TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

World 042750 heads

Old Dec 20, 2020 | 12:33 PM
  #1  
George Klass's Avatar
Thread Starter
Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2017
Posts: 306
Likes: 49
From: Montreal
Car: 1989 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42
World 042750 heads

Got these off a running car for free.

They are 042750-1
*Heads use a 1.250 diameter spring. Seat pressure 100 lbs. @ 1.825

https://www.summitracing.com/parts/WRL-042750-1

My car needs valve seals (gotten bad lately) and I'm starting to suspect might have a head gasket issue. The overflow is always almost empty and noticed many bubbles when filling the rad after a coolant flush. The oil is clean tho.

I've made the executive decision to keep this car as a cruiser/nice day daily so won't be spending any money on performance just maintenance.

My plan is to have these heads checked/cleaned up/freshened and just slap them on. Stock cam and rockers. Besides some minor tuning they should be good to go?

Thanks


Reply
Old Dec 20, 2020 | 04:18 PM
  #2  
NoEmissions84TA's Avatar
Supreme Member
5 Year Member
Liked
Loved
Community Favorite
iTrader: (1)
 
Joined: Feb 2017
Posts: 4,180
Likes: 574
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: World 042750 heads

Originally Posted by George Klass
I've made the executive decision to keep this car as a cruiser/nice day daily so won't be spending any money on performance just maintenance.
My plan is to have these heads checked/cleaned up/freshened and just slap them on. Stock cam and rockers. Besides some minor tuning they should be good to go?
Thanks

Yes, have them overhauled and replace the springs if necessary. But now would be the perfect time to upgrade your camshaft. Those heads are already set up with screw-in studs and with an installed height of 1.825", there should be no problem running a valve lift of .500" or more. If you are comfortable enough to do it, smooth out the sharp edges left from the cutters under the valves in the bowl areas. Don't screw this up by choosing a too thick head gasket that will kill your quench. Shoot for .040-.045".
BTW, these heads have the large 1.94/1.50 valves (for a 305), but their stem locations are shifted so that valve shrouding to the bore is reduced.

Last edited by NoEmissions84TA; Dec 20, 2020 at 04:35 PM.
Reply
Old Dec 20, 2020 | 05:26 PM
  #3  
George Klass's Avatar
Thread Starter
Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2017
Posts: 306
Likes: 49
From: Montreal
Car: 1989 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42
Re: World 042750 heads

I haven't ruled out the cam 100% (more like 80% lol) My plan was to run an LT1 cam if I do it. Also want to be able to tune it relatively easily. I've really just come to enjoy the car in it's anemic form lol.
Reply
Old Dec 21, 2020 | 09:25 PM
  #4  
dmccain's Avatar
Supreme Member
10 Year Member
Liked
Loved
Community Favorite
iTrader: (2)
 
Joined: Mar 2014
Posts: 4,553
Likes: 806
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: World 042750 heads

I have an extra #049 GM L98 cam that would work great with your setup and easy to tune. Probably wouldn't even have to have one. PM me if you're interested.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
soupman
Engine/Drivetrain/Suspension Parts for Sale
2
Apr 29, 2020 08:02 PM
rwstegne
TPI
4
Jun 1, 2013 02:58 PM
psiscorpian
Cooling
10
Apr 4, 2009 02:22 AM
firstfirebird
V6
6
Jun 7, 2008 11:48 PM
RSRagtop
Tech / General Engine
4
Jan 3, 2002 09:46 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 05:08 AM.