mid 70 302?

[CrimsonGT]

i just aquired a used 302 out of a mid 70 modle granada, my question is, is the mid 70 modle block stronger than the 86 5.0 block I have, and would it be better for my street/strip 347 stocker motor. The motor looks to be in good shape and got regular oil changes. I not sure if the bore is oversized yet.

[1Quik85GT]

yes its stronger, its made out of a different matieral than the HO blocks or 80 model blks. Use it

[1Quik85GT]

Besides the boss 302 blk, out of all production type 5.0 blocks I would use the one you have

[QWKSNKE]

Besides the boss 302 blk, out of all production type 5.0 blocks I would use the one you have


interesting. I was told the opposite earlier this year.

Either way, if you are planning to use a roller cam like the late models, you will be spending around $500 to make one work

[CrimsonGT]

thanks guys for thr quick response thats what i was thinking just wanted to double check

[1Quik85GT]

the early model 302s like late 60s and early 70s are stronger than the 90models or 80s. I would rate the Boss 302, then mex,302, then the early model 302s as the good prod. type blks

[Craig K.]

As Lee pointed out, if you are planning on running a hydralic roller cam you'll need to do a retro-fit to that block, or use cross bar style lifters.

[CrimsonGT]

i plan on hydraulic roller. I will pay the money for the conversion kit.
I just want to use the block that strongger so I can turn it more.

[coupe]

You're better off keeping the stock roller block and using your $500 for a good balance job etc... and still be able to make 400-500 hp. The old block you have is only marginally stronger and not worth the conversion. I know some guys turbo'ing the heck out of 347 stock-block motors. One just went 10.3's @ 134.

[1Quik85GT]

You're better off keeping the stock roller block and using your $500 for a good balance job etc... and still be able to make 400-500 hp. The old block you have is only marginally stronger and not worth the conversion. I know some guys turbo'ing the heck out of 347 stock-block motors. One just went 10.3's @ 134.


it will not last long, I would do it right the first time. You will be pissin all that away when it blows.

[Shankin]

The earlier is stronger but unless you plan on making over 550 to the tires i would use the roller block. The other block will require a retrofit cam or lifters to use a roller set up. This can get costly.

[Dale McPeters]

Best solution on 302 roller based setups that will be making lots of power..........

After market block such as the Dart 8.2 Block................. :yup:

I now have seen first hand what happens to the stock 5.0 roller blocks when used in high performance applications. They do not last if you make good power with them......

Note this is just MHO....YMMV.

[coupe]

:werd: x2

To do it right you should really go Dart, R-302, or similar, but they take a big investment financially...trust me.

The 289/302 engine from the factory was a "thin-walled casting" and included the 60's thru the 90's (except those made in Mexico). It kept the weight low. There are some minor differences, but they are all limited to aboout 550-600 at the wheels and even then, they're a time-bomb. For 400-450 rwhp, you'll only be wasting money on the retro-roller stuff...so keep the roller and put a 347 in it. :nice:

[Dale McPeters]

:werd: x2
To do it right you should really go Dart, R-302, or similar, but they take a big investment financially...trust me.


Yep a lot of cubic cash......;)

Well unless your name is Lee H. and you
talk the distributor into getting you one
for almost nothing!!!! :D

[CrimsonGT]

i'll just put the 70s block on my wood chipper and build the 5.0 block, i'm gunning for around 450 hp flywheel