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Search: Posts Made By: NHGuy
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Yesterday, 04:12 PM
Replies: 4
Views: 527
Posted By NHGuy

If it has a 1.5 ratio drive you could run a 19...

If it has a 1.5 ratio drive you could run a 19 pitch. I do on an F223LS with a 383 and Alpha Gen 2. It lets the engine get up a couple hundred rpms higher, where there is more horsepower. Plus it...
05-30-2021, 06:30 AM
Replies: 12
Views: 568
Posted By NHGuy

I know, oldish thread, but it's interesting. ...

I know, oldish thread, but it's interesting.
It does need the smaller pitch propeller due to the different drive ratio.
But as said, I'm interested. It might probably still need that wiring issue...
05-29-2021, 02:20 PM
Replies: 6
Views: 262
Posted By NHGuy

Too late, I already have the carburetor, t shirt,...

Too late, I already have the carburetor, t shirt, and hat.

Maybe the next engine I do...
05-29-2021, 09:16 AM
Replies: 6
Views: 262
Posted By NHGuy

I made note of the throttle position where the...

I made note of the throttle position where the AFRs go to the 12's. I'll have to put it there and look at the bores. it's mechanical secondary so it should open them.
Either way it would be good to...
05-29-2021, 09:08 AM
Replies: 10
Views: 559
Posted By NHGuy

I have a marine Quickfuel 750 too. On a 10.3:1...

I have a marine Quickfuel 750 too. On a 10.3:1 383. Mine is sensitive to fuel pressure. If it's over 7 lbs it wets spark plugs. Thankfully I put a gauge on there. Once around 6 psi it's happier.
Not...
05-29-2021, 08:11 AM
Replies: 6
Views: 262
Posted By NHGuy

help me pick jets

Chevy 383, 10.3:1, Quickfuel Marine 750 which can be treated like a Holley double pumper with 4 corner idle. Has very similar design and many parts interchange.
I ran the boat yesterday, cooler...
Forum: General Q & A
05-27-2021, 03:50 PM
Replies: 45
Views: 1,343
Posted By NHGuy

Is this boat new to you? Can it get to 4600 rpm?...

Is this boat new to you? Can it get to 4600 rpm? If it's over propped that can contribute to heat. Too much timing can be a part of it too.
Forum: General Q & A
05-27-2021, 03:33 PM
Replies: 8
Views: 637
Posted By NHGuy

Glad you said that. I never noticed the...

Glad you said that. I never noticed the discussions about the DUI gaps. I just put in plugs yesterday and did .055. I just switched em to .038 and gave it a start, seems smoother on choke any way. ...
Forum: General Q & A
05-27-2021, 12:37 PM
Replies: 7
Views: 276
Posted By NHGuy

I have had both. I'd fix the Holley. It's jut a...

I have had both. I'd fix the Holley. It's jut a gasket change and cleanup.
05-27-2021, 12:29 PM
Replies: 45
Views: 2,108
Posted By NHGuy

Yes to spacers between the headers and tails. You...

Yes to spacers between the headers and tails. You might have to make them but it will be worthwhile. Then locate the sensors up high on the spacers so gravity might help keep the water away.
Or...
05-27-2021, 01:01 AM
Replies: 45
Views: 2,108
Posted By NHGuy

When you do the AFR system you will need to do an...

When you do the AFR system you will need to do an oxygen sensor spacer. It's a 90 degree elbow that keeps your sensor back out of the exhaust flow.
I was a know-it-all that they are a cheat and...
05-27-2021, 12:38 AM
Replies: 2
Views: 241
Posted By NHGuy

I decided to be a cheapskate, ordered a second...

I decided to be a cheapskate, ordered a second Schumacher smart charger. So both batteries can stay on charger while boat sits between uses. I'm a day dunker who gets maybe 6 or 10 overnights per...
05-26-2021, 12:38 PM
Replies: 3
Views: 198
Posted By NHGuy

Cool, large opening then.

Cool, large opening then.
05-26-2021, 11:13 AM
Replies: 3
Views: 198
Posted By NHGuy

Breather Grommet openings

Chevy 383, I have some aluminum finned valve covers. And it looks bad when they aren't clean.

I bought some new grommets for my breathers, they come from the factory without a hole and I'm...
Forum: General Q & A
05-24-2021, 01:29 PM
Replies: 20
Views: 674
Posted By NHGuy

Wishing you a long and trouble free season.

Wishing you a long and trouble free season.
05-22-2021, 05:34 PM
Replies: 2
Views: 241
Posted By NHGuy

Victron Battery Isolator

So I understand these isolators have solved the energy robbing issue that older style diode isolators have. Supposedly they only take 1 to 2% of your alternator output whereas the diode type can...
Forum: General Q & A
05-22-2021, 04:57 PM
Replies: 15
Views: 677
Posted By NHGuy

Young is certainly more experienced than me. But...

Young is certainly more experienced than me. But I was looking over the SBC motors in the OE manual just yesterday. Came to the conclusion that the high HP engines had roller cams and 9.3:1...
Forum: General Q & A
05-22-2021, 04:30 PM
Replies: 13
Views: 413
Posted By NHGuy

Well they may be 1/4 and they may be 5/16 but...

Well they may be 1/4 and they may be 5/16 but they are no bigger. I had to drill mine out to get 3/8" ID on my 383.
05-21-2021, 02:45 PM
Replies: 5
Views: 573
Posted By NHGuy

Last summer I was getting a lean stumble at mid...

Last summer I was getting a lean stumble at mid rpms after a few minutes steady speed.
When it happened the AFR would shoot up, and If I throttled back or if it stalled, it would have normal air/...
Forum: General Q & A
05-20-2021, 09:45 PM
Replies: 8
Views: 574
Posted By NHGuy

If it has Thunderbolt V you ground the purple and...

If it has Thunderbolt V you ground the purple and white wire

V6 and V8 Carbureted Models (Thunderbolt V Ignition)

1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect...
02-14-2021, 01:00 PM
Replies: 8
Views: 738
Posted By NHGuy

The roller cam 270 is biggest for sterndrive. Ie....

The roller cam 270 is biggest for sterndrive. Ie. won't revert with normal exhaust. The flat tappet 270 cam recommends "needs better exhaust"
I think people get a little hung up on the roller vs...
02-14-2021, 10:36 AM
Replies: 5
Views: 1,080
Posted By NHGuy

Thanks for this. I am doing oil cooling soon. All...

Thanks for this. I am doing oil cooling soon. All points are valid. And righto, design it so you leave the NPT fittings in place sealed up. Use the -AN fittings when opening things.
Or buy -AN...
10-16-2020, 05:33 AM
Replies: 7
Views: 686
Posted By NHGuy

Yes, it's the lowest I recall and I've been...

Yes, it's the lowest I recall and I've been boating here since the early 70's.
Regarding rocks. I won't say what lake this is on...
My buddy rents his 80 year old waterfront camp to one of our...
10-15-2020, 04:28 AM
Replies: 7
Views: 686
Posted By NHGuy

Yes, maybe I didn't say it well, but I did a...

Yes, maybe I didn't say it well, but I did a prefilter with Holley's recommended 100 micron rating.
So today if it passes a leak check I will get one more ride before winterizing.
10-14-2020, 04:12 PM
Replies: 7
Views: 686
Posted By NHGuy

Fuel Water Separator After Fuel Pump, OK?

I was having some fuel issues this summer on my carb 383 Chevy. Every once in a while it would stumble and my AFR would go lean. When this happened my normally cold fuel bowl would be hot, so would...
Showing results 1 to 25 of 378
 


 
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