400 bhp?
Drifting
Joined: May 2005
Posts: 1,370
Likes: 1
From: Raleigh NC
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Yes, the lt4 heads are equipped with aluminum comp cam roller rockers with beehive springs and are angled valves. The heads produce a 10.8/1 cr. The sae advertised hp is 330. Some say it's more like 345, but that's all conjecture. So I'm really only looking for 70-80 ponies.[/QUOTE]
Yes, you are only looking for about 70 addditional horsepower.
Using the $50/hp rule of thumb, you need to budget about $3500 for this exercise.
Larry
code5coupe
Yes, you are only looking for about 70 addditional horsepower.
Using the $50/hp rule of thumb, you need to budget about $3500 for this exercise.
Larry
code5coupe
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
1)The factory LT4 rockers were made by Crane...
2)The factory valve springs were oval (vs round on LT1), I don't think beehive springs even existed in 1996..
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Thread Starter
Le Mans Master
Joined: Dec 2006
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From: H-Town Texas
Of course, you're right. This is why I love this forum, I always get to learn. So long as I know a little more today then I knew yesterday, I am headed in the right direction. Thank you!
Racer
Joined: Apr 2003
Posts: 342
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From: Kalamazoo MI
Most of the info you need is already out there. You could easily sink $2k into portwork on your heads, which you will need if you want 400HP at the wheels. Add the LT4 hotcam with a tune and you're close, but you need a little more aggressive cam. 1.7 rockers with a hotcam can squeeze a little extra. CF user Nathan Plemons ran this combo.
I would not do the 160 t-stat. Go no lower than 180 or you will get excessive engine wear and you want to cook all moisture out of your oil. Get a tune to turn your fans on earlier or invest in an aluminum radiator if you're worried about cooling.
Ford SVO 24# or LS1 injectors are a good alternative to OEM gear. Again invest in a tune, PCMforless is a mail order shop with a good reputation, but you really want a dyno tune.
I would not do the 160 t-stat. Go no lower than 180 or you will get excessive engine wear and you want to cook all moisture out of your oil. Get a tune to turn your fans on earlier or invest in an aluminum radiator if you're worried about cooling.
Ford SVO 24# or LS1 injectors are a good alternative to OEM gear. Again invest in a tune, PCMforless is a mail order shop with a good reputation, but you really want a dyno tune.
