LAFireboyd

iTrader: (3)

There's been a large thread about these heads in the past where a lot of interest was shown, but I don't think we've heard from anyone actually using them, nor have we seen any real pix of them. I just got mine today, but I probably won't be installing them for a couple of months, so I can't tell you how they perform yet. But at least I can show you some pix.

Pic 1: 56cc combustion chambers, 1.94"/1.5" valves.

Pic 2: D-shaped exhaust ports, angled plug design, port from #4 exhaust(third from left) to EGR.

Pic 3: centerbolt valve cover design, raised valve cover rails for using stock valve covers, stock EGR port location(from #4).

The quality of these heads appears to be excellent! They're very nicely made--beautiful, right out of the box!!! They come with 3/8" rocker arm studs and guide plates for 5/16" pushrods. Mine have 1.25" single springs for up to .480 lift, but you can get them with 1.47" single springs for up to .540 lift or 1.46" dual springs for up to .600 lift.

I'm using these on my 305, but they could easily be used on a 350 with excellent results, too. So if you have a 305, and you wanna try them, but you hate to spend the money in case you eventually swap to a 350, no worries because you won't have to buy new heads again. Get them now for your 305, then use them on your 350 later.

So at this point... a big to Trick Flow and Summit! I'm looking forward to some excellent results with these heads.

'Shifter

iTrader: (2)

I'm all set to get a set of these myself, but don't want angle plugs....I didn't
know that they were.....

Did they come without the guide plates and screw in studs not installed?
I'll be using S/A rockers so don't need the guide plates....

LAFireboyd

iTrader: (3)

Guide plates and screw-in studs came with, but they were not installed.

Don 79 TA

i was going to get them, but didn't want to deal with adapting the head sensors or pushrod lengths

i went with the E heads as they are direct replacements and bigger valves

i honestly think both heads would be great for replacing the stock heads, not to mention lighter

dont forget antisieze everything

LAFireboyd

iTrader: (3)

A 1/2"(outside diameter)-to-3/8"(inside diameter) brass thread reducer will be needed to thread into the sensor holes because they're 1/2" instead of 3/8" like our stock sensors. Then just install the sensor into the adapter. Once it's all in place, you won't be able to tell the adapter is there. So no worries.

And yes, pushrod lengths will have to be measured.

thirdgen88

don't forget to put thread sealer on those rocker studs too...

robertfrank

iTrader: (27)

Tell us how well these heads work when you get them put on.these are the same heads I will be getting except for they'll be the one's good for a .600 lift.

Shagwell

- ANY head may need different pushrods, you should always check. Even stock heads on a stock block should be checked if you're not using stock head gaskets. Technically you need longer pushrods with a standard fel-pro gasket because it's thicker than the factory.
-for the adapters, simply 1/2 x 3/8 npt(pipe thread) bushings. As LAFireboyd said, hardly noticable, even with brass prices currently going through the roof you're talking $1.35 ea.
- bigger valves won't fit the bore size of a 305. 1.94/1.5 is all you get. -

There are a couple people on here running 12's, one or two shooting for 10's with all-motor, factory displacement 305's. - These heads should do wonders.

tpivette89

these heads look AWESOME! one of the best new products IMO for the smaller bore motors yet. ive wanted a set for my 87' IROC for a few months now.

any chance you can have them flowed to see if the Trickflow numbers hold true?

one other question... when i order these heads i will be using a cam with lift numbers of .565/.570. however, i will be using the new Comp beehive springs. i dont want to pay an extra $160 for the trickflows with their high lift springs if im not going to use them, but am worried that the cheaper versions (which accept only a .480" lift) will not include valve guide modifications etc to handle any extra lift beyond that. so anyway, when you get the high lift spring version, are there anything else done to the heads over the cheaper ones or are all you paying extra for is just the springs?

robertfrank

iTrader: (27)

I'm sure the heads will be cut for a higher lift,hence the more expensive price.

slayer2000

iTrader: (1)

tpivette89, I don't know for sure about these heads but I have tfs 195cc heads on my car. I replaced the springs for a higher lift cam and trick flows tech line told me all of those heads were machined to accept the highest lift and the only difference was the springs themselves. My guess is it's cheaper from a manufacturing standpoint to have one machining setup.

LAFireboyd

iTrader: (3)

These heads are basically replicas of Trick Flow's 195s. And looking at and measuring the width of the cut, it's apparent that the heads are already machined to accept wider, higher lift springs, like slayer's report on the 195s.

And judging by the size of the cut, if you tried to machine it any wider, it would interfere with the center mounting bolt between the two center exhaust springs(see the pix in the opening post). So that also leads me to believe they're already machined to accept wider springs.

I chose the 1.25" springs because I want to keep my stock valve covers. And the space between the wider springs just didn't look wide enough to allow the PCV and breather baffles to fit without interfering. Everything probably would have fit without issue, and I'm sure there are probably people out there who're using the wider springs with the stock valve covers without any problems. But it looked very close, and I didn't want to findout the worse after I had them.

There are higher lift 1.25" springs out there, so if/when I install a larger cam, I'll just stay with that size.

d4nk

iTrader: (2)

im in the process of installing a set of these with the 1.47 springs. So far the only problem I ran into was the coolant sensor... I just took one of em over to napa and they dug up a 1/2" pipe thread that fit perfectly instead of getting a reducer. Im also re-using the stock valve covers with the pcv valves and doesnt seem to be an issue.

_Twisted_

Did the OP ever post the after install results or a follow up post?

I have been looking at TF's, specifically te Duttweillers - however the latest Summit cat doesnt show them to be Duttweillers any longer from what I saw

LAFireboyd

iTrader: (3)

Nope, I didn't. They're still in the box.

The last year has been spent on land, new home project, prepping home for sale, as well as my job. So I'm afraid all car projects had to take a backseat. I haven't even taken my Formula out of the garage for over a year now.

So it's been a busy year, but a good one, and everything's almost finished, so I hope to be ready to begin playing with the car again in a couple of months.

Summit's website still shows them as Duttweilers:

http://store.summitracing.com/egnsea...115+4294784603

86redIROC

I have these heads and will have them on and the car on the road in a month. I am using them on a Jegs Blueprint 355. Was originally gonna use them on my LB9 305 until I got this 355 block. The 56cc chambers will yeild me 10.25 to 1 compression on the 355. Should be an excellent head.

I will report back when I get the car on the road.

Rob Wade

I have been running these heads since last spring on my 89 L98. Very happy. No issues aside from the afforementioned sensor holes. Machining and casting quality is very good. I am still using the stock cam w/ 1.6 rockers. Car makes good power and still has decent mileage. No complaints here.

Rob Wade

OK I am changing my tune. The motor is coming out as we speak. I had a small oil leak at the back of the intake so I was in the process of removing everything and I pulled the ps valve cover. As I am working away I look in the rear oil drainback hole in the head and there is something stuck in there. I pulled out a piece of a valve spring damper spring. Apparantly the reason for the economical price would be the quality of the components in the heads. Before you guys bash, its the stock L98 cam with 1.6 rockers which works out to around .460 lift and the springs are suppose to be good to .480, so thats not an issue. So the cost savings in these heads will be lost to a new set of springs, and head gaskets, along with the time to R&R the motor. Not real happy right now!