TSP 231/237 users with milled heads....
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From: Sierra Vista, AZ
TSP 231/237 users with milled heads.... Need some help.
tsp 231 / 237 .591/.598 @ 112*
TR 242 / 248 .608/.612 @ 110+2*
TR TRx makes life in stock engine, heads etc....with .070 clearance.
My heads 2.02/1.60 valves, milled .022
Stock gaskets are .052" compressed, gaskets to be used are .060" compressed.
Not sure the dynamic relationship behind the valve events, I have read until my eyes bleed and still have a hard time digesting the whole relationship.
Here goes:
Use -.022 milled heads, add .008 from gaskets equals -.016. Difference in cam (not sure of events as stated for relationship of valve size vs. lift at "XX" duration etc...) .017 for intake lift and 11* duration, and .014" for exhaust and 11* duration. Meaning if the events are identical sans the valve size, I would be in the clear by about .001 intake side (this is the closest of any right???) And under by .002 for the exhaust.
Basically I would love to bolt on some heads, without smacking my valves, before I deploy just to see if my theory is right about my cars lack luster track performance being related to the crappy factory #853 casting heads and I dont have a Isky Piston notcher available.
I would be so relieved if someone using this cam had milled heads, and measured their clearance. Thanks.
Charlie.
tsp 231 / 237 .591/.598 @ 112*
TR 242 / 248 .608/.612 @ 110+2*
TR TRx makes life in stock engine, heads etc....with .070 clearance.
My heads 2.02/1.60 valves, milled .022
Stock gaskets are .052" compressed, gaskets to be used are .060" compressed.
Not sure the dynamic relationship behind the valve events, I have read until my eyes bleed and still have a hard time digesting the whole relationship.
Here goes:
Use -.022 milled heads, add .008 from gaskets equals -.016. Difference in cam (not sure of events as stated for relationship of valve size vs. lift at "XX" duration etc...) .017 for intake lift and 11* duration, and .014" for exhaust and 11* duration. Meaning if the events are identical sans the valve size, I would be in the clear by about .001 intake side (this is the closest of any right???) And under by .002 for the exhaust.
Basically I would love to bolt on some heads, without smacking my valves, before I deploy just to see if my theory is right about my cars lack luster track performance being related to the crappy factory #853 casting heads and I dont have a Isky Piston notcher available.
I would be so relieved if someone using this cam had milled heads, and measured their clearance. Thanks.
Charlie.
TECH Enthusiast
Joined: Nov 2002
Posts: 593
Likes: 1
From: Chicago Heights, IL
Theres really no way to tell for sure unless you measure it, but what you can do, is take a cam you know does clear, and then custom design a cam with similar intake opening and exhaust closing events, and just increase duration and lope separation.
For example:
I currently have heads milled .020" with stock gaskets. I am running a 228/224 112 +2 LSA cam. Through messing with a VE calculator, I came up that a 232/236 115 +3 LSA cam would have the same intake valve opening event, and 2 degrees later exhaust valve closing.
In theory, this cam should work well with my heads, make more power, and have no piston to valve clearance problems.
For example:
I currently have heads milled .020" with stock gaskets. I am running a 228/224 112 +2 LSA cam. Through messing with a VE calculator, I came up that a 232/236 115 +3 LSA cam would have the same intake valve opening event, and 2 degrees later exhaust valve closing.
In theory, this cam should work well with my heads, make more power, and have no piston to valve clearance problems.
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From: Sierra Vista, AZ
This is exactly what I didnt want to hear, but was prepared to hear. Really sucks, cause there is no way in hell I am pulling this off and not putting the heads on, and I dont have the time to wait for some new heads. Ughh. Guess it will be a project for summer 2005! Vacation in Afghanistan here I come.
I think the 231.237 will probably clear, we have run it on around 12 thou off heads, but I always like guys to check just to be sure 
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Thread Starter
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Joined: Sep 2002
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From: Sierra Vista, AZ
Jason theres only one way I would check this puppy out, install and turn til it clears, or stops. May sound a tad assclownery but I really would cry myself to sleep if I pulled them, measure and need to clearance only to install stock heads again. I know I could go thiker gaskets, but thats a crutch I am not willing to walk on seeing how the car is nitrous addict.
