Got them today from Summit Assembled with the K1 kit. They look Sweet!

 

2

 

3


They look very good. I compaired them to my 416s and wow. Pretty. I just wonder now if I need longer pushrods since the Pro head looks taller than the 416....

 

And for the 4th pic, a linked picture compairing the height of my old 416s to the Pro 200cc

 

Wow. Those look hot Pauly. With the HSR and those heads your IROC will be kicking some buttskie.

-Schultzy

 

I had no idea that heads varied in height.

 

I just put the 200cc cast's in. I struggled with the pushrod dilema. I bought .100 longer pushrods to equal the .100 longer valves, and it threw it off. The stock length pushrods are what i'm using, and the rocker stays pretty centered on the valve stem.

292 dur. hydraulic flat tappet cam, 1.6's, k1 kit.

 

Thicker decks.

 

buy a pushrod length checker and check it, i ended up using .200 shorter pushrod than what I thought, comp cams recomended a 7.30in for my retro cam and then .100 longer for the protopline heads=7.40in, wrong, 7.4 was so far off, after checking 7.2 is what I needed. I have the 220cc ProTopline's. I only had to move one guideplate so the pushrod wouldn't hit. Guess I was lucky.

Jason

 

Thicker deck is right. These 64cc heads can be milled to like 47cc or something crazy like that.

Deck height, head gasket thickness, and cam lift has play in what pushrod length, so I've read.

Right now with my old 416s I was using a 7.794" pushrod which sounds like it would be alot bigger than what you guys are using. Though according to Comp there are 3 ways to measure a pushrod and I have no idea how Summit Racing measure's theirs, but when I bought them it said stock length 7.794" long pushrods.

Guess/check/compare I guess.

 

https://www.thirdgen.org/techbb2/sho...3&goto=newpost

hope this helps, this is how I checked mine.

 

Are you guys using flat or raised guideplates?

 

flat guide plates

 

Twilightoptics

Did the Summit assemblies come with guide plates and studs?

Jeff

 

Another good thing about the raised heads is you don't have to use a super thick valve cover gasket to clear some intake manifolds.

Jason

 

i got a set of those on my car but the 220cc runners .....i didnt even have a clue they where higher.they work awsome for me.car runs 12s with full exhaust

 

The summit assemblies did come with studs and guideplates However, since I had such trouble with summit in ordering them (originally ordered the 180cc heads and the dates were moved back a month) they may have just thrown them in for me.

Call to be sure. It was like $850ish with the K1 kit. IT's NOT assembled by summit, they are assembled by Pro Topline themselves.

 

paul, what kind of problems did you have in ordering them?

 

Summit told me the 180cc were back ordered and would ship on the 6th of July (Ordered 20th of june).... then the date was moved to the something like the 11th, then the 9th, then the 19th, then August 4th...

so I called them and they said they had no idea what was going on, but they could get them to their facility 6 weeks from then, which was now like the 20th of July..... because they had to be shipped from New Zealand/Australia and it takes that long.

So I opted to go with the 200cc heads which I had a week later. The 180cc heads according to Pro, out flow the 200's by 5 then 8 then 15 then 7 then 2 then -4 then -8

At lifts .1, .2, .3, etc. So after a .5 lift the 200cc flow alot better. With the HSR I am going with the 200cc's volume will more than make up for anything.

Desktop Dyno showed no difference in the 2 when entering their flow numbers.

 

Got to putting my headers back on today as well as some more buttoning up and some HSR test fits.

With the thicker deck of the Pro's my Hedman headers (Which were a breeze to install/remove with the old GM heads) wouldn't slide right in with the Pros. On the passenger side I had to unbolt the hard coolant line (For those of us who have or used to have an engine oil cooler) and on the drivers side I had to jack the block up. No big deal, but definatly a little disapointing. Other than that everything else bolted up perfectly.

The AIR pipes that go behind the block, the powersteering brackets, SWEET.

Now I'm just waiting to check pushrod size and order some pushrods and the last 4 fuel line fittings I need!

 

I too am using stock length pushrods after my pro topline 180cc swap. My +.100 pushrods I used until I checked it caused to rockers to hit my retainers.