[F-BIRD'88]

You cn do it all yourself.
Here is a free download compression ratio calc.
Download Free Compression Ratio Calculator, Compression Ratio Calculator 1.0 Download

You need to know the cylinder head cc and the piston to deck clearance @ TDC

Generally (based on a 0 deck height) 383 with a 64cc head wants a -12cc dish

a 70-72cc head can use a 383 flat top piston.

[ChevroletSS]

Thats the thing I dont know my piston to deck clearence. The block is still at the shop and I dont know how much of the surface he took off. The block was in awsome shape. Is there a usuall ammount that machine shops usaually take off the deck surface. The block has never been worked on previously. I suppose I can still run my CR between 9.5:1 and 11:1 and get a piston that will have my ratio somewhere between that mark without knowing off hand the piston to deck clearence is. So would I be able to get a +12 cc or + 5 cc dished piston to make my CR between that mark without knowing right now what my piston to deck clearence is.

[vinniekq2]

you can test assemble the crank and pistons,check piston to wall,check deck height,check piston to valve with cam in at least 3 positions,then send block back for second machine work,maybe include pistons for valve relief,all before anything is balanced

[ChevroletSS]

well I need to order my rotating assembly before I can do all that. I dont know the piston to deck clearence But need to know if the +12 cc or + 5 cc, or a +7 cc dished pistons will give me a CR between 9.5:1 and 11:1 without knowing that off hand. Im sure I can get my compression in between that mark with one of these three pistons.

Thanks guys for the input Im new to the PERFORMANCE side of engine building so bare with me please.

[vinniekq2]

did you read Fb88s post?

[cdminter59]

Unless you tell the machinist to mill the deck he won't if he don't have the crank, rod, and pistons. The kits listed tell you the compression ratio with the cc of the head chamber. There is no such animal as a 10.0 compression piston. You get the piston head volume from the manufacturers website and enter it in the C.R. calculator. Also the head chamber cc, gasket compressed thickness, gasket diameter, cylinder bore diameter, deck clearance, stroke, and rod length. It takes all of these measurements to figure static compression ratio. For an example if you have 64cc heads, 12cc piston head volume, .040 compressed gasket thickness, 4.166 gasket diameter, 4.030 cylinder bore, 0 deck clearance, 3.75 stroke and 6.0 rod length = 10.232 C.R. If you have .025 deck clearance, .015 gasket thickness, and a 12cc piston with everything else the same = 10.272 C.R. Just change pistons to a 18cc piston, 0 deck clearance and .040 compressed gasket thickness = 9.623 C.R. Change the deck clearance to .025 and a .015 compressed gasket thickness = 9.658 C.R. I used 0 deck clearance and .040 compressed gasket thickness to have a .040 quench. Same for .025 and .015 = .040 quench.

[ChevroletSS]

Well guys finally got my crank rods and pistons. Almost to the building process. I feel like a kid on christmas morning.

[vinniekq2]

Is that a cast crank?
roll around with the parts,get to know them and love them,lol.

[Choctaw Bob]

Fun, isn't it?
mine is just a few months ahead of you. I will start mine and drive it in a couple of weeks, God willing. I've had to stop again on account of the weather. Another few weeks and Spring will be here!

[ChevroletSS]

it's a steel crank. figured might as well get a descent one if I'm gonna be runnin around 500 horses and up to about 6500 rpm. went with eagle 5.7 rods and hyper pistons. it does make me want to tell the ole lady she has to sleep on the couch. lol should be gettin my block back this Friday so just need to order some ARP bolts real quick so I can get started when it comes. any one know any good paint for blocks. not the spray kind. brush on

[Choctaw Bob]

Originally Posted by ChevroletSS

it's a steel crank. figured might as well get a descent one if I'm gonna be runnin around 500 horses and up to about 6500 rpm. went with eagle 5.7 rods and hyper pistons. it does make me want to tell the ole lady she has to sleep on the couch. lol should be gettin my block back this Friday so just need to order some ARP bolts real quick so I can get started when it comes. any one know any good paint for blocks. not the spray kind. brush on

My wife got tired of me penching pennies and agonizing over parts decisions and handed me a credit card and told me to finish it so we could ride in it before we get too old.
I just used the spray on engine paint. It looks good and will probably last what's left of my life with no problem. look at my photos. You'll see the similarities in our projects.

[ChevroletSS]

Well the reason I want brush on paint is cause Ive never used it and wanted to give it a try. Heard it applys better plus everytime Ive use spray paint on blocks I never get into the creases very good and end up puttin to much on and it runs. I mean it might not be a big deal to some but I will have lots of money in this and figured ill take my time makin it look as good as it runs. Hopefully.




Would it be ok to use a stock oil pan (4 quart) on this. Would it have clearence for the stroker crank. I am going to use the factory windage tray. If it wont Can anyone point me to one that will work that doesnt cost an arm and a leg. Cant find a 383 oil pan one peice on jegs or summit.

[vinniekq2]

Originally Posted by ChevroletSS

it's a steel crank. figured might as well get a descent one if I'm gonna be runnin around 500 horses and up to about 6500 rpm. went with eagle 5.7 rods and hyper pistons. it does make me want to tell the ole lady she has to sleep on the couch. lol should be gettin my block back this Friday so just need to order some ARP bolts real quick so I can get started when it comes. any one know any good paint for blocks. not the spray kind. brush on

put a 6 quart pan on it. I can give many reasons but you already stated 6500 rpm

[ChevroletSS]

Thanks for the info

[ChevroletSS]

Can anyone help me out with what pickup I should use with this oil pan.


Thanks for the help


http://www.jegs.com/i/JEGS-Performan...ductId=1026994