Trex with 243's??
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
Trex with 243's?? Alright so I have a collection of parts that are itching to go on my car, one of them being the short armed dinosaur(cam). A buddy of mine offered me a good deal on some 243 ls6 heads and brought it up to a friend of mine and told me that they might not work together because of different valve sizes. To my knowledge they have same size valves but smaller combustion chambers compared to 241 heads.
So does anybody if they would work together or not?
Also if I do get the heads, of course I'll be replacing lifters and using mls head gaskets and I already have 7.4 pushrods, will I have any issues with these pushrods? I heard for this cam you need stock size pr's but thunder racing package sells them with 7.4's?
So does anybody if they would work together or not?
Also if I do get the heads, of course I'll be replacing lifters and using mls head gaskets and I already have 7.4 pushrods, will I have any issues with these pushrods? I heard for this cam you need stock size pr's but thunder racing package sells them with 7.4's?
Always measure no matter what scenario! If me i would go ahead and flycut anyway just so i could mill the 243's to bump the compression. AI can cnc the heads to make the cam fit withput flycut i would check out his 500$ head work to get a cnc valve job and deck resurfacing and make fit your cam.
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
Well that sounds like a good idea but its not in the budget really since my t56 took a **** on wesnesday lol. If there actually is issues with the setup i may just do the cam swap and save the heads for my second gen if i decide to keep it or get them worked on later.
You can eek by with a Trex on stock 241 heads, but I wouldn't chance it with the difference in between the two.
I could spec you a custom grind that would work and be just as nasty if you like?
I could spec you a custom grind that would work and be just as nasty if you like?
This...go this route. Then you will be worry free. Martin knows his stuff!
Trending Topics
I try! I will start to post up results on the dyno from the custom cams I spec.
I will be bringing that aspect of our posting back since we haven't been really showing off our new in house tuning that we're doing now since moving locations.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
Likes: 4
with a big cam like that also consider some trunnion bearing upgrades.valve train geometry is very crucial with high rpm cams.and look at a little thicker head gasket to maybe gain some extra clearance.get some good valve springs.Damian specs a cam that makes great power .
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
In any case TREX should have PTV measured.
Originally Posted by garygnu
with a big cam like that also consider some trunnion bearing upgrades.valve train geometry is very crucial with high rpm cams.and look at a little thicker head gasket to maybe gain some extra clearance.get some good valve springs.Damian specs a cam that makes great power .
So the higher CR from the smaller chamber has no effect on PTV is what you're saying?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Correct, smaller chamber is not from milling but from design. Valve drop are the same. Valve drop is the distance the valve travels when it free drops and contact piston (from full seated position to piston at TDC without spring). This is on same motor. On different motors it could be different if piston to deck height is different.
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
I will go ahead and do the cam swap first that way i can get rid of that ls6 intake and get the heads. After i gather everything for the head swap ill give it a shot
Correct, smaller chamber is not from milling but from design. Valve drop are the same. Valve drop is the distance the valve travels when it free drops and contact piston (from full seated position to piston at TDC without spring). This is on same motor. On different motors it could be different if piston to deck height is different.
Even I don't know everything contrary to belief!!!
youll always need to measure. its going to be very tight. some people have no problem, and some people have ptv problems with stock heads and a t-rex. If it is too tight, you can always flycut a little