Thread: 1970 350 engine tuning

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I have a 1970 C-20 longhorn pickup with 350, the compression is 165. I have just installed cam/lifters, timing chain and heads. It also has a edelbrock performer rpm dual plane manifold, edelbrock perfomer carb 750 cfm and headers.

specs:
LS9 350

CAM: CLEVITE 229-1730 S2019

DURATION @.050" INT. 204
EXH 214
DURATION 270
280
LOBE SPREAD 112

VALVE LIFT .420
.443
CAM LIFT .280
.295

HEAD SPECS: #882
1.90 INT
1.50 EXH

Any comments on this setup are welcome, also need timing info.

Originally posted by froman
I have a 1970 C-20 longhorn pickup with 350, the compression is 165. I have just installed cam/lifters, timing chain and heads. It also has a edelbrock performer rpm dual plane manifold, edelbrock perfomer carb 750 cfm and headers.

specs:
LS9 350

CAM: CLEVITE 229-1730 S2019

DURATION @.050" INT. 204
EXH 214
DURATION 270
280
LOBE SPREAD 112

VALVE LIFT .420
.443
CAM LIFT .280
.295

HEAD SPECS: #882
1.90 INT
1.50 EXH

Any comments on this setup are welcome, also need timing info.

Some people might disagree with me but I would say your carb. is a little big.A 600 might work a little better.I would try and run 34-36 degree's total timing.Go out and try it and see if it( ping's) if it does than back it off a degree or two.

thats the same specs as the engine i had in my 2dr malibu. i agree with the 600 carb and 34* timing. ran good in my car like that

I would agree. you can go down in carb or go up in cam.

I would go with a crane cams cam kit. they can be had for $100.
and $30 or less for gaskets.
the cam specs
Lift: .454''/.454''
Duration: 272°/272°
RPM Range: 2000-5000


thinking of the gaskets. did you use the manifold end seals when you installed the intake?

the seals that come with the gaskets need to be in the trash can and not on the engine.