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09-16-2017, 12:46 AM | #1 |
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Need .030 pistons for a Vortec 350 in 1.56 compression height
I will be building a Vortec 350 pretty soon that is in need of a .030 over bore. I would like to retain the stock 9.5 compression, however, I don't see any pistons put there that have the stock type piston top at .030 with the 1.56 compression height. I do see a ton of them in the 1.54 compression height. If all else fails, would I have to remove the difference off of the block plus what ever it takes to get zero deck? I am looking for this style.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
09-16-2017, 02:59 PM | #2 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I believe the thinking is that if you're boring .030 over you probably will want to deck the block. I did on mine. To me it's reassuring to have the fresh metal for a sealing surface.
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09-16-2017, 03:39 PM | #3 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
Why not just order a new long block?
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09-16-2017, 06:47 PM | #4 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
Have you cc'd the stock pistons to verify what your looking for? I believe the stock was a 9-11cc dish with the 4 eyebrow and 0.060" recess/ dish.
Ya too many of the builders pistons are a reduced CH which is just STUPID. I don't get why KB and TRW have done that. Making the quench bigger on these motors is not a move in the right direction. The SpeedPro L2403NF30 will gt you there, but in forged not hypereutectic and a bit pricy at $310 with a slummit racer discount
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
09-16-2017, 07:39 PM | #5 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I had a set of LT-1 pistons and that's what I used in my L31. It had to help the quench over those large dishes in the stock piston.
I also decided on aluminum cylinder heads. No problem with detonation that I know of.
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09-16-2017, 08:49 PM | #6 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I have a complete and disassembled L31 and I just wanted to rebuild what I have. If I were to use a 1.54 piston, how much deck removal could the block take assuming that it may not even be at zero deck with a 1.56? Not at all opposed to decking.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
09-17-2017, 12:56 AM | #7 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I just ordered a set of .040 over pistons from Summit Racing 1.56 comp height.
Here's the link for the .030 over ones. https://m.summitracing.com/parts/sum-17350c-30 |
09-17-2017, 02:52 AM | #8 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
Thank you. I did come across those. They may create too much compression as they only have a +6 cc valve reliefs. I would need something in the +12 range.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
09-17-2017, 03:03 AM | #9 |
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09-17-2017, 07:44 AM | #10 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I'm pretty sure Mahle has a "D" dish that would build a Zero-deck 0.04 quench motor. I bought a set for my towing 383 / vortec head motor. They were a pretty nice piston with coated skirts floating pin and such. But I'm afraid anything that fits your bill perfectly is going to be a custom piston, (around $650) or your machinist is going to have to cut the dish to exac volume. (=adding $s till it's about the same as a single change piston order anyways) Seems no one I ran across has the exact configuration your looking for in a stock stroke.
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
09-17-2017, 08:42 AM | #11 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
Whats wrong with a little more compression? I ran 10:1 in a TBI 406 running 87. think it pulled harder than the Vortec 454 I had.
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09-17-2017, 12:23 PM | #12 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I would be running a carb. I just want a cool running engine that can use 87 octane. I will be using the 383HT/350 HO cam. After doing the calculations, I could run a flat top with a thicker head gasket (.051) and it would come out to 9.6 or so.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies Last edited by crm318; 09-17-2017 at 12:28 PM. |
09-17-2017, 02:26 PM | #13 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I will be running the same road soon. Please let us know how you did. I believe Marv has a very good indication of what needs to be done.
https://www.youtube.com/watch?v=A0TalLrtZ24 Let em rip! |
09-17-2017, 05:56 PM | #14 |
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Re: Need .030 pistons for a Vortec 350 in 1.56 compression height
I hope to choose wisely!
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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