My buddy has a set of tsp 2.5 862 casting number heads. They are about 5 years old with PAC 1518 springs .660 lift. The heads have been on a tsp 408 with an sts rearmount and a ls1 tsp 220 cam. He currently put the ls1 back to stock all the way down to the cam. Heads have about 10k miles on them. They worth $500? Have a couple broke manifold bolts.

Thanks,
Steve

 

What would you be putting them on? I seriously wonder if larger heads will benefit the bore of a 5.3. I do think they are worth $500, but think the money might be better spent in other places.

 

Absolutely, theyre good heads, especially for what you can get them for. Be a good time to throw that cam in with some fresh lifters. A new top end ought make that 5.3 sing pretty good. A NNBS intake would complete the setup. Should be good for 70-80hp maybe a little more if you get the heads milled to bump the CR up a bit more.

 

They are still 61.15cc. If I buy them im gonna take them to our local (husband and wife) run it machine shop. They've been in business 20+ years. I'll have them do a valve job and remove the broke bolts. A .030 mill should make them around 58cc correct?

 

Get them, have the valve job done, clean them up. Might do a set of valve springs depending on How many miles on them.

 

I think .020" mill is closer to 58cc.

 

They'll be going on my 5.3. When I order my cam from stock48 I'm gonna get the isky valve springs also. Ls7 lifters or a set of stockers? Jarret says stock push rods are fine, but if I have the heads milled .030 push rod length is gonna depend on which lifter I go with correct?

 

Stock pushrods are wimpy and act like spaghetti at higher rpm.

 

Jarret uses stockers on his 9 sec turbo'd 6.0 truck fwiw..

 

Answered my own question with the search feature! Ls7 lifters are now the stock replacement! How much do you guys recommend milling the heads? It's a lm7.