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by **Richie O** » Thu Dec 10, 2009 6:10 pm

I still have a few "010" 350 4 bolts kicking around. Not completely over the smallblock's yet.

And yes the 302's were pretty rare. I do have 1 question though. If the 302 is just a 350 block ( which it is ) with a 283 stroke then it is not a 283 crank just put in a 4 inch bore. The 283's had the small journal crank and the 350's had the big journals. So it must be a large journal crank made special for the bigger set up. I have seen aftermarket rotating ass. to make a 302 out of a 350. ( destroke kit ). I still would like to make a 377 some day.

by **Richie O** » Thu Dec 10, 2009 6:15 pm

One more thought on a gasket being inside the bore. I have a set of 58 cc hp heads and always had spark knock issues with them. I wondered if it was due to the head being made for the smaller bore 305 ( which is where the 58's came from ). I think there was a small edge of the chamber that may have been causing a pre ignition detonation some times. I blew several pistons with that set up.

by **1STGENFARMBOY** » Thu Dec 10, 2009 9:41 pm

He don't have an original DZ 302 mprmn08, we are talkin about buildin one out of parts that are not quite so rare,and yes if you hade one out of a 68,69 camaro Z28 you would have a chunk of gold. :shock:

they are easy to spot with DZ stamped on the deck pad, of course these can be forged. :roll:

Richie I may have misspoke i think it's just a 327 block with 265 or 283 crank and rods :roll:

by **Richie O** » Fri Dec 11, 2009 10:31 am

Yup, I think 327's came in both small journal ( early ) and big journal ( late ).

by **mprmn08** » Fri Dec 11, 2009 5:16 pm

Richie O wrote:One more thought on a gasket being inside the bore. I have a set of 58 cc hp heads and always had spark knock issues with them. I wondered if it was due to the head being made for the smaller bore 305 ( which is where the 58's came from ). I think there was a small edge of the chamber that may have been causing a pre ignition detonation some times. I blew several pistons with that set up.

where you possibly to high compression for a regular and need premium?? :shock:

good possibility on the spark knock

by **Richie O** » Fri Dec 11, 2009 7:49 pm

mprmn08 wrote:
where you possibly to high compression for a regular and need premium?? good possibility on the spark knock

Even 91 sucked. Just a poor set up. The 58's did increase comp ratio up some.

by **ahale2772** » Fri Dec 11, 2009 9:29 pm

mprmn08, i only thought the felpro 1004 was for a 400 sbc because i looked it up on summit and it said something like 4.125 bore...

Head Gasket, Composition Type, 4.190 in. Bore, .041 in. Compressed Thickness, Chevy, Small Block, Each

I believe 4.125bore x 3.75stroke is a 400 smallblock

.thats all i know about that particular gasket, ive read that if u put headgasket that is too far away from the cylinder wall when u set it on the dowels than it will leave x amount of space from where the cylinder wall ends to the gasket...that space once the heads are on will create a dead spot that messes up flow....yadda yadda yadda...kind of hard to write on a forum i cant even understand what i just wrote ...and yeah richie o ive heard that when u put a smaller size on it can become an area that leads to detonation....yeah the block is a small journal 327 and im running a forged lighweight crank with tiny tiny hbeam rods arp everything...going to make it kind of retro so when i open the hood it just looks like another old sbc...then i blow their doors off

by **ahale2772** » Fri Dec 11, 2009 9:37 pm

and that little tidbit about the main web thickness is very interesting, I hope my crank can keep up

by **Richie O** » Fri Dec 11, 2009 9:44 pm

When I was a kid in school my buddy next door had a 68 chevy truck that we put a 283 in. We put a huge cam that had no right being in a lil 283 ( somewhere around a 290 duration and 500 lift ) It would not even idle under 1100 rpms. :lol:

Anyways we were in front of school with it being cool

and this classmate comes up and says " that thing runs like sh!t " My buddy burried the 8,000 rpm tach in park. The guy was blown away. It was funny. The thing had 0 power under 6 grand.

by **ahale2772** » Fri Dec 11, 2009 9:52 pm

thats what i had in the car before this motor, i put a 30/30 duntov with 202 fulies heads it ran great.....for 2 hours... then i learned a valuable lesson that cheep napa oil dosent have zinc in it and that is KEY for breaking in a cam pulled that 283 out and now its pickled, someday that will meet a 4 inch bore and become a 302 as well, but before i touched that 283 it ran for a year flawlessly, i could rev it till 8 grand and it loved it, each time i did it poured oil out of the rear intake manifold gasket and covered the headers, simultanieously rust proofing the car and acting as a smoke screen from the local police :lol:

she needed a rebuild bad :oops:

by **ahale2772** » Fri Dec 11, 2009 9:54 pm

...then i bought a dodge and that acts as my smoke screen

by **1STGENFARMBOY** » Fri Dec 11, 2009 10:13 pm

As far as it lookin like a stock motor i ground off the wiend off my intake put old valve covers that had the chevrolet script on them painted the thing orange, it did have doug thorley headers and a mallory duel point marine aplication, and i took apart an original oilbath aircleaner and put a filter in it, it looked stock to most kids,and my motor would hit about 7,800rpm with a hydrolic crane 310 duration 530 lift :shock:

,if it would have been an auto the stall would have been a 5,500 to launch, :roll:

by **mprmn08** » Sat Dec 12, 2009 9:01 am

i've never heard about the dead spot but like i said we use this gasket on all our small block engines we do (unless we put on MLS of course) and they work fine. so i guess take what you want from it.

by **ahale2772** » Sat Dec 12, 2009 2:54 pm

im olny looking at the fact that my bore is 4 inch and that headgasket is for a 4.19 ... no hard feelings but thats almost a quarter of an inch bigger thats all, ive never seen on used one so what do i know

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