.660 vs .625
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
.660 vs .625 My new heads came with .625 beehives; my old ones have BRT .660 dual springs with minimal use.
Should I swap the beehives for the duals?
My cam is .617/.592
Thanks guys for your experience and knowledge.
PS the heads are 243's from a shop in California I am gonna have a local shop port them...
Should I swap the beehives for the duals?
My cam is .617/.592
Thanks guys for your experience and knowledge.
PS the heads are 243's from a shop in California I am gonna have a local shop port them...
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
Stick with the PSIs.
With only .592" of lift on the exhaust, I wouldn't be looking at a .660" spring. If you truly wanted a dual spring instead of a beehive, I would be looking at doing the BTR .630" spring on the intakes and finding a .600" spring with similar pressures for the exhaust.
But again, I would stick with the PSI beehives.
With only .592" of lift on the exhaust, I wouldn't be looking at a .660" spring. If you truly wanted a dual spring instead of a beehive, I would be looking at doing the BTR .630" spring on the intakes and finding a .600" spring with similar pressures for the exhaust.
But again, I would stick with the PSI beehives.
Trending Topics
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 Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
10 Second Club
Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
But to assume the spring set-up from one build, then just use on another build without checking...asking for trouble IMO
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
10 Second Club
Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
You didn't...but looking at OP's post about using heads "from some shop" set up with .625's... cautions need addressed. All I'm saying.
I would never just use a set of heads without checking everything...**** happens
I would never just use a set of heads without checking everything...**** happens
My new heads came with .625 beehives; my old ones have BRT .660 dual springs with minimal use.
Should I swap the beehives for the duals?
My cam is .617/.592
Thanks guys for your experience and knowledge.
PS the heads are 243's from a shop in California I am gonna have a local shop port them...
Should I swap the beehives for the duals?
My cam is .617/.592
Thanks guys for your experience and knowledge.
PS the heads are 243's from a shop in California I am gonna have a local shop port them...
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,615
From: Central Cal.
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
I agree that "trust but verify" is the best course of action. Since he is having the heads ported, he can use a micrometer and install the springs himself once the port work is done.
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
… I will have the porting shop verify everything . BTR sells the cam eith the .660 springs so it seemed to me that I may need that extra pressure , but based on what many people
are saying Looks like sticking with the .625’s is fine…
are saying Looks like sticking with the .625’s is fine…
TECH Regular
Joined: May 2023
Posts: 417
Likes: 138
From: Franconia, PA
From everything I read, use the beehives. The less stress/pressure on the valvetrain, the better.