Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 05-02-2018, 01:46 AM
G60Gates G60Gates is offline
TT Newbie
 
Join Date: Jun 2017
Boat: 1993 mastercraft stars & stripes 19 ft.
Location: Southeast
Posts: 3
Smile 351w Head replacement

I have a 1993 19ft, stars & stripes edition boat. The motor is stock. One of the heads has a small crack in it which leaks water, not bad but constant. I bought the boat a few months ago knowing this. The previous owner said he has put JB weld on it cow 2 years and ran it. So I have a st of fresh gt 40 heads available, real cheap, so 1) will they fit, 2) what 4 bbl. intake to run, 3) will the water log exhaust work, 4) without a cam change, is it worth it, and finally 5) should I just replace the stock heads. The boat is near perfect except the crack in the head. Thanks.
Reply With Quote
  #2  
Old 05-02-2018, 02:06 AM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 17,509
Quote:
Originally Posted by G60Gates View Post
I have a 1993 19ft, stars & stripes edition boat. The motor is stock. One of the heads has a small crack in it which leaks water, not bad but constant. I bought the boat a few months ago knowing this. The previous owner said he has put JB weld on it cow 2 years and ran it. So I have a st of fresh gt 40 heads available, real cheap, so 1) will they fit, 2) what 4 bbl. intake to run, 3) will the water log exhaust work, 4) without a cam change, is it worth it, and finally 5) should I just replace the stock heads. The boat is near perfect except the crack in the head. Thanks.


1. If they are the GT-40 heads they will bolt right on. If they are GT-40P heads, you will need to drill he head bolt holes to 1/2Ē.
Most popular intake is the
2. Edelbrock Performer intake.
3. Exhaust manifolds will fit.
4. There will be gains in HP with just the heads, more if you add a cam (though this can diminish drivability), more gains if you increase compression by shaving the heads (removing material from the bottom of the head to make the combustion chamber smaller, more gains if you rebuild the engine and stroke it to 427 cubic inches.... Itís a matter of where to stop. Hours on the engine make a difference. If you have a lot of hours and change the heads and cam, you ought to consider a rebuild.
5. As you need to change heads, there is no reason not to go with the GT-40 heads unless itís a budget related thing.

Another thing to consider is your carburetor. Are you still running the Holley 4010 or have you switched to a Holley 4160?

Electronic ignition?




Sent from my iPhone using Tapatalk
__________________
CUSTOM WHEEL & TIRE PACKAGES


COSTOM DECALS - EMAIL FOR MORE INFO

$125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $325 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS $495 DELIVERED
Email - [email protected]
Reply With Quote
  #3  
Old 05-03-2018, 07:41 PM
david_ski david_ski is offline
TT Regular
 
Join Date: Jul 2005
Boat: 2003 SN196, PCM 330HP 5.7L, ZeroOff
Location: Auburn, CA
Posts: 95
Quote:
Originally Posted by thatsmrmastercraft View Post
1. If they are the GT-40 heads they will bolt right on. If they are GT-40P heads, you will need to drill he head bolt holes to 1/2Ē.
Most popular intake is the
2. Edelbrock Performer intake.
3. Exhaust manifolds will fit.
4. There will be gains in HP with just the heads, more if you add a cam (though this can diminish drivability), more gains if you increase compression by shaving the heads (removing material from the bottom of the head to make the combustion chamber smaller, more gains if you rebuild the engine and stroke it to 427 cubic inches.... Itís a matter of where to stop. Hours on the engine make a difference. If you have a lot of hours and change the heads and cam, you ought to consider a rebuild.
5. As you need to change heads, there is no reason not to go with the GT-40 heads unless itís a budget related thing.

Another thing to consider is your carburetor. Are you still running the Holley 4010 or have you switched to a Holley 4160?

Electronic ignition?




Sent from my iPhone using Tapatalk
What he said. Bolts right in.

I replaced my GT-40's (water jacket crack) with new GT-40P's (I drilled out the 1/2" bolt holes myself because engine shop forgot to).

Edelbrock Performer definitely improves HP.
Don't skip on painting it. A friend added the aluminum intake and he did not paint it. BIG mistake.

Night and Day difference between the Holley 4010 and 4160 (runs consistent hot & cold, at speed and idle).
__________________
Previous: 1993 ProStar 351HO
2003 SN196, PCM 330HP 5.7L, ZeroOff
Reply With Quote
  #4  
Old 05-03-2018, 07:51 PM
03 35th Anniversary's Avatar
03 35th Anniversary 03 35th Anniversary is offline
MC Devotee
 
Join Date: Feb 2007
Boat: Searching
Location: Midlothian, Tx.
Posts: 4,104
Quote:
Originally Posted by david_ski View Post
What he said. Bolts right in.

I replaced my GT-40's (water jacket crack) with new GT-40P's (I drilled out the 1/2" bolt holes myself because engine shop forgot to).

Edelbrock Performer definitely improves HP.
Don't skip on painting it. A friend added the aluminum intake and he did not paint it. BIG mistake.

Night and Day difference between the Holley 4010 and 4160 (runs consistent hot & cold, at speed and idle).
Why would you paint Aluminum Parts??? It defeats the purpose of using Aluminum Parts...
Reply With Quote
  #5  
Old 05-03-2018, 07:53 PM
waterlogged882 waterlogged882 is offline
MC Master Poster
 
Join Date: Dec 2004
Boat: 93 190
Location: lake
Posts: 12,363
Unpainted..... my preference...Nothing BIG about paint one way or the other.

I like the Edelbrock OEM contrast.

.
Attached Images
 
__________________
John 14:6
Reply With Quote
  #6  
Old 05-03-2018, 11:31 PM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 17,509
If you want the bare aluminum look, but not the hassle of keeping it looking clean, use a high heat clear coat prior to installation.


Sent from my iPhone using Tapatalk
__________________
CUSTOM WHEEL & TIRE PACKAGES


COSTOM DECALS - EMAIL FOR MORE INFO

$125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $325 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS $495 DELIVERED
Email - [email protected]
Reply With Quote
  #7  
Old 05-04-2018, 08:06 AM
03 35th Anniversary's Avatar
03 35th Anniversary 03 35th Anniversary is offline
MC Devotee
 
Join Date: Feb 2007
Boat: Searching
Location: Midlothian, Tx.
Posts: 4,104
Quote:
Originally Posted by thatsmrmastercraft View Post
If you want the bare aluminum look, but not the hassle of keeping it looking clean, use a high heat clear coat prior to installation.


Sent from my iPhone using Tapatalk
Coating aluminum parts with anything hinders their ability to expel heat. Not that it would be a big deal either way in this application.
Reply With Quote
  #8  
Old 05-04-2018, 10:23 AM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 17,509
Quote:
Originally Posted by 03 35th Anniversary View Post
Coating aluminum parts with anything hinders their ability to expel heat. Not that it would be a big deal either way in this application.


Agreed on both counts.


Sent from my iPhone using Tapatalk
__________________
CUSTOM WHEEL & TIRE PACKAGES


COSTOM DECALS - EMAIL FOR MORE INFO

$125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $325 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS $495 DELIVERED
Email - [email protected]
Reply With Quote
Reply

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 12:13 PM.


2018