550HP 396 LT4 with Questions??
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Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: 550HP 396 LT4 with Questions??
Originally Posted by T/A KID
Well with a Final compression ratio of right at a 11.1 I should be able to run a 91+ octane at the pumps (I always run 93 anyways) but your right about the Dynamic compression ratio. 600 is quite a feat but I think I can get 550. It all depends on how well the AFR cylinder heads do with porting I suppose. I wish FAST made a LT4 intake. Funny thing is my Friend is one of the main guys in the Fast Department at COMP. I was over his house this last weekend and he had a 90MM Fast plastic intake manifold, wanting to put on my Brothers LS1 SS. I want to shut up the LS1's (for the most part, lol) 
With a static of 11-1 ya are going to be in the low 8's with DCR unless it's a tiny cam and either don't help make HP. Ya might want to check into that one because it needs to be up there to make the HP.Ya can run 9.0 on 92 all day long with good cooling,even run the air.
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Joined: Oct 2002
Posts: 969
From: Arkansas
Re: 550HP 396 LT4 with Questions??
Well I don't want to really get away from our standard LT4 intake under Fuel injection, (daily driver). I just wish someone had a Lt4 intake that could keep up with the heads well enough. I have heard of the Vic JR intakes but that is all going into a direction I don't want to take. Someone on here makes what they call a LTX intake manifold with much detailed work and they sell it for a hefty 1500, and the rumor is it only starts to make more power past 7,000. I believe however 20+ hp could be made if our intakes flowed better. Thats where the LS1 gets there edge along with there 15 degree heads.
The Camshaft selection is going to be the pitty, I am very eager to see what the guys at comp come up with.
The Camshaft selection is going to be the pitty, I am very eager to see what the guys at comp come up with.
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: 550HP 396 LT4 with Questions??
Originally Posted by T/A KID
Well I don't want to really get away from our standard LT4 intake under Fuel injection, (daily driver). I just wish someone had a Lt4 intake that could keep up with the heads well enough. I have heard of the Vic JR intakes but that is all going into a direction I don't want to take. Someone on here makes what they call a LTX intake manifold with much detailed work and they sell it for a hefty 1500, and the rumor is it only starts to make more power past 7,000. I believe however 20+ hp could be made if our intakes flowed better. Thats where the LS1 gets there edge along with there 15 degree heads.
The Camshaft selection is going to be the pitty, I am very eager to see what the guys at comp come up with.
The Camshaft selection is going to be the pitty, I am very eager to see what the guys at comp come up with.
Thread Starter
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Joined: Oct 2002
Posts: 969
From: Arkansas
Re: 550HP 396 LT4 with Questions??
Really, do you have any links to this intake. Is it commonly done, any draw backs. Yea I have heard the Runner length hurts the Lt1 and Lt4 guys. I believe we are going with the Monoblade over the 58MM. I have heard the Monoblade has the missing part in the middle ( I suppose its like a oval LS1 induction) I believe the Monoblade flow 1300 if I am not mistaken
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Re: 550HP 396 LT4 with Questions??
Originally Posted by T/A KID
Golen engine services (In this months GM-highTech) are selling some very nice 383 and 396 Forged Shortblocks for $3,499.00 Heres the link
http://www.golensengineservice.com/
Along with selling the Shortblocks they sell Long blocks as well for great prices.
I am looking into the 396 Competition shortblock, I know I need enough air to supply the cylinders to make enough power with the Extra cubes. I have a set of AFR 195 Lt4 heads setting here and I have talked to LE about porting them and my LT4 intake. The heads come stock with a 2.02 intake valve and we are upgrading to a 2.05 for the extra flow potential. I am not wanting to To FLOW RACE (thats what I usually call it when people rave about max flow) but to concentrate on making awsome mid range numbers and probably max out around 290ish CFM at .600 lift. I believe the most important flow is between .400 and .600 lift. I would not even think about going with a 396 without some proted AFR heads. I believe most people go with 355's and 383's because of head flow and USUALLY I suppose the cost.
I live in Northeast Arkansas about a hour and half from COMPCAMS, and I have 2 really good friends who work there, (one actually works in the FAST Department) and they are wanting to build the custom cam for my 396 and run some BEEHIVE SPRINGS
on a Hyd Camshaft. I am kinda of scared of them making to big of a cam though. I don't want to run into PTV clearence issues and I have always heard the better the heads the least the cam size has to be. I know the main power is made in the Heads, cam, intake, and valvetrain. I just want my 396 to be very street friendly, BTW its a A4 3:73's with a 3000 stall probably going to upgrade to a 3500 and 3:42's. I think with a 396 I really don't need the 3:73's anymore and I will get slightly better fuel economy and still have all the power I need.
I am hoping to achieve around 530-550 Flywheel and about 450RWHP. I am almost certain I can achieve that. Golen actually sells a 396 LT4 Longblock with this setup
http://www.golensengineservice.com/
Along with selling the Shortblocks they sell Long blocks as well for great prices.
I am looking into the 396 Competition shortblock, I know I need enough air to supply the cylinders to make enough power with the Extra cubes. I have a set of AFR 195 Lt4 heads setting here and I have talked to LE about porting them and my LT4 intake. The heads come stock with a 2.02 intake valve and we are upgrading to a 2.05 for the extra flow potential. I am not wanting to To FLOW RACE (thats what I usually call it when people rave about max flow) but to concentrate on making awsome mid range numbers and probably max out around 290ish CFM at .600 lift. I believe the most important flow is between .400 and .600 lift. I would not even think about going with a 396 without some proted AFR heads. I believe most people go with 355's and 383's because of head flow and USUALLY I suppose the cost.
I live in Northeast Arkansas about a hour and half from COMPCAMS, and I have 2 really good friends who work there, (one actually works in the FAST Department) and they are wanting to build the custom cam for my 396 and run some BEEHIVE SPRINGS
on a Hyd Camshaft. I am kinda of scared of them making to big of a cam though. I don't want to run into PTV clearence issues and I have always heard the better the heads the least the cam size has to be. I know the main power is made in the Heads, cam, intake, and valvetrain. I just want my 396 to be very street friendly, BTW its a A4 3:73's with a 3000 stall probably going to upgrade to a 3500 and 3:42's. I think with a 396 I really don't need the 3:73's anymore and I will get slightly better fuel economy and still have all the power I need.I am hoping to achieve around 530-550 Flywheel and about 450RWHP. I am almost certain I can achieve that. Golen actually sells a 396 LT4 Longblock with this setup
check the forsale section. I have what you need
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Joined: Oct 2002
Posts: 969
From: Arkansas
Re: 550HP 396 LT4 with Questions??
I have looked for the Intake you are referring too and I can not find it for the life of me,
Also can anyone explain to me why camshafts that are radical in a 350 are calm in a stroker motor, say a 383 or 396?????
I suppose when the heads get done, camshaft selection will be made. Based on that will depend on RPM's
Also can anyone explain to me why camshafts that are radical in a 350 are calm in a stroker motor, say a 383 or 396?????
I suppose when the heads get done, camshaft selection will be made. Based on that will depend on RPM's
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Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: 550HP 396 LT4 with Questions??
Originally Posted by T/A KID
I have looked for the Intake you are referring too and I can not find it for the life of me,
Also can anyone explain to me why camshafts that are radical in a 350 are calm in a stroker motor, say a 383 or 396?????
I suppose when the heads get done, camshaft selection will be made. Based on that will depend on RPM's
Also can anyone explain to me why camshafts that are radical in a 350 are calm in a stroker motor, say a 383 or 396?????
I suppose when the heads get done, camshaft selection will be made. Based on that will depend on RPM's
It's a Holley Stealth Ram it is NOT for the LT-1 but all ya gotta do is rebrill the bolt pattern to what your heads have.
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Joined: Oct 2002
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Re: 550HP 396 LT4 with Questions??
Which one?
Gas mileage with a 550hp stroker ain't much of a concern IMHO..... the one I'm working on in the shop... well that will be about as good as it gets for a 600hp motor. 396 cubes are thristy and any amount of overlap is gonna hurt the mileage. Luckily the customer has a small stall and a 3.23 gear so it should be decent for the power.
Bret
Gas mileage with a 550hp stroker ain't much of a concern IMHO..... the one I'm working on in the shop... well that will be about as good as it gets for a 600hp motor. 396 cubes are thristy and any amount of overlap is gonna hurt the mileage. Luckily the customer has a small stall and a 3.23 gear so it should be decent for the power.
Bret
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Joined: Oct 2002
Posts: 6,518
Re: 550HP 396 LT4 with Questions??
BTW here was that thread on the intake....
http://web.camaross.com/forums/showt...&highlight=HSR
Bret
http://web.camaross.com/forums/showt...&highlight=HSR
Bret
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Posts: 969
From: Arkansas
Re: 550HP 396 LT4 with Questions??
I would think mileage would all depend on how the car was driven. OF course we all now more RPM's equals more fuel. I believe with a relatively high gear like a 3:23 or 3:42 gear ratio in a auto with a 3,000 or less stall under normal STREET driving. A 396 with a High flowing head (290+CFM and a moderate size camshaft (street friendly). A car in my opinion would see say in the high teens (17-19) per gallon.
What would you guys say.
What would you guys say.
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