couple questions on my 398 lt1
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Joined: Jul 2003
Posts: 1,991
From: pa
Re: couple questions on my 398 lt1
I want a race car. i just need to get a idea of what to do from here i am going based on my budget so heads,computer,sheet metal intake are all in the plans but i would like to play while i save up also
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
Last edited by amean94ta; Jan 22, 2006 at 04:57 PM.
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Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: couple questions on my 398 lt1
Originally Posted by amean94ta
I want a race car. i just need to get a idea of what to do from here i am going based on my budget so heads,computer,sheet metal intake are all in the plans but i would like to play while i save up also
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
That's what was said earlier-- That ya didn't know or care about engines on paper ya were just looking for help for your set up.
With a larger cam your DCR will go down and so will your octane requirements. The cam will have to be spected according to your combo to be effective. Ya may not have the ultimate set up on paper but ya want it to run the best it can. I understand that and the budget thing.
Thread Starter
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Joined: Jul 2003
Posts: 1,991
From: pa
Re: couple questions on my 398 lt1
Originally Posted by 1racerdude
If ya got a DCR of 11.56 ya better run it on nuclear fuel...
DCR is what the engine actually "see's" and runs on.
Crower HIPPO or Isky Red Zone or Shubeck for a SBC,ask them.
Call your cam manufacturer and see what they offer in a 250/260@50 with a .400-.410 lobe lift= .656 lift on a 108+4. That may be more cam than ya want on the street,but she will run.
Probably have to get longer valves for spring seat pressure in the 225-250 range and 650-700 open pressure if ya are going to turn it 6500. Maybe a little less but not much.
Longer valves=longer PR's
Run stock heat range in the brand of choice with no exotic metal-- just standard plugs at .035 gap
Never ran SA rollers on a mech roller,but I wouldn't. Your lash will be HARD to set and because of the lash(.025-.030) I think they will come off of the stem in no time. BIG mess,lots of extra money to fix.
DCR is what the engine actually "see's" and runs on.
Crower HIPPO or Isky Red Zone or Shubeck for a SBC,ask them.
Call your cam manufacturer and see what they offer in a 250/260@50 with a .400-.410 lobe lift= .656 lift on a 108+4. That may be more cam than ya want on the street,but she will run.
Probably have to get longer valves for spring seat pressure in the 225-250 range and 650-700 open pressure if ya are going to turn it 6500. Maybe a little less but not much.
Longer valves=longer PR's
Run stock heat range in the brand of choice with no exotic metal-- just standard plugs at .035 gap
Never ran SA rollers on a mech roller,but I wouldn't. Your lash will be HARD to set and because of the lash(.025-.030) I think they will come off of the stem in no time. BIG mess,lots of extra money to fix.
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Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: couple questions on my 398 lt1
Originally Posted by amean94ta
so as of right now i am gonna go off these suggestions and see where it leads unless there might be something better you know of
Call Cam Motion or SStrokerAce or any cam company(more than one to compare) and see what they recommend.
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Posts: 1,991
From: pa
Re: couple questions on my 398 lt1
i am also going to have to think about piston to valve clerance huh? i know with the cc306 it was not a issue but i have flattops with a 0 decked block and 50cc heads????????
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Joined: Nov 2001
Posts: 2,985
From: In a house by the bay
Re: couple questions on my 398 lt1
Originally Posted by amean94ta
I want a race car. i just need to get a idea of what to do from here i am going based on my budget so heads,computer,sheet metal intake are all in the plans but i would like to play while i save up also
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
this year i did the 12 bolt, suspension, canton oilpan, lt headers and true duals with dumps before the axel and want to get a solid roller and rest of what i need to play this year and next winter worry about a computer/intake/heads
boy you guys got into soome stuff up there i dont even think i could understand lol
if i could still run 110 with a new cam it would be great cause i get it for $5.50 a gal and its readily avalible
In the meantime you can read up and try to understand what's been said. You'll be much better informed the next time you want to put something like this together. I'm not one to put words in your mouth and say that you don't WANT to understand these things... I leave all that to Larry, he's good at it.
BTW, I haven't bought your DCR calc yet. Can you tell me how you arrived at 11.6:1?
-Mindgame
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Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: couple questions on my 398 lt1
Originally Posted by amean94ta
i am also going to have to think about piston to valve clerance huh? i know with the cc306 it was not a issue but i have flattops with a 0 decked block and 50cc heads????????
Yea P/V clearance will need to be checked.
SStrokerAce has experience in building cams too he spects cams for the LE head and cam set ups and they do pretty good. Ya need to talk to different cam makers and see where the consensus lies for your combo.
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From: pa
Re: couple questions on my 398 lt1
i got my calculation here
did it and this what i came up with
ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) Cylinder Head Vol
(cubic in.) 03.050
Piston Head Volume (cc) Piston Head Vol
(cubic in.) 00.000
Gasket Thickness (in.) Swept Volume
(cubic in.) 49.673
Gasket Bore (in.) T.D.C. Volume
(cubic in.) 03.565
Cylinder Bore Diameter (in.) Gasket Volume
(cubic in.) 00.515
Deck Clearance (in.)
Note: Neg. nubmer above deck, Pos. number below deck Deck Volume
(cubic in.) 00.000
Stroke (in.) STATIC COMPRESSION RATIO 14.934
OPTIONAL DATA
Rod Length (in.) Adjusted Stroke (in.) 02.939
Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees DYNAMIC EFFECTIVE COMPRESSION RATIO 11.568
http://www.kb-silvolite.com/calc.php?action=comp
did it and this what i came up with
ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) Cylinder Head Vol
(cubic in.) 03.050
Piston Head Volume (cc) Piston Head Vol
(cubic in.) 00.000
Gasket Thickness (in.) Swept Volume
(cubic in.) 49.673
Gasket Bore (in.) T.D.C. Volume
(cubic in.) 03.565
Cylinder Bore Diameter (in.) Gasket Volume
(cubic in.) 00.515
Deck Clearance (in.)
Note: Neg. nubmer above deck, Pos. number below deck Deck Volume
(cubic in.) 00.000
Stroke (in.) STATIC COMPRESSION RATIO 14.934
OPTIONAL DATA
Rod Length (in.) Adjusted Stroke (in.) 02.939
Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees DYNAMIC EFFECTIVE COMPRESSION RATIO 11.568
http://www.kb-silvolite.com/calc.php?action=comp
