10:1 cr sbc
#11
Registered

Joined: Nov 2004
Posts: 14,154
Likes: 3,714
From: On A Dirt Floor
Skip White parts aren’t the most of money
#12
Registered

Joined: Jan 2007
Posts: 2,091
Likes: 1,214
From: Murrayville Georgia
I know about the Skip White stuff just saying that for a motor that he says is going to run idle to 3k most of its life he could just drop a nice running used package in it and go. seems like a lot of work and money for a motor that will never get used for what it is capable of.
#13
Thread Starter
Registered
Joined: Jul 2025
Posts: 35
Likes: 3
Not a dumb question at all...I literally have a set of Wuhan vortec heads on the boat currently...1.94/ 1.5 valves mild port job..They work fine..I would love to use them again...Everyone doing engines wants to do them like a car with 10:1 or 10:5 compression...using forged pistons...I kinda want hypereutectic at like 9.7 ...thx...
#14
Registered


Joined: Aug 2019
Posts: 1,250
Likes: 420
From: BC
Not a dumb question at all...I literally have a set of Wuhan vortec heads on the boat currently...1.94/ 1.5 valves mild port job..They work fine..I would love to use them again...Everyone doing engines wants to do them like a car with 10:1 or 10:5 compression...using forged pistons...I kinda want hypereutectic at like 9.7 ...thx...
Doing a set of aftermarket aluminum heads may seem to be a soljtion on paper, but they should be gone through for marine duty, so your cost benefit vs rebuild mild port cleanup on the Vortecs isn't as substantial.
10:1 for Aluminum with modern chambers and a proper cam with some duration is not an issue. Don't over time the ignition, and don't retard it much either. Retarded engines heat up the exhaust valve, and the heads/manifolds. Makes detonation much more likely.
Make sure you get a good grip of the oil temps.
I ran a 355 SBC at 10:1 with iron RHS Pro-Torker heads. 1.94 Vortec copies. No drama, kept max timing at 30°.
Pushed a 20ft Reinell to 55mph. I think the 670 VS carb and the 202° @ 0.050" FT cam choked out at 5500rpm. Not bad for such a small cam, and 10:1.
Last edited by Tartilla; 09-05-2025 at 08:32 PM.
#15
Registered

Joined: Nov 2004
Posts: 14,154
Likes: 3,714
From: On A Dirt Floor
20ft monterey
5 billion hr 1991 350 mag shortblock
Brodix 180IK heads
comp xfi 218/224 113lsa hyd roller
eddie exhaust manifolds
weiand air strike intake
bg 650 vac sec carb
alpha ss drive
72.8 mph
5 billion hr 1991 350 mag shortblock
Brodix 180IK heads
comp xfi 218/224 113lsa hyd roller
eddie exhaust manifolds
weiand air strike intake
bg 650 vac sec carb
alpha ss drive
72.8 mph

#17
Registered

Joined: Mar 2007
Posts: 357
Likes: 24
From: Your moms
#18
Registered

Joined: Nov 2004
Posts: 14,154
Likes: 3,714
From: On A Dirt Floor




