BlackBird92

Hi guys,

I still have a cam swap (Crane 2031 Powermax) to do and since I am not really satisfied with my ported heads and reworked intake manifold, I think about swapping S/R Torquer 305s (pn#42750-1) and an Edelbrock Performer TBI in to better match the cam.

The heads are for 87 and later model sbc with centerbolt holes only. My questions concerning the heads are:

Can I use the stock temp sensor?

Are these heads still a bolt-on when using the supplied springs/valves? World says they have an installed height of 1.8". The stock valve springs' installed height should be 1.7". Do I have to check rocker geometry? World says I can use stock pushrods.

Do the stock centerbolt rocker arm covers fit on the heads with centerbolt holes only? In some posts I have read, that they will not fit. But the people in these posts were using the heads for centerbolts _and perimeter bolts that I do not intend to use.
If stock centerbolt covers do not fit, what do I have to alter/change to make them fit?

Does anybody here have experience (good or bad) bolting these heads (pn# 42750-1) to a 1992 305?

My question concerning the Edelbrock Performer TBI:

I have a 14x3 drop-base open element installed. The Performer intake is 0.25" taller than stock.

Do I still have enough hood clearance with a stock hood?

Thank you!

Later,

Andreas

jimjohn

I used the S/R heads on my 305 with the Edelbrock Intake with no problems.
The only problem I had was with the valve covers. The heads are equipped for both the center-bolt and perimeter bolt covers. They have a drilled and tapped boss for the perimeter covers which interferes with the c/b covers. The c/b covers have a lip on iach side of the gasket, the inner lip hits the perimeter cover boss and keeps the covers from seating. World suggester grinding the perimeter boss down to allow clearance but the heads were already on so I ground the inner lip in the area of the boss and used a little silicon. Worked for me. the temp sensor should work without problem.

iroc22

The ones with the centerbolt only ones will bolt up to the stock valve covers flawlessly without modification.

Actually everything bolts up flawlessy.

Except you need to get an adaptor for the head temp sensor, no biggie.

The .25" wont make enough of a difference to notice. Have you ever considered going with a Performer 4bbl manifold with a TBI adaptor? You'll see more top end with that route and its a lot cheaper.

JR305

Where would you get this adapter for the temp sensor?

wasp

i also have that amnifold altho ill be getting rid of it, however to answer your question... yes........i have the intake, a 1/2" spacer under tb and an injector spacer with a 1/2' dropped air cleaner, hood closes no prob......its a 91 bird but im sure its the same deal

RICH92RS350

I'm using the Edelbrock Performer TBI with a Flat Bottom 14x3" Air Cleaner (Moroso #65911),
No Spacer and it clears the hood of my 92 RS just fine.
-Rich-

iroc22

Its just a standard brass adaptor/fitting. I cant remember the exact size.

BlackBird92

Thank you for your replies.

@jimjohn: Thanks, this is what I wanted to know concerning the centerbolt covers in case they do not fit.

@iroc22: Concerning the center bolt valve covers, the supplied valves and springs (installed height) going with the #42750-1 heads, this is what I hoped to hear.
Who makes this temp sensor adapter? Do you have a manufacturer and a part number?
I am glad to hear that .25" does not make a difference in hood clearance.
I have never considered a 4bbl Performer since my highest rpm is considered 5500. Will a 4bbl Performer make a difference in power/torque in an rpm range from 1500 to 5500 compared to the Performer TBI?
I assume you are suggesting the Performer #3706? What kind of adapter do you suggest?
The #3706 is Euro 70.- less than the Performer TBI. If the adapter is within a Euro 20-40 range it would be worth considering a Performer 4bbl/adapter combination.
Please tell me more about it.

@wasp: Thanks I think a '91 should be the same as a '92. If your hood does close with a .50" spacer under your TBI and an Edelbrock Performer TBI installed, mine should do fine.

Later,

Andreas

BlackBird92

@rich92rs350: This is a very useful information. It seems that I can dare to try a non-drop base air cleaner. Thank you!

@iroc22: You mean a standard brass fitting which one can get at a plumbing store?

Later,

Andreas

JokerRS

The stock temp senser is 3/8 npt pipe thread. The hole in the S/R torquer head is 1/2 npt pipe thread, you just need a 1/2 to 3/8 pipe reducer.

iroc22

There's your answer and yes it's one that you can pick up from the plumbling store.

Basically the 4bbl manifold will give you more plenum volume and in turn more power up top. You wont lose that much on the bottom because fuel injection has a broad powerband. Ideally the best route is a single plane intake, but that has a hard time fitting under the hood and it wont have an EGR option.

Unfortunately there isnt an adaptor on the market (that I know of) that is the small bore stock TBI size. So it would have to be some sort of custom setup.

TBI305Camaro

youll have to get a custom chip when you swap all that out or i hear it wont run right...im thinking about going with the same setup but i might switch to carb i still dont know depends on how money treats me this summer

iroc22

I've been driving my car for about 3 weeks now with my combo and it drives fine.

BlackBird92

I feel that mine will run fine, too. Nitroburn has the Crane 2031 Powermax Cam in his engine and it runs great with a stock chip. I really can't imagine that adding heads and an intake to that cam will make such a big difference to the chip.
I will give it a try and check everything with winaldl as soon as I get it finished.
If there would be a need for a custom chip I will have to get into diy prom burning and do this.

I will try to find an adapter for the stock size throttle bore. I will check the TOTW.

Thanks for all your replies.

Later,

Andreas