Rpm vs rpm2

thor347 · Mar 17, 2025

Hello all, I currently have a rpm upper and lower on my 347. 14lbs procharger, edelbrock rpm heads, custom cam and long tube headers. Trans is a Freddy brown 4stb, 3:73 rear. Basically a fun street car that is 1/4 mi raced occasionally.
I came across a rpm2 upper and lower and am getting mixed info if the lowers are the same.
Thanks

LILCBRA · Mar 17, 2025

Have you seen this thread on Corral?

https://www.corral.net/threads/difference-between-rpm-and-rpm-ii-intakes.644941/

Noobz347 · Mar 17, 2025

LILCBRA said:
Have you seen this thread on Corral?

https://www.corral.net/threads/difference-between-rpm-and-rpm-ii-intakes.644941/

Oh yeah... That thread clears it all up.

thor347 said:
Hello all, I currently have a rpm upper and lower on my 347. 14lbs procharger, edelbrock rpm heads, custom cam and long tube headers. Trans is a Freddy brown 4stb, 3:73 rear. Basically a fun street car that is 1/4 mi raced occasionally.
I came across a rpm2 upper and lower and am getting mixed info if the lowers are the same.
Thanks

It does appear though, that they are [not] the same and should not be mix-matched.

I don't know much about many of the posters in the thread above but I do know a bit about TMOSS and Ed Curtis (FTI Cams). If they're saying it's a bad idea, I would go with that [regardless] of the specific reasons.

Also according to them: A little port work on your RPM 1, puts it with the top performers for Windsor intakes.

One more thing...

Ping @tmoss

thor347 · Mar 19, 2025

Noobz347 said:
Oh yeah... That thread clears it all up.

It does appear though, that they are [not] the same and should not be mix-matched.

I don't know much about many of the posters in the thread above but I do know a bit about TMOSS and Ed Curtis (FTI Cams). If they're saying it's a bad idea, I would go with that [regardless] of the specific reasons.

Also according to them: A little port work on your RPM 1, puts it with the top performers for Windsor intakes.

One more thing...

Ping @tmoss

Thanks for your input. I think I'll get a few dragy hits, then pull the upper off and see how the ports match up. If it looks good I'll put the 2 on and see how it does against the 1. I'll post the results.

Rpm vs rpm2

thor347

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LILCBRA

I wish I didn't have all of these balls in the air

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

thor347

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