Pistons/Rings replacment - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C17FCC · 11-10-2016, 03:43 PM

So as some of you know I am in the process of taking my 350sb apart in my 1970 GMC. I currently have most of the replacement parts picked out with the E-Street Power package from Edelbrock, I went with the 2038 Kit which advertises 338HP and 389ft lbs. I am trying to get some opinions on a good set of pistons that will work well with this set up. I dont want to break the bank on it with a set of Mohles but I would like quality and something that will last and stand up to the pressure and demand. If anyone has any recommendations or ideas I would greatly appreciate it.

trac209 · 11-10-2016, 04:15 PM

In my opinion unless you are planning to use a power adder like nitrous or turbo a cast piston from just about any reputable source is just fine. I've used the trw,sealed power and summit all with good results. Other than compression ratio brand will have little effect on your overall setup.

GASoline71 · 11-10-2016, 05:38 PM

What are the cam specs for that kit? The Edelbrock top end kits are very conservative with their cam profiles\are
Gary

GRX · 11-10-2016, 05:42 PM

Agree about cast pistons for the most part. Regarding rings - as a machinist/builder I would not recommend chrome or moly rings unless you have fresh round & straight bores. Preferably plateau honed. If not they can take very long time to fully seat, if at all.

C17FCC · 11-10-2016, 08:09 PM

Quote:

Originally Posted by GASoline71

What are the cam specs for that kit? The Edelbrock top end kits are very conservative with their cam profiles\are
Gary

This is the Cam that is in the kit
https://www.summitracing.com/parts/edl-2102

C17FCC · 11-10-2016, 08:13 PM

Quote:

Originally Posted by GRX

Agree about cast pistons for the most part. Regarding rings - as a machinist/builder I would not recommend chrome or moly rings unless you have fresh round & straight bores. Preferably plateau honed. If not they can take very long time to fully seat, if at all.

I will most likely get the block machined and cleaned up so its all the same. If that is what you mean by fresh round and straight bores

**70STOVEBOLT** · 11-10-2016, 08:26 PM

Plasma moly rings are forgiving of imperfections in the cylinder bore and are designed to seat almost immediately. I used these in an engine that I had used a ball hone on the original bores and these rings worked perfectly. No smoke at all upon startup or since, and no oil consumption.

11-10-2016, 03:43 PM	#1
C17FCC Registered User Join Date: Aug 2016 Location: Travis AFB California Posts: 54	Pistons/Rings replacment So as some of you know I am in the process of taking my 350sb apart in my 1970 GMC. I currently have most of the replacement parts picked out with the E-Street Power package from Edelbrock, I went with the 2038 Kit which advertises 338HP and 389ft lbs. I am trying to get some opinions on a good set of pistons that will work well with this set up. I dont want to break the bank on it with a set of Mohles but I would like quality and something that will last and stand up to the pressure and demand. If anyone has any recommendations or ideas I would greatly appreciate it.

11-10-2016, 04:15 PM	#2
trac209 Registered User Join Date: Dec 2011 Location: winnipeg Posts: 1,107	Re: Pistons/Rings replacment In my opinion unless you are planning to use a power adder like nitrous or turbo a cast piston from just about any reputable source is just fine. I've used the trw,sealed power and summit all with good results. Other than compression ratio brand will have little effect on your overall setup.

11-10-2016, 05:42 PM	#4
GRX Registered User Join Date: Jul 2010 Location: MD Posts: 1,937	Re: Pistons/Rings replacment Agree about cast pistons for the most part. Regarding rings - as a machinist/builder I would not recommend chrome or moly rings unless you have fresh round & straight bores. Preferably plateau honed. If not they can take very long time to fully seat, if at all. __________________ 1969 c-10 Step Side Long Bed. I-6 250cid = = 1969 Pontiac GTO hard top. 400, 4-speed.

11-10-2016, 08:26 PM	#7
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,321	Re: Pistons/Rings replacment Plasma moly rings are forgiving of imperfections in the cylinder bore and are designed to seat almost immediately. I used these in an engine that I had used a ball hone on the original bores and these rings worked perfectly. No smoke at all upon startup or since, and no oil consumption. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear



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