67_1600 Posted June 1, 2015 Report Share Posted June 1, 2015 I'm building an LZ2.3 stroker and am trying to decide which head to use. I found that my W58 head is a closed chambered head and also have a W53 head. The W53 has the smaller 33mm exhaust valves, but I was going to just pull the 35mm valves from the W58 and use them instead if I went that route. My setup is below - which would be best suited for my build? Block: L20b bored to 87.75mm Crank: Z24 Pistons: Z22E Cam: Ground to the equivalent of a CompCams 260 grind (260 duration, 0.42 lift). Fairly mild with an RPM range from 1k to 5k (perfect for my driving habits) My compression should come in somewhere between 9.6 and 9.7:1 based on the OZDat compression calculator. The majority of my driving will be between 2.5k and 4k and I'll rarely wind it up to even 5k. The W53 head has smaller intake ports but then there are the steel liners in the exhaust ports of the W58. Given my relatively low RPM range, would the smaller intake ports be more beneficial for me? Thanks in advance. Quote Link to comment
datzenmike Posted June 1, 2015 Report Share Posted June 1, 2015 Yes. Always go with the highest port air speed that does not choke off top end performance. Also remove the material around the shrouded valves. This is critical on a larger displacement larger bore engine. Quote Link to comment
scooter Posted June 1, 2015 Report Share Posted June 1, 2015 W58, or if u want to run open chambered, a u67. What mike said, I would still go with the biggest valve biggest port head you can get your hands on. One with 1 3/8 ports with the big stock valves would keep it a stump puller anyway. Quote Link to comment
Doctor510 Posted June 1, 2015 Report Share Posted June 1, 2015 Either will be OK, you decide whether you want Square W53 or Round W58 exhaust ports Quote Link to comment
hosestop@msn.com Posted June 1, 2015 Report Share Posted June 1, 2015 I always remove sleeves in round port head , quite a bitch with a extra sharp chisel and vise grips , seem to run good had L18 with crown turbo 20yrs ago. Quote Link to comment
67_1600 Posted June 1, 2015 Author Report Share Posted June 1, 2015 Thanks for the replies... I did consider removing the liners and had run across some threads describing the process, but Mike's recommendation (unless I interpreted it incorrectly) kind of confirmed what I was thinking - based on my build and RPM range I'll typically be running, the smaller ports of the W53 producing a higher air speed will be a better fit. Quote Link to comment
MicroMachinery Posted June 1, 2015 Report Share Posted June 1, 2015 What do you want for the w58? I have use for such a part.. Quote Link to comment
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