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Headers for 1975 360 LA for Dodge M37

Old 06-10-2019, 11:17 AM
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Headers for 1975 360 LA for Dodge M37

Looking for shorty headers with 1 3/4" to handle 500-550 hp, was told shorty headers with 1 5/8" were too small.
Have not found larger primary tube shorty headers, placing in an old 1952 doge M37, and do not have much space.
I am hooking up to Edelbrock 60775, heads.

Any suggestions ?

Thanks

Del
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Old 06-10-2019, 12:21 PM
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Welcome to the site Del..... Sounds like a great project. I'm going to suggest you find a local guy to see if they can build some custom fabbed Headers to fit you application for the truck. Good Luck... Keep us posted...
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Old 06-10-2019, 02:03 PM
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1 5/8 are small but will cost you less power than you think, shorty headers will hurt you more.
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Old 06-10-2019, 02:26 PM
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Welcome.

With 1.4 to 1.53 hp/cubic inch we're looking at a high end performance, high rpm engine. To maintain that I'd be wanting 1 7/8"- 2" O.D. long tube, tuned headers.
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Old 06-10-2019, 03:22 PM
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Originally Posted by RacerHog View Post
Welcome to the site Del..... Sounds like a great project. I'm going to suggest you find a local guy to see if they can build some custom fabbed Headers to fit you application for the truck. Good Luck... Keep us posted...
Sounds like I do need custom headers, my engine builder does not have a set of mopar headers
for his Dyno testing, may need to buy a cheap pair then pay for custom.
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Old 06-10-2019, 03:25 PM
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Originally Posted by Coronet 500 View Post
Welcome.

With 1.4 to 1.53 hp/cubic inch we're looking at a high end performance, high rpm engine. To maintain that I'd be wanting 1 7/8"- 2" O.D. long tube, tuned headers.
Sounds like larger headers, may be heading towards custom, thanks for the advise.
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Old 06-10-2019, 03:25 PM
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Maybe you could barrow a set , you would think that he would know a mopar guy.
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Old 06-10-2019, 06:34 PM
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Originally Posted by Iowan View Post
Maybe you could barrow a set , you would think that he would know a mopar guy.
Harvey's Automotive and Machine in Norwalk, Iowa is building the engine, Brett uses the dyno at ostrich racing engines he use to work there.
I asked the same question, but not a lot of guys run mopar engines. I am adding a Holley sniper EFI carb and just bought CVF front pulleys.





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Old 06-11-2019, 05:37 AM
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Check with TTI.. They mite have some that might fit the STD truck version.... But Check to see if some of the MIL. stuff is in the way? If you still have it attached.???
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Old 06-11-2019, 03:27 PM
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What cam are you using to make the 500-550 hp?
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Old 06-11-2019, 04:55 PM
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Originally Posted by Coronet 500 View Post
What cam are you using to make the 500-550 hp?
Just following my mechanic I think it will be closer to 500, photos of parts.
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Old 06-11-2019, 06:03 PM
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I can't read the cam numbers could you please post them?
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Old 06-12-2019, 03:26 AM
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Originally Posted by Iowan View Post
I can't read the cam numbers could you please post them?
I need to ask him
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Old 06-13-2019, 02:39 PM
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Old 06-13-2019, 04:01 PM
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I just noticed that piston with 1.457" compression height is for a 4" stroke crank 408 c.i., looks like a cast crank too. Calculates to 9.7 c.r., sound about right?

Last edited by Coronet 500; 06-13-2019 at 04:07 PM.
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Old 06-14-2019, 08:38 PM
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Originally Posted by Coronet 500 View Post
I just noticed that piston with 1.457" compression height is for a 4" stroke crank 408 c.i., looks like a cast crank too. Calculates to 9.7 c.r., sound about right?
We added a scat cast 4 inch stroker, mechanic was thinking better metal than a few others with APR studs. The cam was custom still need to find more detail numbers were not on my billing sheet.
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