steve from staten island
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Ive been following threads about compression ratios, CC combustion chambers and such and I wanted to get some advice
So I have a 69 383 engine in my car. The heads are from a stock 2 barrel single exhaust 383
They were redone with hardened ex seats, I think some or all new valves, just a basic stock head.
The short block was bored 30 over, decked and balanced, rods were checked and all good bearings and parts
The pistons are Speed pro L-2315 flat top with no valve reliefs
CAm is Comp cam part # 21-223-4. lift .477intake. exhaust .480.
duration 224 intake 230 exhaust
I have a Weiand dual plane manifold and Edlebrook 650 carb and factory HI po exhaust manifolds
I have a stock distributor recurved and rebuilt by our own Ray Halifax
The engine develops 14 to maybe 15 inches vacuum. The needle on gage vibrates slightly
The idle could be better but has no hesitation.
It was pinging and I have about 32 degrees total advance
Since I converted it over to a 4 speed I haven't heard any pinging
Car has a 3:55 sure grip
Compression is if I recall around 180- 190
My question is about the heads. Are there heads reducing HP and would it be advisable to change the heads
While im not racing this car, the performance with the 727 ( stock) was a little disappointing.
Any thoughts are appreciated
So I have a 69 383 engine in my car. The heads are from a stock 2 barrel single exhaust 383
They were redone with hardened ex seats, I think some or all new valves, just a basic stock head.
The short block was bored 30 over, decked and balanced, rods were checked and all good bearings and parts
The pistons are Speed pro L-2315 flat top with no valve reliefs
CAm is Comp cam part # 21-223-4. lift .477intake. exhaust .480.
duration 224 intake 230 exhaust
I have a Weiand dual plane manifold and Edlebrook 650 carb and factory HI po exhaust manifolds
I have a stock distributor recurved and rebuilt by our own Ray Halifax
The engine develops 14 to maybe 15 inches vacuum. The needle on gage vibrates slightly
The idle could be better but has no hesitation.
It was pinging and I have about 32 degrees total advance
Since I converted it over to a 4 speed I haven't heard any pinging
Car has a 3:55 sure grip
Compression is if I recall around 180- 190
My question is about the heads. Are there heads reducing HP and would it be advisable to change the heads
While im not racing this car, the performance with the 727 ( stock) was a little disappointing.
Any thoughts are appreciated