mopar compression test b block 400|compression test : China A 400 is a relatively big bore and short stroke engine. It's got decent heads for the size, and there is no special "hi perf" castings to look for. The main problem is the low factory . We would like to show you a description here but the site won’t allow us.
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I am going to do a compression test on my 440 tomorrow. A couple of questions.. Should ALL spark plugs be removed prior to testing? Is it necessary to shut off . Here is a 7.5:1 compression 400 that if we would have tested with a 4-bbl dual plane manifold like the Performer RPM would have really been impressive. Save the .
In this application, the 400 had a four-barrel carburetor, had the same 8.2:1 compression, and was rated at 195 horsepower and 305 pound .
A 400 is a relatively big bore and short stroke engine. It's got decent heads for the size, and there is no special "hi perf" castings to look for. The main problem is the low factory . Mopar lists the 400 as having a compression ratio, leaving the factory, at around 8.2:1 with just about all of the open chamber heads. The combustion chamber sizes are around 78cc with 2.08/1.74 valves. Just finished testing compression this afternoon, results below are cold & dry. From everything I red the numbers seem higher than what I would've expected for a healthy .
I have a 400 (actually 406) that I don't need anymore. The block is 4.375 and it has a forged 383 crank in it. This was a running engine with high compression pistons that ran high 10's in a street car. I'm going to switch . With a relatively low 8.2:1 compression ratio, the final 400 V8 version produced a mere 195 horsepower and 305 lb-ft of torque.
Find CHRYSLER 6.6L/400 Mopar big block B Pistons and get Free Shipping on Orders Over 9 at Summit Racing! The 400 B does not have a long stroke- it's VERY oversquare at 4.34" bore x 3.38 stroke. This is less than a 267/305/350 SBC. Even w/the 440 stroke length crank, it's then the same stroke as a 383/400 SBC @ 3.75", except the displacement jumps to ~450 cid- w/the 3.75" stroke and a 0.060" over 440 piston, or what ever it is MOPAR guys use these days.
Shown above is the #2 saddle on a late model (76-78) 400 block, casting #4006530-400. The "B" measurement remains the same as the early 400 block at about .525 -.575, while the "A" goes down to roughly 3.300, making the . Building a 383 big-block for some dyno thrashing doesn't have to be hard. . will provide a compression ratio of just over 10:1. . 10 Big-block Mopar engines have one of the best oiling systems . Just finished testing compression this afternoon, results below are cold & dry. From everything I red the numbers seem higher than what I would've expected for a healthy engine. It's a 500ci 440 stroker with approx. 10.5-1 compression and a small hydraulic cam. Are the higher numbers a result of. even with those eddy heads,you will still only be about 8.5-8.9 to 1 compression. the pistons on that 400 are anywhere from .090 to .115 below the deck. which is not a bad thing necessarily. hughes engines have developed a new line of whiplash cams that are designed to not bleed off so much cylinder pressure, and make great power in lower compression .
I have a 400 (actually 406) that I don't need anymore. The block is 4.375 and it has a forged 383 crank in it. This was a running engine with high compression pistons that ran high 10's in a street car. I'm going to switch over to a 470 engine with pump gas compression so I don't need the crank or the block anymore. Classic Mopar Tech. Engine, Trans & Driveline . 1968 383 Compression Test & Restart . on a set up like your's. A support fixture should be made, that bolts to the rear of the block (in place of the trans), with a linement coupler for the converter's rear shaft, at least for support. . I'd say do a good compression test, see where it's .
Yes the 72 230 block would be the one to have. But I have a 73 no # block and I beleave with a girdle it will be fine.I got the block with a car I bought, the car has a .055 over 440 motor with a motor home block in it now.Just getting ideas if I build another engine maybe building from 400 block.I have Indy 440-1 heads and I beleave they can handle 540 ci. How to transform an RB-series Mopar 440ci block into a 512ci monster. . (B series) 400 blocks to get 496 cubes. . big-blockbased stroker kits that'll deliver up to 543 reliable cubic inches .
compression test
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Timing depends on the combination and low compression engines like a lot of timing. The cam also plays a big part in the equation. So far over the years, I've tuned two engines that liked 50 total and both had low static compression and fairly long cams. I am doing a low cost father son 400 build (strokers are out) and I am looking for a piston recommendation. The block is a standard bore 400, a 383 forged crank, 452 heads and 440 Source factory style connection rods. The car (72 Satellite) is a street car, 3.55 gears and a 727 with 2400-2600 stall. I am looking for 10:1 compression. I have relatively mild street 400/500 stroker motor. Here are some of the details: Rear wheel hp 360 Rear wheel torque 390 MSD 6AL box, MSD distributor and wires Aluminum Procomp heads 10-1 compression 91 octane gas NGK 7 plugs Smaller roller comp cam I pulled the plugs and they were very black and even had some burnt carbon crunchies on them. I . He is looking for a nice boost in low to mid range torque, and would like a nice idle lope that isn't really choppy. 440 I think motorhome compression is 8.6:1 Factory intake Thermoquad Factory exhaust manifolds Dual 2.25" exhaust 727 auto, stock covertor with shift kit. 3.23 gears 67 Sattelite Looking for recommendations for hydraulic flat .
The Last Mopar Big Block Engine: The 400 V8
The 383 became the standard model Mopar performance engine for the next decade. . at 4,800 rpm and 410 lb⋅ft (556 N⋅m) of torque at 3,200 rpm. All three versions used the same 8.2:1 compression ratio. The 400 was used in car, . done a compression test on my car today, a 440ci unknown history, runs nice,no burning oil/losing water,want to eventually change heads to ali as 906s and have difference of over a bar between first two cylinders .whats the chances of my heads being poor valve clearance or bores worn etc. car never really inspired me power wise,bit of a dialema.options i guess are . We decided to follow along as MRL Performance builds a stout big-block engine for a pulling truck, and see what it takes to make more than 700 horsepower and 625 lb-ft of torque from a cast-iron .
Classic Mopar Tech. 1966 -1967 Mopars . Need help!- Low comp 440 cam choice. . I used a whiplash in a low compression 400. It made ok power but idle quality sucked and didn't make enough vacuum for power brakes. . Similar threads. W. Big block hydraulic roller cam/lifter choices. What’s up dock; Oct 12, 2024; Engine, Trans & Driveline .
Small Block Mopar Engine . 71 340 Compression Test . compression test on the engine with all plugs removed. Range was between 150-164 lbs which is about 8.5% difference. . Makes the heads easily support 400 HP. As for compression. Dynamic compression matters much more than static compression. With iron heads, max on pump . The actual amount of compression is relatively unimportant in a street car. You should be looking for all cylinders to be within 25-35lbs of each other. If one cylinder is 75lbs and the others are 150lbs, then you have a problem. I remember a compression test on a '64 Galaxie 427 side-oiler, compression was 100lbs all cylinders. It ran smooth .
Pushing redline in a small block Mopar is a feeling unlike that which any B or RB engine can provide. . This is “so far” our high water mark for small block MOPARS. As you can see by the Dyno test results it was 701.6 HP @6800 and 585.9 TQ. @5100 RPM. . Diamond custom forged “High” compression & Diamond pins. Rings: Custom low . Kept the compression down to use pump gas and believe it or not, it’s very street worthy. . That's why Mopar came out with the 400 "big bore" B engine block. . Local time 4:43 PM Joined Jun 30, 2020 Messages 1,535 Reaction score 1,311 Location Chicagoland. Maybe a missing link, a 400 block is a different casting then a 383 even though . 360ci Compression testcard - Cold engine. Did a compression test today on the 360. The engine was stone cold, removed the plugs and checked all the cylinders one by one. I did a second test with the carb wired fully open which I forgot on the first test. Wanted to do a ‘warm’ engine test as well but was a little pressed for time.
The old 451" 400 stroker has the B1-B/S heads with stage 1 porting from Koffels place (I think they flowed in the 290's cfm?) They worked very good with the 251/251 @ 0.050" 0.620" lift solid roller cam and M1 Intake. The 499" 400 stroker has the Hughes Engines CNC ported Max Wedge Victor heads that flow 400 cfm.
I put one in a 77 .030 over 440, basically a stock rebuild otherwise. 452 heads, stock springs and rockers, performer intake and 750 Edlebrock carb.. Has a wicked sound. Haven't put it to the test yet but the "round the block" rides are impressive for the low compression engine. Lots of torque! Hi all, What are good compression test numbers for a 1973 motor home block 440? Also, what would be considered bad numbers? I would like a rough range to. Link To eBay Motors. Home. . I was showing 190 when I had almost 11.0 compression and a Mopar 509 cam. The motorhome, truck and van engines were often in the 7.5 to 8.0 compression range. . It is easy to get horsepower out of a big block Mopar. Do a basic build on the bottom, get your compression around 10:1 and spend some money on heads. Get the heads to flow and you got it. Put a roller cam in - adjustable rockers - get the right stall and gears to make it .
The 400 V8: Final Mopar Big Block Engine
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mopar compression test b block 400|compression test