C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Trick Flow top end kits

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Old Sep 22, 2011 | 07:58 PM
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Default Trick Flow top end kits

Anyone have any experience with the Trick Flow top end kits? I like the matched package deal, and have heard good things about their heads and kits. My only concern is that the 420hp kit may have too rough of an idle, and it's hard to buy the 350hp kit for $100 less... I prefer if my Vette sounds like a Vette and not an old muscle car with a rough idle.

Is there any chance that I'll even get the rated HP from these kits if I keep my CFI setup have it ported with a larger tb?

Maybe there's a better way to make 400hp? But to me $1800 is affordable to get 420hp.
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Old Sep 22, 2011 | 08:51 PM
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talk to Lloyd Elliot from Elliot's Port Works, I went with his LE2 heads and biggest emissions cam he offers and couldn't be happier. I haven't had it on a dyno yet but he said it should make ~400rwhp with all the supporting mods. Lloyd is a great guy and very helpful

EDIT: just noticed your car is an '84, Ive heard Lloyd will do port work on the older motors but I don't think he has any packages available like he does for the LTx motors

Last edited by RustInPeace; Sep 22, 2011 at 09:07 PM.
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Old Sep 22, 2011 | 09:05 PM
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Do some research on the crossfire intakes. It will help you decide on the top end.
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Old Sep 22, 2011 | 09:11 PM
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Originally Posted by twps
Is there any chance that I'll even get the rated HP from these kits if I keep my CFI setup have it ported with a larger tb?
Doubtful
Better investment would be new CFI intake and your choices are very limited.

Originally Posted by twps
Maybe there's a better way to make 400hp? But to me $1800 is affordable to get 420hp.
I will risk saying ; a carb swap
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Old Sep 22, 2011 | 09:16 PM
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I will risk saying ; a carb swap
You'd better be hiding under that chair. A carb swap. Sheesh, why would anyone want to go from electronic fuel injection to a semi-regulated gas leak. I believe that's all a carb is and I grew up with them. At least you could have suggested a single plane (or dual plane) and a 4150 style throttle body. A carb swap.....indeed.
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Old Sep 22, 2011 | 09:23 PM
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I like the uniqueness of the CFI... I know it's not the most desired setup out there, but I do believe that with proper porting and tuning it can make some power and still look stock when the hood is open.
Maybe a TPI in the future, but I'm going to stick with the CFI for now.
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Old Sep 22, 2011 | 09:25 PM
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Thanks, RIP. Lloyd's options look good and the prices are good. I'll reach out to see it he can help me out. I'm assuming this is all based on the newer LT motors.
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Old Sep 22, 2011 | 11:32 PM
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Do a little thread searching on the Xfire. There are a couple of very knowledgeable guys on the board here (Rod is one of them). 350-400hp with the Xfire... good luck. prob 1, intake sucks, search "porting xfire". prob 2 cam is amazingly tiny Im surprised the thing runs at all. prob 3 the computer cant be tuned to run a cam with any meaningful specs. prob 4 the heads are junk, they are way too heavy and have embarrassingly poor flow specs. The throttle bodys flow surprisingly well.

The cheapest simplest way to the hp numbers you mentioned is a HP 650 and a top end kit w/ cam and headers. You could pic any of a half dozen FI kits that will work great it will cost about 1000$ more.
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Old Sep 22, 2011 | 11:38 PM
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oops I almost forgot...LET THE FLAMES BEGIN!
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Old Sep 22, 2011 | 11:46 PM
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Originally Posted by 1963SS
Sheesh, why would anyone want to go from electronic fuel injection to a semi-regulated gas leak.
Because as Crepitus notes ; everything else in the CFI is cr*p and hard work to get OP's aims of 400Hp .

Originally Posted by 1963SS
At least you could have suggested a single plane (or dual plane) and a 4150 style throttle body
A upgrade to MPFI will require a different ECM and wiring =$$$

Originally Posted by twps
but I do believe that with proper porting
Start grinding
http://users.swko.net/~lionsden/crossfire.htm
http://www.technovelocity.com/chevyh...rt_polish.html

Originally Posted by twps
it can make some power .
http://www.digitalcorvettes.com/foru...6&postcount=12
http://www.digitalcorvettes.com/foru...6&postcount=16
http://www.digitalcorvettes.com/foru...25&postcount=2

Last edited by rodj; Sep 23, 2011 at 12:01 AM.
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Old Sep 23, 2011 | 08:08 AM
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So I understand there are limitations with the CFI setup, I'm not too concerned with right now. I'd like to change out the cam and heads and was looking at the Trick Flow top end kit packages 350 & 420 HP kits. I guess what I'm hearing is I'm better off to buy the 350HP kit, as the 420HP won't likely unless I replace the CFI system.

Does anyone have experience with the Trick Flow kits, do they make the claimed power, and are the worth the money?
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Old Sep 23, 2011 | 09:30 AM
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Originally Posted by twps
So I understand there are limitations with the CFI setup, I'm not too concerned with right now. I'd like to change out the cam and heads and was looking at the Trick Flow top end kit packages 350 & 420 HP kits. I guess what I'm hearing is I'm better off to buy the 350HP kit, as the 420HP won't likely unless I replace the CFI system.

Does anyone have experience with the Trick Flow kits, do they make the claimed power, and are the worth the money?
The kits WILL make the power we claim as long as the parts we suggest are used with them. For example the 420 HP kit is based off of a 350 with flat tops with the 64cc head giving you about 10.0:1 compression. Used with a Edelbrock Vic. Jr. intake and a 750 Holley. With that combination you will make the 420 HP at the crank we claim.
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