WELL NICE TO MEET ALL YOU GUYS GREAT FORUM WELL HERES THE STORY IM BUILDING A HAGR DRAGSTER SLANT POWER SO I BOUGHT A SLANT ON EBAY FOR $26.99 THE ENGINE WAS COMPLETELY REBUILT LESS THAN 20 MILES ON O/H SO I TORE IT DOWN TO LOOK SURE THING SPOTLESS ALL NEW BORED 0.30 LOOKS NICE EXCEPT THE PISTONS SIT ABOUT .175 IN THE HOLE THY ARE FLAT TOPS WHY ARE THEY DOWN SO FAR I SEE EVERYONE IS MILLING .100 OFF THE CYL HEADS BUT ID STILL LIKE TO GET THAT PISTON UP TO 0 DECK HIGHT LET ME KNOW WHAT YOU GUYS THINK THANKS BILL

Bill, that's about typical for a stock slant. The original factory static C/R was rated at 8.2:1, and accurate calculations will show that many of them were down in the high 7's for ratio. Fortunately, there's a lot of material on both the deck surface of the block, and the deck surface of the head, so milling is a good option to raise the compression.
You might want to peruse the articles section off the main page of this site.

Roger

WELL I SPOKE WITH A GUY AT CLIFFORD TODAY AND HE SAID THERE MUST BE SOME MIX MATCH PARTS IN THIS THING HE CLAIMS HE HAS NEVER SEEN A SLANT WITH THE PISTON ANY FURTHER THAN .040 IN THE HOLE

I don't think he has ever seen the inside of a slant six. He is sooooooo wrong. A 170 engine is a "zero deck" motor, and most of them have the piston down in the hole by .015 - .040.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

This is why you should not talk to anyone at Clifford. My slant is .116 in the hole AFTER I decked the block .060.

The reason he never saw one further than .040 is he never has seen a slant with the head off.

You have a perfectly normal motor.......really.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Just a suggestion......could you turn off your caps lock?

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Yeah....Im the one who destroyed this rare, vintage automobile.....

I don't think he has ever seen the inside of a slant six. He is sooooooo wrong. A 170 engine is a "zero deck" motor, and most of them have the piston down in the hole by .015 - .040.

Bill, welcome to the site, but do you think you could turn the "caps lock" off, and use some periods, and commas?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

opps i didnt know on the cap locks and thanks guys im also a crappy speller lol

That's OK, we have spell check. Punctuation helps heaps too, but the board doesn't have anything for that.

My '73 225 has the pistons .177" down in the hole. My combustion chambers were 62cc so I had .080 taken off the head and will take .100" off the block to get from 7.7:1 up to 10:1. I just hope I have valve to piston clearance!

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Joshua

ok thanks for all the help guys

How much compression do you want to run?
What cam are you planning to use?
DD

the biggest of both thanks bill

Welcome to the site.

Please define "biggest." 14:1 comp? 280 duration @0.050"? What fuel?

Lou

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Home of Slant6-powered fun machines since 1988

ok so the engine is new but stock so i would like to gain as much compression as i can shave th block or head or both and put the biggest cam i can get away with out valve to piston problems so im thinking like 480 lift cam bolt it in check v/c and start milling what ya thaink thanks again bill

How strong do those pistons look? Are they cast pistons with a steel expansion strut around the pins?
Do the pistons have a large cut or drilled holes under the oil ring?
Does your budget allow for a nice set of custom made, high compression forged pistons?
DD