lowet50

I am toying with the idea of buying a stroker kit. Before I buy anything i was wondering if the stock block can handle a 331 or will it crack on the drag strip?

Mishri

this is the section for the coyote DOHC 4 valve 5.0... you'll want to pose the question in the other section if you haven't haven't already, I don't know much about the old 5.0.

reldla1996

Stock 5.0 blocks vary considerably, but 400 hp is roughly seen as the limit for 86-93 blocks (80-85 blocks were weaker) for long life. A mild 331 would probably be okay, a mediocre would be on the bubble, and a racy one would last for a while, but hard to say how long. Main studs and a main girdle is one way to add some strength to the stock block, and many stroked engines add these for increased durability.

lowet50

Thanks for the info, and sorry for posting in the wrong place...still a little new at this

mjr46

80-85 blocks are no weaker than 86-95, early 70's are the tad stronger ones due to thicker main webbing and blind holes in the main studs and 400 hp the limit really?? not even, more like upper 400's, got plenty examples, including my own to dispute that.

tinman

I use a '69 302 block that overbored .060 with a 3.400 stroke. I also use a solid roller cam and make about 530 flywheel HP based on the cars 1/4 mile MPH.
It's all motor and a carb, no 'power adder'.

mattdel

Its fairly common knowledge amongst 5.0 builders that the stock fox blocks tend to give out somewhere in the 5-600hp range. We have at least 1 member here who split his block right down the middle of the lifter valley with a stroker/forced induction combo, I believe. At any rate, you'll need to be under the 12sec range at minimum to worry about breaking the block.

tinman

Some other factors to consider when building a stroker motor are the balanacing, some stroker kit sellers will want to balance the kits they sell for you. This is a fine idea if you are buying the flexplate/flywheel as well as the harmonic balancer from them, otherwise, getit done locally.
You will also need some aftermarket heads as there are no heads made by Ford that will do the job right and don't even think trying to cheap out by porting any production. Those heads will never keep up.
Stroker motors are not for everyone and they are not 'cheap and easy'.....

UPRSharad

I made 525rwhp with a stock 5.0 HO block.

There's an article in this month's MM&FF where Richard Holdener makes 400 crank HP N/A and 600 boosted with a stock block 331.

lowet50

Thanks everyone for the help, @ Mishri I tried to repost and was denied...will post in the correct place with my next question.