Need help with information for actual race vehicle

[CNCguy]

FWD heads with RWD pistons does increase the CR substantially. You can use the CR calculator to calculate the CR with the mix of parts. http://60degreev6.com/content.php/101-CR-Calc

Flanges for aluminum heads are available at WOT tech. http://wot-tech.com/shop/all/cat_35.html

[666Racing]

headersbyed.com has prefabbed flanges and header parts...

[sureshot007]

Tuning a big cam with MPFI is not easy and the long runners won't make high RPM power. The Edelbrock manifold sucks for high RPM power because 3 of the ports are half sized to boost torque (it can be welded and ported full size- a lot of work). A holley 500 cfm 2 barrel can be mounted on a modified carb manifold or a modified TBI manifold-no easy way out here either. 11:1 + compression with iron heads is not possible without custom dome-tops (GM used to offer forged 12:1 2.8L pistons but no more) The Chevrolet High Performance Bible says an iron head V6/60 is capable of 1.5HP per cubic inch - 173 x 1.5=259.5HP! I think you will need to figure out what RPM range the truck will see on the race course and cam and manifold accordingly. My combo (stock shortblock, holley 500 cfm on a TBI, huge cam) really wakes up at 3500rpm and pulls hard through 7200rpm.

I'm digesting all of this right now...

So, 2.8 rwd block + aluminum 3.1 fwd heads = ~11:1 compression
add a dash of big cam, a sprinkle of 2 barrel holley (why not 4?)
If the Edelbrock manifold sucks, is there a better alternative?

I can't thank you guys enough for helping us out with this info.

[666Racing]

...the Edelbrock will only fit iron heads...I tried running a stock Edelbroc with a 390cfm #8007 holley 4 barrel and a 600cfm #1850 holley 4 barrel. It ran just OK. My modified TBI manifold with the holley 2 barrel was more drivable on the street and made way more power on the track. I could not fit a 4 barrel on a TBI manifold. I don't know if a welded and ported Edelbroc will make more power? I am in a similar predicament as you. I want to use the 3100/3400/3500 series heads with a custom pro-stock style tunnel ram triple 2 barrel carb intake and distributerless ignition (for carb clearance) on a 3.4L S-10 replacement shortblock. Other than spending big $$$ on a custom Hogan or Wilson manifold I don't see any aftermarket pieces available. I am trying to use a GenII lower manifold as a base for a fabricated tunnel ram. Maybe the CNC guy could make just the side pieces and bottom for experimental applications?

[sureshot007]

So the stock intake on the 3100 heads won't work?

[666Racing]

The Edelbrock, stock carb intake and TBI intake only fit cast iron heads.

[sureshot007]

Can we get over 11:1 compression with the iron heads without doing a ton of work?

[666Racing]

I don't see a way to get 11:1 with iron heads without custom dome top pistons. The discontinued Chevy dome top 12:1 piston part #s are; 14044833std,
14044834+.5mm and 14044835+1mm. These pistons have been out of production for well over a decade but you never know if they can be found New Old Stock, swap meet, ebay, etc. If a big cut is made on the block deck and the heads you can mill your way to 11:1 but, the intake ports don't line up with the intake manifold ports and the valve cover flanges won't line up either! WTF??? it ain't easy! I'm running less than 9:1 with a big solid cam 248int@.050. Crower and Crane both advised against running such a long duration cam with low compression. I went from a hydraulic cam with 224int@.050 and 1.6 comp rockers that was a text-book perfect match to the current big solid cam and real roller rockers and made more power everywhere and less parts breakage. Go figure???

[sureshot007]

We don't need to keep stock, or even chevy pistons.