4.5/4.9 Cadillac V8

[RallyTime38]

Roverman,

Are those cam blanks for a Cadillac?

[mgb260]

Roverman has Rover blanks but, that is what you need for Fred's suggestion. Delta Cams may be able to modify and swap around the distributor gear if you send them the blank with a Caddy stock cam. They do a high performance regrind for the Caddy cam based on the Ford E cam specs for the Fiero guys.

[roverman]

Just so I understand, why 215 heads on a cast iron caddy block ? Anyone put an RV8 in a Fiero ?

[mgb260]

Art, 4.9 has aluminum block with iron heads.

[roverman]

Ok, so why 215 heads on an aluminum caddy block ?

[mgb260]

Art, To get rid of the iron heads! To make the motor even lighter.

[DiDueColpi]

So after seeing the caddy block naked, I see the issues. Relocating that row of studs is doable, sealing the head is problematic.
I think that even that spray on seal that makes your screen boat float won't save us.
However, the fix for the Lover engine can save the day!
Pull the cyls. and deck the block 0.500 thou. Machine a new deck from aluminum plate and sandwich it between the block and the Rover head. The inside studs line up so everyone can play nice there. The outer studs present a few more options. I would move the studs to line up with the rover head. Or you could countersink the caddy stud into the deck plate and drill the plate for the rover pattern. You could also weld the plate to the block but a failure would be disappointing. They all give the opportunity to utilize the American 6 bolt pattern if you wanted that. The other option that presents itself is drydecking the block by utilizing the deck plate to stop the wet cyls from walking around and meeting the neighbors.
Machine the inside edge of the decks to accommodate a sheet metal plate to seal up the valley and you are good to go.
There's more stuff but the leader of the opposition just poured me a scotchy scotch. so she's purchased something!
Cheers
Fred

[BlownMGB-V8]

Maybe you could run studs or long countersunk capscrews from that plate down into the main web to tie it all together and stabilize the liners and tie the heads down. Maybe external ribs/bolt bosses heilarced to the outside of the block could be used to do the same thing though and eliminate the plate.

Jim

[mgb260]

I Like the idea of the deck plate surrounding the liners. Kind of like a girdle on the top of the block. The intake side bolts are long and go down to the main web. The outer countersunk bolts would too. The outer head studs would be attached to the 1/2" deck plate. With a valley cover and spacers any Buick/Rover intake would work. Maybe a 300 intake would fit better?

[roverman]

Yea,yea, kinda like you would deck plate an RV8 for Lotus heads ? Why is a cad block so superior to an RV8 block,
   it warrants all this work ?  Forged crank, stronger, sustain more hp. ?

[MGBV8]

It's what they had.  

[mgb260]

https://www.youtube.com/watch?v=nvGUamjFrjA

[BlownMGB-V8]

A set of TA heads on that block should work rather well I would think.

Jim

[MGBV8]

Even Buick 300 heads would be better than the 215 heads.

[Roverbeam]

He mentioned a "hot vee" setup - suggesting maybe the heads fit on backwards? intake from the sides, exhaust up and out the middle? I'd love to see what that looks like!

edit: I can't see how a reversed head could work, but just because it looks so fun here's an engine with a side-fed ITB set up with top exhaust.

[MGBV8]

Nope.  He mentioned the valve cover sealing over part of the intake.

[ag1234]

I hereby rename "hot vee", Indy Jones. Parnelli not needed. Might be tight in a "B" ? Let's get serious. 7" shorter ? Forged crank ? Cader V16 ?                                                           Onward,   Art.

[ag1234]

I have 8620 billet, round lobe cam blanks, 4.0L up RV8. Bearing journals are +.03" os. Perhaps will machine to fit Cad 4.9L.


 If anyone has these two dimensions, please ?

       I f anyone has these two dimensions please ?   Thanks,   Art.                                                                                                                                                                                                                                  














                                                                                                Art.

[mgb260]

Miata Lemons car build with some performance tips:

https://forums.24hoursoflemons.com/viewtopic.php?id=35746

[mgb260]

Pic of 88-89 4.5 dual plane intake to be used with 4.1 or 4.5 valve covers and 4 barrel conversion:

[mgb260]

85-87 single plane intake:

[ag1234]

Perhaps this helps explain the "weird" center intake ports on each side ? Runner length vs velocity, with  a single plane ?  I want to install an Eaton M112. I suspect a modded single plane will work better, Jim ?

[mgb260]

This guy used a M90:

https://www.fiero.nl/forum/Forum2/HTML/127611.html

Another:

https://www.fiero.nl/forum/Forum2/HTML/125735.html

[mgb260]

The single plane small throttle bores for the early 4.5 are a carryover from the 4.1. Probably same intake. Need to be bored bigger. The dual plane on later 4.5 and 4.9 are much larger.

[mgb260]

Art, The Allante lower intake would be best for a Supercharger.  Will only work with 90 4.5 PFI or 4.9 heads.