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Old 05-28-2019, 12:00 PM
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Pontiac 400 cam selection

Hello evryone i am currentley running a pontiac 400 in my trans am and i want to do a cam upgrade it is a street/strip car the engine is mostley stock it has a compression ratio of 9.2 longtube headers and a wenzler tunnelram intake with dual impco 425 propane mixers the heads have some porting done to them i would like to know what camshaft you guys would reccomend that would work good with the tunnelram intake

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Old 05-28-2019, 12:26 PM
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need new head flow figures after porting. Not all Pontiac heads need/want a split duration cam.
With 9;1 CR WHAt you really need is a turbo charger. Your cr is way too low for N.A. and propane. Also most mixers flow around 425 cfm so the turbo can fix that too
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Old 05-28-2019, 04:02 PM
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You are right the cr is too low for propane but i have a 455 that is going in it next year with a lot higher compression right now i am looking for the best working cam setup for the 400 for this summers races
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Old 05-28-2019, 04:57 PM
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Dont waste your time changing the cam,
tune the transmission and suspension
sort out the wheels/tires
get some steering wheel time
win a race in a slower bracket.

not gonna get much air and a bigger cam will probably be worse at low rpm with propane

If you went to the trouble of decking the block and maybe shaving the heads etc to match the cam then the money you spend will add up quickly
no flow numbers on heads makes for a guessing game on the cam.
maybe take off the mixers and buy 2 750 cfm edelbrocks or Holleys if you have lots of money
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