notching a block for a 347

Rusty67 said:

Do the 5.0s need to be notched as well ? They have a taller deck height from what I understand.

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There is no difference in deck height between a 289, an early model 302 or a late model 5.0.

There is a difference in deck height between these engines and a 351, both Cleveland and Windsor.

There are deck height differences between a Cleveland and a Windsor

There are even deck height differences between different years of Windsor blocks, with the early ones at 9.48" and the later ones at 9.503", but there are no differences at all in the deck heights of the 289/302/5.0L

There are differences in the length of the cylinders between a 289 and a 302--I can't remember which is which, but one of them has longer cylinders (I think it's the 302, mainly because it's got a longer stroke, but just can't remember).

The earlier blocks were thicker, with the Mexican blocks and the 289 HiPo blocks rumored to have the most "meat" in them

In (I believe) 1979, the 302 blocks became thinner, and were re-designated "5.0L"; they started using hollow crankshafts that required a heavier 50-oz imbalance instead of the previously used 28-oz imbalance.

I believe in 1983 or 1984, they started using roller hydraulic camshafts, which required the lifter bores to be longer or taller, depending on how you want to look at it.

I'm not sure when they started using one-piece rear main seals, but I think it might have been around that time as well.

Rusty67 said:

Do the 5.0s need to be notched as well ? They have a taller deck height from what I understand.

Click to expand...

Yes, I did a 347 with a brand new 5.0 block and it required notching. Same with my R302 block. Its really not that big of a deal though.

I will need to see some evidence that a 289 block does not need a one piece rear main conversion, to make a better stroker candidate.....

While it may be a "stronger" block than a ~74~ on up, it is still prone to leaking....

I offered my bit of information more from reading HP books, rather than 'internet only' research.

I don't want to sound bitchy about it, but I would like to see something else cited.....