350 Pistons - Great Lakes 4x4. The largest offroad forum in the Midwest

SS · June 11th, 2006, 10:17 PM

Chevy 350 piston question for you guys

It's a 1977 Chevy 350 with a stock bottom end, milled heads, 3 angle valve job, crane cam, edelbrock performer rpm intake and headers. The block is cracked along a water jacket so I'm having the block swapped out and while it's apart I figured I might as well get the compression up a little bit since it is a 77 motor and is probably pushing 8.5:1 or close to it.

I'm not looking to pushing it to the max here... just a little more power out of it.

Should I go with domed, dished or flat top pistons and what's the difference? I'm trying to shoot towards a 9.5:1 CR but I'm not also out to break the bank here.

Looking to spend a max of around $200 for the set with rings.

Iron or moly rings?

Any brands to stay away from?

CHVYPWR · June 13th, 2006, 02:20 PM

Flat tops would be the way to go with what you have.

halfgassed · July 11th, 2006, 11:40 AM

if your lookin gfor a good value in jegs I believe they were silvolite has some hypereutic (SP?) pistons that when used with a 64cc head had a compression ratio of 10.3:1, and cost about $120 for all 8. I ran them in a motor I built 25,000 miles ago and still holding strong after lots of abuse. Good value, if your heads are 76 cc chamebr it'll probably lower the comp ratio closer to what you desire.

Haggar · July 11th, 2006, 11:57 AM

How much was milled off the heads? Have you checked the CC volume on them after milling?

Deaner · July 11th, 2006, 02:38 PM

I put dome top with 305 heads on my 350 and it pushing 12:1 or alittle higher of course along with other poopoo

Yetti · July 11th, 2006, 05:46 PM

the stock pistons are junk anyways. the tops are releived to give about 7.8:1 stock. they are piss poor for the year your working with. the crank should be ok but everything else that came stock in that motor sucked

If I was building it I would use TRW flat tops with single valve reliefs

KILLER"B"468 · July 11th, 2006, 06:28 PM

wasn't all this covered in another thread you sarted...

Flat tops, molly rings have a nice day

SS · July 11th, 2006, 11:21 PM

Quote:

Originally Posted by KILLER"B&quot

wasn't all this covered in another thread you sarted...

Flat tops, molly rings have a nice day

Yes. That's why I'm suprised this thread is alive

June 11th, 2006, 10:17 PM	#1
SS Fight! Fight! Fight! Join Date: 12-12-05 Location: Washington Twp Posts: 5,326 iTrader: (9)	350 Pistons Chevy 350 piston question for you guys It's a 1977 Chevy 350 with a stock bottom end, milled heads, 3 angle valve job, crane cam, edelbrock performer rpm intake and headers. The block is cracked along a water jacket so I'm having the block swapped out and while it's apart I figured I might as well get the compression up a little bit since it is a 77 motor and is probably pushing 8.5:1 or close to it. I'm not looking to pushing it to the max here... just a little more power out of it. Should I go with domed, dished or flat top pistons and what's the difference? I'm trying to shoot towards a 9.5:1 CR but I'm not also out to break the bank here. Looking to spend a max of around $200 for the set with rings. Iron or moly rings? Any brands to stay away from? __________________ -Jeremy

June 13th, 2006, 02:20 PM	#2
CHVYPWR D.I.L.L.I.G.A.F. Join Date: 11-05-05 Location: Vicksburg, Mi. Posts: 1,608 iTrader: (11)	Flat tops would be the way to go with what you have.

July 11th, 2006, 11:40 AM	#3
halfgassed Senior Member Join Date: 06-22-06 Location: da yoop Posts: 199 iTrader: (7)	if your lookin gfor a good value in jegs I believe they were silvolite has some hypereutic (SP?) pistons that when used with a 64cc head had a compression ratio of 10.3:1, and cost about $120 for all 8. I ran them in a motor I built 25,000 miles ago and still holding strong after lots of abuse. Good value, if your heads are 76 cc chamebr it'll probably lower the comp ratio closer to what you desire.

July 11th, 2006, 11:57 AM	#4
Haggar Covered in mud... Join Date: 11-06-05 Location: Oxford, MI Posts: 16,813 iTrader: (48)	How much was milled off the heads? Have you checked the CC volume on them after milling?