going bigger valves on 243's
going bigger valves on 243's If i go bigger valves on my 243's (right now i have 241s) I know I have to have the valve seats cut...but do I need to do anythign to my spring seats or anything else on the valvetrain?
different pushrod length? etc....
thanks in advance
different pushrod length? etc....
thanks in advance
Originally Posted by brad8266
Just valve seats. Keep in mind that bigger valves will reduce PTV clearance too.
I was gonna do 2.02 and 1.56 w/a 224 cam
that should be plenty of clearance right?
Originally Posted by dubrado
I was gonna do 2.02 and 1.56 w/a 224 cam
that should be plenty of clearance right?
that should be plenty of clearance right?
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Launching!
Joined: Jan 2003
Posts: 228
Likes: 0
From: Saginaw, MI
Those should actually fit on the stock seats, youll just have to get them cut to the bigger size. Shouldnt have any issues as long as youre using a good valvespring.
Not sure the valvespring would matter because of the vavle size? Lift on cam and rpm would matter.
It doesn't do crap unless the seat is opened up and blended into the bowl of the port.
Originally Posted by brad8266
Just valve seats. Keep in mind that bigger valves will reduce PTV clearance too.
Originally Posted by DJ_951
IF??? They fit the stock opening whats to blend?
Aftermarket valves with a thick margin (like the Manley valves) are going to reduce clearance. You'll notice a large reduction from a manley VS. stock even for the stock 2.00" valve. Increasing the diameter of the valve will only further decrease clearance. I guess it was too expensive to have valve reliefs cut in our pistons when they were being cast since we had 15 degree heads. Hmmmm...
Ben T.
Originally Posted by DJ_951
Thanks for the answer.
back up question: If you leave the heads stock and just change vavle sizes 2.02/1.57 would it be an improvement or just if you have the heads port and polished-cnc'ed.
back up question: If you leave the heads stock and just change vavle sizes 2.02/1.57 would it be an improvement or just if you have the heads port and polished-cnc'ed.
Originally Posted by Xtnct00WS6
There's a minimal gain and in my opinion, it's not worth the drastic reduction in PTV clearance.
I totally agree with the limited gains. With the good results coming in from all the stock valved ls6 heads out there, its hard to justify the cost when budget is a concern.
