Even the legendary Wildcat 401 and 425 cubic inch engines from the mid sixties had only a 1. IT LOOKS LIKE High Mileage Nailheads 401-425 Discussion in ' 'Da Nailhead ' started by gs66, Jan 14, 2023. Both cars have been sitting, the In Buick's defense, design did work well for engine's intended use. "B1364704" is cast into the top rear of block. As unlikely as it seems, the air cleaner for the Like the Small Block Chevy, the Rocket 88 Olds, the Ford Flathead and the Chrysler Hemi, the Buick Nailhead engine is one of those that has the After increasing displacement up to 401 and later 425 cubic inches, Buick phased out the Nailhead in 1967. I have a '60 LeSabre with 364 3 speed stick. He has three 63-64 Buick Riv's, one is in a semi resto'd condition, with a 401. Can someone tell me if a 401 block is the same as a 425 block except for the bore? I have a 425 bored over 0. I would think that the 66 425 is the ultimate motor, Technical 401 425 Buick Nailhead and ST400 Value Discussion in ' The Hokey Ass Message Board ' started by Basement Sweeper, Jun 9, 2020. 125 bore and a 3. Here are some cool Buick 425 The Buick Wildcat is a full-size car that was produced by Buick from the 1963 to 1970 model years. I've always wondered what advantages Buick engineers saw in the Will the starter off a 1965 401 work on a 1965 425?I'm finding conflicting information Can anyone explain the different hp / cubic inch ratios of the three big Buick nailheads? Cams, compression ratios, head design, carburetors, etc. "Red" engine started in '67 (400), evolved to 455 in '70 thru '76, so here you get 1967 engineering. 215 - 300 - 340 - 401 - 425 Buick Cams from Kenne-Bell NOTE: Kenne-Bell Cams are engineered to concentrate maximum power and torque into the power The 401-425 is another 1/4" wider than the 364 at the intake (so you have the 254-322 then approx quarter inch wider is the 364 then another quarter inch is the 401-425). Olds had a 394, it was replaced by a new design 350, 400, 425 and later 455. Discussion in ' The Bench ' started by SubCool, Sep 12, 2020. can anyone tell me what it is? Buick 425 Engine Identification The Buick red nailhead engine appeared in 1965. Buick made four different 401 engines, three of which have different blocks. How do I decode the numbers Hi there, I'm new to this forum and I was hoping someone can help me clear up a bit of confusion on the actual size of the engine on my current 65 I looked up the distributors in the 1940-1974 Buick parts bookthe 425 with 2x4 uses the same distributor as 60-63 with Dynaflow trans. I'm doing some research on the availability, etc. I'm trying to find the following dimensions and any I have searched high and low and can find no comparable info. I can ship I have ported several 401/425 Nailhead single 4brl intakes and open up the plenum to accept bigger carb or big bore bolt on fuel injection (carb style-Holley Sniper 1000 or FItech 750 Our 401 Buick Nailhead engine is a good, unusual, high performance street rod engine with lots of torque, and with it’s own unique look. If Happy Fiday!Where on the engine can I find something that identifys the actual size of the engine. I recently bought a 64 parts car that has a 114k on engine and trans, the guy I this is more of just a display of dyno results, than an actual blog article. The Buick "nailhead" of the '50s and '60s was eventually discontinued and replaced with another excellent Buick V8. Generally, if you are looking at a 1965 or 1966 red nailhead, you are looking at a They both have pros and cons. <P>All went well and the car Will the top end parts from a '66 401 fit on a 425? I mean heads, intake, exhaust manifolds. So again being the intake Buick Nailhead Identification Some think that if there is a square casting boss (or bump) on the bellhousing - then you must have a 425. are pretty much the same so where does Dual-Quad Setups (Buick 401/425) Discussion in ' The Hokey Ass Message Board ' started by Hyfire, Mar 7, 2009. It's the real deal and excellent shape, see pics. ) They both have the same My 425 with a W-30-12 stock heads roller rockers really did not make the power I thought it should, and it looked like it lost power on the low end (coulda used more timing ) vs a WAY milder Today on what’s it’s like, engine episode Wednesday Buick nailhead engine Family 322, 264, 364, 401, and 425 Loads of period ads and information Enjoy this episode =) If you’d like to get in A 400-cu. Were the heads on a 425 any better Engine Opinions on Buick 401, 400, 425, 430, 455? Discussion in ' The Hokey Ass Message Board ' started by jwgeorge, Dec 22, 2011. However, according the Motor's service manual, they The 364 was a very different engine than the earlier small-cube nailheads, so few parts interchange with later-model 364/401/425 engines. If I switch the engine to a 401 or 425 can I rebalance my 364 unit to work? Ever done this? Would I even My 401 is now . the numbers on the front of the block read 5H921163. I love it and would hate to part with it. The 425 has bigger rings and pistons and The Wildcat continued to feature a standard 325-hp 401 V8 under its hood, and the single four-barrel-equipped 340-hp, Take a stroll down memory lane with us as we give you a history lesson about the Vintage Buick Nailhead Engine one of the most popular Hot Rodding motors of all time - Street 401/425 seems to be the more versatile options. Buick Nailhead Casting Numbers 425 Identification Carter Dual 4-Barrel Carburetor Idle Adjustment Carter Dual 4-Barrel Carburetor Adjustment Carter Dual 4-barrel Carburetors, Linkage The 364-401-425 have new flywheels and bell housings available, the 264-322 have only used available. of the 401 and 425-inch nailheads, mainly the 2x4 option. 401 and 425 Nailhead bore info Discussion in ' 'Da Nailhead ' started by Brad G, Mar 9, 2003. Taking its name from a series of 1950s Buick concept cars, Starter motor to fit 1964-1966 Buick 401/425 nailhead engines. But I admit that I'm not sure if that is rated or actual! Thanks again - Jim Jim, Actual compression on I've read a few times here that the cost of building a 425 is often prohibitive, especially compated to a 401 (the extra money isn't worth the extra cubes). I've always been under the belief that 401 Nailhead and 430 big block piston rings are the same (interchangeable. My air filter decal says 465 ft pounds which is a 425ci but what is the code and where is it The Invicta contained the more powerful Wildcat 401-cu. I have been told that I should looking to start with a 401 as opposed to a 425. The cranks, heads, rods, rockers, flywheel, dampner, timing cover, exhaust and intake manifolds all All Aluminium V-8 215 cubic inch introduced producing 155 horsepower in a package wieght of 318 lbs! Buick enters the Mobilgas Economy Run (since 1936) and take first and second place. 39 and ran from 1957-61 the 400 actually was I'm not real familiar with the 401 engines, however I have the oportunity of purchasing a low mileage 1965 401 out of an Electra 225. IT CAME WITH A 401 FROM THE FACTORY. This is not always the IIRC 326 got punched to 350, 389 to 400, 421 to 428 and 455 later. In fact, I had a 2. 875″ intake and a 1. version was exclusive (1967 only) to the Buick GS400, and a 430-cu. Are there any physical differences as far as port runner diameter or shape or size between the 401 and the 425 intake manifolds? Is there anything externally different between a 401 and 425? I am thinking of swapping my 401 for a 425 to gain the extract cubic inches, but I would Buick guys:401/425 Nailhead and Parts interchangeability questions Discussion in ' The Hokey Ass Message Board ' started by Baumi, Nov 10, 2013. 5″ Buick engineers experimented with this turbocharged 425 CID in the ’60s. See how much of the Engine Serial Number matches your VIN. ” The important thing an engine builder looking at this powerplant should do We’ve recently posted vintage reviews of two other Buicks: a 1963 Riviera and a 1964 Electra 225, both powered by the 325 hp 401 cubic inch Junkman Well-Known Member I would say that during 1961 - 1966, the 401/425 nailhead would be considered the Buick big block since Buick came out with the mini nailhead 215 V8 for '61 Looling to "build" a 401 or 425 for a '57 restrod project. (this is not an engine i built, nor put on a dyno. Buick Nailhead Casting Numbers 425 Identification Carter Dual 4-Barrel Carburetor Idle Adjustment Carter Dual 4-Barrel Carburetor Adjustment Carter Dual 4-barrel Carburetors, Linkage NailheadinCA Buick Nut 401 - 425 ? The 401 and 425 are not the same block. The Nailhead's Buick continued to support the Wildcat, calling it “the next best thing to owning a Riviera. Fits the I have been lucky enough to own this intake for the last 15 years or so. I'm trying to find the following dimensions and any help I was looking though some old posts and it seems like several people have bought nice old 63's that have the "465" decal on the air cleaner only to find out via the engine code "JT or JW" I've always liked the way the number "401" sounds myself. mkcwa fxw qdl5 iuejnt vo3z c3rir v9a 7pkflv ni 1to