USMC5811

iTrader: (2)

Are these heads anygood or is anybody running them? TSP recommended them to me for my 408 but i havent heard of anyone using them....

USMC5811

iTrader: (2)

anyone?

My6speedZ

iTrader: (18)

https://ls1tech.com/forums/dynamomet...ts-01-z06.html

That's all I could find.

Rise of the Phoenix

iTrader: (27)

You won't find many dyno/track results because they are brand spanking new. Most who have bought them may not even have them yet and the ones who do have likely not had the car dyno'd or taken to the track.

USMC5811

iTrader: (2)

Good results on that Z06! Just wondering if they will outperform the CNC LS3 heads from TSP... and theyre an extra $300 bucks....

Sales4@Texas-Speed

iTrader: (4)

I think it will depend what kind of performance you want. Our CNC LS3 head move more air at peak lift but with the larger valve and runner they really give up some low end flow and port velocity. If you are looking for a bunch of top end power I would say go with the LS3 but if you are looking for a broad powerband the as cast would be better, in my opinion.

My6speedZ

iTrader: (18)

Another plus which may or may not be relevant to your future plans is the thicker deck on the PRC heads.

I myself like the low cathedral ports usually give you. Not to mention if your arent planning to buy an intake manifold right now you would have to add that into your budget if you decided to spring for the LS3 heads.

98ws6blk

Do these PRC as cast heads have the normal 15 degree valve angle?

My6speedZ

iTrader: (18)

13 degree

USMC5811

iTrader: (2)

what difference does the degree make.......

Blwn_by_Twins

iTrader: (6)

If I'm not mistaken it has something to do with clearance to run a larger cam, but I'm no expert.

USMC5811

iTrader: (2)

any other insight?

djfury05

iTrader: (30)

Yes, get the TFS 235's instead.

USMC5811

iTrader: (2)

okay. you can just paypal me the difference in the LS3's and the TFS's

djfury05

iTrader: (30)

Do it right the first time Devil.

USMC5811

iTrader: (2)

and thats my biggest worry! that somethings going to come and bite me in the *** for being a cheapass!

USMC5811

iTrader: (2)

https://ls1tech.com/forums/parts-cla...215-heads.html

https://ls1tech.com/forums/parts-cla...es-1630-a.html

either of those be a good choice? sorry i'm not very good when it comes to heads and their specs

djfury05

iTrader: (30)

With those TFS be aware that you cannot run stock rockers unless you have a conversion kit that makes it possible, which would be extra money. With the AFR's that is not a problem. With your 408 I'd prolly choose the AFR's. But the AFR's also have single beehives which I'd recommend upgrading to duals, so there's more money there as well.

Scroll down and see 99-TEA-KIT and 99-TEA-KIT2. I'd recommend the 99-TEA-KIT2 because it includes the Comp Cams trunions, unless of course you have those already. Hate to see you build a nice motor and have the rocker's needle bearings ruin it. Cheap insurance with the Comp Cams trunions.
http://www.thunderracing.com/shop-by...ylinder-Heads/

Also have to factor in compression with any head you choose and the head gasket etc. Not sure what your piston CC and TDC value is.