TSP 5.3 heads; How to set up to acheive target DCR?
02-22-2007, 08:21 AM
#1
Staging Lane
Thread Starter
Join Date: Oct 2006
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
TSP 5.3 heads; How to set up to acheive target DCR? After months of researching, I have finally decided on a cam, and plan to buy Texas Speed's 224R head/cam package, with 5.3L heads. The cam specs out at 224/224 .581/.581 on a 112. I have no idea how to figure what the DCR for 5.3L heads is. From what I have read, a good DCR for a street car is around 8.5. How do I figure what DCR I'll have with this head off the shelf with a stock gasket? Should I use a Cometic gasket, or mill the heads? Any help would be greatly appreciated.
02-22-2007, 08:23 AM
#2
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
Use the DCR calculator that is in this forum that pianoprodigy made, search for it youll find it.
You should clay the engine first to find out how much you could possibly mill off the heads safely.
You should clay the engine first to find out how much you could possibly mill off the heads safely.
02-22-2007, 08:33 AM
#3
Staging Lane
Thread Starter
Join Date: Oct 2006
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by brad8266
Use the DCR calculator that is in this forum that pianoprodigy made, search for it youll find it.
You should clay the engine first to find out how much you could possibly mill off the heads safely.
You should clay the engine first to find out how much you could possibly mill off the heads safely.
02-22-2007, 08:43 AM
#4
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kilrb
I have used that calculator, but from what I have seen, it is only offered for LS1, LS6, and LS2 heads. I saw that there is a manual calculator... Is that what I should use? If so, I would have to find a few variables for the 5.3's, right? The deck height would be the same, I assume, so would the only variable I would have to change be the cylinder head chamber volume?
3.9 bore, 3.622 stroke, -.005 deck height, 63cc head chamber, and whatever gasket thickness you have.
02-22-2007, 08:55 AM
#5
Staging Lane
Thread Starter
Join Date: Oct 2006
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by brad8266
No its for LS1 6 2 engines, you can use any LSx head. Put in 62cc for your chamber volume. the deck height is the amount the piston is in/out of the block hole.
3.9 bore, 3.622 stroke, -.005 deck height, 63cc head chamber, and whatever gasket thickness you have.
3.9 bore, 3.622 stroke, -.005 deck height, 63cc head chamber, and whatever gasket thickness you have.
02-22-2007, 08:57 AM
#6
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
No the deck does not change, but the deck height is debateable and is not 100% the same in every engine the only way to truly know is to measure it using a dial indicator. Use -.005 or -.006, either way wont make a difference really. Oh and i measured my old stock gasket at .050.
Things will vary a few thousandth here and there but really wont make a measurable difference in anything anyway.
8.6 is fine for a street car running 93 octane.
Things will vary a few thousandth here and there but really wont make a measurable difference in anything anyway.
8.6 is fine for a street car running 93 octane.
02-22-2007, 10:41 AM
#7
Staging Lane
Thread Starter
Join Date: Oct 2006
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Now that I have covered DCR, is the quench ok for this setup with a stock gasket? Stock quench is 0.046-0.047. Is that ideal with a DCR of 8.63? If not, I don't see how to fix it, as going with a thinner gasket will bump the DCR up into the high 8's...
Trending Topics
02-22-2007, 10:46 AM
#8
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kilrb
Now that I have covered DCR, is the quench ok for this setup with a stock gasket? Stock quench is 0.046-0.047. Is that ideal with a DCR of 8.63? If not, I don't see how to fix it, as going with a thinner gasket will bump the DCR up into the high 8's...
02-22-2007, 10:52 AM
#9
Staging Lane
Thread Starter
Join Date: Oct 2006
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by brad8266
Tighter quench area helps out in higher compression applications due to the fact that tight quench will aid in reducing detonation. I wouldn not go any smaller than .040 gasket on a stock block due to the imperfections in mass production internals tolerances.
02-22-2007, 10:52 AM
#10
Tsp Says You Should Always Use The Gm Graphite Gaskets With The 5.3 L Heads.. You Cant Use The Other Ones Due To A Problem With Sealing On Those Heads(something About A Notch In The Head)
