70 gmc

[70stroker]

Ya this is gonna put me at 8.9 to 1 to 9.1 to 1 CR depending on which head gasket i order, still up in the air on that. Im excited to see it run again, i dont know how people do these 4 to 5 year builds, I need to sit in the driver seat and drive. thats why i did my paint last summer than tore it apart for the motor over the winter. The way its shaping up i hope to be stabbing the motor over my spring break from school which will be mid march.

Thanks for the comments guys, it keeps me pluggin away,

Originally Posted by highperf4x4

mm mm mmmmm, polished and chamfered! Looks sweet!

So you're running a flat top piston? Is that because you're throwing more boost at it?

[72lb4x4]

Whoa! My hat's off.
I'd be afraid to put a a motor together.

[highperf4x4]

That freakin tranny pan looks huge.

I thought you already had some cool guages in a custom dash?

[70stroker]

highperf i just had a 5inch autometer tach. Got my valve covers in today also. Now parts are stackin up.

[Slick67]

I love the parts collecting, it's almost as fun as driving the finished product. You have a great stash of parts!! Keep going!!!

[highperf4x4]

Man, it seems like just yesterday you were hanging plastic in the garage and everything looked orange......................

and I was drooling over some vette

[VA72C10]

wowsers...thicker head gasket maybe?

[highperf4x4]

It looks to me like you're going to have to check piston to head clearance! It looks like it is sticking out of the friggin block.

[70stroker]

You guys got me even more worried, not honestly tho i put a machinist straight edge across it and its level not above the deck. the pics do make it seem that way.

[highperf4x4]

Whew! I think you were messing with us!

[highperf4x4]

Awesome! I get the impression you're serious about this truck thing.

[70stroker]

Arnt we all a little to serious....lol

[highperf4x4]

[barthmonster]

Part of proper engine set-up (I'm a little rusty), is the space between the piston top and the flat part of the combustion chamber. They call it the quench area. If it's just right (something like .045" to .070") then the piston comes up and swooshes the exhaust gasses out of that area fast and the gas-velocity cools the head down preventing detonation. Just something to be careful of, I don't know of any head-gaskets that thick is all...

I just figured this was the time to ask, vice later...

[70stroker]

thanks for the specs. once i get the bottom end done im gonna put the heads and and adjust valves and turn it over a few times and check how close everything is. what is that playdoo looking stuff you use for that?

[barthmonster]

I think modeling clay. But that is a different spec. With that you're measuring piston to valve clearance with the cam installed and hooked up.

The piston to head (flat part of the chamber) is what I was worried about with that piston setting so high...

Keith Black says .040" is okay, with .035" minimum. You'll need a thick gasket I'm thinking...

http://www.kb-silvolite.com/test/art...n=read&A_id=35

[70stroker]

ya im going out in the shop in a bit to put the other 4 pistons and rods in.

ill measure it with a mic to see how much its sticking out. Im pretty sure the gasket i bought isnt going to work its compressed thickness it .041 so there is no chance. I found this copper one with .072 so i think it might work depending on the measurements i get later today.



http://www.summitracing.com/parts/SCE-013387/

I have always been recommened to run MLS gaskets with a blower, Any idea on how copper would hold up?

[highperf4x4]

.041 compressed should be thick enough

[70stroker]

Got the firewall pretty much done this weekend along with my gauges.

[VA72C10]

Looks good!!!

[highperf4x4]

Cool. What are you going to put in the center hole on the cluster?

[70stroker]

I have a line on a 3 3/8 fuel pressure gauge... we will see if that works out

[70stroker]

wow had to dig this off of the 5th page.... thats not good.

anyway heres a few pics.





You can see here the headers were rubbing the frame just a little bit i had to trim the frame maybe a 1/4 inch.









Heres the main reason i spent the kind of money i did on the headers. No more ground clearence problems.. SWEET

[highperf4x4]

That is awesome! I wish had your bank account!

[70stroker]

Maybe a few months ago you would of wished that, Not after i bought all these parts. But you would have some cool parts layin in your garage.

Originally Posted by highperf4x4

That is awesome! I wish had your bank account!