xRaTeD

update..

A.R. Shale Targa

iTrader: (2)

So you went to the big shin-dig @ Elkhart Lake??? Bet you don't remember
the one stoplight at the top of the hill in Fredonia...gas station/Mc D's/etc.
What a busling farm town I live in....
Really nice job on the port work BTW.....RonSS as well...from someone who's
ported more than a hundred sets of heads I can see the level of meticulous
patience you both have.....major props !!!!

xRaTeD

I love Elkhart lake we had a house on crystal lake I think it was called.. Had a gondola ride down the stairs I kept telling everyone I'd move there but they advised me to come back on winter..lol

TT427

iTrader: (1)

Anyone know what the min guide length should be? I have read somewhere that 2 inches on a 11/32 valve. I have also seen guys grind almost the entire valve guide out. Any experimentation with this, 7mm valves, or using bigger valve combos like a 2.02/1.57, or 2.00/1.60? Only ask because sometimes the low lift can benefit, like a vortec head, the port stalls around .550 but the avg can go up.

A.R. Shale Targa

iTrader: (2)

The shorter the guide the more valve deflection hence less life expectancy.
I just did some 7mm Manley valve stuff and the bronze guides that they sell
were right around 2.25" in length.

xRaTeD

I would say the porting is the cheap and easy part the seat and guide work is the expensive part.. There is no point in improving flow if the valve can't seat properly you force the cylinder with air and the blow it past the seats cause the valve guides wear faster. It's like adding more ring gap for less frictional loss but you lose power blowing it
Past the rings

RonSSNova

iTrader: (3)

You are being way to kind to me....but thanks!

Ron

RonSSNova

iTrader: (3)

So how is set dos coming along? Got any words of wisdom on the exh port?
How about the valve job details?

Ron

TEDSgrad

Yes, this area is beautiful. This weekend is SCCA Nat'l runoffs. It's a wide range from Pinewood Derby to full blown Indy cars.

DoggyB22

iTrader: (2)

Amazing work man! Cant wait to see mine

DoggyB22

iTrader: (2)

Polished heads ****

xRaTeD

Yeah I have a set dos is in las vegas now already on the car.. lol ..Doggyb22 heads are probably the best to date 222 cc int 86 exhaust .. I was able to improve the mid range numbers while still making 7 more cfm at .600 which was 210 cfm on 83 cc's the factory bowl works nicer then a hogged out round bowl.. I think its safe to say the shape of the factory port is not too bad and less is more ..

RonSSNova

iTrader: (3)

I can just melt mine for the alum scrap now

xRaTeD

Yours looks good just slAp them on an run em

RonSSNova

iTrader: (3)

Picked up by the recycle truck this morning.......
Kidding.

So here is the final exh port. I raised the exit 1/8", blended back to the guide.

Since these won't see a flow bench, who knows if it helps.







Now ready for the valve job

Ron

RonSSNova

iTrader: (3)

Heads are with the machinist for the VJ. He had a couple of suggestions, like rougher intake port finish, but otherwise liked my work. He will do a 4 angle with the Serdi

Ron

Kory 88Iroc Lt1

iTrader: (7)

great info. I hope to start a set of heads soon. Thanks for sharing the info.
Kory

xRaTeD

Ron do you have a photo with the gasket over you exhaust port ? it almost looks like you port matched the upper half of the port ?

RonSSNova

iTrader: (3)

First I bolted the exh manifold on and scribed it's port shape on the head. A bit tricky, takes a hook shaped scribe.
Then laid the gasket on the head, manifold port is much larger than the gasket, so I scribed the gasket shape on the head. I enlarged only the top of the port to about .050" short of the gasket scribe line.
I know rat motors like the exh port raised at the roof exit. Does it apply here? Not sure!

My guy is going to do a radius type cut on the exh seat.

BTW....manifold because these are going on my 5.3 turbo engine.
I think you should try this on a junk head and see how good, or bad it flows!

Ron

xRaTeD

Got a chance to work on another edlebrock crappy pics though..