19Beast90

Hey guys i found a nice pair of heads that have been ported and polished. He said they would only fit 88-90? I have a 86. They are set for a hydrolic roller. Can they work with my L98 i have the late 86 motor with aluminum heads... If so is 475 a good price? Im about 5hrs from him. My goal is to have over 300rwhp...
thanks
kevin

convas

My 86 has them and they work fine, they were already on the car when I bought it so not sure of any issues fitting them.

USAsOnlyWay

Yeah they'll work but you'll have to check and probably change rocker arms, guide plates and pushrods which if you are putting on ported heads no reason not to run full rockers at the same time.

As long as he porting is good and they are straight and have not been cut in such a way your manifold won't fit you should be fine. Does he have a flow sheet? Who did the porting?

IIRC ported 113s can hit 260's cfm at 28" h2o on the intake and stock is around 200. If it is around 280 and all the valves, guides and etc are good it should be a pretty good deal. Double that price and you can start looking aftermarket heads.

EDIT: To update flows:
Stock 196
Tpis ported 263
Others 240

GREGGPENN

Ported 113's can get to 260ish. Stock is actually below 200cfm. TPIS-ported 113's will perform as well as AFR Eliminators under a large-tube TPI intake. Probably as well under a short-runner intake.

That's why the quality of porting is good to know.

USAsOnlyWay

There ya go. I had a set of 113s and ended up never bolting em on. I couldn't remember if that was right or not, sounded high but with 300cfm heads now it sounds low...

More reason for a flow sheet and to consider what aftermarket heads can give you for a few bucks more.

19Beast90

Ok thanks i will look more into them. I was going to put 1.5rr's on. Seems like these heads would work good for my goal then? 300+rwhp

USAsOnlyWay

Depending on the flow it could be easy or it could be just barely there.

Forum member Joe90 I think has one of the strongest running 113 SBCs there at 400hp. http://temp.corvetteforum.net/c4/joe90/index8.shtml

I'm sure others who actually run the head currently can comment and give you more info.

Davejs

Can you find out who did the work on the heads? I had a set of heads that were "ported" and wound up spending another $350 getting them fixed. Then again I will not run a set of new heads without having them checked first. Flow #s are only a small portion of what it takes so dn't let it fool you. Have them checked and touched up a bit so when you start it up there are so unwanted suprises for you.

THE 383 admiral

You are going to need much more then 113 heads and 1.5 rockers to gain 160 HP over stock
To make 300+ rwhp.....

leesvet

If this is a DIY P&P job...RUN

Porting is more than grinding away casting ridges and making passages larger. Its balancing runner volume and creating equal flow thru all passages.

Polishing is also a concern. Unless you're buring nitro or alcohol there is NO advantage to a hi-polish in gas heads. Rule of thumb....the runner passages should be about the same texture as a striker pad on a box of matches.No smoother.
Polished inerds do not help,especially where gas has already been atomized and mixed with air.
They can hurt the necessary turbulance that mixes the fuel/air as it travels. Boundry layer dynamics often negate any enlarging/smoothing effects.

So, get some documentation before throwing any money out there. DIY porting has destroyed more heads than you can imagine.

DIY Port matching is one thing...full porting is another. Heads have to be CC'd, runner vol checked, flowed...lots involved.

cv67

w/leesvet

Without a flowsheet you cant really tell whats been done or what ya got.
unfortunately there are professinals out there that dont provide this and sell a golden rainbo. Knowing cc size helps
People foam at th emouth over a shiny port and assume..... more to it than meets the eye.

Cant expect the world for under $500 but good to know as much as you can before you part with your hard earned cash.

Checking flatness, pressure check, valve job guides etc should also be done as said above. Minimal cost to have looked over but worth it.