I bought the LT4 Hot Cam and I am in the process of installing it. With the 1.52:1 rocker arms on my car now, the valve lift with be .498" the stock springs are good to .500" since its so close, should I get new springs? If I do, what will a machine shop charge me to install them? I have no idea how do to it. Thanks a lot!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

Stock springs are terrible. I'd replace those and do the valve seals while I was at it. Are the heads off the car? Shouldnt cost much to just swap out some springs if they are, its a fairly simple job with the right tools.

 

i'm with max, i'd replace the springs

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ICON Motorsports

1st & 3rd

 

Absolutely.

Get Comp 981s, I'd trust them more than I would the GMPP ones.

There are several ways to do springs with the heads on the car. Since you're already swapping the cam you're already about 90% of the way there. You can do it with a bar-type or a screw-type (not a C-clamp type) spring compressor, and either an air chuck or some rope.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Don't forget to do the valve seals at the same time. Using the recommended valve springs is always a good idea. If the heads are still original, those valve springs are 14 years old and should be changed anyway.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block almost ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

yes! always match your springs to the cam so you dont have the wrong ones stock are crap like the others said always get matching springs ! what are the specs for that cam??? who makes it (comp or crane ) one of the 2 always make cams in the end! that cam does sound really tempting to me just wondering waht the cam is??

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 and a 600 edlebrock manual choke.

Future mods performer rpm air gap intake (polished) comp roller cam, and way better headsa 400 defintely in the works!

 

The LT4 Hot Cam is made by GM Performance Parts. The specs are duration @ .050" 218/228 with 1.5:1 lift of .492/.492.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!