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Closed chamber heads straight swap from open?
#31
83slimer;284115 Wrote:
barnett468;284106 Wrote:ok, to get the optimum benefit from closed chamber heads, you should set your quench/squish clearance between .034" and .043" . it can be checked by simply determining exactly hw car down below the deck the pistons are at tdc . cometic makes head gaskets that are thinner than stock if you need one.

ok so put # 1 at tdc and measure to deck height, without head gasket ? then should be between .034 and .043?

yes
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#32
You do not want the piston .030-.040 down the bore. You want the piston .000-.005 down the bore. The squish is then the compressed thickness of the head gasket, about .040, plus the .000-.005 that the piston is down the bore at TDC. Chuck
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#33
Does anyone know the stock piston to deck height on a '73 H-Code?

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#34
ummm, yeah, i forgot to clarify that you add the distance of the piston in the hole to the thickness of the gasket and that number is the clearance.

Factory piston depth on a non boss351 can be around .020".
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#35
73pony;284119 Wrote:Does anyone know the stock piston to deck height on a '73 H-Code?

You'll need to look up the compression height of the factory piston. I cannot say for sure what the 73 2 V is, but the factory compression height for my 71 4v flat tops is 1.65" ( center of the wrist pin to top of piston) With standard numbers added up, that gave a measurement of .028" deck height. In my case, using KB pistons, the comp ht is 1.67" and with decking, my deck height is zero". The gasket compressed height is about .040" my builder tells me that is the "squish" height if you like.
I'll look to see if I can find that comp ht number and edit this.
Edit: I was not able to find the numbers and time is short right now, but it looks like the 73 had dish top pistons as those engines were only about 8:1. I would think that the comp ht. was the same, but ????
Below is the numbers from KB (UEM Pistons) with respect to the 71 4V with .030" overbore.
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#36
barnett468;284121 Wrote:ummm, yeah, i forgot to clarify that you add the distance of the piston in the hole to the thickness of the gasket and that number is the clearance.

Factory piston depth on a non boss351 can be around .020".

Hey Barnett, good to hear from you again, it's been awhile.
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#37
Stanglover;284126 Wrote:
barnett468;284121 Wrote:ummm, yeah, i forgot to clarify that you add the distance of the piston in the hole to the thickness of the gasket and that number is the clearance.

Factory piston depth on a non boss351 can be around .020".

Hey Barnett, good to hear from you again, it's been awhile.

Hey, thanks . Yeah I have had my hands full regrouping my life a bit . We recently moved to a smaller home and still have unpacked boxes all over . Need to build a 12 x 15 foot shed for all that plus all my parts . Also started buying, fixing and selling the older Mustangs again . Went thru 7 of them in the last 6 months and have 2 more sitting in the driveway waiting for a few things . I had stopped that for a while to work on other things but now that I have gotten back into doing that my spare time to look at the forum is very limited.

Hope things are well with you and Happy Holidays!
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#38
barnett468;284127 Wrote:
Stanglover;284126 Wrote:
barnett468;284121 Wrote:ummm, yeah, i forgot to clarify that you add the distance of the piston in the hole to the thickness of the gasket and that number is the clearance.

Factory piston depth on a non boss351 can be around .020".

Hey Barnett, good to hear from you again, it's been awhile.

Hey, thanks . Yeah I have had my hands full regrouping my life a bit . We recently moved to a smaller home and still have unpacked boxes all over . Need to build a 12 x 15 foot shed for all that plus all my parts . Also started buying, fixing and selling the older Mustangs again . Went thru 7 of them in the last 6 months and have 2 more sitting in the driveway waiting for a few things . I had stopped that for a while to work on other things but now that I have gotten back into doing that my spare time to look at the forum is very limited.

Hope things are well with you and Happy Holidays!

Glad things are all okay. Life does get in the way of having fun sometimes. All's well here, can't wait for Spring!!
Merry Christmas and Happy New Year to you and everyone else too ..... or, if you're politically correct, Happy Holidays.
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#39
barnett468;284121 Wrote:ummm, yeah, i forgot to clarify that you add the distance of the piston in the hole to the thickness of the gasket and that number is the clearance.

Factory piston depth on a non boss351 can be around .020".

Thanks!!!
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