Thread: chev 302's back from the dead

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kinda just like they went from a 396 to a 402

This is true but they used a new L/J block with a cast crank . The 283 blocks had the rear breather port and front oil fill port .

You can make a S/J 307 engine out of a 283 block with a S/J 3.25 327 Crank and a set of 307 pistons .

Originally Posted by speedy55779

true i over looked that but why would you want to? it would be like putting a 350 crank in a 283 block for example.

Many performance engines have gone to smaller dia. rod and main sizes.
An example would be a 434 SBC in a Dart block that has a 350 main size along with a small 1.888 Honda rod journal size.

Originally Posted by tango

You can make a S/J 307 engine out of a 283 block with a S/J 3.25 327 Crank and a set of 307 pistons .

Very true you make a 307 but i'd rather go for putting a 283 small journal crank into a 327 small journal block to make a 302cid. like what they had in the 67 camaros.

I always liked the larger bore idea more then the stroke to CI one . This is the reason I will not build a 305 for a street / strip set up with its 3.736 bore . But The 305 can be a great street engine and give good MPG .

Originally Posted by erik erikson

Many performance engines have gone to smaller dia. rod and main sizes.
An example would be a 434 SBC in a Dart block that has a 350 main size along with a small 1.888 Honda rod journal size.

434sbc 1.888 honda rod journals japan and american shouldn't mix i can see them offset grinding the rod journals to achieve a longer stroke but what kind of crank are they running?

Originally Posted by tango

I always liked the larger bore idea more then the stroke to CI one . This is the reason I will not build a 305 for a street / strip set up with its 3.736 bore . But The 305 can be a great street engine and give good MPG .

i've thought about tinkering with a 283 or 307 for stock car racing to run higher rpms but you can only run a chev 305 olds 307 mopar 318 and a ford 302 all stock and non roller motors or H.O.(high output), but can run a cam with no higher than a 420 lift the most popular cars are 80's montecarlo's with 305's around here once in a while you see someone running an olds 307

That Mopar 318 is a good runner . I do think I could build a 318 to out power a Chevy 305 .

I built a 320 cu small block Chev using a 283 SJ crank in
a 327 SJ block bored to 4.125 . I did this for a oval track
class that used a cubic inches to weight rule. I would turn
it to 8,000 RPM most of the time . The block was from a C50
truck .
Dave

Originally Posted by speedy55779

434sbc 1.888 honda rod journals japan and american shouldn't mix i can see them offset grinding the rod journals to achieve a longer stroke but what kind of crank are they running?

It is a Callies crank.
The rods are Oliver 6.0's.

Originally Posted by hawk56

I built a 320 cu small block Chev using a 283 SJ crank in
a 327 SJ block bored to 4.125 . I did this for a oval track
class that used a cubic inches to weight rule. I would turn
it to 8,000 RPM most of the time . The block was from a C50
truck .
Dave

I see how you made this 320 engine . And it is a COOL build . With a 400 SB Standard bore of 4.126 . The cylinder bore must have been real thin ?

Tango
Yes the walls were thin, the first block did not make it, hit water.
That is why I mentioned the truck block, thicker walls ? or just plain luck ?
Dave

I do like this build . but with a 400 block . I have built 406 SB Engines They make lot's of power . But they also run hot with that steam hole set up . I really never liked the 383 builds . So I will try another 400 30-over 406 with a good water pump and large radiator . COOL I Hope

Tango
You are right the 400 would have been much easier ,but I built this back in about 1968 , before the 400's were common . I specal ordered the pistons
before boring the block, so it had to work even if I had to sleeve the block.
The weight savings on the car by going to 320 CI from 327 CI was 100 lbs
for oval racing this was a big avantage. Also a steel 39 lb crank and aluminum
rods. Yes it did run hot , but oval racers never look at guages anyway
.LOL
DAve