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TR6 Any difference between 69 & 70 camshafts

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Got_All_4

Got_All_4

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I've got 2 cam shafts. 1 from a 69 and the other from a 70 TR6. Tried to find info on any differences but limited resources. Anyway I am planning to send these out for inspection/repairs and keep the original grind on one and a performance grind on the other. Haven't decided which one to use in my 69 rebuild but just want a mild upgrade in HP. Thoughts are using the original cam with an increase in rocker ratio using a roller rocker with 155:1 along with 9:1 compression, a mild port polish and port matching. Hoping to get 115 to 120 HP. Could switch and use the performance grind too which is going to be the sport 250 grind from Delta Camshaft. If not I'll save it for future back up if needed for the 6 or my TR250 witch already has the 250 sport in it.
 
Assuming that we are talking about the stock camshaft, there is no difference between the camshaft used in a 1969 or 1970 TR6. There were three different camshafts used during TR6 production. For the early carb TR6 (72 down) with the "narrow port" heads as well as the TR250 and GT6, there was the same very mild camshaft used. Early PI cars (150 HP), both TR5 and TR6, used a rather aggressive grind, relatively speaking. The later PI cars (125 HP) and later carb TR6 used the same camshaft with a grind that was the between the two earlier cams. All PI cars and the late carb cars used the wider port spacing heads but in different thicknesses depending on the compression ratio used in the specific engine configuration.
 
Yes we are talking about a stock camshaft. however the 250 performance grind is .
Dur int 250 Dur exh 254
int opens 17 closes 53
exh opens 60 closes 14
cam rise .255 L/C 108 deg
Lash int & Exh .014

I have this in my TR250 along with a lot of other machining and it is Fast! My mechanic said he thinks it's over 150hp and says there is more in there if I want him to work with the timing and advance. I just don't want to go that radical on a daily driver.
 
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