looking for 302 pistons - recommendations? - Team Camaro Tech
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post #1 of 15 (permalink) Old Sep 12th, 12, 06:55 AM Thread Starter
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Rich
 
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looking for 302 pistons - recommendations?

Hello guys I am looking for recomendations for pistons for my 302 +.030 build - I have searched, I spoke to Jerry M (he recomended J/E pistons but I cant see $1200$ for a set of race pistons for a driver) I have also looked at Ricks Hypereutectics, I know they say TRW or Speed pro have wrong ring grooves 1/16" vs 3/32" but is there anything wrong with them? plans for my car is for cruise nights and some trips in my car no drag racing (not official anyway ) what have Y'all used on yours and pros/cons? and whats the stock dome height .250? I want to be at 11:1 no decking done to DZ block
Thanks

69 R/S Z/28 302 X33 D80 late 09C
69 T/A clonification LS6-6speed under construction
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post #2 of 15 (permalink) Old Sep 12th, 12, 08:35 AM
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Re: looking for 302 pistons -recomendations?

I'm running Keith Black Pistons around $600

http://www.rpmmachine.com/shop/index..._detail&p=5974

I think Summit has them as well

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post #3 of 15 (permalink) Old Sep 12th, 12, 08:52 AM
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Re: looking for 302 pistons -recomendations?

Nothing wrong with trw/sealed power forged. Might want to take advantage of 0 decking with any piston to gain desirable quench when running higher compression. Decking block around your DZ stamp is possible.
Nothing wrong with 1/16" rings or 3/32" but in either case , get .005 larger rings to file fit into bore.
You did not mention heads or cam but I feel for what you said will be done with this car, all this is possible without those silocone pistions. They are nice but will you need it?

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #4 of 15 (permalink) Old Sep 12th, 12, 12:06 PM Thread Starter
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Re: looking for 302 pistons - recommendations?

Thanks guys, this will have 186 heads and stock intake, exh manifolds and Crane blueprint 30/30 302 cam. the speed pros I have looked at have a coated skirt L2210AF I called Jegs and they are now DD - had 6 std bore no O/S said dome was .410' = 12.05 w/ 64cc he said he would fax me a copy of the data in the catalog


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69 T/A clonification LS6-6speed under construction
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post #5 of 15 (permalink) Old Sep 12th, 12, 01:20 PM
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Re: looking for 302 pistons - recommendations?

http://www.ebay.com/itm/DZ-302-PISTO...60bf7c&vxp=mtr

Will this work for you?

Does not say how much compression here but I did get into something like this long ago, used 76 cc heads and still managed to run well. But if you have to have new pistons, might try SRP also or Manley or Probe.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #6 of 15 (permalink) Old Sep 12th, 12, 01:59 PM
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Re: looking for 302 pistons - recommendations?

I used Wiseco forged, undecked block with .026 GM comp head gasket per JM's recommendations. The "ideal quench" has never been an issue.

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post #7 of 15 (permalink) Old Sep 12th, 12, 04:43 PM
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Re: looking for 302 pistons - recommendations?

Try SRP 202890. Around $500/set shipped.

1969 04A Van Nuys-built Z/28. Cortez Silver with dark blue interior and VE3. Sold Clippinger Chevrolet. Raced at Lions in LA.
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post #8 of 15 (permalink) Old Sep 12th, 12, 05:38 PM
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Re: looking for 302 pistons - recommendations?

free shipping on these:

http://www.ebay.com/itm/SRP-202890-F...971efb&vxp=mtr


Says 11.4 compression with a 58 cc head. Should be about right with a 64 cc head.

Or.. you can cut the domes on the L2210A pistons. There are still some out there.

Lynn
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post #9 of 15 (permalink) Old Sep 12th, 12, 11:46 PM
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Re: looking for 302 pistons - recommendations?

go with the SRP 202890 pistons.the KB is good but not as good is the SRP

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post #10 of 15 (permalink) Old Sep 13th, 12, 06:30 AM Thread Starter
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Re: looking for 302 pistons - recommendations?

Quote:
Originally Posted by z28rich View Post
go with the SRP 202890 pistons.the KB is good but not as good is the SRP
compression shows to be 10.4 and I have yet to see a picture of the acual piston. a 6.5cc dome doesnt sound like much, what is so good about them?
I was wanting to stay at 11:1
I am still leaning towards the Speed Pros and taking off about .150
I know they arent the lightest things out there but this is a driver

69 R/S Z/28 302 X33 D80 late 09C
69 T/A clonification LS6-6speed under construction
15 ZL1
64 Chevelle wagon 6.0l planned sons toy
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post #11 of 15 (permalink) Old Sep 13th, 12, 03:20 PM
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Re: looking for 302 pistons - recommendations?

Quote:
Originally Posted by zman1969 View Post
I have yet to see a picture of the acual piston.
Google is your friend
There is also a picture in the eBay link that Lynn posted just above.
Try a compression calculator for your specific setup - Summit has one on their website, and there are plenty available by searching. I was going to buy the SpeedPros but (without milling the domes) it worked out at about 11.7:1 compression. Too much for the 98 octane fuel I generally use. The SRP 202890 has a slightly smaller dome volume (-6.5cc instead of the SpeedPro's -15.2cc) and gave the comp ratio I was looking for.
It's also worth noting that the specified piston height varies between manufacturers, by up to 0.025, so that needs to be factored in, along with the compressed gasket thickness, when determining your quench distance.

1969 04A Van Nuys-built Z/28. Cortez Silver with dark blue interior and VE3. Sold Clippinger Chevrolet. Raced at Lions in LA.

Last edited by ZLP955; Sep 13th, 12 at 04:24 PM. Reason: added piston height info
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post #12 of 15 (permalink) Old Sep 13th, 12, 10:49 PM
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Re: looking for 302 pistons - recommendations?

Quote:
Originally Posted by zman1969 View Post
compression shows to be 10.4 and I have yet to see a picture of the acual piston. a 6.5cc dome doesnt sound like much, what is so good about them?
I was wanting to stay at 11:1
I am still leaning towards the Speed Pros and taking off about .150
I know they arent the lightest things out there but this is a driver
SRP pistons are in a different league compared to speed pro.you better check the what compression you have the SP is to high

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and Black Deluxe Int. I found my build sheet
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post #13 of 15 (permalink) Old Sep 13th, 12, 11:06 PM
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Re: looking for 302 pistons - recommendations?

i have a set of 20 over pistons that came with the car i just bought .they are new on the rods im not going to use them im going to buy the high dollar stuff for my Z28

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post #14 of 15 (permalink) Old Sep 17th, 12, 06:30 AM Thread Starter
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Re: looking for 302 pistons - recommendations?

Quote:
Originally Posted by z28rich View Post
SRP pistons are in a different league compared to speed pro.you better check the what compression you have the SP is to high
I didnt know there was a piston league, so whats so much better? thet are over a half a point off in compression already - strike 1


I am now thinking about the Ricks pistons- they are Hypereutectic not forged- I can live with that this engine will be a driver so wheres the down side to that? GM uses that type in their strongest crate motors - ZZ383 for example. they are quieter should use less oil and they are the correct dome. anybody used them? what size rings do they take? 3/32 or 1/16"

69 R/S Z/28 302 X33 D80 late 09C
69 T/A clonification LS6-6speed under construction
15 ZL1
64 Chevelle wagon 6.0l planned sons toy
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post #15 of 15 (permalink) Old Sep 17th, 12, 01:23 PM
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Re: looking for 302 pistons -recomendations?

Quote:
Originally Posted by Metal Man View Post
I'm running Keith Black Pistons around $600

http://www.rpmmachine.com/shop/index..._detail&p=5974

I think Summit has them as well
Rich,
The KB's are forged and finished I'm running them on California 91 octane
@ 11:1 and no detonation or pinging problems. My engine builder is highly respected in the racing industry and I went with his suggestion on this set up, couldn’t be happier with my little high winding 302. BTW I swapped out to Eagle SIR rods as well.
More info:
http://www.uempistons.com/assets/icon_catalog.pdf

---Dean

Fathom Green 69 RS Z/28 DZ302
And a few Hot Rods

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