Dyno results AFR 205s with BIG cam
02-06-2005, 09:06 PM
#21
Originally Posted by Lady Redhawk
Not sure what the deck height is, believe it is .015 higher than stock. They are the 66cc and the deck is 3/4 thicker than stock. He only had .048 clearance with the stock heads 
And they say he should have .052 clearance now even with the .040 gaskets. I am trying to remember what all the cam specs are, but I think ICL is 110 and 111LSA.
And they say he should have .052 clearance now even with the .040 gaskets. I am trying to remember what all the cam specs are, but I think ICL is 110 and 111LSA.
, dont miss a shift. deck height refers to how high the pistons come out of the block, GM specs are -.008 out the hole, but the range is .002 - .010. are you saying yours are .015 out the hole or are you refering to the extra clearance the AFR heads have due to there thicker deck? 
02-06-2005, 09:09 PM
#22
Originally Posted by Lady Redhawk
They are the 66cc and the deck is 3/4 thicker than stock. He only had .048 clearance with the stock heads And they say he should have .052 clearance now even with the .040 gaskets.
And they say he should have .052 clearance now even with the .040 gaskets.Shawn
02-06-2005, 09:10 PM
#23
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Originally Posted by jrp
holy **** that close , dont miss a shift. deck height refers to how high the pistons come out of the block, GM specs are -.008 out the hole, but the range is .002 - .010. are you saying yours are .015 out the hole or are you refering to the extra clearance the AFR heads have due to there thicker deck?
, dont miss a shift. deck height refers to how high the pistons come out of the block, GM specs are -.008 out the hole, but the range is .002 - .010. are you saying yours are .015 out the hole or are you refering to the extra clearance the AFR heads have due to there thicker deck?
02-06-2005, 09:15 PM
#24
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I believe the TRex has less p to V clearance than that....033 on stock heads? Is that right?
02-06-2005, 09:22 PM
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Originally Posted by SPANKY LS1
TreX has ~.070 IIRC.
p to v clearance.
02-06-2005, 09:27 PM
#27
From this thread....
SPECS
Thunder Racing TRx V.2 - 242/248 .608/.612 110lsa +2
Piston to Valve clearance
When going with a cam of this size, piston to valve clearance becomes more of a concern. Both of these cams are well within the spec of allowable clearance with stock heads and stock shortblock. They are, however, on the tight side of the spec, but definitely something that can be used with the proper attention being paid to the install (intake centerline) and valvetrain selection.
The cams have the following PtV with a stock cylinder head (stock valves, stock valvejob, no milling), '98/'99 GM graphite gasket (.053", compressed), stock shortblock (pistons .007" above deck), and a 108* intake centerline:
Intake .070", Exhaust .090"
For those that feel that this is too tight and are uncomfortable with this clearance, we do offer the ISKY flycutting tool which will make valve reliefs in your stock pistons. The heads do need to be removed to perform this task, so be prepared to purchase new gaskets and bolts. You can notch the pistons with the motor still in the car. You can also just select a smaller camshaft and not have to worry about any of this.
The pistons in my car are not notched and I have had no problems with any PtV.
Jason
Originally Posted by Jason99T/A
SPECS
Thunder Racing TRx V.2 - 242/248 .608/.612 110lsa +2
Piston to Valve clearance
When going with a cam of this size, piston to valve clearance becomes more of a concern. Both of these cams are well within the spec of allowable clearance with stock heads and stock shortblock. They are, however, on the tight side of the spec, but definitely something that can be used with the proper attention being paid to the install (intake centerline) and valvetrain selection.
The cams have the following PtV with a stock cylinder head (stock valves, stock valvejob, no milling), '98/'99 GM graphite gasket (.053", compressed), stock shortblock (pistons .007" above deck), and a 108* intake centerline:
Intake .070", Exhaust .090"
For those that feel that this is too tight and are uncomfortable with this clearance, we do offer the ISKY flycutting tool which will make valve reliefs in your stock pistons. The heads do need to be removed to perform this task, so be prepared to purchase new gaskets and bolts. You can notch the pistons with the motor still in the car. You can also just select a smaller camshaft and not have to worry about any of this.
The pistons in my car are not notched and I have had no problems with any PtV.
Jason
02-06-2005, 09:37 PM
#28
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Originally Posted by SPANKY LS1
From this thread....
02-06-2005, 10:30 PM
#29
Originally Posted by Lady Redhawk
Yes, I remember reading that when it came out. That is why I was surprised with the claying results from Combination. I was wondering if anyone else had clayed one.
Put it this way.I ran a 236 intake lobe with a .600 lift in a car with LS6 heads shaved .030 and a .045 gasket (stock shortblock with no valve reliefs).The tightest P/V clearance was .125 which is alot but the Cam had timing in it so it opened up the clearance.Thats why it is hard to say a Cam will fit a certain application without checking P/V first.
02-06-2005, 11:13 PM
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Valve event are timed from grinding the cam, after its ground non-adjustable. Cam Timing from degreeing it during install and is only adjustable by keyways (or similar design) advance when ALL the events take place or retarding them and must have an adjustable timing set. And Ignition timing is the point in relationship to piston TDC that the spark reachs the plug causing combustion, adjust in degrees (*) during tuning for different condtions, crank, idle, cruise, WOT etc.
