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The roller [i]block[i] has taller lifter bores, no boss on the d-side for a clutch z-bar mount, and is machined for a one-piece rear main seal. Also, I believe some of the earlier 289/302 blocks had a higher nickel content, making them slightly stronger, but I'm not sure on that one.
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Tad H.
'67 Fastback
331 stroker
I've been told before that older 289/302 blocks will not support roller lifters as well as a 5.0 will, is this just another myth?
Those tall lifter bores I was talking about keep the lifters from being popped out of the bores at the top of travel. You can convert non-roller blocks to a roller cam, but it requires the use of a reduced-base-circle cam to keep the lifters in the bores. Many kits also require that you drill and tap the lifter valley for the spider assembly.
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Tad H.
'67 Fastback
331 stroker
you can also use link bar lifters to convert non roller blocks to hyd roller so you can use any 5.0 off the shelf std base cicle cam. If I was starting from scratch I would use a roller 5.0 instead of a 289 o 302 for sure, unless you are pushing more than 450-500 hp o turning super high rpm its not an issue.
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67 vert, 408 stroker 205cc TW heads, CI cust hyd roller,Dougs 1 3/4 try y's, global west neg roll,lentech aod...etc etc etc
No, you can't use a standard roller 5.0 cam in a non-roller block. Period. Roller lifters are taller because of the roller assembly at the bottom of the lifter. A standard base circle cam will push the cylindrical part of the roller lifter out of the bore.
You can use link-bar lifters to eliminate the need for a spider assembly, but not the need for a reduced base circle cam.
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Tad H.
'67 Fastback
331 stroker
Yes, they do. They just don't need a spider assembly. The link bars just keep the lifters from rotating in the bores, which is normally what the spider assembly does. They don't make the lifters any shorter; you still need the roller assembly on the bottom.
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Tad H.
'67 Fastback
331 stroker
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5.0 vs 289/302
