[mikeb44]

I have a BBC 454 that i just had the bottom end rebuilt with forged 10.1 compression, domed pistons bored .30 over, and came a across a set of edelbrock semi open chamber aluminum 100cc heads.

My question is will these heads that i bought mess with my compression alot? im wanting to make sure that i can run it on pump gas, supreme obviously, the motor is going in a 71 monte carlo street strip car.

 

[mr 4 speed]

how tall are the domes? is there a part # on them?
If the pistons aren't TRW Speed Pro/part # 2399 (.095 domes) or flat tops they (the heads) won't work.

 

[mikeb44]

I'll have to check the number on them but why won't they work? I know there Keith black

 

[GuysMonteSS]

The shape of the dome will play a big part in weather or not they will fit.The # 2399's are designed to work with a closed chamber head,most other dome pistons are made to work with an open chamber head,so you may run into an interference problem between the domes and the combustion chamber.Those heads will also affect your compression ratio,but I'm not sure off hand how much,depends on your current heads.
Guy

 

[mikeb44]

Ok, the stock heads are the oval port open camber 14081045 BBC stock heads, and I put the heads on the block and the seated fine and I didn't put the head gasket on, but it bumps it up the 11.1 compression can I still run it on pump gas?

 

[mr 4 speed]

Ok, the stock heads are the oval port open camber 14081045 BBC stock heads, and I put the heads on the block and the seated fine and I didn't put the head gasket on, but it bumps it up the 11.1 compression can I still run it on pump gas?

probably not. What cam?
You still need to know what specific pistons you have.
Also,once that is confirmed you might want to check with Edelbrock's tech line if your pistons are compatible with their heads.

 

[mikeb44]

I was gonna go with a comp xe284h cam and I found out that the piston are FHR IC9919, -18.3c, cc solid dome and the rod length is 6.135

 

[mikeb44]

Oh ya, the guy I bought the heads from was using them in the same motor
But with .40 over and the exact same 10.1 pistons just his dome was a tiny bit shorter

 

[rustbucket79]

You'd be in the 10.7:1 range with an undecked block/composite head gasket. (with Edelbrock 100cc heads) With the 284 cam and premium pump gas/proper tuning and a mild torque converter you should be safe at that compression ratio. You'll need to confirm sufficient piston to head clearance (and valve to piston) but otherwise it sounds like a decent combo.

 

[mikeb44]

Ok ya I'll the check piston to valve clearance, and thank you again for the help! I appreciate it.

 

[rustbucket79]

Don't forget to check piston to head, as simple as putting one head on at a time w/o a head gasket and turning the crank a few turns. No contact and you're good to go with a .040" min head gasket.