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daily " guess my HP" thread.

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I have a 1998 crate 5.7 vortec laying around. Its the version with 4 bolt mains and hardened exhaust seats. It has 25,000 miles on it when I pulled it and was thinking about putting it in my moms 1980 vette ( 4 speed car) after a rebuild. I bought the engine new for my truck but it was totaled so I pulled the motor back out

It was going to be stock except for headers an edelbock dual plane, 600 cfm carb. and the gm hot cam ( listed below)
it was factory rated at 255 /330 hp/ torgue. Do you think it wil hit 300 HP?


Intake Duration at 050 inch Lift:
196
Exhaust Duration at 050 inch Lift:
206
Duration at 050 inch Lift:
196 int./206 exh.
Advertised Intake Duration:
288
Advertised Exhaust Duration:
308
Advertised Duration:
288 int./308 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.431 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.451 in.
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I have a 1998 crate 5.7 vortec laying around. Its the version with 4 bolt mains and hardened exhaust seats. It has 25,000 miles on it when I pulled it and was thinking about putting it in my moms 1980 vette ( 4 speed car) after a rebuild. I bought the engine new for my truck but it was totaled so I pulled the motor back out

It was going to be stock except for headers an edelbock dual plane, 600 cfm carb. and the gm hot cam ( listed below)
it was factory rated at 255 /330 hp/ torgue. Do you think it wil hit 300 HP?


Intake Duration at 050 inch Lift:
196
Exhaust Duration at 050 inch Lift:
206
Duration at 050 inch Lift:
196 int./206 exh.
Advertised Intake Duration:
288
Advertised Exhaust Duration:
308
Advertised Duration:
288 int./308 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.431 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.451 in.
I had one of those Vortec 5.7 stock like yours in my street car and went to a RW Dyno test for a benefit for a friend. With my 600 Holley vs, RPM performer and a set of headers I laid down 231RWHP with it running a turbo 400. The dyno operator said that was pretty good considering the A/F ratio was 10.7 pig rich, he said leaned out it would have gone 250 at the wheels. Pretty good for a bone stock engine. Vortec bolt on parts only will go 300hp on an engine dyno IMO. I plan to toss that engine in my car again go to the track and put Vortec in the high 12's, it's already run 13.07 with a little better tuning and my Frankencarb 600 it will hit the 12's pretty easy.
 

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745 Posts
GM Hot cam...


ntake Duration at 050 inch Lift:
218
Exhaust Duration at 050 inch Lift:
228
Duration at 050 inch Lift:
218 int./228 exh.
Advertised Intake Duration:
279
Advertised Exhaust Duration:
287
Advertised Duration:
279 int./287 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.492 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.492 in.
 

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4,403 Posts
If you want to build/modify a mellow 350 today, it's hard to beat a Hot Cam and Vortec Heads......that have the machine work necessary for a cam like that.
 

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I will agree with the combo. Vortec with the proper spring and a set of 1.6 rockers will put the Gm Hot Cam at .525 lift. I have always cut the valve seals with Comp Cams tool and installed the .531 size valve seal. Then a set of Comp Cam valve springs pn.26981 and there small retainers and the stock locks. Springs will handle the .525 lift with the Hot Cam with the 1.6 rockers. Spin that one up to 6200 all day long. Stock bottom end and a shim head gasket to up the compression a little and your set. A lot of articals will say your getting up to the 400/400 on hp and tq.
 

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I have a 10:1 355 in my 65 Impala, with EQ heads (a Vortec copy) and a Lunati hydraulic roller with specs very close to the GM Hot cam. The Lunati is 219/227 @ .050.

Even without headers (using the factory 2.5" rams horn manifolds), a 3.42 gear, and a TH400, it runs 13.80's @ 100 mph in the 1/4 mile. The Impala weighs over 4000 lbs with me on board, so this is certainly over 300hp.
 

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I have a 10:1 355 in my 65 Impala, with EQ heads (a Vortec copy) and a Lunati hydraulic roller with specs very close to the GM Hot cam. The Lunati is 219/227 @ .050.

Even without headers (using the factory 2.5" rams horn manifolds), a 3.42 gear, and a TH400, it runs 13.80's @ 100 mph in the 1/4 mile. The Impala weighs over 4000 lbs with me on board, so this is certainly over 300hp.
Interestingly enough, I had this same cam in my 350 but with E-Tec 170 heads.
The used short block had bad rings....as I eventually found out.
But with the other stuff in my signature, I went 12.9x @ 105-108 (can't remember without looking it up but I have the slips and video somewhere.)
Great mellow combo that was a lot of fun.
 
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