What length pushrods for cam swap?

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Dec 3, 2006 | 03:39 AM

TA1972

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What length pushrods for cam swap?

Hi, I want to put this custom grind cam into my 99 LS1 TA. I'm going to use my stock heads,but i'm putting the LS6 springs using my stock rockers. What length should I get for this cam using my stock heads? What kind of hp at the wheels can get out of this cam& ls6 springs? Heres the specs for the cam:Grind Number# HR-279-CSB

Valve Setting:

IN./Hyd.

EX./Hyd.

RPM Operating Range:

1800 to 6600

Duration:

Advertised IN./.275 EX./.287

@.050" IN./218 EX./228

Valve Lift:

1.7 Rocker: IN./.558 EX./.558

Sprins: LS6 or equivalent

Lobe Sep. Angle:

IN./116

EX./116

Dec 3, 2006 | 07:20 AM

PREDATOR-Z

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From: BFE

I would use the 918 springs or 04 LS6, 7.400 pushrods

Dec 3, 2006 | 08:25 AM

GuitsBoy

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it says to use LS6 springs? I wouldnt think those would be enough...

Pred, whats the difference with '04 LS6 springs? I assume higher pressures, but by how much?

Dec 3, 2006 | 08:34 AM

PREDATOR-Z

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From: BFE

They are the same as 02 (yellow or green) and 03+ (Orange) seat 90 and open 294. just that it is the latest version, supposed to have a little better alloy.

Dec 3, 2006 | 03:26 PM

TA1972

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Quote:

Originally Posted by PREDATOR-Z

I would use the 918 springs or 04 LS6, 7.400 pushrods

HI, So I could use stock pushrod length(7.400),using this cam ? Wouldn't that be smaller,because I'm using my 99 ls1 stock heads and vavles but changing out the stock spring and using 03 ls6 springs for this custom grind cam setup? I heard that some people went .25 longer. Is this true,or can i just use the stock length(7.400) ?

Dec 3, 2006 | 04:06 PM

Lurius

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ls6 springs are good for .550 lift I believe, i'd go with 918's.

-Lurius

Dec 3, 2006 | 04:16 PM

Grimes

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I'm going to go out on a limb here and suggest you get the thunder racing 224/224-114 cam and go with 918 springs. It's such a proven cam, and very close to what you have already. As for pusrods, some ppl like to use 7.425 pusrods to make up for the smaller base circle of a aftermarket cam. Good luck with whatever you do.