Offshoreonly.com - Search Results
Offshoreonly.com

Go Back  Offshoreonly.com > Search Forums
Reload this Page >

Search Results

Register
FAQ
Calendar
Today's Posts
Search
Vendor Directory
Notices
 
Page 1 of 8
1
2
3
Last »
Search: Posts Made By: hpmaniac
Showing results 1 to 25 of 194
Search took 0.01 seconds.
Forum: General Q & A
05-11-2026, 10:20 AM
Replies: 9
Views: 485
Posted By hpmaniac

Not in a boat. 36 will knock 100%, 36 is perfect...

Not in a boat. 36 will knock 100%, 36 is perfect in a 69 camaro. The only way to know is check the ground strap heat line on a new spark plug. set the timing at 32 degrees total and go make a run...
Forum: Do It Yourself, Boating on a Budget
05-06-2026, 09:08 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

call young performance, that guy is amazing and...

call young performance, that guy is amazing and has a wealth of knowledge. One of the best marine performance shops out there. Possibly the best! I've done tons of business with the man and his...
Forum: General Q & A
05-06-2026, 03:16 PM
Replies: 9
Views: 485
Posted By hpmaniac

I would run between 32 and 34 total timing.

I would run between 32 and 34 total timing.
Forum: Do It Yourself, Boating on a Budget
05-06-2026, 01:35 PM
Replies: 18
Views: 822
Posted By hpmaniac

They just are way to big of head, yes its a big...

They just are way to big of head, yes its a big cubic inch engine but many people forget that we are trying to accelerate a engine from idle to 52-5800 rpm for most builds and that large head will...
Forum: Do It Yourself, Boating on a Budget
05-06-2026, 10:14 AM
Replies: 18
Views: 822
Posted By hpmaniac

Difficult to find a set ported and stay in a...

Difficult to find a set ported and stay in a budget.
cheap and hp gains never come together. I'd buy afr 265 or 290 heads and be done. Massive power gain, 75-100 hp at peak and bunch more torque.
Forum: Do It Yourself, Boating on a Budget
05-05-2026, 11:12 AM
Replies: 18
Views: 822
Posted By hpmaniac

Here is the 2nd set of 781 heads i ever ported....

Here is the 2nd set of 781 heads i ever ported. I have the on the bench waiting to go on another 496 for my truck....
Forum: Do It Yourself, Boating on a Budget
05-05-2026, 11:02 AM
Replies: 18
Views: 822
Posted By hpmaniac

Yep starting watching vortec pro years ago. I...

Yep starting watching vortec pro years ago. I learned much of the porting from him. Last set i had flowed went 314 at 650 lift on intake. My 496 peaked at 6300 if i remember.
Forum: Do It Yourself, Boating on a Budget
05-04-2026, 08:33 PM
Replies: 18
Views: 822
Posted By hpmaniac

I've used mike Jones cams for years, his stuff...

I've used mike Jones cams for years, his stuff works. I will not use anyone else.
Forum: Do It Yourself, Boating on a Budget
05-04-2026, 08:32 PM
Replies: 18
Views: 822
Posted By hpmaniac

I've ported about 10 sets of 049 oval ports and...

I've ported about 10 sets of 049 oval ports and the exhaust really responds with some mild porting, raise the roof about 100ths and clean up the short turn radius and they will gain 50 cfm, takes 15...
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 08:21 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

max 5 29 pitch

max 5 29 pitch
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 05:07 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

Steve stepp tought me a lot about driving the...

Steve stepp tought me a lot about driving the boat, amazing how sensitive they are to having the correct prop.
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 01:10 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x901/20250607_203011_5e88202f42f953bf67c838c97d750e0f62344789.jpg
motor goes in this girl, ultra clean 2003 velocity 280, hull has...
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 01:04 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

Upgrades are these my spec hydraulic roller,...

Upgrades are these
my spec hydraulic roller, 241 251 637 621 intake on a 114 installed at 110.5 intake cenerline.
gm hydraulic lifters.
Afr full cnc 315 head with inconel exhaust valves.
young...
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 12:55 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x901/20260503_104744_ea780d7964e13ca3b51ac00d8de1ecaeb5264449.jpg...
Forum: Do It Yourself, Boating on a Budget
05-03-2026, 12:53 PM
Replies: 54
Views: 10,591
Posted By hpmaniac

Make sure you tack welded the oil pump screen,...

Make sure you tack welded the oil pump screen, locktite windage tray nuts, check cam endplay, between 3 and 8 thousands. If you have none you can remove some material from the cam thrust plate. On...
Forum: Do It Yourself, Boating on a Budget
05-02-2026, 11:53 AM
Replies: 23
Views: 1,158
Posted By hpmaniac

did you have any issues with valve cover fitment...

did you have any issues with valve cover fitment on yours? I don't like the way mine feel, I machined the 2 rockers per side that touch, the adjustment rocker nuts clear but damn there close. It's...
Forum: Do It Yourself, Boating on a Budget
05-01-2026, 03:30 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

I just measured mine, I checked between 10 before...

I just measured mine, I checked between 10 before tdc and 10 after with dial indicator and never found anything less than 225ths. My cam is 621 lift intake 241 at 50. Afr 315 2.25 intake. I checked...
Forum: Do It Yourself, Boating on a Budget
04-30-2026, 03:53 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

Hmm i bet those has a 2.3 intake valve. That is...

Hmm i bet those has a 2.3 intake valve. That is crazy they had radial intake clearance issues.
Forum: Do It Yourself, Boating on a Budget
04-30-2026, 01:28 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

I agree, however i can tell you about a ford 347...

I agree, however i can tell you about a ford 347 i built back about 15 years ago. Supercharged 347 dart block afr heads big solid roller. 9.5 compression 30 lbs boost on c16. Car was making 1100...
Forum: Do It Yourself, Boating on a Budget
04-30-2026, 12:15 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

The stock head has a 2.25 intake valve, so unless...

The stock head has a 2.25 intake valve, so unless the cam was installed wrong and never degreed or the head maybe had a 2.30 intake you should of had plenty of room for the valve.
Forum: Do It Yourself, Boating on a Budget
04-30-2026, 12:06 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

crazy, did you degree the cam? those heads ,must...

crazy, did you degree the cam? those heads ,must of had a 2.30 intake valve i bet. Mine have a 2.25 intake valve and i have plenty of room with the stock piston.
Forum: Do It Yourself, Boating on a Budget
04-30-2026, 10:03 AM
Replies: 23
Views: 1,158
Posted By hpmaniac

I had a option 3, I pulled the rotating assembly,...

I had a option 3, I pulled the rotating assembly, grabbed my longboard with 220 grit and cleaned up the deck, 20 minutes and it was 75% better. I checked deck again with my straight edge bar and it's...
Forum: Do It Yourself, Boating on a Budget
04-28-2026, 01:03 PM
Replies: 23
Views: 1,158
Posted By hpmaniac

Sci 575 head replacement.

I pulled my low hr sci 575 for cam head upgrade, 112 hrs on engine, it was running perfectly, no leaks, no issues. Not happy with the deck condition, it's flat i checked that but there is some...
Forum: Do It Yourself, Boating on a Budget
04-28-2026, 12:50 PM
Replies: 7
Views: 1,256
Posted By hpmaniac

Damn, if we lived closer i would just give you my...

Damn, if we lived closer i would just give you my 575 sci heads, just pulled them off for swap, they only have 112hrs.
Forum: General Q & A
04-23-2026, 03:59 PM
Replies: 23
Views: 2,238
Posted By hpmaniac

30 years ago i was at a gm parts event and warren...

30 years ago i was at a gm parts event and warren Johnson was there, The big block chevy god, I Talked to him for a good 30 minutes picking his brain, i had so many questions my brain was in...
Showing results 1 to 25 of 194
 
Page 1 of 8
1
2
3
Last »


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.