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Old 02-14-2019, 10:59 PM   #1
sinisterlsx510
 
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anyone one running the tsp4.2 with great success?

purchased the cam over like 6 or 7months ago and piecing my valve train piece by piece.. and I'm stumped on the pushrod length and also wanting to see what kinda of numbers people laid down.. i have some 7.350 laying around from my previous 408 maybe i can reuse,,..so im just curious to see if anyone has an idea .. the specs are
235/247, .649"/.629", 113 LSA
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Old 02-15-2019, 01:21 AM   #2
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I daily mine and its cut on a 111*
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Old 02-15-2019, 07:52 AM   #3
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p/r length based on lobe height...on a otherwise stock motor your lookin at 7.450 most likely...HOWEVER you should always get a p/r checker....any mods to the head or different gaskets will require new calculations...and aftermarket lifters have diff specs too.


good luck!


peace
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Old 03-20-2019, 06:33 AM   #4
weSS1LEy
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Jebus thatís a big cam!
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Old 03-20-2019, 07:47 AM   #5
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That cam with a solid bolt on set up around it, should go well over 520rwhp.
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Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE
Best MPH 132
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Old 03-20-2019, 01:51 PM   #6
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Quote:
Originally Posted by frankwjr View Post
p/r length based on lobe height...on a otherwise stock motor your lookin at 7.450 most likely...HOWEVER you should always get a p/r checker....any mods to the head or different gaskets will require new calculations...and aftermarket lifters have diff specs too.


good luck!


peace
I agree with Frank. You are probably looking at 7.45 or 7.425. The base circle of a cam that big probably means a smaller base circle. Also like Frank said, you should use a pushrod checker to be sure. They are cheap and will give you peace of mind. Give TSP a call to get you started in the right direction too. They advised me to try 7.4 on my stage 2 cam and when I checked it was spot on. They also said, they do a no questions asked swap of a different length if you find out they are the wrong length when you order. The other thing to think about is that companies measure the length a little differently so not all 7.425s are the same length. I compared my stock 7.4s to the hardened 7.4s from TSP and the TSP PRs were a little longer than stock.
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Old 03-20-2019, 03:22 PM   #7
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Quote:
Originally Posted by PepeLePew View Post
I agree with Frank. You are probably looking at 7.45 or 7.425. The base circle of a cam that big probably means a smaller base circle. Also like Frank said, you should use a pushrod checker to be sure. They are cheap and will give you peace of mind. Give TSP a call to get you started in the right direction too. They advised me to try 7.4 on my stage 2 cam and when I checked it was spot on. They also said, they do a no questions asked swap of a different length if you find out they are the wrong length when you order. The other thing to think about is that companies measure the length a little differently so not all 7.425s are the same length. I compared my stock 7.4s to the hardened 7.4s from TSP and the TSP PRs were a little longer than stock.
Depending on how particular you are to lifter preload, you may also want 2 different sizes for intake and exhaust. My set up i used 4 different sizes (shimmed rockers) and spent the time to set preload with in .008 across the board with the johnson short travels.
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Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE
Best MPH 132
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Old 03-20-2019, 11:33 PM   #8
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Quote:
Originally Posted by weSS1LEy View Post
Jebus thatís a big cam!
Thats what she said jaja jk.. yea man go big or go home... should be a nice setup with all the correct supporting mods
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2014 ss camaro
Stainless works long tubes , rotofab cai , vararam wedge , muffler delete,cat delete ,resonator delete , x pipe

2005 silverado 5.3
Long tubes, true dual bullets, aem intake , synergy tuned

2001 trans am
Lsx 408 ci rebuild in progress

1967 camaro
Sbc 327.
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Old 03-20-2019, 11:35 PM   #9
sinisterlsx510
 
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Quote:
Originally Posted by lazerlemonta View Post
Depending on how particular you are to lifter preload, you may also want 2 different sizes for intake and exhaust. My set up i used 4 different sizes (shimmed rockers) and spent the time to set preload with in .008 across the board with the johnson short travels.
Yea thats what i read places too that sometimes they diffur between exhausr/intake
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2014 ss camaro
Stainless works long tubes , rotofab cai , vararam wedge , muffler delete,cat delete ,resonator delete , x pipe

2005 silverado 5.3
Long tubes, true dual bullets, aem intake , synergy tuned

2001 trans am
Lsx 408 ci rebuild in progress

1967 camaro
Sbc 327.
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Old 03-20-2019, 11:44 PM   #10
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Originally Posted by sinisterlsx510 View Post
Should be a nice setup with all the correct supporting mods
+1 That is one big cam I hope you do all the required supporting mods and have a professional dyno tune done after installation. I wish you the best of luck with your installation.
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