My car has a Ramjet 350 motor where is the PVC VALVE
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,383
Likes: 350
My car has a Ramjet 350 motor where is the PVC VALVE
Like I said my 69 has a RAMJET 350 motor but the driver side valve clover just has 2 breathers and passenger has 1 breather . Goggle says it has a PVC valve but even if I replaced a breather cap where do I pull vacuum. I looked where goggle says but I can't find anything
Le Mans Master
Joined: Jan 2001
Posts: 6,711
Likes: 1,371
socal_tom
Gimme a sec and I'll go get a picture of mine....
Gimme a sec and I'll go get a picture of mine....
Like I said my 69 has a RAMJET 350 motor but the driver side valve clover just has 2 breathers and passenger has 1 breather . Goggle says it has a PVC valve but even if I replaced a breather cap where do I pull vacuum. I looked where goggle says but I can't find anything
Drifting
Joined: Jun 2025
Posts: 1,672
Likes: 582
sorry 'bout yer cornflakes
Special Parts Notice This part has been specifically designed for Off-Highway application only. Since the installation of this part may either impair your vehicle's emission control performance or be uncertified under current Motor Vehicle Safety Standards, it should not be installed in a vehicle used on any street or highway. Additionally, any such application could adversely affect the warranty coverage of such an on-street or highway vehicle.
above quote from page 3 of GM's Installation guide for this RamJet 350. Elsewhere, it is described as derived from a marine engine.
https://www.chevrolet.com/content/da...e-19417619.pdf
above quote from page 3 of GM's Installation guide for this RamJet 350. Elsewhere, it is described as derived from a marine engine.
https://www.chevrolet.com/content/da...e-19417619.pdf
Le Mans Master
Joined: Jan 2001
Posts: 6,711
Likes: 1,371
socal_tom
Google AI is your friend (well, until Skynet decides otherwise!):
As identified in post #5 above--
On a Ramjet 350 engine, the PCV valve is typically located on the driver's side of the intake manifold, roughly in the middle, rather than on the valve covers as with traditional small-block Chevy engines. It is connected via a rubber hose with a tight elbow bend, running from the lower intake manifold to the air chamber. [1]
Key Details:
Google AI is your friend (well, until Skynet decides otherwise!):
As identified in post #5 above--
On a Ramjet 350 engine, the PCV valve is typically located on the driver's side of the intake manifold, roughly in the middle, rather than on the valve covers as with traditional small-block Chevy engines. It is connected via a rubber hose with a tight elbow bend, running from the lower intake manifold to the air chamber. [1]
Key Details:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Drifting
Joined: Jun 2025
Posts: 1,672
Likes: 582
Well, it would seem the PCV is pulling oily vapor from upper portion of lifter valley and from just off center & to the left & approx midway front-rear. From there, those vapors are drawn (via short hose) into the RamJet long, horizontal cast alum Plenum (to be burned w/ fuel-air charge).
I don't much like that apparent loop of vapor & air thru crankcase. --- Because there's no real loop; as is in conventional sbc GM PCV system design.
But, if it's pulling oily vapors from where it seems to me, then It seems the entire fresh air INTAKE supply would have to be thru valve cover breathers.
And, if so, I think it needs fresh air to be drawn IN thru BOTH R & L VC breathers. Perhaps my understanding of the RamJet direction of flow is Reversed; or Correct ?
And NO, I didn't consult w/ any fn AI.
I don't much like that apparent loop of vapor & air thru crankcase. --- Because there's no real loop; as is in conventional sbc GM PCV system design.
But, if it's pulling oily vapors from where it seems to me, then It seems the entire fresh air INTAKE supply would have to be thru valve cover breathers.
And, if so, I think it needs fresh air to be drawn IN thru BOTH R & L VC breathers. Perhaps my understanding of the RamJet direction of flow is Reversed; or Correct ?
And NO, I didn't consult w/ any fn AI.
Last edited by Rebelyell; May 13, 2026 at 09:40 PM.
Burning Brakes
Joined: Sep 2016
Posts: 935
Likes: 433
From: Dutchess county New York
What EFI are you running on that RamJet ?
I bought mine a little over a year ago and it didn't want to idle or start right so I sent the ECU out to OBD Diagnostics for a custom map that cured all that. It's MEFI4a.
I had looked into Terminator X for it but almost had a coronary when I added all that up and I am just looking into possible alternatives. Just curious. I have ideas for that car, probably all bad for my wallet
I bought mine a little over a year ago and it didn't want to idle or start right so I sent the ECU out to OBD Diagnostics for a custom map that cured all that. It's MEFI4a.
I had looked into Terminator X for it but almost had a coronary when I added all that up and I am just looking into possible alternatives. Just curious. I have ideas for that car, probably all bad for my wallet
Le Mans Master
Joined: Jan 2001
Posts: 6,711
Likes: 1,371
pigfarmer
I'm running my Ramjet 350 with EZ-EFI 2.0 (retrofit kit for GM TPI engines) for a little over 12 years.
Hated the MEFI thing - couldn't do a thing with it.
Took the out GM MEFI distributor and reinstalled my old (was expensive, now insane) Corvette specific tach-drive MSD distributor ....which is, of course, now gutted with no tach drive, no vac advance, and locked out since the EZ-EFI 2.0 controls the timing.....but I had it --- so I used it.
I'm running my Ramjet 350 with EZ-EFI 2.0 (retrofit kit for GM TPI engines) for a little over 12 years.
Hated the MEFI thing - couldn't do a thing with it.
Took the out GM MEFI distributor and reinstalled my old (was expensive, now insane) Corvette specific tach-drive MSD distributor ....which is, of course, now gutted with no tach drive, no vac advance, and locked out since the EZ-EFI 2.0 controls the timing.....but I had it --- so I used it.
Last edited by carriljc; May 14, 2026 at 11:46 AM.
Burning Brakes
Joined: Sep 2016
Posts: 935
Likes: 433
From: Dutchess county New York
@carriljc
Thanks, I'll look into it.
I really had to hold my breath on this thing because it was $$$ when I sent it out for the custom tune but the owner of OBD Diagnostics knows his stuff. It did exactly what he said it would and the car runs perfect so I'm not fiddling with it one bit. Like I said I do have some ideas about what it might get as the next project and the minute I change anything that MEFI would probably have to go.
Thanks, I'll look into it.
I really had to hold my breath on this thing because it was $$$ when I sent it out for the custom tune but the owner of OBD Diagnostics knows his stuff. It did exactly what he said it would and the car runs perfect so I'm not fiddling with it one bit. Like I said I do have some ideas about what it might get as the next project and the minute I change anything that MEFI would probably have to go.
Le Mans Master
Joined: Jan 2001
Posts: 6,711
Likes: 1,371
Sounds great. I'd leave it be if it runs perfect.
@carriljc
Thanks, I'll look into it.
I really had to hold my breath on this thing because it was $$$ when I sent it out for the custom tune but the owner of OBD Diagnostics knows his stuff. It did exactly what he said it would and the car runs perfect so I'm not fiddling with it one bit. Like I said I do have some ideas about what it might get as the next project and the minute I change anything that MEFI would probably have to go.
Thanks, I'll look into it.
I really had to hold my breath on this thing because it was $$$ when I sent it out for the custom tune but the owner of OBD Diagnostics knows his stuff. It did exactly what he said it would and the car runs perfect so I'm not fiddling with it one bit. Like I said I do have some ideas about what it might get as the next project and the minute I change anything that MEFI would probably have to go.