critique my combo...
critique my combo... 1981 Corvette M4 with 3.73 rear end gears.
355ci L82 short block (Gen 1 with flat top pistons and valve reliefs).
Lunati hydraulic flat tappet 230/230 duration (@.050) .480/.480 Lift (w/1.5 rockers) on a 109LSA.
Ported and Polished World industries "s/r torquer 305 heads" with 1.94/1.50 valves and 58cc chambers (de-shrouded, polished), dual valve springs.
lightly ported and polished Edlebrock Performer RPM square bore intake and Edlebrock 650cfm square bore carburetor.
Also have 1 7/8 Hooker Super Comp Side Pipes.
355ci L82 short block (Gen 1 with flat top pistons and valve reliefs).
Lunati hydraulic flat tappet 230/230 duration (@.050) .480/.480 Lift (w/1.5 rockers) on a 109LSA.
Ported and Polished World industries "s/r torquer 305 heads" with 1.94/1.50 valves and 58cc chambers (de-shrouded, polished), dual valve springs.
lightly ported and polished Edlebrock Performer RPM square bore intake and Edlebrock 650cfm square bore carburetor.
Also have 1 7/8 Hooker Super Comp Side Pipes.
Last edited by 3rdCoastPowerSports; Jul 8, 2013 at 07:37 PM.
Heads are a little small and headers are a little big. You won't see a lot of high rpm power but it will run pretty good. Gonna be kind of tight on running pump gas with that combo. You would be better off with a 64cc head. The aluminum fast burns with 2.00 and 1.55 exh would be perfect for your engine imo
TECH Regular
Joined: Apr 2011
Posts: 441
Likes: 0
From: Deep in the heart of Texas
Small bore heads {283, 305} on a 4.000+ bore block is considered taboo by a lot of builders but have been done a lot to bump compression back in the day with use of 4.000+ head gaskets.
Stock your S/R heads flow about the same as 462 style, double hump heads. Ported and polished they probably flow about the same as Vortec heads. That being said, I'd estimate your horsepower 375 to 395 at the crank and 420 or so torque. Which translates to 325hp 360tq or so at the wheels. Couple that with the 4 speed and 3.73's your Vette should pull strong. Are you leaving horsepower on the table? Yes
I'd shitcan the oldschool cam for a new school split duration/ lift roller cam roller lifters and some better breathing 64cc 195's or 205's. Should be good for 50 or 60 more horsepower and equal torque gain.
Stock your S/R heads flow about the same as 462 style, double hump heads. Ported and polished they probably flow about the same as Vortec heads. That being said, I'd estimate your horsepower 375 to 395 at the crank and 420 or so torque. Which translates to 325hp 360tq or so at the wheels. Couple that with the 4 speed and 3.73's your Vette should pull strong. Are you leaving horsepower on the table? Yes
I'd shitcan the oldschool cam for a new school split duration/ lift roller cam roller lifters and some better breathing 64cc 195's or 205's. Should be good for 50 or 60 more horsepower and equal torque gain.
On The Tree
Joined: Mar 2009
Posts: 124
Likes: 0
From: Central NJ
Stock your S/R heads flow about the same as 462 style, double hump heads. Ported and polished they probably flow about the same as Vortec heads. That being said, I'd estimate your horsepower 375 to 395 at the crank and 420 or so torque. Which translates to 325hp 360tq or so at the wheels. Couple that with the 4 speed and 3.73's your Vette should pull strong. Are you leaving horsepower on the table? Yes
I'd shitcan the oldschool cam for a new school split duration/ lift roller cam roller lifters and some better breathing 64cc 195's or 205's. Should be good for 50 or 60 more horsepower and equal torque gain.
I'd shitcan the oldschool cam for a new school split duration/ lift roller cam roller lifters and some better breathing 64cc 195's or 205's. Should be good for 50 or 60 more horsepower and equal torque gain.
A roller cam is the best bet to more usable power - the increase in lift while having a shorter duration is awesome for power and driveability, I have a much smaller roller cam in my Camaro (219/219 .560/.560) with a set of ported L98 Vette heads it makes 400hp at 5600 and 425lb-ft at 3800. The heads have small ports and high flow (relatively) and make a lot of TQ for a 350...
