ycgoat

They are Duralast the top pic is left side bottom is right side

the450r

iTrader: (1)

No AC yet. Planning on using a vintage air Chevelle kit with a serpentine sanden compressor mounted high on passenger side. With Kwik performance compressor mounts. Similar to these pics

Toddoky

Got it. I assumed that you flipped your stock frame stands around for low-mount A/C compressor clearance, but your A/C mounting choice dispels that.

the450r

iTrader: (1)

They are flipped to use the existing Chevrolet mounting holes in the frame. This moves the engine back right to the firewall. And allows the f body pan to drop behind the crossmember. And positions the f body alternator behind the steering gear. Some of the earlier swap mounts required grinding on the steering gear and f body alternator mount to clear. The pulley would rub on the steering gear and the rag joint would rub on the alternator mount.

I installed a different Intermediate shaft with borgeson u joints and a collapsible shaft to gain extra clearance on the edelbrock headers I originally used because the I-shaft rubbed the number one headers pipe on the header tag. It also provides more precise steering feel.

I cut the floor for the t56 and raised the tunnel about 2". I also smoothed the firewall. For the vintage air setup. Some of these swap parts will put the passenger head into the HVAC case on an original air car. Usually the heater cases fit but are close.

Toddoky

That is some very good comparative information that will come in handy for someone. By your description, I would take a guess that your fore/aft engine position is very close to what is obtained using the rear-bias Hooker engine brackets. With those brackets, the 4th-gen F-body alternator slips nicely behind and next to the steering box and the right side cylinder head is positioned much closer to the firewall, as shown in these two photos:





There's approximately 1-3/4" of clearance between the sump of the Holley 302-2 oil pan and the engine K-member at this position, which leaves plenty of room for the engine to be moved forward for installation using the forward-bias Hooker engine brackets. If someone is wanting to do a swap that involves keeping the factory A/C evaporator case intact, use of the forward-bias mounting brackets will accommodate that desire.

the450r

iTrader: (1)

Amazing what you can learn from others mistakes. I have pics of my alternator and head clearance I can post. I think I still have pics of how others modified the alternator and power steering. The fbody accessories are the best option for the A-body swap. I know holley makes some pretty cool and decent priced accessory mounts. My buddy is using a r4 compressor on a ls3 in a c4 corvette.
Have you done any test fitting of factory or holley accessory mounts?

Toddoky

Sure, I've tested the fitment of the factory FEAD's from the truck, F-body/GTO including the A/C compressors/brackets.

I've also validated the fitment of the Holley accessory drive set-up at all three offsets (Corvette F-body and truck), which means the stock Corvette FEAD would also work. The 4th-gen accessories are a good match for the A-body, as long as you are using a rear-biased engine position and you are not trying to install a 4L60-4L70, 4L80/4L85 or T56 trans without having to cut the floor while achieving optimized U-joint working angles.

You can install a TH350, TH400 or 2004R at the rear-biased engine position without cutting the floor, the engine and transmission have to be forward-biased If you are going to install any of the modern transmissions and don't want to cut the floor. Once you move the engine/trans forward, the 4th-gen F-body FEAD is only an option if you relocate the alternator and PS pump with a kit such as the Holley system. The Holley or Corvette systems fit like a dream at either fore/aft position and the truck FEAD can be used by simply swapping out the PS pump pulley for one that is less than 6" overall diameter.

Here's a couple of pics for you that depict the clearances described...

smosley

Todd is there an update on when we can expect to order the transmission x-member? For other readers, the A position engine mounts seem to be on a pretty bad backorder. I've got everything but these two items, once received I can mock-up my 1969 442 chassis with 6.0l and 4L80e.

Toddoky

I'll dig into the ETA of the next production run of the engine brackets tomorrow. The crossmember is live on the Holley website now and available to be ordered.

smosley

Got it ordered and looks like it should be available around 1st week of April. Thank you Sir.

1989GTA

I will wait and see what you do with the 64-67 crossmember before I place an order.

Toddoky

I can tell you that the general appearance of the 64-67 crossmember will be the same as the 68-72 crossmember, but there will be elevation differences in its design to account for the floor height/shape differences between the cars.

watevadunno

Hey tod
Was wondering if either mounting position of the Holley mounts would allow me to use my original tail shaft if im also using my original th350.

Toddoky

I'm assuming you mean driveshaft and not tailshaft. The rear-biased Hooker engine brackets (71221007HKR) place the engine/trans mating plane in the stock location with a extra 1/8" bump rearward for providing clearance between the steering box and a 4th-gen F-body alternator. With that being the case, it's highly likely that your stock driveshaft would work, but you would need to install it and verify that the transmission yoke has enough slip length to ensure it won't bottom-out. That would tell you if it's usable in the mechanical sense, but I would be cautious of calling it sufficient from a structural standpoint, since it's probably 2.5" in diameter with 1310 U-joints in it.

the450r

iTrader: (1)

heres some pics of mine and at the end some modified steering gear. the pic with the rag joint gives you an idea where it could rub on the alternator.

Mdavid

I was looking at a ls 427 crate engine and noticed they use the Holley 302-1 instead of the 302-2 pan. all of your comments are centered around the 302-2 (F body pan). Will the engine mounts, headers, crossmember also work with the 302-1? if not, will the 302-2 accept the same stroke as the 302-1 so I can still get to 427 cu in?

Toddoky

The only Holley pan compatible with this application is the 302-2; the 302-1 is not capable of providing the needed clearance or installed eng/trans inclination angle. The 302-2 can be modified to be stroker compatible by anyone with fabrication and aluminum welding skills.

ycgoat

Any feed back about that G-Force Convertible/boxed frame cross member for a 4l80e with these mounts and headers?

69 Custom S Vert

My project stalled until I get my 302-2 pan back from my fabricator who is modifying it to accommodate my 408 stroker. The aluminum welding is beyond my capabilities. Hoping to get it back this week and start test fitting.

In any event, I was watching an episode of a carfix LS3/T56 swap wherein they used a "nutsert" tool to insert nuts into the side of a boxed frame to attach the tranny crossmember. Keeping this in mind as a backup plan. Anyone have any experience with "nutserts?"

69 Custom S Vert

ycgoat, would you post a picture of the weld-in tabs that come with your aftermarket crossmember? I'd like to look at them. Thx.