cam specs?

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PRINCETON_JAKE

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Jan 5, 2010
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I cant seam to find a list of the current different cams and specs you make for 12valves, i also saw on your forum you were going to make oversized valves too, but couldnt find any real info on them. I was also wondering what the stock rocker arm ratio is on a 12 valve.

I found this in an OLDER post...

181/210 .280/.307 107LSA
183/220 .280/.316 106.5LSA
188/225 .310/.319 108LSA
215/232 .319/339 108LSA
223/232 .370/367 108LSA
 
This is what i found on your new dyno thread...

181/210
188/220
200/220
232/252

I want to deck my head to protrude the valves alittle, but i dont know how much because i havent brought it in to get looked at and measured. I WONT be touching/decking the block, but i dont know how much to cut them until i measure everything. I also want to keep it streetable, not a daily driver, but if i want to run around, i want to be able too. from what ive read the 188 would probably be best, but what about the 200? what are the down falls, if any?
 
They vary considerably. We use 1.69 in the shop to cover our selves when talking coil bind.

181/210 .290/.310 106.5lsa
188/220 .310/.320 108lsa
200/220 .340/360 108lsa
207/220 .360/.360 108lsa
232/252 .370/.370 107lsa

We also have a few new grinds about to be released
 
Hamilton Cams said:
They vary considerably. We use 1.69 in the shop to cover our selves when talking coil bind.

181/210 .290/.310 106.5lsa
188/220 .310/.320 108lsa
200/220 .340/360 108lsa
207/220 .360/.360 108lsa
232/252 .370/.370 107lsa

We also have a few new grinds about to be released
Click to expand...

On the rockers, they are made sloppy/uneven from the factory, or differnt models/year 12valves used different lenghts?

As fas as cams go do you have "general" numbers as to how much is "usually" cut from the pistons for the bigger cams?

I can have the entire tops cut off ALOT cheaper then fly cutting, but i dont really want to sacrifice compressiong and driveability that bad.
 
sloppy results cause the differences

181/210 .290/.310 106.5lsa no flycuts if less than .015" block/head decked
188/220 .310/.320 108lsa no fly cuts if no decking, check clearances.
200/220 .340/360 108lsa .070" fly cuts recommended, none if you play with things a bit
207/220 .360/.360 108lsa same as 200/220
232/252 .370/.370 107lsa .150"

I like compression, it makes things better in most instances, cutting compression on a street truck with unecessary flycuts is not cool. If you know how and what to check, the fly cuts are either unecessary or can be made smaller in most instances. I put them out as suggestions to cover myself for people that are too lazy or unable to check clearances and centerlines.

Zach
 
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