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Old 08-17-17, 11:55PM   #61
turbo louie
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So now I know the 6x4 head is the one of choice and that's all good. But I started this thread because I have a pair of 13s and 16's . So I decided to use the 16's being I have them. But the problem is im never going to get 14 to 1 with out pop up pistons right ? Im not a fan of a dome but i have them. So does anyone know if the pistons I posted a picture of can be milled to fit a 16's chamber? Does anyone know of anyone doing this and it working out for them?
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Old 08-18-17, 01:11AM   #62
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Old 08-18-17, 02:21AM   #63
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Nice thanks
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Old 08-18-17, 02:26AM   #64
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I looked at the picture of your dome pistons. It'll be tough getting someone to mill those, it could be done though, question is, how much can you take off, and what's the end resualts, compression wise.

Personally I would'nt use those Pistons just to much area for detonation and hot spots, if your planing on running allot of compression, but that's just me.
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Old 08-18-17, 02:26AM   #65
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If you were going to turbo a 350 you could throw a set of 6x-6 on it and to lower the cr .
Put 6X-8 on it and run a lot of boost.

Same deal for a 400 but the -8 would be the next largest chamber .
To lower the CR further would require a dish in the piston top.

You wanna go the opposite way and go high squeeze cr NA race gas or alcohol deal with the 13s.

Dome pistons ,if they are too severe or not prepped right ,can screw with the flame front travel and create hot spots ,especially w/ gasoline.
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Old 08-18-17, 03:05AM   #66
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Thanks for the pics its clear now.

Thanks Gach, I figured you were going to say that. Its just that I have them I would like to use them .

How much do you think can be milled off the 16's ?
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Old 08-18-17, 11:14AM   #67
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Old 08-18-17, 11:50AM   #68
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I called my machinist today and he told me he has put these pistons in a motor with 85cc eheads . So maybe its possible I can do it with a 16.
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Old 08-18-17, 01:49PM   #69
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I HAVE to know what the dome vol is and also if the shape is compatible with the 16s!They for sure were designed for large vol heads.Tom
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Old 08-18-17, 01:58PM   #70
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http://butlerperformance.com/rt-5038...ac-engine.html
Butler has some good info on the various heads on their site as well.

6X-4 have a stock chamber volume of 93.74 cc.
Ya gotta shave 'em .060 to get close to 87cc

I know the -4 -6 -8 stamping system was also used on the 4X & 5C heads (also came w/ screw in studs,guide plates & 2.11/1.66 valves. but the Butler chart does not directly correlate the 6X type stamping system to the 4X & 5C chamber volumes .

I once had a set of junk 5C heads that were stamped with a 6 or an 8 that came off a 75 400.

Stock 13 is a 72cc chamber so that is gonna be tight with the domed pistons you have.
The domes may have to be machined to work with the 13.
If you have a way to mock all that up would be very beneficial.
That way you'll be able to see where the interference issues are between the piston /chamber & valve opening & closing events.
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Old 08-18-17, 02:28PM   #71
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I meant to say YOU have to know the dome vol!Tom
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Old 08-18-17, 03:45PM   #72
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Quote:
Originally Posted by turbo louie View Post
I called my machinist today and he told me he has put these pistons in a motor with 85cc eheads . So maybe its possible I can do it with a 16.
Their definitely big chamber Pistons 85 cc. It would tough to figure out to dome volume. I'm trying to think how'd you do it. I suppose you could have them cut down the guys who ran the SD heads ran like a 1/2" flat dome, to get compression up to 12.1 or maybe even better. I'll check out the Butler link and what info it gives. If you knew the piston company that made them piston I'll bet they could tell you, if their still in business.
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Old 08-18-17, 04:22PM   #73
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I HAVE to know what the dome vol is and also if the shape is compatible with the 16s!They for sure were designed for large vol heads.Tom
They have a 19.5 cc dome
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Old 08-18-17, 04:25PM   #74
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Quote:
Originally Posted by sprint250 View Post
http://butlerperformance.com/rt-5038...ac-engine.html
Butler has some good info on the various heads on their site as well.

6X-4 have a stock chamber volume of 93.74 cc.
Ya gotta shave 'em .060 to get close to 87cc

I know the -4 -6 -8 stamping system was also used on the 4X & 5C heads (also came w/ screw in studs,guide plates & 2.11/1.66 valves. but the Butler chart does not directly correlate the 6X type stamping system to the 4X & 5C chamber volumes .

I once had a set of junk 5C heads that were stamped with a 6 or an 8 that came off a 75 400.

Stock 13 is a 72cc chamber so that is gonna be tight with the domed pistons you have.
The domes may have to be machined to work with the 13.
If you have a way to mock all that up would be very beneficial.
That way you'll be able to see where the interference issues are between the piston /chamber & valve opening & closing events.
Thanks. im going to compare them to se if its possible . I may just have to get different pistons.
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Old 08-18-17, 04:27PM   #75
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Quote:
Originally Posted by Gach View Post
Their definitely big chamber Pistons 85 cc. It would tough to figure out to dome volume. I'm trying to think how'd you do it. I suppose you could have them cut down the guys who ran the SD heads ran like a 1/2" flat dome, to get compression up to 12.1 or maybe even better. I'll check out the Butler link and what info it gives. If you knew the piston company that made them piston I'll bet they could tell you, if their still in business.
I left 1 thing out . He also said he had to shave the dome to get it to work with the ehead.
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