high compression questions
On The Tree
Joined: Feb 2007
Posts: 158
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I am looking at these heads as well for my boosted ls. They look like they have ports that are bigger than Hooker's giner after 10 kids. Bet they sound like a tugboat horn too if ya throw a lil compressed air accrossed them too.
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Forget fly cutting if you’re using OEM Hypereutectic pistons. Let’s see, you’re going to cut into already weak pistons making making them even weaker, they have no reinforcement under them for reliefs. I know there are people that do it but it’s NOT the way to go. Get 11 degree pistons if you’re using 11 degree heads and not worry about it. 11.5-12:1 is not hi compression, it’s moderate, 14:1-17:1 is high compression
Thread Starter
Teching In
Joined: Oct 2020
Posts: 38
Likes: 6
From: Kentucky
Forget fly cutting if you’re using OEM Hypereutectic pistons. Let’s see, you’re going to cut into already weak pistons making making them even weaker, they have no reinforcement under them for reliefs. I know there are people that do it but it’s NOT the way to go. Get 11 degree pistons if you’re using 11 degree heads and not worry about it. 11.5-12:1 is not hi compression, it’s moderate, 14:1-17:1 is high compression
TECH Enthusiast
Joined: Mar 2005
Posts: 663
Likes: 384
From: South Carolina
I also have the PRC 225 heads with 62cc chambers .660" springs, flat tops with no flycut, 231/234 .629" .615" 111*
The PRC heads can use factory rocker arms while the TFS will need rollers if I recall correctly.
Nice pieces IMO
The PRC heads can use factory rocker arms while the TFS will need rollers if I recall correctly.
Nice pieces IMO
Thread Starter
Teching In
Joined: Oct 2020
Posts: 38
Likes: 6
From: Kentucky
I believe I'll go with the PRCs with hollow stem intake valves, most of my stuff is TSP might as well go all the way
TECH Enthusiast
Joined: Mar 2005
Posts: 663
Likes: 384
From: South Carolina
I have the "Virus" edition heads lol 
During the first round of stimulus TSP had them discounted 10%...
also bought the camshaft for only $300
To bad they're not having a sale this go round of stimuli
Attachment 712430
During the first round of stimulus TSP had them discounted 10%...
also bought the camshaft for only $300
To bad they're not having a sale this go round of stimuli
Attachment 712430
Thread Starter
Teching In
Joined: Oct 2020
Posts: 38
Likes: 6
From: Kentucky
Oh wow that's wild, I missed that one. I wound up buying my cam and most of my stuff when they were doing black friday
TECH Enthusiast
Joined: Feb 2018
Posts: 644
Likes: 300
From: Michigan
The TFS 220 can be had from BTR or Tick with powdered metal guides which will allow you to use factory rockers. That said, I went with PRC 225s and I'm very happy with them. The car got a lot faster.
there's a ton of people who have fly cut stock pistons with no ill effects, and I've seen a couple threads that illustrate that a lot of material can safely be taken out on an NA motor. I'm wanting a higher compression (higher in respects to most of the cars running around) street car that could be driven anywhere without worrying about e85 or race gas.
Thread Starter
Teching In
Joined: Oct 2020
Posts: 38
Likes: 6
From: Kentucky
