Guest Your Car is Slow Posted March 20, 2003 Share Posted March 20, 2003 So since the exhaust ports on an LT1 are Dshaped...and most hugger headers come with round exhaust ports....there will be some conflict there. Anyone ever mount some of these headers to an LT1? did you "massage" the LT1 exhaust ports to get them to fit? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 20, 2003 Share Posted March 20, 2003 Round type will work just fine. I have hooker block huggers on my lt-1. No leaks, clears everything but the knock sensor. Just moved it. Mark Quote Link to comment Share on other sites More sharing options...
Guest Your Car is Slow Posted March 20, 2003 Share Posted March 20, 2003 interesting...I assumed they would bolt up...I was just concerned as to what the port matching would look like with the round hole mating up with a D shaped hole. Perhaps Ill bust out the dremel and make the D hole a round hole Quote Link to comment Share on other sites More sharing options...
Mike C Posted March 21, 2003 Share Posted March 21, 2003 I put a Felpro small race gasket on my LT1 equpped with CNC Heads ported heads to check where the ports were in relation to the gasket, then put the gasket on my shorty headers. The alignment looks excellent, with the round port being larger than the d-port on the heads. With the shorty's short primary tubes my hopes are this will also function as an anti-reversion dam. Don't monkey with the exhaust port. The d ports have excellent flow characteristics, and as long as no part of the header blocks any of the head port, you will be fine. Vizard even suggests slightly larger tubes than port because of the AR effect. Quote Link to comment Share on other sites More sharing options...
Mudge Posted March 21, 2003 Share Posted March 21, 2003 Exaust ports are small, a 1 5/8" or larger header will easily be larger than the exaust port, there is no massaging needed at all. In fact you really dont want to TOUCH the exaust ports, there is no gasket matching etc, it would be a mistake to do so. On my ported heads I made 411 RW and did nothing to the exaust outlet, any porting needs to be done in the bowl/chamber etc unless it was an ALL out high RPM racer, in which case you wouldn't be using stock LT1 castings anyway The only issue I can see is making sure the gasket has enough beef to not blow out or let the exaust leak, but hey, copper RTV is great! Quote Link to comment Share on other sites More sharing options...
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