HELP!... with cam selection

chimneyman said:

Needing help with selecting the proper cam. I'll tell you what I'm wanting it for.
I'm getting my 350 blocked bored 30 over and my heads reworked. I'm wanting a good street engine that has a good sound that's not so loud I can't take it on short road trips. I've been looking at the XE262 Comp https://m.summitracing.com/parts/cca-cl12-238-2) I've been told this has a decent lope that's not overbearing and I can still keep stock valve springs. Keep in mind I'm not going to be racing and plan on keeping my tbi. Thanks in advance for ALL advice. I'm open to comments and suggestions.

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michael hurd said:

That cam may have more duration than the stock programming may like, and the TBI system is pretty sensitive to vacuum. Perhaps a step down to the next smaller one might be a bit better if you don't plan on a tuning session. Keeping stock valve springs, might want to install a new set of 'stock' replacements, they are likely lower on seat pressure after all this time. Not expensive, and allows you to get the full RPM capability out of the cam.

Long tubes, good idea, might check out some of the stainless offerings on eBay, 1.5" primaries if you can find them. True duals, not so much, you lose the scavenging effect of alternating pulses pulling fresh fuel into the cylinders. A two into one Y and a 3" single pipe would be preferable here. I would space the injector pod up rather than an under TB spacer.

You can check the spray pattern of the injectors with a strobe light... a timing light can do this, to make it flash faster, put the inductive pick up on the coil wire instead of a plug wire, and point the gun at the open TB.

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michael hurd said:

If you do intend to use dual pipes ( I don't see the need ) then either an H or X pipe. Summit and others have X and H pipes available.

On a mostly stock engine, using a well designed Y pipe and a single 3 or 3.5" pipe would be my choice. Of course it all comes down to preference.

Also, I would take a look at the muffler flow chart before pulling the trigger on the Flowmasters.

This link might give you a bit more insight.

http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

Muffler flow chart halfway down the page.

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michael hurd said:

My preference would be a stainless Magnaflow over a Flowmaster, based on flow and lifespan. Check out the muffler flow chart and subsequent information contained in the link above. There is a wealth of information there, kinda like trying to take a sip on a fire hose.

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