Is it true that a head off of a 60 Lark L6 will give a significant compression increase if installed on a 185??
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Head swap???
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NO...it is not true, while a 1960 170 C.I. does have higher compression than the 185 the pistons are different. You will only get about a 1/4 point increase by switching the heads. The best way to increase compression on that engine is to mill the head and/or bore the cylinders. Now with that said IMHO the 1960 head is a somewhat better head than the original on a 185. Hope this helps.
Joe
Originally posted by cycledog View PostIs it true that a head off of a 60 Lark L6 will give a significant compression increase if installed on a 185??Last edited by irish; 11162010, 09:26 PM.sigpic
1962 Daytona
1964 Cruiser
And a few others
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Originally posted by irish View PostNO...it is not true, while a 1960 170 C.I. does have higher compression than the 185 the pistons are different. You will only get about a 1/4 point increase by switching the heads. The best way to increase compression on that engine is to mill the head and/or bore the cylinders. Now with that said IMHO the 1960 head is a somewhat better head than the original on a 185. Hope this helps.
JoeRon Dame
'63 Champ
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Unfortunately Ron, like most things in life, it isn't that simple. But their are some simple math formulas to calculate the new compression ratios, to calculate how much to mill or bore to acheive a certain comp. ratio etc. You can find the formulas online.
Joesigpic
1962 Daytona
1964 Cruiser
And a few others
Comment

Originally posted by irish View PostUnfortunately Ron, like most things in life, it isn't that simple. But their are some simple math formulas to calculate the new compression ratios, to calculate how much to mill or bore to acheive a certain comp. ratio etc. You can find the formulas online.
Joe
My reason for asking is the 185 OHV6 I built...Using my guesstimate, the CR would be about 9.25, but you suggest it would be less...how can I find out?
RonRon Dame
'63 Champ
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Yes there is Ron, If you start with the original factory compression ratio of an OHV 6 (assuming here that the shop manual is correct) 8.3 to 1 you would first calculate for any increase in bore size then you would calcuate for the increase in stroke. Unfortunately it's hard to list the formulas here otherwise I would. I have a book with the formulas, you can email me with what you have and I could tell you the compression ratio.
Joesigpic
1962 Daytona
1964 Cruiser
And a few others
Comment

Originally posted by irish View PostYes there is Ron, If you start with the original factory compression ratio of an OHV 6 (assuming here that the shop manual is correct) 8.3 to 1 you would first calculate for any increase in bore size then you would calcuate for the increase in stroke. Unfortunately it's hard to list the formulas here otherwise I would. I have a book with the formulas, you can email me with what you have and I could tell you the compression ratio.
Joe
RonRon Dame
'63 Champ
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