Just another jet..

[Colton]

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4. Opinion on what to do next? Newb

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July 05, 2023, 07:49:10 PM | Calendar

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Colton​

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Opinion on what to do next? Newb​

« on: Today at 07:42:27 PM »

Quote Modify
I have a 71 glastron with a JC pump, unknown cut on the impeller. Ive done a few things to add power to the 350 that's currently in it, but can't seem to get the thing to turn more rpm. 4200 max currently and from when I originally purchased it.
Original setup was just a goodwrench 350 (like 8.2:1 compression)with a edelbrock vacuum 600, osco manifolds, performer intake.. basic, reliable.
New setup currently:
Ported fresh double humps set up for.500 lift 64cc chambers
Thin .015 head gaskets
9.2:1 best I could math.
Performer intake
Holley 670 vac seconds
Mechanical and vacuum advance is locked out at 33⁰
Clay smith .450 lift .280 advertised duration on a 108⁰ center (degreed in)

Still no more rpm than it originally had. It comes out of the hole pretty good, doesn't really drink much fuel compared to the edelbrock carbed setup. Definitely more crisp response and smooth running.
I'm guessing the boat had a big block in it originally, as I don't think glastron offered the Sbc. They did have the 351w that year, but with the bell housing being BPO I'm conflicted. Would it make sense this thing has a AA cut or?
I plan to eventually get a place diverter, just curious what's going on with it before I add that.
I'm all ears!
Long time lurker and diesel/horsepower junkie.

 

[Colton]

 

[Colton]

A little progress on the big block.

 

[old rigger]

Here's a link to a fuzzy copy of the 1971 Glastron. Not sure which model you have, I know it's one with the 'aqua lift' bottom, but the one on this page of the brochure came with a SBC.

Cool project, pump looks great.

1971 - Minnesota Classic Glastron Owners Association

Minnesota Classic Glastron Owners Association Chapter Website

www.cgoamn.com

Scroll down to the first jet...

 

[Colton]

This one is a 1972. V184 crestflite.. thanks for the link!

 

[wzuber]

1. SoCal Jet Boats
2. Tech Talk
3. Engine Mechanical / Electrical
4. Opinion on what to do next? Newb

Search

July 05, 2023, 07:49:10 PM | Calendar

---

0 Reactions

• « previous
• next »
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• Add poll
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Pages: [1]

Colton​

• 
• Karma: +0/-0

Opinion on what to do next? Newb​

« on: Today at 07:42:27 PM »

Quote Modify
I have a 71 glastron with a JC pump, unknown cut on the impeller. Ive done a few things to add power to the 350 that's currently in it, but can't seem to get the thing to turn more rpm. 4200 max currently and from when I originally purchased it.
Original setup was just a goodwrench 350 (like 8.2:1 compression)with a edelbrock vacuum 600, osco manifolds, performer intake.. basic, reliable.
New setup currently:
Ported fresh double humps set up for.500 lift 64cc chambers
Thin .015 head gaskets
9.2:1 best I could math.
Performer intake
Holley 670 vac seconds
Mechanical and vacuum advance is locked out at 33⁰
Clay smith .450 lift .280 advertised duration on a 108⁰ center (degreed in)

Still no more rpm than it originally had. It comes out of the hole pretty good, doesn't really drink much fuel compared to the edelbrock carbed setup. Definitely more crisp response and smooth running.
I'm guessing the boat had a big block in it originally, as I don't think glastron offered the Sbc. They did have the 351w that year, but with the bell housing being BPO I'm conflicted. Would it make sense this thing has a AA cut or?
I plan to eventually get a place diverter, just curious what's going on with it before I add that.
I'm all ears!
Long time lurker and diesel/horsepower junkie.

Honestly it's anybodies guess at what impeller is in it at this age etc. Of the boat. Only real way to know for sure is to pull the bowl and measure it. Definately not a AA at that rpm and eng. Specs

 

[Colton]

It did have a AA impeller in it when i got it!. B/C cut now. The motor in the original post unassembled itself soon after that post... the engine with the quickfuel carb above turned the B/c 5100 rpm all of last summer.. it's on the shelve as a spare and the boat is now getting a decent big block

 

[Colton]