I called a couple of local machine shops today and got prices from $500-2000 to rework my stock 113 heads.

I also called Summit who said they would have the heads worked and put in new valves, retainers, springs, pushrods.

I was looking through the summit catalog and came across some heads by Dart, Cast Iron Heads.


They are $675.90 and have several different size chambers, located on page 145 of the new catalog.

The couple I am looking at are:

drt-10510020p+ which are 215cc 64cc 2.05"/1.60" with the angle plugs.

another option would be 200cc with 2.02"/1.60"

Looks like they come with everything except gaskets and pushrods, so I would have to look to see which pushrods I would need to go with.

Anyont have any thoughts on going with a head like that? Keeping the stock lower manifold put getting it port matched along with the runners?

Which pushrods would you go with?

 

Your going to hurt your compression ratio switching from 58cc chambers (stock 113) to 64cc chambers (Dart).

Depending on what head it is. Some of Darts cast iron stuff is pretty good out of the box (Platinum series) but some of it requires a lot of work (everything else) to make right.

You can only determine pushrod lenght by checking rocker geometry. As for what brand the Trick Flow .080 pushrods are good parts for less than $90.00.
Will

 

your pistons are dished to compensate for the 58cc heads on your car now. If you go to 64cc, you might be right at 9.1:1. pretty poor for aluminum heads. If you buy the cast iron heads, you can have them milled a little to get maybe 9.4:1, and use thinner head gaskets. But don't go past 9.5:1 with iron. The engine will knock the rod bearings out of it because of the detonation.
Chevy High Performance magazine guru kevin mclelland has made mention in the past of porting the 113 head, and getting substantial gains. you just have to stick with dished pistons.
If these heads were junk, why would the ZZ series engines sold today right from Chevrolet have those heads on it? you can claim zz3 heads........
I think you could have larger valves installed in them, do a 3 angle valve job, and a mild pocket port, add a nice set of springs, and end up with killer heads.
It's gotta be substantially less than $1200. Right?
New 113 heads are $625 each, assembled. so you already have $1100 heads, just maximize them.
I cleaned up the ports in my 113 heads, and the car pulls substantially more torque longer......... just my 2c worth. and by the way, I bought them for $125 each used. oh, and, I had to seriously retard the timing, and when I mash it from idle, the knock sensor pulls the timing back so I have to ease into it initially,....... then hammer it. but my gas mileage is waaaay up there with flat top pistons and 58cc heads......32 highway, 23 average.....

 

http://forums.corvetteforum.com/show....php?t=1935034

Some light reading that could help.

 

Sounds like I might be sticking with my 113 and just dropping them off at the machine shop for some work.

Hopefully they are not warped, previous owner thought either head gaskets or warped heads. I did not see anything wrong with the gaskets.

 

ALL castings change shape to some degree as they become "seasoned"...generally accepted "seasoning" period is 50 heat cycles for cast iron and double that for alum...once seasoned, a casting becomes relatively stable unless subjected to a substantially different temperature flux...a "light" cut on any seasoned head is desireable and produces a better part than a new (green) casting, and also removes imperfections caused by the movement of an alum head on an iron case (cyl block) due to thermal expansion/shrink at every heat cycle.

 

I would make sure to get aluminum. $2000 to have work done to the L-98 heads? What were they going to do for $2000?

 

It sound like you have decided to stick with your stock heads, I think that is the rite choice.

If you are thinking of changing keep this in mind, your stock heads are about 163 cc intake port volume, the stock intake will fit a little bigger volume but it will not fit most if any 200cc heads, to run 200 or bigger you would have to have an intake to fit, usually a carb intake.(someone correct me if I am wrong).

I have been looking into this a lot lately and If I had the 113 on mine I would have them ported and maybe increase the valve size, if I didn't go that rout I would get 170cc Edelbrock's or Summits new Alum 170 cc heads.

My .02 worth

Joe

 

Summits heads are $999 a pair and won't kill your compression. If your current heads are in decent shape you can get $300 - $400 for them. Throw on some 1.6 full RR's and your performance will improve noticeably.

 

Arent the "Summit heads" made by Canfield or am I thinking of someone else?

 

JEGS house brand heads are cast by Canfield.
Will

 

Shop told me $500 to port and work the heads, another $100 labor to open them up for 2.02 valves. The valves would cost me $10 each then my springs, retainers, pushrods, and locks.

I was going to take them over today, but just did not get to it.

I am still debating about just having the heads ported and leaving the stock sizing in place and putting in some new springs (stockers have 176k miles) and pushrods etc. At that point I would just have the valves cleaned well and put back in.

The shop said they would port match the lower intake to the heads for no extra cost but it would cost be another $500 to have it completly ported.

 

Ah, thanks for the correction.

 

I don't think the shop you are talking to knows that the 113 heads will require bigger seats installed to use valves bigger than 2.0" and 1.56"

It would cost alot more than 1 bill to install 16 new seats. IMO he is quoting you for just a 3angle valve job.

Also nothing wrong the 2.0/1.56 valve combo on the 113 castings. Its an easy upgrade and properly ported 113's with this size valves will surpass 250-260CFM on the intakes.
Will

 

i got a set of AFR's for sale..

 

I heard Trickflow made the Summit heads.

 

I heard yours were made by Brodix

 

My .02 worth

Buy the new 64cc aluminum heads now and live with the lower compression until you can rebuild the motor and put flat tops in. Did not mention how many miles are on the short block.

The quality of gasoline is not going to get better until we get E85? more available. And with the price of gas, being able to use regular might not be so bad.

 

at 176k, DEFINITELY will need new valve guides and valves...worn guides alone will prevent valves from seating properly (resulting in huge power loss) and flexing of valves as they land off-center will lead to early catastrophic engine damage (aka dropped valve)..."high mileage" valves will have stem wear that will prevent installation into a properly sized valve guide and also have experienced extensive "stem flex", with metal fatigue and resultant stem failure imminent.

cost of repair exceeds replacement cost (totalled)

 

No way would I spend a bunch of money on heads with 176K.