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Old 04-30-2019, 12:21 PM   #1
35boulder
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New Crate Motor-Manifolds vs Headers

Posted this in the wrong forum earlier. I'm needing to replace the tired 307 in my '69 SWB. Was wondering if any of y'all had used a new set of exhaust manifolds on your crate motor install instead of headers. I'm not building a hot rod just an in town truck. Thanks for any info.
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Old 04-30-2019, 12:29 PM   #2
Ziegelsteinfaust
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Re: New Crate Motor-Manifolds vs Headers

Exhaust manifolds are a good choice if your more.concerned about noise. Rather then the most HP possible.

Yet there are exhaust manifolds easily available that help you get some of the best of both worlds. At least on mild/warmed up engines.

The traditional Corvette ram horns, but you need to notch your cross member.

Another fine choice is 96+ Vortec 350 exhaust manifolds from 1 ton trucks. You have to check, but in a circle track magazine which I read. Mentioned they were good, but I forgot the exact application.
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Old 04-30-2019, 12:54 PM   #3
68 P.O.S.
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Re: New Crate Motor-Manifolds vs Headers

Stock style exhaust manifolds flow very well and are completely acceptable for your needs since it sounds like its going to be a mild engine. With a mild engine you likely won't notice a difference between the two. If you go with headers, get a quality set like Doug's Tri-Y's for torque, don't get a cheap $99 set or you'll have nothing but problems.
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Last edited by 68 P.O.S.; 04-30-2019 at 03:23 PM.
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Old 04-30-2019, 01:41 PM   #4
MARKDTN
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Re: New Crate Motor-Manifolds vs Headers

On a stock crate motor, manifolds are fine. Also less likely to leak IMHO.
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Old 04-30-2019, 04:15 PM   #5
Grumpy old man
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Re: New Crate Motor-Manifolds vs Headers

Unless your constantly over 5,000 rpm headers have nothing on rams horn manifolds . You don't have to notch your cross member to run 2 1/2" straight drop rams , no issues with leaks or spark plug access .
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Old 05-01-2019, 09:58 AM   #6
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Re: New Crate Motor-Manifolds vs Headers

A lot less issues with stock manifolds...just my 2 cents worth.
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Old 05-01-2019, 11:54 AM   #7
toolboxchev
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Re: New Crate Motor-Manifolds vs Headers

Quote:
Originally Posted by Grumpy old man View Post
Unless your constantly over 5,000 rpm headers have nothing on rams horn manifolds . You don't have to notch your cross member to run 2 1/2" straight drop rams , no issues with leaks or spark plug access .
Nice Work Grumpy! And how true....
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Old 05-03-2019, 05:08 PM   #8
35boulder
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Re: New Crate Motor-Manifolds vs Headers

So Grumpy, did you purchase some new manifolds from Summit etc?
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Old 05-03-2019, 05:20 PM   #9
Grumpy old man
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Re: New Crate Motor-Manifolds vs Headers

They came from Summit or Jegs , They were on sale a while back for $128.00 came with hardware and the chrome is pretty good . I like shiny
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Old 05-03-2019, 05:25 PM   #10
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Re: New Crate Motor-Manifolds vs Headers

This is the 4" bend on 2 1/2" pipe to clear cross member any good muffler shop should be able to fit them without issues .
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Old 05-03-2019, 11:34 PM   #11
c10Eric
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Re: New Crate Motor-Manifolds vs Headers

Hey guys - I've got a 68 c10 with a 350 crate motor... and was thinking of replacing the stock manifolds (one side's got a leak) with some new shiny ones. Any suggestions on what ones I should be looking at?
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