Boats For Sale:
Holley 450 vs. 600 |
Post Reply 
|
| Author | |
Jim_In_Houston 
Guest 
|
 Post Options
 Thanks(0)
 Quote Reply
 Topic: Holley 450 vs. 600Posted: July-14-2005 at 10:23am |
|
I have had vacuum leaks when using new Mr. Gasket carb gaskets. A Fel-Pro cured the problem.
|
|
 |
|
|
Bob's2001
Senior Member 
Joined: March-28-2005 Location: Lake Jackson TX Status: Offline Points: 241 |
Post Options
Thanks(0)
Quote Reply
Posted: July-12-2005 at 2:35am |
|
Glad you had a good day. It took me a week to figure that out! Now if I can get a little time off work I'll go burn some gas myself
|
|
|
Bob Ed
83 2001 |
|
|
|
|
stang72
Platinum Member 
Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
Post Options
Thanks(0)
Quote Reply
Posted: July-10-2005 at 2:47am |
|
Ran it on the lake today( all day)...burned a tank of gas and it ran great...started easy every time. Bob Ed...you were right on the money! Even the idle is where it should be!!!!!
Smooth @ 600 RPM's....Happy camper I am (well if I camped much that is). 
Thanks! Gary |
|
|
|
|
stang72
Platinum Member
Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
Post Options
Thanks(0)
Quote Reply
Posted: July-09-2005 at 1:59pm |
|
Looked again for vacuume leaks at the gasket(carb base)...sucked a fair share of cig smoke...theres air moving!Plugged the leak for a moment and my idle dropped..it fired right up each time...that gasket is not wide enough!
Big thanks! case solved!Damn those simple things should be checked first! (hold on a sec...door bell)UPS!!!!Dis inboard marine!!!!Parts! new ei ingnition!!! Gotta go! Gary 
|
|
|
|
|
stang72
Platinum Member
Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
Post Options
Thanks(0)
Quote Reply
Posted: July-08-2005 at 4:34am |
|
Oh great! Burning excess fuel with todays gas prices...ouch!
 So the 450 is a better choice I take it.How big a difference is there?
Anyone want to swap me? This week end a buddy is going to tune her up and add some new ignition parts(very needed)...and we can see how it runs! If it's not all there..then I am going to be wondering...450 ???? and if I am lucky...maybe he will have a vaccume gauge too! 
Thanks GH |
|
|
|
|
nms1991
Groupie 
Joined: May-31-2004 Location: United States Status: Offline Points: 46 |
Post Options
Thanks(0)
Quote Reply
Posted: July-08-2005 at 1:06am |
|
You are over carbed you will posssibly run rich at mid to wot and burn excess fuel. PCM normally used a 450 cfm carb on the 302 and it performed perfect as long as the other systems were in good shape. And there are a lot of boats running great out there without the wedge plate and a holley carb, but the weber/edelbrock/carter carb does need one on the older motors that are on a severe angle.
|
|
|
|
|
pmt2234
Groupie
Joined: June-14-2005 Location: United States Status: Offline Points: 46 |
Post Options
Thanks(0)
Quote Reply
Posted: July-07-2005 at 4:02pm |
|
Maybe try using a vacuum gauge to set your idle mixture for maximum vacuum. When I switched from the ear method to the vacuum gauge method on my 84 2001 w/ a 351W, 600cfm Holley and a wedge plate, my in and out of gear idle was vastly improved. Now going in or out of gear hardly changes my engine rpm.
|
|
|
|
|
stang72
Platinum Member
Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
Post Options
Thanks(0)
Quote Reply
Posted: July-07-2005 at 11:34am |
|
Yep...did had a gasket leak...better now...not quite there! I need to check for other leaks...pcv valve etc.
Thanks! |
|
|
|
|
Bob's2001
Senior Member
Joined: March-28-2005 Location: Lake Jackson TX Status: Offline Points: 241 |
Post Options
Thanks(0)
Quote Reply
Posted: July-05-2005 at 2:47am |
|
I had a similar problem after carb rebuild. The base gasket was not wide enough and allowed a vacuum leak between carb base and manifold.It looked wide enough but after starting up it would suck air. It was Mr Gasket for Holley. A new wider gasket cured the hard start and dying problem. You should be able to run a 600cfm carb on a 302
|
|
|
Bob Ed
83 2001 |
|
|
|
|
stang72
Platinum Member
Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
Post Options
Thanks(0)
Quote Reply
Posted: July-04-2005 at 6:51pm |
|
Have a question for the holley guy's.On the 4160 models...should I be using 450 cfm or 600 cfm..1972 ford 302? I believe mine is a 600 (remanufactured from allcarbs)recent purchase..I can't seem to get it set up right.Float levels look good. I adjust the screws back to where the engine surges(lean) and than turn them out to where it sounds good...set the idle @600-700 rpms in neutral..it wants to die when putting in gear and is hard starting.It is beginning to PISS me off!!!
What is the difference between the two??? I have a 600cfm on my other boat...351 ford and if performs like a champ! And of course...before someone throws it out there..no , I don't have a wedge plate on either boat!!! Thanks Gary |
|
|
|
|
Post Reply
|
|
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options