In this article, I’m walk to display you images of the fads you have to follow once torqueing details parts ~ above the most popular small Block Chevy (327 and also 350_ engines, 289, 302, and also 351 Ford engines, and also 318, 360, and 5.7-liter hem Mopar engines.
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SBC intake Torque – 327 & 350
SBC Exhaust Manifolds
When you’re installation headers on any type of SBC engine, these deserve to be a royal pain come torque, but they’re no less crucial than head or intake bolts. The pattern is easy: within out; or the facility bolts very first and then relocate forward and earlier from there. I favor to jump ago and forth-the two inside, the following outer two, and also then the outer two. Torqueing can be excellent in a single pass, v the spec being 20-25 lb-ft. I usually separation the difference to about 23. Also, if you installing stock manifolds, don’t forget to download the half-moon speak spreaders in ~ the front.
SBC Crank key Caps and also Rod Bolts
Main bearing hat on 327 engines should be torque in two measures to in between 60 and also 70 lb-ft, while 350 engines should be taken to 75. These space the caps on the crankshaft. Rod caps, or pole bearing caps, must be torqued come 45 lb-ft for the 327 engine and also 35 for the 350 engine.
Ford tiny Block Engines-the 289, 302, and the 351
Some variations of Ford’s 351 to be actually large block blocks with small block uppers and also some internals. These room usually pretty rare to find, so we’re only going come cover the tiny family the engines (289, 302, and also 351) that deserve to be found in the vast bulk of Ford strip burners out there and also being built. The target auto I’m using in mine lookup is a 1966 (289), 1968(302), and a1969 (351) Mustang. The photo above shows the torque sequence because that 289 input manifolds.
Intake Manifold talk Specs
Refer come the photo over on the bottom for 302 engine entry manifolds, if the photo below illustrates the 351 entry manifold talk sequence. As for the torque specifications, the 289 (above top) and also 302 intakes room both torqued in two stages to between 20 and22 lb-ft. The 351 intake, on the other hand is torqued in 3 stages to in between 23 and also 25 lb-ft.
Ford Head Bolt speak Sentences and Specs
The talk sequence for all three Ford engines have the right to be viewed in the picture above. Again, the 289 and 302 are two-stepped (I do three steps) to in between 65 and also 72 lb-ft. The 351 develops an ext compression and horsepower, so it needs much more torque on the head bolts. These room three-stepped to between 95 and 100 lb-ft.
Ford small Block Exhaust Manifolds.
Other than from the inside out, there space no speak specs I could find for any kind of of the Ford engine exhaust manifolds. Some of the Ford-heads I understand tell me the 20-25 lb-ft because that the 289 and also 302 engines, and 30-35 for the 351 is fine. They also mention the copper gaskets with high-temp exhaust spray gasket sealer need to be used.
Ford rod Bearing Caps and also Main Bearing Caps
If you’re putting together either a 289 or a 351, the rod bearing hat on this engines need to be torqued to in between 40 and 45 lb-ft. ~ above the other hand, you’re going to need to be cautious with the rod caps on the 302 engine as they room only claimed to it is in torqued to in between 19 and also 24 lb-ft. The main bearings top top the 351 engine space torqued to in between 95 and 105 lb-ft-you’re walking to need a good angle as well as a good grip on the speak wrench to hit the accurately. It should additionally be excellent in three steps. The other two engines aren’t together beefy, therefore they only get torqued to in between 60 and 70, v two steps.
Torque Specs and Bolt patterns for the Most famous Mopar Engines
Due come the lack of accessibility of true hem engines for all however those through deep pockets, until recently the engines of selection for hot rod restorations and go fast projects for Mopar enthusiasts have been the 318 and the 360, both of which are based ~ above the very same block. In ~ the past pair decades, Mopar has made newer Hemi engines more affordable and also thus more achievable for the rest of us.
Mopar entry Manifold Bolt Patterns and Torque Specs
When she rebuilding a 318 or 360 Mopar engine, you require to have a torque wrench that have the right to do both light and also heavy torque settings. When torqueing the intake manifold on these engines, you should two-step the torque, complying with the bolt sample in the picture above, come a best of 35 lb-ft. If she rebuilding a 5.7-liter hem (Below), this is reduced to a single pass at nine lb-ft the torque.
Head Bolts ~ above Mopar Engines
Mopar engines the old were favorites of traction racers for years because they create gobs the low finish torque versus your competitors. This way their head bolts must torqued much more than others. Complying with the bolt pattern in the picture above, you must three-step her head bolts to a final torque that 105 lb-ft through 318 and also 360 engines.
Hemi engines are rather different. Mopar still states a three-step torqueing process, but they point out what speak to use at each step, plus they break it down by what head bolts are used. The first step because that M12 head bolts is come 25 lb-ft, v the second step gift to 40. After ~ that, revolve the bolt another 90 degrees (1/4 turn). V M8 head bolts, the an initial to procedures are 15 and also 25, respectively, with the final step also being a full 90 degrees.
Mopar Engine rod Bolts
When rebuilding the 316 engine pole bolt-rod bearing lid torque have to be set to in between 45 and also 50 lb-ft., This differs from 360 rod bolts the max the end at 45. These should be excellent in two steps, law both bolts/nuts to about 20 lb-ft an initial and then doing both to the last torque. Hem engines (the 5.7 liter in ~ least) go to 21 lb-ft and also then acquire a final twist that the bolt a full 90 degrees.
Crankshaft main Bearing cap on Mopar Engines
This is an additional instance wherein the 318 and also 360 engines room torqued pretty strong while the hemi engines are very easy to over-torque. Key bearing cap on 318 engines must be torqued to in between 85 and also 90 lb-ft., when 360 engines need to be torqued come 85.
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The books additionally specify two different types (strengths) of main bearing lid bolts. They likewise specify a two-step speak procedure again, as well as a certain pattern to use (Image above). M12 bolts space to torqued to 20 lb-ft and then turn a full 90 degrees for last torque. Before the last 90 level torqueing turn, M8 bolts are torqued come 20 lb-ft.