I am removing the 305, 5.0 from my 1980 Corvette. I am installing a beefed up 350, with 400 hp. Can any one suggest the best type of headers for this application. I am also interested in other advice on what type of performance parts will best work with this new motor. Here is what the new motor contains: 350 Chevy with 400 hp. block is a 1-piece seal 4-bolt main block with a fuel pump provision to run stock type mechanical pump its bored .030 and honed with TQ plates, has .030 Federal Mogul (trw) forged pistons part# L2256 and the valve pockets are cut where they are supposed to be to make them bigger for larger valves. Rods are X series GM rods that have been cleaned, magnafluxed, and given an extra shot peening, crank is a cast 1-piece seal version cut .010/.010, all was balanced. Rings- Speed Pro file fit plasma's, bearings are King HP series, Camshaft is custom from Bullet cams and is as follows: HYD. ROLLER. intake is .481 lift 224 @ .050 276 deg adv.-- ehx is .490 lift 232 @.050 284 adv. duration . l/s is 110.....heads are GM vortecs with 1.94 int and 1.60 exh.3 angle Vj and surfaced. guides cut for large lift cams and NEW 110lbs springs were added. New head bolts were used. Lifters are GM units that are modified with different springs to make them run better at higher RPMs but still operate quietly for the street. Oil pan is GM from an lt-1 motor and has windage tray and studs installed. 8" balancer will be installed. INTAKE MANIFOLD is a PERFORMER RPM, powder coated silver :auto:


[Modified by peparker, 5:36 PM 1/11/2004]

 

Sounds good to replace that 305.
Dynomax Cerma Coat headers & a higher stall converter. Intake fit may be too tight w/ 80 hood.

 

Another "California" car bites the dust! :) Looks like a big improvement is in store under the hood.

You might search the archives for threads on headers and coated headers. There should be plenty of opinions there.

As to other performance parts, choice of transmission, gearing, etc will all have an impact. You might call Van Steel (Corvette Forum Sponsor) and describe your objectives. They should be able to give you some options as to suspension, brakes, and drivetrain modifications (if any) you are going to need.

 

Thanks for the advice on the headers.
Do you think I will need to change the hood in order to use the Performer RPM intake? Sounds like I should reconsider the intake manifold.
Thanks again. :cheers:

 

Hi,

That's a great setup for a street engine. I run the same engine minus the cam, mine is the Comp cam roller XR-270, and I love that engine. I'm planning headers this spring and I'll go with the Dynomax Ceramic coated.

As for the intake, I run the Edelbrock Performer, not the RPM, and my stock air cleaner did fit under the stock hood....with a little help. If you want to run the RPM, you'll have to change the air cleaner for one with a dropped base.

For other performance mods, a 2500 stall and a 3.55 rear gear are following after the exhaust. I am currently running around 13.50 at the 1/4 miles and I'm pretty sure to break in the 12' after the listed mods.

Stephan