Good Afternoon: New to the Forum and new to a Firebird. Just purchased a 67 400. Green w/ Black Vinyl top. I'm wondering if anyone has or has seen this type of engine build before.
Engine is a 400 (code on the block is WT (not original block to the car) ) Heads are 18 Code (believe from a 350HO (68cc)) Intake is a Edelbrock (says Torquer Pontiac on it) Carb is a 650 Holley Spread Bore Cam is a Crane (Blazer 288-2H Grind) Intake Open 30 Closes 78 Exhaust open 84, Closes 36 Lift Intake @ Cam 300 Lift Exhaust @ Cam 310.
I do not know what pistons are in the car (haven't borescoped yet) though I'm thinking they are pretty deep dished with 68CC heads as previous owner ran it on Pump gas for over 10years. Yes I know. I was like "What! No. That wasn't a good idea". It's now drinking premium. Engine sounds good. Runs a little rich. And it likes to drink gas.
Runs to me a little warm (it was a warm day yesterday about 82F and cruising on the highway sitting around 200F sneaking towards 210 when stopped). (Recently ordered Firebird Radiator Upper Baffle Support Top Cover Filler Panels so that should help put a little more air through the Rad)) and will in due course take the water pump off and confirm the gap between the vanes and housing. Under load on those conditions could hear what I think is some intial light knocking but not sure. Overall it feels alright but I'm thinking it isn't putting out the Torque I thought a 400 pontiac would put out. I'll have a chance next week to drive a friends 69 Grand Prix with a factory 400 in it for comparison.
