[Lloyd-TX]

Originally Posted by goathead455

Unfortunately my GTO engine is tired, and has an 041 cam in it, so not a good comparison. My Formula engine is a 10:1 deal with a SMALL solid flat tappet cam, and it averages 215 PSI cranking!


Lloyd,
How did you get to 10:1 on your Formula?
Did you mill the heads or do you have domed pistons?

Thanks

Both, actually.

You'll have to forgive me, as my memory isn't the best and we built this engine over five years back, but IIRC the chambers ended up at around 105-107 cc, and we had JE make us a custom piston with a SMALL dome of approximately 10cc volume.

Actual calculated static CR is 9.98:1. 467" (455 with a 4.200" bore and stock 4.210" stroke), 430 CBHP @ 5100 and 530 CBTQ @ 2900 on 93 octane pump unleaded.

Looks (and sounds - except for the solid lifter music) like a stone stock HO under the hood, manifolds and all.

[goathead455]

Originally Posted by Lloyd-TX

Both, actually.

You'll have to forgive me, as my memory isn't the best and we built this engine over five years back, but IIRC the chambers ended up at around 105-107 cc, and we had JE make us a custom piston with a SMALL dome of approximately 10cc volume.

Actual calculated static CR is 9.98:1. 467" (455 with a 4.200" bore and stock 4.210" stroke), 430 CBHP @ 5100 and 530 CBTQ @ 2900 on 93 octane pump unleaded.

Looks (and sounds - except for the solid lifter music) like a stone stock HO under the hood, manifolds and all.

Thanks Lloyd,
I was curious because my engine was originally put together almost 20 years ago and it has TRW domes in it.
Had it on the chassis dyno last fall 380 HP @ 4900 480 lbs ft @ 3400
running very lean.
I didn't have any jets with me to correct it at that time.
I will be making another trip to the dyno this spring hoping for some better numbers.

Thanks

[Lloyd-TX]

Originally Posted by goathead455

Thanks Lloyd,
I was curious because my engine was originally put together almost 20 years ago and it has TRW domes in it.
Had it on the chassis dyno last fall 380 HP @ 4900 480 lbs ft @ 3400
running very lean.
I didn't have any jets with me to correct it at that time.
I will be making another trip to the dyno this spring hoping for some better numbers.

Thanks

Your engine is making a BUNCH more than mine, as the numbers I posted for my engine were from engine dyno pulls.

Running through a single (non-PYPES) crossflow muffler mine only made 299 CBHP @ 5300 on a Mustang chassis dyno. We couldn't get a decent torque number on mine on the chassis dyno runs.

I didn't have an O2 sensor hooked up for my chassis dyno runs, so I have no idea if it was running lean, fat or what, LOL!

[bossbirdta]

last night i took the drivers side door panel off my 71 T/A and found this sign sitting inside the door. not sure how long its been there but it's an older sign with a nice patina. the last sticker on the plate is 1984 so i'm thinking its from back in the day. should i try to call and see if anyone has any info????