Like Tree0Likes

Decided to modify my 330 hp 454's

Old 04-21-2002, 10:03 PM
Bo Knows
Posts: n/a
Default Decided to modify my 330 hp 454's

I've been undecided about modifing the motors in my boat so I thought if I could find 2 early GM high rise intakes I would go ahead with the rest of the plan. Last week I found them, so here's the plan. Checkmate 281 with twin 330hp 454's runs 66.7 mph on GPS. Installing GM high rise intakes, both ported and passage between primary & secondary cut out. Adding 1" spacer under carb. Port matching heads to intake, enlarging exhaust outlet port on head, porting heads completely. Keeping quadrajet carb but will richen up secondary. Installing Crane cams #133801, with lift 529 & 525, duration 222 - 234, & Crane valve springs. Anybody got any ideas, help or comments on what mph I can expect, or something I might have missed? I know I should up grade exhaust but can't afford it at this time. Hopefully at a later date. I'm just a poor man trying to play a rich mans game !!

Reply With Quote
Old 04-21-2002, 10:19 PM
Charter Member #655
Charter Member
dyno's Avatar
Join Date: Dec 2000
Location: Holland, Michigan
My Boats: 1993 Sonic 31ss
Posts: 4,939

sound like a good start then you can add exhaust and carbs later roller rockers are a big help too! I made a little more up grades to my 330's merlin heads ,carbs and exhaust and MSD ignitions I gained 10mph.
If your boat has a sail do you ride a horse to the ramp?
dyno is offline  
Reply With Quote
Old 04-22-2002, 11:42 AM
Join Date: Feb 2002
Location: Honeoye, NY
My Boats: '77 Martini 7 Meter
Posts: 763

Go to HPBOOKS-1297, " Big Block Chevy Marine Performance" by Dennis Moore. Just TONS of great info. What to do first, how much it should cost, important part #'s, just about everything you ever wanted to know about building a DEPENDABLE performance BB. --- Jer
jpclear is offline  
Reply With Quote
Old 04-22-2002, 12:19 PM
Join Date: Nov 2000
Location: Glastonbury, CT
Posts: 891

I had the same motor in my 88 donzi. I did the same cam and lifiters and with a upraded timing chain from Crane. No changes to my valves except heavy duty push rods. Also but in forged piston. It was along time ago but the motor ran great and had a very nice sound to it. Also through on a High rise and a K &N filter.
boomer is offline  
Reply With Quote
Old 04-22-2002, 12:20 PM
bsag's Avatar
Join Date: Jul 2001
Location: cambridge, md
My Boats: 27 warlock
Posts: 194

This months family & performance boating has a good article on modifying the 330. Check it out.
bsag is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
Big Block Billy
General Q & A
09-20-2009 09:35 PM
General Q & A
06-07-2006 09:03 AM
Prop Talk
09-19-2005 12:36 PM
General Boating Discussion
05-05-2005 10:21 PM
Pure Energy
General Boating Discussion
09-19-2002 05:37 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 10:43 PM.

Copyright 2011 OffShoreOnly. All rights reserved.